tools/intel_reg_decode.c

/*
 * Copyright © 2006,2009,2015 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Authors:
 *    Eric Anholt <eric@anholt.net>
 *
 */

#include <errno.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>

#include "intel_chipset.h"
#include "intel_reg.h"

#include "intel_reg_spec.h"

/**
 * DEBUGSTRING:
 * @result: character string where to write
 * @len: maximum number of bytes to write
 * @reg: register offset
 * @val: register value
 * @devid: PCI device ID
 *
 * Print the decoded representation of the register value into @result.
 *
 * Returns: Number of bytes written to @result
 */
#define _DEBUGSTRING(func) \
	int func(char *result, int len, int reg, uint32_t val, uint32_t devid)
#define DEBUGSTRING(func) static _DEBUGSTRING(func)

/* snprintf that returns 0 when the thing didn't fit */
static int __attribute__((format(printf, 3, 4)))
z_snprintf(char *str, size_t size, const char *fmt, ...)
{
	va_list ap;
	int ret;

	va_start(ap, fmt);
	ret = vsnprintf(str, size, fmt, ap);
	va_end(ap);

	if (ret >= size) {
		fprintf(stderr, "snprintf() returned %d, expected < %zu\n",
			ret, size);
		return 0;
	}

	return ret;
}

DEBUGSTRING(i830_16bit_func)
{
	return z_snprintf(result, len, "0x%04x", (uint16_t) val);
}

DEBUGSTRING(i830_debug_dcc)
{
	const char *addressing = NULL;

	if (!IS_MOBILE(devid))
		return 0;

	if (IS_GEN4(devid)) {
		if (val & (1 << 1))
			addressing = "dual channel interleaved";
		else
			addressing = "single or dual channel asymmetric";
	} else {
		switch (val & 3) {
		case 0:
			addressing = "single channel";
			break;
		case 1:
			addressing = "dual channel asymmetric";
			break;
		case 2:
			addressing = "dual channel interleaved";
			break;
		case 3:
			addressing = "unknown channel layout";
			break;
		}
	}

	return z_snprintf(result, len, "%s, XOR randomization: %sabled, XOR bit: %d",
		 addressing,
		 (val & (1 << 10)) ? "dis" : "en",
		 (val & (1 << 9)) ? 17 : 11);
}

DEBUGSTRING(i830_debug_chdecmisc)
{
	const char *enhmodesel = NULL;

	switch ((val >> 5) & 3) {
	case 1:
		enhmodesel = "XOR bank/rank";
		break;
	case 2:
		enhmodesel = "swap bank";
		break;
	case 3:
		enhmodesel = "XOR bank";
		break;
	case 0:
		enhmodesel = "none";
		break;
	}

	return z_snprintf(result, len,
		 "%s, ch2 enh %sabled, ch1 enh %sabled, "
		 "ch0 enh %sabled, "
		 "flex %sabled, ep %spresent", enhmodesel,
		 (val & (1 << 4)) ? "en" : "dis",
		 (val & (1 << 3)) ? "en" : "dis",
		 (val & (1 << 2)) ? "en" : "dis",
		 (val & (1 << 1)) ? "en" : "dis",
		 (val & (1 << 0)) ? "" : "not ");
}

DEBUGSTRING(i830_debug_xyminus1)
{
	return z_snprintf(result, len, "%d, %d", (val & 0xffff) + 1,
		 ((val & 0xffff0000) >> 16) + 1);
}

DEBUGSTRING(i830_debug_yxminus1)
{
	return z_snprintf(result, len, "%d, %d", ((val & 0xffff0000) >> 16) + 1,
		 (val & 0xffff) + 1);
}

DEBUGSTRING(i830_debug_xy)
{
	return z_snprintf(result, len, "%d, %d", (val & 0xffff), ((val & 0xffff0000) >> 16));
}

DEBUGSTRING(i830_debug_dspstride)
{
	return z_snprintf(result, len, "%d bytes", val);
}

DEBUGSTRING(i830_debug_dspcntr)
{
	const char *enabled = val & DISPLAY_PLANE_ENABLE ? "enabled" : "disabled";
	char plane = val & DISPPLANE_SEL_PIPE_B ? 'B' : 'A';
	if (HAS_PCH_SPLIT(devid) || IS_BROXTON(devid))
		return z_snprintf(result, len, "%s", enabled);
	else
		return z_snprintf(result, len, "%s, pipe %c", enabled, plane);
}

DEBUGSTRING(i830_debug_pipeconf)
{
	const char *enabled = val & PIPEACONF_ENABLE ? "enabled" : "disabled";
	const char *bit30;
	char buf[256];
	int buf_len;

	if (IS_GEN2(devid) || IS_GEN3(devid))
		bit30 = val & PIPEACONF_DOUBLE_WIDE ?
			"double-wide" : "single-wide";
	else
		bit30 = val & I965_PIPECONF_ACTIVE ? "active" : "inactive";

	buf_len = z_snprintf(buf, sizeof(buf), "%s, %s", enabled, bit30);

	if (HAS_PCH_SPLIT(devid) || IS_BROXTON(devid)) {
		const char *interlace;
		int interlace_mode;

		if ((IS_IVYBRIDGE(devid) || IS_HASWELL(devid) ||
		     IS_BROADWELL(devid) || IS_GEN9(devid)))
			interlace_mode = (val >> 21) & 3;
		else
			interlace_mode = (val >> 21) & 7;

		switch (interlace_mode) {
		case 0:
			interlace = "pf-pd";
			break;
		case 1:
			interlace = "pf-id";
			break;
		case 3:
			interlace = "if-id";
			break;
		case 4:
			interlace = "if-id-dbl";
			break;
		case 5:
			interlace = "pf-id-dbl";
			break;
		default:
			interlace = "rsvd";
			break;
		}
		if (buf_len < sizeof(buf))
			buf_len += z_snprintf(&buf[buf_len], sizeof(buf) - buf_len,
					    ", %s", interlace);
	} else if (IS_GEN4(devid) || IS_VALLEYVIEW(devid) ||
		   IS_CHERRYVIEW(devid)) {
		const char *interlace;

		switch ((val >> 21) & 7) {
		case 0:
		case 1:
		case 2:
		case 3:
			interlace = "progressive";
			break;
		case 4:
			interlace = "interlaced embedded";
			break;
		case 5:
			interlace = "interlaced";
			break;
		case 6:
			interlace = "interlaced sdvo";
			break;
		case 7:
			interlace = "interlaced legacy";
			break;
		}
		if (buf_len < sizeof(buf))
			buf_len += z_snprintf(&buf[buf_len], sizeof(buf) - buf_len,
					    ", %s", interlace);
	}

	if (IS_HASWELL(devid) || IS_IVYBRIDGE(devid) ||
	    IS_GEN6(devid) || IS_GEN5(devid)) {
		const char *rotation;

		switch ((val >> 14) & 3) {
		case 0:
			rotation = "rotate 0";
			break;
		case 1:
			rotation = "rotate 90";
			break;
		case 2:
			rotation = "rotate 180";
			break;
		case 3:
			rotation = "rotate 270";
			break;
		}
		if (buf_len < sizeof(buf))
			buf_len += z_snprintf(&buf[buf_len], sizeof(buf) - buf_len,
					    ", %s", rotation);
	}

	if (IS_IVYBRIDGE(devid) || IS_GEN6(devid) || IS_GEN5(devid)) {
		const char *bpc;

		switch (val & (7 << 5)) {
		case PIPECONF_8BPP:
			bpc = "8bpc";
			break;
		case PIPECONF_10BPP:
			bpc = "10bpc";
			break;
		case PIPECONF_6BPP:
			bpc = "6bpc";
			break;
		case PIPECONF_12BPP:
			bpc = "12bpc";
			break;
		default:
			bpc = "invalid bpc";
			break;
		}
		if (buf_len < sizeof(buf))
			buf_len += z_snprintf(&buf[buf_len], sizeof(buf) - buf_len,
					    ", %s", bpc);
	}

	return z_snprintf(result, len, "%s", buf);
}

DEBUGSTRING(i830_debug_pipestat)
{
	const char *_FIFO_UNDERRUN = val & FIFO_UNDERRUN ? " FIFO_UNDERRUN" : "";
	const char *_CRC_ERROR_ENABLE =
	    val & CRC_ERROR_ENABLE ? " CRC_ERROR_ENABLE" : "";
	const char *_CRC_DONE_ENABLE =
	    val & CRC_DONE_ENABLE ? " CRC_DONE_ENABLE" : "";
	const char *_GMBUS_EVENT_ENABLE =
	    val & GMBUS_EVENT_ENABLE ? " GMBUS_EVENT_ENABLE" : "";
	const char *_VSYNC_INT_ENABLE =
	    val & VSYNC_INT_ENABLE ? " VSYNC_INT_ENABLE" : "";
	const char *_DLINE_COMPARE_ENABLE =
	    val & DLINE_COMPARE_ENABLE ? " DLINE_COMPARE_ENABLE" : "";
	const char *_DPST_EVENT_ENABLE =
	    val & DPST_EVENT_ENABLE ? " DPST_EVENT_ENABLE" : "";
	const char *_LBLC_EVENT_ENABLE =
	    val & LBLC_EVENT_ENABLE ? " LBLC_EVENT_ENABLE" : "";
	const char *_OFIELD_INT_ENABLE =
	    val & OFIELD_INT_ENABLE ? " OFIELD_INT_ENABLE" : "";
	const char *_EFIELD_INT_ENABLE =
	    val & EFIELD_INT_ENABLE ? " EFIELD_INT_ENABLE" : "";
	const char *_SVBLANK_INT_ENABLE =
	    val & SVBLANK_INT_ENABLE ? " SVBLANK_INT_ENABLE" : "";
	const char *_VBLANK_INT_ENABLE =
	    val & VBLANK_INT_ENABLE ? " VBLANK_INT_ENABLE" : "";
	const char *_OREG_UPDATE_ENABLE =
	    val & OREG_UPDATE_ENABLE ? " OREG_UPDATE_ENABLE" : "";
	const char *_CRC_ERROR_INT_STATUS =
	    val & CRC_ERROR_INT_STATUS ? " CRC_ERROR_INT_STATUS" : "";
	const char *_CRC_DONE_INT_STATUS =
	    val & CRC_DONE_INT_STATUS ? " CRC_DONE_INT_STATUS" : "";
	const char *_GMBUS_INT_STATUS =
	    val & GMBUS_INT_STATUS ? " GMBUS_INT_STATUS" : "";
	const char *_VSYNC_INT_STATUS =
	    val & VSYNC_INT_STATUS ? " VSYNC_INT_STATUS" : "";
	const char *_DLINE_COMPARE_STATUS =
	    val & DLINE_COMPARE_STATUS ? " DLINE_COMPARE_STATUS" : "";
	const char *_DPST_EVENT_STATUS =
	    val & DPST_EVENT_STATUS ? " DPST_EVENT_STATUS" : "";
	const char *_LBLC_EVENT_STATUS =
	    val & LBLC_EVENT_STATUS ? " LBLC_EVENT_STATUS" : "";
	const char *_OFIELD_INT_STATUS =
	    val & OFIELD_INT_STATUS ? " OFIELD_INT_STATUS" : "";
	const char *_EFIELD_INT_STATUS =
	    val & EFIELD_INT_STATUS ? " EFIELD_INT_STATUS" : "";
	const char *_SVBLANK_INT_STATUS =
	    val & SVBLANK_INT_STATUS ? " SVBLANK_INT_STATUS" : "";
	const char *_VBLANK_INT_STATUS =
	    val & VBLANK_INT_STATUS ? " VBLANK_INT_STATUS" : "";
	const char *_OREG_UPDATE_STATUS =
	    val & OREG_UPDATE_STATUS ? " OREG_UPDATE_STATUS" : "";
	return z_snprintf(result, len,
		 "status:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
		 _FIFO_UNDERRUN,
		 _CRC_ERROR_ENABLE,
		 _CRC_DONE_ENABLE,
		 _GMBUS_EVENT_ENABLE,
		 _VSYNC_INT_ENABLE,
		 _DLINE_COMPARE_ENABLE,
		 _DPST_EVENT_ENABLE,
		 _LBLC_EVENT_ENABLE,
		 _OFIELD_INT_ENABLE,
		 _EFIELD_INT_ENABLE,
		 _SVBLANK_INT_ENABLE,
		 _VBLANK_INT_ENABLE,
		 _OREG_UPDATE_ENABLE,
		 _CRC_ERROR_INT_STATUS,
		 _CRC_DONE_INT_STATUS,
		 _GMBUS_INT_STATUS,
		 _VSYNC_INT_STATUS,
		 _DLINE_COMPARE_STATUS,
		 _DPST_EVENT_STATUS,
		 _LBLC_EVENT_STATUS,
		 _OFIELD_INT_STATUS,
		 _EFIELD_INT_STATUS,
		 _SVBLANK_INT_STATUS,
		 _VBLANK_INT_STATUS,
		 _OREG_UPDATE_STATUS);
}

DEBUGSTRING(ivb_debug_port)
{
	const char *drrs = NULL;
	switch (val & (2 << 30)) {
		case PORT_DBG_DRRS_HW_STATE_OFF:
			drrs = "off";
			break;
		case PORT_DBG_DRRS_HW_STATE_LOW:
			drrs = "low";
			break;
		case PORT_DBG_DRRS_HW_STATE_HIGH:
			drrs = "high";
			break;
	}
	return z_snprintf(result, len, "HW DRRS %s",
			drrs);
}

DEBUGSTRING(i830_debug_hvtotal)
{
	return z_snprintf(result, len, "%d active, %d total",
		 (val & 0xffff) + 1,
		 ((val & 0xffff0000) >> 16) + 1);
}

DEBUGSTRING(i830_debug_hvsyncblank)
{
	return z_snprintf(result, len, "%d start, %d end",
		 (val & 0xffff) + 1,
		 ((val & 0xffff0000) >> 16) + 1);
}

DEBUGSTRING(i830_debug_vgacntrl)
{
	return z_snprintf(result, len, "%s",
		 val & VGA_DISP_DISABLE ? "disabled" : "enabled");
}

DEBUGSTRING(i830_debug_fp)
{
	if (IS_PINEVIEW(devid)) {
		return z_snprintf(result, len, "n = %d, m1 = %d, m2 = %d",
			 ffs((val & FP_N_IGD_DIV_MASK) >>
			     FP_N_DIV_SHIFT) - 1,
			 ((val & FP_M1_DIV_MASK) >> FP_M1_DIV_SHIFT),
			 ((val & FP_M2_IGD_DIV_MASK) >>
			  FP_M2_DIV_SHIFT));
	}
	return z_snprintf(result, len, "n = %d, m1 = %d, m2 = %d",
		 ((val & FP_N_DIV_MASK) >> FP_N_DIV_SHIFT),
		 ((val & FP_M1_DIV_MASK) >> FP_M1_DIV_SHIFT),
		 ((val & FP_M2_DIV_MASK) >> FP_M2_DIV_SHIFT));
}

DEBUGSTRING(i830_debug_vga_pd)
{
	int vga0_p1, vga0_p2, vga1_p1, vga1_p2;

	/* XXX: i9xx version */

	if (val & VGA0_PD_P1_DIV_2)
		vga0_p1 = 2;
	else
		vga0_p1 = ((val & VGA0_PD_P1_MASK) >> VGA0_PD_P1_SHIFT) + 2;
	vga0_p2 = (val & VGA0_PD_P2_DIV_4) ? 4 : 2;

	if (val & VGA1_PD_P1_DIV_2)
		vga1_p1 = 2;
	else
		vga1_p1 = ((val & VGA1_PD_P1_MASK) >> VGA1_PD_P1_SHIFT) + 2;
	vga1_p2 = (val & VGA1_PD_P2_DIV_4) ? 4 : 2;

	return z_snprintf(result, len, "vga0 p1 = %d, p2 = %d, vga1 p1 = %d, p2 = %d",
			 vga0_p1, vga0_p2, vga1_p1, vga1_p2);
}

DEBUGSTRING(i830_debug_pp_status)
{
	const char *status = val & PP_ON ? "on" : "off";
	const char *ready = val & PP_READY ? "ready" : "not ready";
	const char *seq = "unknown";

	switch (val & PP_SEQUENCE_MASK) {
	case PP_SEQUENCE_NONE:
		seq = "idle";
		break;
	case PP_SEQUENCE_ON:
		seq = "on";
		break;
	case PP_SEQUENCE_OFF:
		seq = "off";
		break;
	}

	return z_snprintf(result, len, "%s, %s, sequencing %s", status, ready, seq);
}

DEBUGSTRING(i830_debug_pp_control)
{
	return z_snprintf(result, len, "power target: %s",
			 val & POWER_TARGET_ON ? "on" : "off");
}

DEBUGSTRING(i830_debug_dpll)
{
	const char *enabled = val & DPLL_VCO_ENABLE ? "enabled" : "disabled";
	const char *dvomode = val & DPLL_DVO_HIGH_SPEED ? "dvo" : "non-dvo";
	const char *vgamode = val & DPLL_VGA_MODE_DIS ? "" : ", VGA";
	const char *mode = "unknown";
	const char *clock = "unknown";
	const char *fpextra = val & DISPLAY_RATE_SELECT_FPA1 ? ", using FPx1!" : "";
	char sdvoextra[20];
	int p1 = 0, p2 = 0;

	if (IS_GEN2(devid)) {
#if 0 /* removed due to use of INREG */
		char is_lvds = (INREG(LVDS) & LVDS_PORT_EN) && (reg == DPLL_B);

		if (is_lvds) {
			mode = "LVDS";
			p1 = ffs((val & DPLL_FPA01_P1_POST_DIV_MASK_I830_LVDS)
				 >> DPLL_FPA01_P1_POST_DIV_SHIFT);
			if ((INREG(LVDS) & LVDS_CLKB_POWER_MASK) ==
			    LVDS_CLKB_POWER_UP)
				p2 = 7;
			else
				p2 = 14;

		} else {
			mode = "DAC/serial";
			if (val & PLL_P1_DIVIDE_BY_TWO) {
				p1 = 2;
			} else {
				/* Map the number in the field to (3, 33) */
				p1 = ((val & DPLL_FPA01_P1_POST_DIV_MASK_I830)
				      >> DPLL_FPA01_P1_POST_DIV_SHIFT) + 2;
			}
			if (val & PLL_P2_DIVIDE_BY_4)
				p2 = 4;
			else
				p2 = 2;
		}
#endif
	} else {
		if (IS_PINEVIEW(devid)) {
			p1 = ffs((val & DPLL_FPA01_P1_POST_DIV_MASK_IGD) >>
				 DPLL_FPA01_P1_POST_DIV_SHIFT_IGD);
		} else {
			p1 = ffs((val & DPLL_FPA01_P1_POST_DIV_MASK) >>
				 DPLL_FPA01_P1_POST_DIV_SHIFT);
		}
		switch (val & DPLL_MODE_MASK) {
		case DPLLB_MODE_DAC_SERIAL:
			mode = "DAC/serial";
			p2 = val & DPLL_DAC_SERIAL_P2_CLOCK_DIV_5 ? 5 : 10;
			break;
		case DPLLB_MODE_LVDS:
			mode = "LVDS";
			p2 = val & DPLLB_LVDS_P2_CLOCK_DIV_7 ? 7 : 14;
			break;
		}
	}

	switch (val & PLL_REF_INPUT_MASK) {
	case PLL_REF_INPUT_DREFCLK:
		clock = "default";
		break;
	case PLL_REF_INPUT_TVCLKINA:
		clock = "TV A";
		break;
	case PLL_REF_INPUT_TVCLKINBC:
		clock = "TV B/C";
		break;
	case PLLB_REF_INPUT_SPREADSPECTRUMIN:
		if (reg == DPLL_B)
			clock = "spread spectrum";
		break;
	}

	if (IS_945(devid)) {
		sprintf(sdvoextra, ", SDVO mult %d",
			(int)((val & SDVO_MULTIPLIER_MASK) >>
			      SDVO_MULTIPLIER_SHIFT_HIRES) + 1);
	} else {
		sdvoextra[0] = '\0';
	}

	return z_snprintf(result, len, "%s, %s%s, %s clock, %s mode, p1 = %d, "
			 "p2 = %d%s%s",
			 enabled, dvomode, vgamode, clock, mode, p1, p2,
			 fpextra, sdvoextra);
}

DEBUGSTRING(i830_debug_dpll_test)
{
	const char *dpllandiv = val & DPLLA_TEST_N_BYPASS ? ", DPLLA N bypassed" : "";
	const char *dpllamdiv = val & DPLLA_TEST_M_BYPASS ? ", DPLLA M bypassed" : "";
	const char *dpllainput = val & DPLLA_INPUT_BUFFER_ENABLE ?
	    "" : ", DPLLA input buffer disabled";
	const char *dpllbndiv = val & DPLLB_TEST_N_BYPASS ? ", DPLLB N bypassed" : "";
	const char *dpllbmdiv = val & DPLLB_TEST_M_BYPASS ? ", DPLLB M bypassed" : "";
	const char *dpllbinput = val & DPLLB_INPUT_BUFFER_ENABLE ?
	    "" : ", DPLLB input buffer disabled";

	return z_snprintf(result, len, "%s%s%s%s%s%s",
			 dpllandiv, dpllamdiv, dpllainput,
			 dpllbndiv, dpllbmdiv, dpllbinput);
}

DEBUGSTRING(i830_debug_adpa)
{
	char disp_pipe = (val & ADPA_PIPE_B_SELECT) ? 'B' : 'A';
	const char *enable = (val & ADPA_DAC_ENABLE) ? "enabled" : "disabled";
	char hsync = (val & ADPA_HSYNC_ACTIVE_HIGH) ? '+' : '-';
	char vsync = (val & ADPA_VSYNC_ACTIVE_HIGH) ? '+' : '-';

	if (HAS_CPT)
		disp_pipe = val & (1<<29) ? 'B' : 'A';

	if (HAS_PCH_SPLIT(devid))
		return z_snprintf(result, len, "%s, transcoder %c, %chsync, %cvsync",
				 enable, disp_pipe, hsync, vsync);
	else
		return z_snprintf(result, len, "%s, pipe %c, %chsync, %cvsync",
				 enable, disp_pipe, hsync, vsync);
}

DEBUGSTRING(i830_debug_lvds)
{
	char disp_pipe = val & LVDS_PIPEB_SELECT ? 'B' : 'A';
	const char *enable = val & LVDS_PORT_EN ? "enabled" : "disabled";
	int depth;
	const char *channels;

	if ((val & LVDS_A3_POWER_MASK) == LVDS_A3_POWER_UP)
		depth = 24;
	else
		depth = 18;
	if ((val & LVDS_B0B3_POWER_MASK) == LVDS_B0B3_POWER_UP)
		channels = "2 channels";
	else
		channels = "1 channel";

	if (HAS_CPT)
		disp_pipe = val & (1<<29) ? 'B' : 'A';

	return z_snprintf(result, len, "%s, pipe %c, %d bit, %s",
			 enable, disp_pipe, depth, channels);
}

DEBUGSTRING(i830_debug_dvo)
{
	const char *enable = val & DVO_ENABLE ? "enabled" : "disabled";
	char disp_pipe = val & DVO_PIPE_B_SELECT ? 'B' : 'A';
	const char *stall;
	char hsync = val & DVO_HSYNC_ACTIVE_HIGH ? '+' : '-';
	char vsync = val & DVO_VSYNC_ACTIVE_HIGH ? '+' : '-';

	switch (val & DVO_PIPE_STALL_MASK) {
	case DVO_PIPE_STALL_UNUSED:
		stall = "no stall";
		break;
	case DVO_PIPE_STALL:
		stall = "stall";
		break;
	case DVO_PIPE_STALL_TV:
		stall = "TV stall";
		break;
	default:
		stall = "unknown stall";
		break;
	}

	return z_snprintf(result, len, "%s, pipe %c, %s, %chsync, %cvsync",
			 enable, disp_pipe, stall, hsync, vsync);
}

DEBUGSTRING(i830_debug_sdvo)
{
	const char *enable = val & SDVO_ENABLE ? "enabled" : "disabled";
	char disp_pipe = val & SDVO_PIPE_B_SELECT ? 'B' : 'A';
	const char *stall = val & SDVO_STALL_SELECT ? "enabled" : "disabled";
	const char *detected = val & SDVO_DETECTED ? "" : "not ";
	const char *gang = val & SDVOC_GANG_MODE ? ", gang mode" : "";
	char sdvoextra[20];

	if (IS_915(devid)) {
		sprintf(sdvoextra, ", SDVO mult %d",
			(int)((val & SDVO_PORT_MULTIPLY_MASK) >>
			      SDVO_PORT_MULTIPLY_SHIFT) + 1);
	} else {
		sdvoextra[0] = '\0';
	}

	return z_snprintf(result, len, "%s, pipe %c, stall %s, %sdetected%s%s",
			 enable, disp_pipe, stall, detected, sdvoextra, gang);
}

DEBUGSTRING(i830_debug_dspclk_gate_d)
{
	const char *DPUNIT_B = val & DPUNIT_B_CLOCK_GATE_DISABLE ? " DPUNIT_B" : "";
	const char *VSUNIT = val & VSUNIT_CLOCK_GATE_DISABLE ? " VSUNIT" : "";
	const char *VRHUNIT = val & VRHUNIT_CLOCK_GATE_DISABLE ? " VRHUNIT" : "";
	const char *VRDUNIT = val & VRDUNIT_CLOCK_GATE_DISABLE ? " VRDUNIT" : "";
	const char *AUDUNIT = val & AUDUNIT_CLOCK_GATE_DISABLE ? " AUDUNIT" : "";
	const char *DPUNIT_A = val & DPUNIT_A_CLOCK_GATE_DISABLE ? " DPUNIT_A" : "";
	const char *DPCUNIT = val & DPCUNIT_CLOCK_GATE_DISABLE ? " DPCUNIT" : "";
	const char *TVRUNIT = val & TVRUNIT_CLOCK_GATE_DISABLE ? " TVRUNIT" : "";
	const char *TVCUNIT = val & TVCUNIT_CLOCK_GATE_DISABLE ? " TVCUNIT" : "";
	const char *TVFUNIT = val & TVFUNIT_CLOCK_GATE_DISABLE ? " TVFUNIT" : "";
	const char *TVEUNIT = val & TVEUNIT_CLOCK_GATE_DISABLE ? " TVEUNIT" : "";
	const char *DVSUNIT = val & DVSUNIT_CLOCK_GATE_DISABLE ? " DVSUNIT" : "";
	const char *DSSUNIT = val & DSSUNIT_CLOCK_GATE_DISABLE ? " DSSUNIT" : "";
	const char *DDBUNIT = val & DDBUNIT_CLOCK_GATE_DISABLE ? " DDBUNIT" : "";
	const char *DPRUNIT = val & DPRUNIT_CLOCK_GATE_DISABLE ? " DPRUNIT" : "";
	const char *DPFUNIT = val & DPFUNIT_CLOCK_GATE_DISABLE ? " DPFUNIT" : "";
	const char *DPBMUNIT = val & DPBMUNIT_CLOCK_GATE_DISABLE ? " DPBMUNIT" : "";
	const char *DPLSUNIT = val & DPLSUNIT_CLOCK_GATE_DISABLE ? " DPLSUNIT" : "";
	const char *DPLUNIT = val & DPLUNIT_CLOCK_GATE_DISABLE ? " DPLUNIT" : "";
	const char *DPOUNIT = val & DPOUNIT_CLOCK_GATE_DISABLE ? " DPOUNIT" : "";
	const char *DPBUNIT = val & DPBUNIT_CLOCK_GATE_DISABLE ? " DPBUNIT" : "";
	const char *DCUNIT = val & DCUNIT_CLOCK_GATE_DISABLE ? " DCUNIT" : "";
	const char *DPUNIT = val & DPUNIT_CLOCK_GATE_DISABLE ? " DPUNIT" : "";
	const char *VRUNIT = val & VRUNIT_CLOCK_GATE_DISABLE ? " VRUNIT" : "";
	const char *OVHUNIT = val & OVHUNIT_CLOCK_GATE_DISABLE ? " OVHUNIT" : "";
	const char *DPIOUNIT = val & DPIOUNIT_CLOCK_GATE_DISABLE ? " DPIOUNIT" : "";
	const char *OVFUNIT = val & OVFUNIT_CLOCK_GATE_DISABLE ? " OVFUNIT" : "";
	const char *OVBUNIT = val & OVBUNIT_CLOCK_GATE_DISABLE ? " OVBUNIT" : "";
	const char *OVRUNIT = val & OVRUNIT_CLOCK_GATE_DISABLE ? " OVRUNIT" : "";
	const char *OVCUNIT = val & OVCUNIT_CLOCK_GATE_DISABLE ? " OVCUNIT" : "";
	const char *OVUUNIT = val & OVUUNIT_CLOCK_GATE_DISABLE ? " OVUUNIT" : "";
	const char *OVLUNIT = val & OVLUNIT_CLOCK_GATE_DISABLE ? " OVLUNIT" : "";

	return z_snprintf(result, len,
		 "clock gates disabled:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
		 DPUNIT_B, VSUNIT, VRHUNIT, VRDUNIT, AUDUNIT, DPUNIT_A, DPCUNIT,
		 TVRUNIT, TVCUNIT, TVFUNIT, TVEUNIT, DVSUNIT, DSSUNIT, DDBUNIT,
		 DPRUNIT, DPFUNIT, DPBMUNIT, DPLSUNIT, DPLUNIT, DPOUNIT, DPBUNIT,
		 DCUNIT, DPUNIT, VRUNIT, OVHUNIT, DPIOUNIT, OVFUNIT, OVBUNIT,
		 OVRUNIT, OVCUNIT, OVUUNIT, OVLUNIT);
}

DEBUGSTRING(i810_debug_915_fence)
{
	char format = (val & 1 << 12) ? 'Y' : 'X';
	int pitch = 128 << ((val & 0x70) >> 4);
	unsigned int offset = val & 0x0ff00000;
	int size = (1024 * 1024) << ((val & 0x700) >> 8);

	if (IS_GEN4(devid) || (IS_915(devid) && reg >= FENCE_NEW))
		return 0;

	if (format == 'X')
		pitch *= 4;
	if (val & 1) {
		return z_snprintf(result, len, "enabled, %c tiled, %4d pitch, 0x%08x - 0x%08x (%dkb)",
			 format, pitch, offset, offset + size,
			 size / 1024);
	} else {
		return z_snprintf(result, len, "disabled");
	}
}

DEBUGSTRING(i810_debug_965_fence_start)
{
	const char *enable = (val & FENCE_VALID) ? " enabled" : "disabled";
	char format = (val & I965_FENCE_Y_MAJOR) ? 'Y' : 'X';
	int pitch = ((val & 0xffc) >> 2) * 128 + 128;
	unsigned int offset = val & 0xfffff000;

	if (!IS_GEN4(devid) && !IS_GEN5(devid))
		return 0;

	return z_snprintf(result, len, "%s, %c tile walk, %4d pitch, 0x%08x start",
		 enable, format, pitch, offset);
}

DEBUGSTRING(i810_debug_965_fence_end)
{
	unsigned int end = val & 0xfffff000;

	if (!IS_GEN4(devid))
		return 0;

	return z_snprintf(result, len, "                                   0x%08x end", end);
}

#define DEFINEREG(reg) \
	{ reg, #reg, NULL }
#define DEFINEREG_16BIT(reg) \
	{ reg, #reg, i830_16bit_func }
#define DEFINEREG2(reg, func) \
	{ reg, #reg, func }

struct reg_debug {
	int reg;
	const char *name;
	_DEBUGSTRING((*debug_output));
};

static const struct reg_debug intel_debug_regs[] = {
	DEFINEREG2(DCC, i830_debug_dcc),
	DEFINEREG2(CHDECMISC, i830_debug_chdecmisc),
	DEFINEREG_16BIT(C0DRB0),
	DEFINEREG_16BIT(C0DRB1),
	DEFINEREG_16BIT(C0DRB2),
	DEFINEREG_16BIT(C0DRB3),
	DEFINEREG_16BIT(C1DRB0),
	DEFINEREG_16BIT(C1DRB1),
	DEFINEREG_16BIT(C1DRB2),
	DEFINEREG_16BIT(C1DRB3),
	DEFINEREG_16BIT(C0DRA01),
	DEFINEREG_16BIT(C0DRA23),
	DEFINEREG_16BIT(C1DRA01),
	DEFINEREG_16BIT(C1DRA23),

	DEFINEREG(PGETBL_CTL),

	DEFINEREG2(VCLK_DIVISOR_VGA0, i830_debug_fp),
	DEFINEREG2(VCLK_DIVISOR_VGA1, i830_debug_fp),
	DEFINEREG2(VCLK_POST_DIV, i830_debug_vga_pd),
	DEFINEREG2(DPLL_TEST, i830_debug_dpll_test),
	DEFINEREG(CACHE_MODE_0),
	DEFINEREG(D_STATE),
	DEFINEREG2(DSPCLK_GATE_D, i830_debug_dspclk_gate_d),
	DEFINEREG(RENCLK_GATE_D1),
	DEFINEREG(RENCLK_GATE_D2),
/*  DEFINEREG(RAMCLK_GATE_D),	CRL only */
	DEFINEREG2(SDVOB, i830_debug_sdvo),
	DEFINEREG2(SDVOC, i830_debug_sdvo),
/*    DEFINEREG(UDIB_SVB_SHB_CODES), CRL only */
/*    DEFINEREG(UDIB_SHA_BLANK_CODES), CRL only */
	DEFINEREG(SDVOUDI),
	DEFINEREG(DSPARB),
	DEFINEREG(FW_BLC),
	DEFINEREG(FW_BLC2),
	DEFINEREG(FW_BLC_SELF),
	DEFINEREG(DSPFW1),
	DEFINEREG(DSPFW2),
	DEFINEREG(DSPFW3),

	DEFINEREG2(ADPA, i830_debug_adpa),
	DEFINEREG2(LVDS, i830_debug_lvds),
	DEFINEREG2(DVOA, i830_debug_dvo),
	DEFINEREG2(DVOB, i830_debug_dvo),
	DEFINEREG2(DVOC, i830_debug_dvo),
	DEFINEREG(DVOA_SRCDIM),
	DEFINEREG(DVOB_SRCDIM),
	DEFINEREG(DVOC_SRCDIM),

	DEFINEREG(BLC_PWM_CTL),
	DEFINEREG(BLC_PWM_CTL2),

	DEFINEREG2(PP_CONTROL, i830_debug_pp_control),
	DEFINEREG2(PP_STATUS, i830_debug_pp_status),
	DEFINEREG(PP_ON_DELAYS),
	DEFINEREG(PP_OFF_DELAYS),
	DEFINEREG(PP_DIVISOR),
	DEFINEREG(PFIT_CONTROL),
	DEFINEREG(PFIT_PGM_RATIOS),
	DEFINEREG(PORT_HOTPLUG_EN),
	DEFINEREG(PORT_HOTPLUG_STAT),

	DEFINEREG2(DSPACNTR, i830_debug_dspcntr),
	DEFINEREG2(DSPASTRIDE, i830_debug_dspstride),
	DEFINEREG2(DSPAPOS, i830_debug_xy),
	DEFINEREG2(DSPASIZE, i830_debug_xyminus1),
	DEFINEREG(DSPABASE),
	DEFINEREG(DSPASURF),
	DEFINEREG(DSPATILEOFF),
	DEFINEREG2(PIPEACONF, i830_debug_pipeconf),
	DEFINEREG2(PIPEASRC, i830_debug_yxminus1),
	DEFINEREG2(PIPEASTAT, i830_debug_pipestat),
	DEFINEREG(PIPEA_GMCH_DATA_M),
	DEFINEREG(PIPEA_GMCH_DATA_N),
	DEFINEREG(PIPEA_DP_LINK_M),
	DEFINEREG(PIPEA_DP_LINK_N),
	DEFINEREG(CURSOR_A_BASE),
	DEFINEREG(CURSOR_A_CONTROL),
	DEFINEREG(CURSOR_A_POSITION),

	DEFINEREG2(FPA0, i830_debug_fp),
	DEFINEREG2(FPA1, i830_debug_fp),
	DEFINEREG2(DPLL_A, i830_debug_dpll),
	DEFINEREG(DPLL_A_MD),
	DEFINEREG2(HTOTAL_A, i830_debug_hvtotal),
	DEFINEREG2(HBLANK_A, i830_debug_hvsyncblank),
	DEFINEREG2(HSYNC_A, i830_debug_hvsyncblank),
	DEFINEREG2(VTOTAL_A, i830_debug_hvtotal),
	DEFINEREG2(VBLANK_A, i830_debug_hvsyncblank),
	DEFINEREG2(VSYNC_A, i830_debug_hvsyncblank),
	DEFINEREG(BCLRPAT_A),
	DEFINEREG(VSYNCSHIFT_A),

	DEFINEREG2(DSPBCNTR, i830_debug_dspcntr),
	DEFINEREG2(DSPBSTRIDE, i830_debug_dspstride),
	DEFINEREG2(DSPBPOS, i830_debug_xy),
	DEFINEREG2(DSPBSIZE, i830_debug_xyminus1),
	DEFINEREG(DSPBBASE),
	DEFINEREG(DSPBSURF),
	DEFINEREG(DSPBTILEOFF),
	DEFINEREG2(PIPEBCONF, i830_debug_pipeconf),
	DEFINEREG2(PIPEBSRC, i830_debug_yxminus1),
	DEFINEREG2(PIPEBSTAT, i830_debug_pipestat),
	DEFINEREG(PIPEB_GMCH_DATA_M),
	DEFINEREG(PIPEB_GMCH_DATA_N),
	DEFINEREG(PIPEB_DP_LINK_M),
	DEFINEREG(PIPEB_DP_LINK_N),
	DEFINEREG(CURSOR_B_BASE),
	DEFINEREG(CURSOR_B_CONTROL),
	DEFINEREG(CURSOR_B_POSITION),

	DEFINEREG2(FPB0, i830_debug_fp),
	DEFINEREG2(FPB1, i830_debug_fp),
	DEFINEREG2(DPLL_B, i830_debug_dpll),
	DEFINEREG(DPLL_B_MD),
	DEFINEREG2(HTOTAL_B, i830_debug_hvtotal),
	DEFINEREG2(HBLANK_B, i830_debug_hvsyncblank),
	DEFINEREG2(HSYNC_B, i830_debug_hvsyncblank),
	DEFINEREG2(VTOTAL_B, i830_debug_hvtotal),
	DEFINEREG2(VBLANK_B, i830_debug_hvsyncblank),
	DEFINEREG2(VSYNC_B, i830_debug_hvsyncblank),
	DEFINEREG(BCLRPAT_B),
	DEFINEREG(VSYNCSHIFT_B),

	DEFINEREG(VCLK_DIVISOR_VGA0),
	DEFINEREG(VCLK_DIVISOR_VGA1),
	DEFINEREG(VCLK_POST_DIV),
	DEFINEREG2(VGACNTRL, i830_debug_vgacntrl),

	DEFINEREG(TV_CTL),
	DEFINEREG(TV_DAC),
	DEFINEREG(TV_CSC_Y),
	DEFINEREG(TV_CSC_Y2),
	DEFINEREG(TV_CSC_U),
	DEFINEREG(TV_CSC_U2),
	DEFINEREG(TV_CSC_V),
	DEFINEREG(TV_CSC_V2),
	DEFINEREG(TV_CLR_KNOBS),
	DEFINEREG(TV_CLR_LEVEL),
	DEFINEREG(TV_H_CTL_1),
	DEFINEREG(TV_H_CTL_2),
	DEFINEREG(TV_H_CTL_3),
	DEFINEREG(TV_V_CTL_1),
	DEFINEREG(TV_V_CTL_2),
	DEFINEREG(TV_V_CTL_3),
	DEFINEREG(TV_V_CTL_4),
	DEFINEREG(TV_V_CTL_5),
	DEFINEREG(TV_V_CTL_6),
	DEFINEREG(TV_V_CTL_7),
	DEFINEREG(TV_SC_CTL_1),
	DEFINEREG(TV_SC_CTL_2),
	DEFINEREG(TV_SC_CTL_3),
	DEFINEREG(TV_WIN_POS),
	DEFINEREG(TV_WIN_SIZE),
	DEFINEREG(TV_FILTER_CTL_1),
	DEFINEREG(TV_FILTER_CTL_2),
	DEFINEREG(TV_FILTER_CTL_3),
	DEFINEREG(TV_CC_CONTROL),
	DEFINEREG(TV_CC_DATA),
	DEFINEREG(TV_H_LUMA_0),
	DEFINEREG(TV_H_LUMA_59),
	DEFINEREG(TV_H_CHROMA_0),
	DEFINEREG(TV_H_CHROMA_59),

	DEFINEREG(FBC_CFB_BASE),
	DEFINEREG(FBC_LL_BASE),
	DEFINEREG(FBC_CONTROL),
	DEFINEREG(FBC_COMMAND),
	DEFINEREG(FBC_STATUS),
	DEFINEREG(FBC_CONTROL2),
	DEFINEREG(FBC_FENCE_OFF),
	DEFINEREG(FBC_MOD_NUM),

	DEFINEREG(MI_MODE),
	/* DEFINEREG(MI_DISPLAY_POWER_DOWN), CRL only */
	DEFINEREG(MI_ARB_STATE),
	DEFINEREG(MI_RDRET_STATE),
	DEFINEREG(ECOSKPD),

	DEFINEREG(DP_B),
	DEFINEREG(DPB_AUX_CH_CTL),
	DEFINEREG(DPB_AUX_CH_DATA1),
	DEFINEREG(DPB_AUX_CH_DATA2),
	DEFINEREG(DPB_AUX_CH_DATA3),
	DEFINEREG(DPB_AUX_CH_DATA4),
	DEFINEREG(DPB_AUX_CH_DATA5),

	DEFINEREG(DP_C),
	DEFINEREG(DPC_AUX_CH_CTL),
	DEFINEREG(DPC_AUX_CH_DATA1),
	DEFINEREG(DPC_AUX_CH_DATA2),
	DEFINEREG(DPC_AUX_CH_DATA3),
	DEFINEREG(DPC_AUX_CH_DATA4),
	DEFINEREG(DPC_AUX_CH_DATA5),

	DEFINEREG(DP_D),
	DEFINEREG(DPD_AUX_CH_CTL),
	DEFINEREG(DPD_AUX_CH_DATA1),
	DEFINEREG(DPD_AUX_CH_DATA2),
	DEFINEREG(DPD_AUX_CH_DATA3),
	DEFINEREG(DPD_AUX_CH_DATA4),
	DEFINEREG(DPD_AUX_CH_DATA5),

	DEFINEREG(AUD_CONFIG),
	DEFINEREG(AUD_HDMIW_STATUS),
	DEFINEREG(AUD_CONV_CHCNT),
	DEFINEREG(VIDEO_DIP_CTL),
	DEFINEREG(AUD_PINW_CNTR),
	DEFINEREG(AUD_CNTL_ST),
	DEFINEREG(AUD_PIN_CAP),
	DEFINEREG(AUD_PINW_CAP),
	DEFINEREG(AUD_PINW_UNSOLRESP),
	DEFINEREG(AUD_OUT_DIG_CNVT),
	DEFINEREG(AUD_OUT_CWCAP),
	DEFINEREG(AUD_GRP_CAP),

#define DEFINEFENCE_915(i) \
	{ FENCE+i*4, "FENCE  " #i, i810_debug_915_fence }
#define DEFINEFENCE_945(i) \
	{ FENCE_NEW+(i - 8) * 4, "FENCE  " #i, i810_debug_915_fence }

	DEFINEFENCE_915(0),
	DEFINEFENCE_915(1),
	DEFINEFENCE_915(2),
	DEFINEFENCE_915(3),
	DEFINEFENCE_915(4),
	DEFINEFENCE_915(5),
	DEFINEFENCE_915(6),
	DEFINEFENCE_915(7),
	DEFINEFENCE_945(8),
	DEFINEFENCE_945(9),
	DEFINEFENCE_945(10),
	DEFINEFENCE_945(11),
	DEFINEFENCE_945(12),
	DEFINEFENCE_945(13),
	DEFINEFENCE_945(14),
	DEFINEFENCE_945(15),

	DEFINEREG(INST_PM),
};

static const struct reg_debug i965_fences[] = {
#define DEFINEFENCE_965(i) \
	{ FENCE_NEW+i*8, "FENCE START " #i, i810_debug_965_fence_start }, \
	{ FENCE_NEW+i*8+4, "FENCE END " #i, i810_debug_965_fence_end }

	DEFINEFENCE_965(0),
	DEFINEFENCE_965(1),
	DEFINEFENCE_965(2),
	DEFINEFENCE_965(3),
	DEFINEFENCE_965(4),
	DEFINEFENCE_965(5),
	DEFINEFENCE_965(6),
	DEFINEFENCE_965(7),
	DEFINEFENCE_965(8),
	DEFINEFENCE_965(9),
	DEFINEFENCE_965(10),
	DEFINEFENCE_965(11),
	DEFINEFENCE_965(12),
	DEFINEFENCE_965(13),
	DEFINEFENCE_965(14),
	DEFINEFENCE_965(15),
};

DEBUGSTRING(ironlake_debug_rr_hw_ctl)
{
	return z_snprintf(result, len, "low %d, high %d", val & RR_HW_LOW_POWER_FRAMES_MASK,
		 (val & RR_HW_HIGH_POWER_FRAMES_MASK) >> 8);
}

DEBUGSTRING(ironlake_debug_m_tu)
{
	return z_snprintf(result, len, "TU %d, val 0x%x %d", (val >> 25) + 1, val & 0xffffff,
		 val & 0xffffff);
}

DEBUGSTRING(ironlake_debug_n)
{
	return z_snprintf(result, len, "val 0x%x %d", val & 0xffffff, val & 0xffffff);
}

DEBUGSTRING(ironlake_debug_fdi_tx_ctl)
{
	const char *train = NULL, *voltage = NULL, *pre_emphasis = NULL, *portw =
	    NULL;

	switch (val & FDI_LINK_TRAIN_NONE) {
	case FDI_LINK_TRAIN_PATTERN_1:
		train = "pattern_1";
		break;
	case FDI_LINK_TRAIN_PATTERN_2:
		train = "pattern_2";
		break;
	case FDI_LINK_TRAIN_PATTERN_IDLE:
		train = "pattern_idle";
		break;
	case FDI_LINK_TRAIN_NONE:
		train = "not train";
		break;
	}

	if (HAS_CPT) {
		/* SNB B0 */
		switch (val & (0x3f << 22)) {
		case FDI_LINK_TRAIN_400MV_0DB_SNB_B:
			voltage = "0.4V";
			pre_emphasis = "0dB";
			break;
		case FDI_LINK_TRAIN_400MV_6DB_SNB_B:
			voltage = "0.4V";
			pre_emphasis = "6dB";
			break;
		case FDI_LINK_TRAIN_600MV_3_5DB_SNB_B:
			voltage = "0.6V";
			pre_emphasis = "3.5dB";
			break;
		case FDI_LINK_TRAIN_800MV_0DB_SNB_B:
			voltage = "0.8V";
			pre_emphasis = "0dB";
			break;
		}

	} else {

		switch (val & (7 << 25)) {
			case FDI_LINK_TRAIN_VOLTAGE_0_4V:
				voltage = "0.4V";
				break;
			case FDI_LINK_TRAIN_VOLTAGE_0_6V:
				voltage = "0.6V";
				break;
			case FDI_LINK_TRAIN_VOLTAGE_0_8V:
				voltage = "0.8V";
				break;
			case FDI_LINK_TRAIN_VOLTAGE_1_2V:
				voltage = "1.2V";
				break;
			default:
				voltage = "reserved";
		}

		switch (val & (7 << 22)) {
			case FDI_LINK_TRAIN_PRE_EMPHASIS_NONE:
				pre_emphasis = "none";
				break;
			case FDI_LINK_TRAIN_PRE_EMPHASIS_1_5X:
				pre_emphasis = "1.5x";
				break;
			case FDI_LINK_TRAIN_PRE_EMPHASIS_2X:
				pre_emphasis = "2x";
				break;
			case FDI_LINK_TRAIN_PRE_EMPHASIS_3X:
				pre_emphasis = "3x";
				break;
			default:
				pre_emphasis = "reserved";
		}

	}

	switch (val & (7 << 19)) {
	case FDI_DP_PORT_WIDTH_X1:
		portw = "X1";
		break;
	case FDI_DP_PORT_WIDTH_X2:
		portw = "X2";
		break;
	case FDI_DP_PORT_WIDTH_X3:
		portw = "X3";
		break;
	case FDI_DP_PORT_WIDTH_X4:
		portw = "X4";
		break;
	}

	return z_snprintf(result, len, "%s, train pattern %s, voltage swing %s,"
		 "pre-emphasis %s, port width %s, enhanced framing %s, FDI PLL %s, scrambing %s, master mode %s",
		 val & FDI_TX_ENABLE ? "enable" : "disable",
		 train, voltage, pre_emphasis, portw,
		 val & FDI_TX_ENHANCE_FRAME_ENABLE ? "enable" :
		 "disable",
		 val & FDI_TX_PLL_ENABLE ? "enable" : "disable",
		 val & (1 << 7) ? "disable" : "enable",
		 val & (1 << 0) ? "enable" : "disable");
}

DEBUGSTRING(ironlake_debug_fdi_rx_ctl)
{
	const char *train = NULL, *portw = NULL, *bpc = NULL;

	if (HAS_CPT) {
		switch (val & FDI_LINK_TRAIN_PATTERN_MASK_CPT) {
		case FDI_LINK_TRAIN_PATTERN_1_CPT:
			train = "pattern_1";
			break;
		case FDI_LINK_TRAIN_PATTERN_2_CPT:
			train = "pattern_2";
			break;
		case FDI_LINK_TRAIN_PATTERN_IDLE_CPT:
			train = "pattern_idle";
			break;
		case FDI_LINK_TRAIN_NORMAL_CPT:
			train = "not train";
			break;
		}
	} else {
		switch (val & FDI_LINK_TRAIN_NONE) {
		case FDI_LINK_TRAIN_PATTERN_1:
			train = "pattern_1";
			break;
		case FDI_LINK_TRAIN_PATTERN_2:
			train = "pattern_2";
			break;
		case FDI_LINK_TRAIN_PATTERN_IDLE:
			train = "pattern_idle";
			break;
		case FDI_LINK_TRAIN_NONE:
			train = "not train";
			break;
		}
	}

	switch (val & (7 << 19)) {
	case FDI_DP_PORT_WIDTH_X1:
		portw = "X1";
		break;
	case FDI_DP_PORT_WIDTH_X2:
		portw = "X2";
		break;
	case FDI_DP_PORT_WIDTH_X3:
		portw = "X3";
		break;
	case FDI_DP_PORT_WIDTH_X4:
		portw = "X4";
		break;
	}

	switch (val & (7 << 16)) {
	case FDI_8BPC:
		bpc = "8bpc";
		break;
	case FDI_10BPC:
		bpc = "10bpc";
		break;
	case FDI_6BPC:
		bpc = "6bpc";
		break;
	case FDI_12BPC:
		bpc = "12bpc";
		break;
	}

	return z_snprintf(result, len, "%s, train pattern %s, port width %s, %s,"
		 "link_reverse_strap_overwrite %s, dmi_link_reverse %s, FDI PLL %s,"
		 "FS ecc %s, FE ecc %s, FS err report %s, FE err report %s,"
		 "scrambing %s, enhanced framing %s, %s",
		 val & FDI_RX_ENABLE ? "enable" : "disable",
		 train, portw, bpc,
		 val & FDI_LINK_REVERSE_OVERWRITE ? "yes" : "no",
		 val & FDI_DMI_LINK_REVERSE_MASK ? "yes" : "no",
		 val & FDI_RX_PLL_ENABLE ? "enable" : "disable",
		 val & FDI_FS_ERR_CORRECT_ENABLE ? "enable" : "disable",
		 val & FDI_FE_ERR_CORRECT_ENABLE ? "enable" : "disable",
		 val & FDI_FS_ERR_REPORT_ENABLE ? "enable" : "disable",
		 val & FDI_FE_ERR_REPORT_ENABLE ? "enable" : "disable",
		 val & (1 << 7) ? "disable" : "enable",
		 val & FDI_RX_ENHANCE_FRAME_ENABLE ? "enable" :
		 "disable", val & FDI_SEL_PCDCLK ? "PCDClk" : "RawClk");
}

DEBUGSTRING(ironlake_debug_dspstride)
{
	return z_snprintf(result, len, "%d", val >> 6);
}

DEBUGSTRING(ironlake_debug_pch_dpll)
{
	const char *enable = val & DPLL_VCO_ENABLE ? "enable" : "disable";
	const char *highspeed = val & DPLL_DVO_HIGH_SPEED ? "yes" : "no";
	const char *mode = NULL;
	const char *p2 = NULL;
	int fpa0_p1, fpa1_p1;
	const char *refclk = NULL;
	int sdvo_mul;

	if ((val & DPLLB_MODE_LVDS) == DPLLB_MODE_LVDS) {
		mode = "LVDS";
		if (val & DPLLB_LVDS_P2_CLOCK_DIV_7)
			p2 = "Div 7";
		else
			p2 = "Div 14";
	} else if ((val & DPLLB_MODE_DAC_SERIAL) == DPLLB_MODE_DAC_SERIAL) {
		mode = "Non-LVDS";
		if (val & DPLL_DAC_SERIAL_P2_CLOCK_DIV_5)
			p2 = "Div 5";
		else
			p2 = "Div 10";
	}
	fpa0_p1 = ffs((val & DPLL_FPA01_P1_POST_DIV_MASK) >> 16);
	fpa1_p1 = ffs((val & DPLL_FPA1_P1_POST_DIV_MASK));

	switch (val & PLL_REF_INPUT_MASK) {
	case PLL_REF_INPUT_DREFCLK:
		refclk = "default 120Mhz";
		break;
	case PLL_REF_INPUT_SUPER_SSC:
		refclk = "SuperSSC 120Mhz";
		break;
	case PLL_REF_INPUT_TVCLKINBC:
		refclk = "SDVO TVClkIn";
		break;
	case PLLB_REF_INPUT_SPREADSPECTRUMIN:
		refclk = "SSC";
		break;
	case PLL_REF_INPUT_DMICLK:
		refclk = "DMI RefCLK";
		break;
	}

	sdvo_mul = ((val & PLL_REF_SDVO_HDMI_MULTIPLIER_MASK) >> 9) + 1;

	return z_snprintf(result, len, "%s, sdvo high speed %s, mode %s, p2 %s, "
		 "FPA0 P1 %d, FPA1 P1 %d, refclk %s, sdvo/hdmi mul %d",
		 enable, highspeed, mode, p2, fpa0_p1, fpa1_p1, refclk,
		 sdvo_mul);
}

DEBUGSTRING(ironlake_debug_dref_ctl)
{
	const char *cpu_source;
	const char *ssc_source = val & DREF_SSC_SOURCE_ENABLE ? "enable" : "disable";
	const char *nonspread_source =
	    val & DREF_NONSPREAD_SOURCE_ENABLE ? "enable" : "disable";
	const char *superspread_source =
	    val & DREF_SUPERSPREAD_SOURCE_ENABLE ? "enable" : "disable";
	const char *ssc4_mode =
	    val & DREF_SSC4_CENTERSPREAD ? "centerspread" : "downspread";
	const char *ssc1 = val & DREF_SSC1_ENABLE ? "enable" : "disable";
	const char *ssc4 = val & DREF_SSC4_ENABLE ? "enable" : "disable";

	switch (val & DREF_CPU_SOURCE_OUTPUT_NONSPREAD) {
	case DREF_CPU_SOURCE_OUTPUT_DISABLE:
		cpu_source = "disable";
		break;
	case DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD:
		cpu_source = "downspread";
		break;
	case DREF_CPU_SOURCE_OUTPUT_NONSPREAD:
		cpu_source = "nonspread";
		break;
	default:
		cpu_source = "reserved";
	}
	return z_snprintf(result, len, "cpu source %s, ssc_source %s, nonspread_source %s, "
		 "superspread_source %s, ssc4_mode %s, ssc1 %s, ssc4 %s",
		 cpu_source, ssc_source, nonspread_source,
		 superspread_source, ssc4_mode, ssc1, ssc4);
}

DEBUGSTRING(ironlake_debug_rawclk_freq)
{
	const char *tp1 = NULL, *tp2 = NULL;

	switch (val & FDL_TP1_TIMER_MASK) {
	case 0:
		tp1 = "0.5us";
		break;
	case (1 << 12):
		tp1 = "1.0us";
		break;
	case (2 << 12):
		tp1 = "2.0us";
		break;
	case (3 << 12):
		tp1 = "4.0us";
		break;
	}
	switch (val & FDL_TP2_TIMER_MASK) {
	case 0:
		tp2 = "1.5us";
		break;
	case (1 << 10):
		tp2 = "3.0us";
		break;
	case (2 << 10):
		tp2 = "6.0us";
		break;
	case (3 << 10):
		tp2 = "12.0us";
		break;
	}
	return z_snprintf(result, len, "FDL_TP1 timer %s, FDL_TP2 timer %s, freq %d",
		 tp1, tp2, val & RAWCLK_FREQ_MASK);

}

DEBUGSTRING(ironlake_debug_fdi_rx_misc)
{
	return z_snprintf(result, len, "FDI Delay %d", val & ((1 << 13) - 1));
}

DEBUGSTRING(ironlake_debug_transconf)
{
	const char *enable = val & TRANS_ENABLE ? "enable" : "disable";
	const char *state = val & TRANS_STATE_ENABLE ? "active" : "inactive";
	const char *interlace;

	switch ((val >> 21) & 7) {
	case 0:
		interlace = "progressive";
		break;
	case 2:
		if (IS_GEN5(devid))
			interlace = "interlaced sdvo";
		else
			interlace = "rsvd";
		break;
	case 3:
		interlace = "interlaced";
		break;
	default:
		interlace = "rsvd";
	}

	return z_snprintf(result, len, "%s, %s, %s", enable, state, interlace);
}

DEBUGSTRING(ironlake_debug_panel_fitting)
{
	const char *vadapt = NULL, *filter_sel = NULL;

	switch (val & (3 << 25)) {
	case 0:
		vadapt = "least";
		break;
	case (1 << 25):
		vadapt = "moderate";
		break;
	case (2 << 25):
		vadapt = "reserved";
		break;
	case (3 << 25):
		vadapt = "most";
		break;
	}

	switch (val & (3 << 23)) {
	case 0:
		filter_sel = "programmed";
		break;
	case (1 << 23):
		filter_sel = "hardcoded";
		break;
	case (2 << 23):
		filter_sel = "edge_enhance";
		break;
	case (3 << 23):
		filter_sel = "edge_soften";
		break;
	}

	return z_snprintf(result, len,
		 "%s, auto_scale %s, auto_scale_cal %s, v_filter %s, vadapt %s, mode %s, filter_sel %s,"
		 "chroma pre-filter %s, vert3tap %s, v_inter_invert %s",
		 val & PF_ENABLE ? "enable" : "disable",
		 val & (1 << 30) ? "no" : "yes",
		 val & (1 << 29) ? "yes" : "no",
		 val & (1 << 28) ? "bypass" : "enable",
		 val & (1 << 27) ? "enable" : "disable",
		 vadapt,
		 filter_sel,
		 val & (1 << 22) ? "enable" : "disable",
		 val & (1 << 21) ? "force" : "auto",
		 val & (1 << 20) ? "field 0" : "field 1");
}

DEBUGSTRING(ironlake_debug_panel_fitting_2)
{
	return z_snprintf(result, len,
		 "vscale %f",
		 val / (float) (1<<15));
}

DEBUGSTRING(ironlake_debug_panel_fitting_3)
{
	return z_snprintf(result, len,
		 "vscale initial phase %f",
		 val / (float) (1<<15));
}

DEBUGSTRING(ironlake_debug_panel_fitting_4)
{
	return z_snprintf(result, len,
		 "hscale %f",
		 val / (float) (1<<15));
}

DEBUGSTRING(ironlake_debug_pf_win)
{
	int a, b;

	a = (val >> 16) & 0x1fff;
	b = val & 0xfff;

	return z_snprintf(result, len, "%d, %d", a, b);
}

DEBUGSTRING(ironlake_debug_hdmi)
{
	int disp_pipe;
	const char *enable, *bpc = NULL, *encoding;
	const char *mode, *audio, *vsync, *hsync, *detect;

	if (val & PORT_ENABLE)
		enable = "enabled";
	else
		enable = "disabled";

	if (HAS_CPT)
		disp_pipe = (val & (3<<29)) >> 29;
	else
		disp_pipe = (val & TRANSCODER_B) >> 29;

	switch (val & (7 << 26)) {
	case COLOR_FORMAT_8bpc:
		bpc = "8bpc";
		break;
	case COLOR_FORMAT_12bpc:
		bpc = "12bpc";
		break;
	}

	if ((val & (3 << 10)) == TMDS_ENCODING)
		encoding = "TMDS";
	else
		encoding = "SDVO";

	if (val & (1 << 9))
		mode = "HDMI";
	else
		mode = "DVI";

	if (val & AUDIO_ENABLE)
		audio = "enabled";
	else
		audio = "disabled";

	if (val & VSYNC_ACTIVE_HIGH)
		vsync = "+vsync";
	else
		vsync = "-vsync";

	if (val & HSYNC_ACTIVE_HIGH)
		hsync = "+hsync";
	else
		hsync = "-hsync";

	if (val & PORT_DETECTED)
		detect = "detected";
	else
		detect = "non-detected";

	return z_snprintf(result, len, "%s pipe %c %s %s %s audio %s %s %s %s",
		 enable, disp_pipe + 'A', bpc, encoding, mode, audio, vsync, hsync, detect);
}

DEBUGSTRING(ironlake_debug_dp_buftrans)
{
	static const char * const reg_names[] = {
		"400mV, 0.0dB",
		"400mV, 3.5dB",
		"400mV, 6.0dB",
		"400mV, 9.5dB",
		"600mV, 0.0dB",
		"600mV, 3.5dB",
		"600mV, 6.0dB",
		"800mV, 0.0dB",
		"800mV, 3.5dB",
		"1200mV, 0.0dB",
	};
	int idx = (reg - DP_BUFTRANS(0)) / 4;

	return z_snprintf(result, len, "%s: OE=%3d, pre-emphasis=%2d, P current drive=%2d, N current drive=%2d",
			  reg_names[idx], (val >> 19) & 0x1ff, (val >> 12) & 0x1f, (val >> 6) & 0xf, val & 0xf);
}

DEBUGSTRING(snb_debug_dpll_sel)
{
	const char *transa, *transb;
	const char *dplla = NULL, *dpllb = NULL;

	if (!HAS_CPT)
		return 0;

	if (val & TRANSA_DPLL_ENABLE) {
		transa = "enable";
		if (val & TRANSA_DPLLB_SEL)
			dplla = "B";
		else
			dplla = "A";
	} else
		transa = "disable";

	if (val & TRANSB_DPLL_ENABLE) {
		transb = "enable";
		if (val & TRANSB_DPLLB_SEL)
			dpllb = "B";
		else
			dpllb = "A";
	} else
		transb = "disable";

	return z_snprintf(result, len, "TransA DPLL %s (DPLL %s), TransB DPLL %s (DPLL %s)",
		 transa, dplla, transb, dpllb);
}

DEBUGSTRING(snb_debug_trans_dp_ctl)
{
	const char *enable, *port = NULL, *bpc = NULL, *vsync, *hsync;

	if (!HAS_CPT)
		return 0;

	if (val & TRANS_DP_OUTPUT_ENABLE)
		enable = "enable";
	else
		enable = "disable";

	switch (val & TRANS_DP_PORT_SEL_MASK) {
	case TRANS_DP_PORT_SEL_B:
		port = "B";
		break;
	case TRANS_DP_PORT_SEL_C:
		port = "C";
		break;
	case TRANS_DP_PORT_SEL_D:
		port = "D";
		break;
	default:
		port = "none";
		break;
	}

	switch (val & (7<<9)) {
	case TRANS_DP_8BPC:
		bpc = "8bpc";
		break;
	case TRANS_DP_10BPC:
		bpc = "10bpc";
		break;
	case TRANS_DP_6BPC:
		bpc = "6bpc";
		break;
	case TRANS_DP_12BPC:
		bpc = "12bpc";
		break;
	}

	if (val & TRANS_DP_VSYNC_ACTIVE_HIGH)
		vsync = "+vsync";
	else
		vsync = "-vsync";

	if (val & TRANS_DP_HSYNC_ACTIVE_HIGH)
		hsync = "+hsync";
	else
		hsync = "-hsync";

	return z_snprintf(result, len, "%s port %s %s %s %s",
		 enable, port, bpc, vsync, hsync);
}

DEBUGSTRING(ilk_debug_pp_control)
{
	return z_snprintf(result, len, "blacklight %s, %spower down on reset, panel %s",
		 (val & (1 << 2)) ? "enabled" : "disabled",
		 (val & (1 << 1)) ? "" : "do not ",
		 (val & (1 << 0)) ? "on" : "off");
}

DEBUGSTRING(hsw_debug_port_clk_sel)
{
	const char *clock = NULL;

	switch ((val >> 29 ) & 7) {
	case 0:
		clock = "LCPLL 2700";
		break;
	case 1:
		clock = "LCPLL 1350";
		break;
	case 2:
		clock = "LCPLL 810";
		break;
	case 3:
		clock = "SPLL";
		break;
	case 4:
		clock = "WRPLL 1";
		break;
	case 5:
		clock = "WRPLL 2";
		break;
	case 6:
		clock = "Reserved";
		break;
	case 7:
		clock = "None";
		break;
	}

	return z_snprintf(result, len, "%s", clock);
}

DEBUGSTRING(hsw_debug_pipe_clk_sel)
{
	const char *clock;

	switch ((val >> 29) & 7) {
	case 0:
		clock = "None";
		break;
	case 2:
		clock = "DDIB";
		break;
	case 3:
		clock = "DDIC";
		break;
	case 4:
		clock = "DDID";
		break;
	case 5:
		clock = "DDIE";
		break;
	default:
		clock = "Reserved";
		break;
	}

	return z_snprintf(result, len, "%s", clock);
}

DEBUGSTRING(hsw_debug_ddi_buf_ctl)
{
	const char *enable, *reversal, *width, *detected;

	enable = (val & (1<<31)) ? "enabled" : "disabled";
	reversal = (val & (1<<16)) ? "reversed" : "not reversed";

	switch ((val >> 1) & 7) {
	case 0:
		width = "x1";
		break;
	case 1:
		width = "x2";
		break;
	case 3:
		width = "x4";
		break;
	default:
		width = "reserved";
		break;
	}

	detected = (val & 1) ? "detected" : "not detected";

	return z_snprintf(result, len, "%s %s %s %s", enable, reversal, width, detected);
}

DEBUGSTRING(hsw_debug_sfuse_strap)
{
	const char *display, *crt, *lane_reversal, *portb, *portc, *portd;

	display = (val & (1<<7)) ? "disabled" : "enabled";
	crt = (val & (1<<6)) ? "yes" : "no";
	lane_reversal = (val & (1<<4)) ? "yes" : "no";
	portb = (val & (1<<2)) ? "yes" : "no";
	portc = (val & (1<<1)) ? "yes" : "no";
	portd = (val & (1<<0)) ? "yes" : "no";

	return z_snprintf(result, len, "display %s, crt %s, lane reversal %s, "
		 "port b %s, port c %s, port d %s", display, crt, lane_reversal,
		 portb, portc, portd);
}

DEBUGSTRING(hsw_debug_pipe_ddi_func_ctl)
{
	const char *enable, *port, *mode, *bpc, *vsync, *hsync, *edp_input;
	const char *width;

	enable = (val & (1<<31)) ? "enabled" : "disabled";

	switch ((val >> 28) & 7) {
	case 0:
		port = "no port";
		break;
	case 1:
		port = "DDIB";
		break;
	case 2:
		port = "DDIC";
		break;
	case 3:
		port = "DDID";
		break;
	case 4:
		port = "DDIE";
		break;
	default:
		port = "port reserved";
		break;
	}

	switch ((val >> 24) & 7) {
	case 0:
		mode = "HDMI";
		break;
	case 1:
		mode = "DVI";
		break;
	case 2:
		mode = "DP SST";
		break;
	case 3:
		mode = "DP MST";
		break;
	case 4:
		mode = "FDI";
		break;
	case 5:
	default:
		mode = "mode reserved";
		break;
	}

	switch ((val >> 20) & 7) {
	case 0:
		bpc = "8 bpc";
		break;
	case 1:
		bpc = "10 bpc";
		break;
	case 2:
		bpc = "6 bpc";
		break;
	case 3:
		bpc = "12 bpc";
		break;
	default:
		bpc = "bpc reserved";
		break;
	}

	hsync = (val & (1<<16)) ? "+HSync" : "-HSync";
	vsync = (val & (1<<17)) ? "+VSync" : "-VSync";

	switch ((val >> 12) & 7) {
	case 0:
		edp_input = "EDP A ON";
		break;
	case 4:
		edp_input = "EDP A ONOFF";
		break;
	case 5:
		edp_input = "EDP B ONOFF";
		break;
	case 6:
		edp_input = "EDP C ONOFF";
		break;
	default:
		edp_input = "EDP input reserved";
		break;
	}

	switch ((val >> 1) & 7) {
	case 0:
		width = "x1";
		break;
	case 1:
		width = "x2";
		break;
	case 3:
		width = "x4";
		break;
	default:
		width = "reserved width";
		break;
	}

	return z_snprintf(result, len, "%s, %s, %s, %s, %s, %s, %s, %s", enable,
		 port, mode, bpc, vsync, hsync, edp_input, width);
}

DEBUGSTRING(hsw_debug_wm_pipe)
{
	uint32_t primary, sprite, cursor;

	primary = (val >> 16) & 0x7F;
	sprite = (val >> 8) & 0x7F;
	cursor = val & 0x3F;

	return z_snprintf(result, len, "primary %d, sprite %d, pipe %d", primary,
		 sprite, cursor);
}

DEBUGSTRING(hsw_debug_lp_wm)
{
	const char *enable;
	uint32_t latency, fbc, pri, cur;

	enable = ((val >> 31) & 1) ? "enabled" : "disabled";
	latency = (val >> 24) & 0x7F;
	fbc = (val >> 20) & 0xF;
	pri = (val >> 8) & 0x3FF;
	cur = val & 0xFF;

	return z_snprintf(result, len, "%s, latency %d, fbc %d, pri %d, cur %d",
		 enable, latency, fbc, pri, cur);
}

DEBUGSTRING(hsw_debug_sinterrupt)
{
	int portd, portc, portb, crt;

	portd = (val >> 23) & 1;
	portc = (val >> 22) & 1;
	portb = (val >> 21) & 1;
	crt = (val >> 19) & 1;

	return z_snprintf(result, len, "port d:%d, port c:%d, port b:%d, crt:%d",
		 portd, portc, portb, crt);
}

DEBUGSTRING(ilk_debug_blc_pwm_cpu_ctl2)
{
	int enable, blinking, granularity;
	const char *pipe;

	enable = (val >> 31) & 1;

	if (IS_GEN5(devid) || IS_GEN6(devid)) {
		pipe = ((val >> 29) & 1) ? "B" : "A";
	} else {
		switch ((val >> 29) & 3) {
		case 0:
			pipe = "A";
			break;
		case 1:
			pipe = "B";
			break;
		case 2:
			pipe = "C";
			break;
		case 3:
			if (IS_IVYBRIDGE(devid))
				pipe = "reserved";
			else
				pipe = "EDP";
			break;
		}
	}

	if (IS_GEN5(devid) || IS_GEN6(devid) || IS_IVYBRIDGE(devid)) {
		return z_snprintf(result, len, "enable %d, pipe %s", enable, pipe);
	} else {
		blinking = (val >> 28) & 1;
		granularity = ((val >> 27) & 1) ? 8 : 128;

		return z_snprintf(result, len, "enable %d, pipe %s, blinking %d, "
			 "granularity %d", enable, pipe, blinking,
			 granularity);
	}
}

DEBUGSTRING(ilk_debug_blc_pwm_cpu_ctl)
{
	int cycle, freq;

	cycle = (val & 0xFFFF);

	if (IS_GEN5(devid) || IS_GEN6(devid) || IS_IVYBRIDGE(devid)) {
		return z_snprintf(result, len, "cycle %d", cycle);
	} else {
		freq = (val >> 16) & 0xFFFF;

		return z_snprintf(result, len, "cycle %d, freq %d", cycle, freq);
	}
}

DEBUGSTRING(ibx_debug_blc_pwm_ctl1)
{
	int enable, override, inverted_polarity;

	enable = (val >> 31) & 1;
	override = (val >> 30) & 1;
	inverted_polarity = (val >> 29) & 1;

	return z_snprintf(result, len, "enable %d, override %d, inverted polarity %d",
		 enable, override, inverted_polarity);
}

DEBUGSTRING(ibx_debug_blc_pwm_ctl2)
{
	int freq, cycle;

	freq = (val >> 16) & 0xFFFF;
	cycle = val & 0xFFFF;

	return z_snprintf(result, len, "freq %d, cycle %d", freq, cycle);
}

DEBUGSTRING(hsw_debug_blc_misc_ctl)
{
	const char *sel;

	sel = (val & 1) ? "PWM1-CPU PWM2-PCH" : "PWM1-PCH PWM2-CPU";

	return z_snprintf(result, len, "%s", sel);
}

DEBUGSTRING(hsw_debug_util_pin_ctl)
{
	int enable, data, inverted_polarity;
	const char *transcoder, *mode;

	enable = (val >> 31) & 1;

	switch ((val >> 29) & 3) {
	case 0:
		transcoder = "A";
		break;
	case 1:
		transcoder = "B";
		break;
	case 2:
		transcoder = "C";
		break;
	case 3:
		transcoder = "EDP";
		break;
	}

	switch ((val >> 24) & 0xF) {
	case 0:
		mode = "data";
		break;
	case 1:
		mode = "PWM";
		break;
	case 4:
		mode = "Vblank";
		break;
	case 5:
		mode = "Vsync";
		break;
	default:
		mode = "reserved";
		break;
	}

	data = (val >> 23) & 1;
	inverted_polarity = (val >> 22) & 1;

	return z_snprintf(result, len, "enable %d, transcoder %s, mode %s, data %d "
		 "inverted polarity %d", enable, transcoder, mode, data,
		 inverted_polarity);
}

static const struct reg_debug gen6_fences[] = {
#define DEFINEFENCE_SNB(i) \
	{ FENCE_REG_SANDYBRIDGE_0 + (i) * 8, "FENCE START "#i, NULL }, \
	{ FENCE_REG_SANDYBRIDGE_0 + (i) * 8 + 4, "FENCE END "#i, NULL }
	DEFINEFENCE_SNB(0),
	DEFINEFENCE_SNB(1),
	DEFINEFENCE_SNB(2),
	DEFINEFENCE_SNB(3),
	DEFINEFENCE_SNB(4),
	DEFINEFENCE_SNB(5),
	DEFINEFENCE_SNB(6),
	DEFINEFENCE_SNB(7),
	DEFINEFENCE_SNB(8),
	DEFINEFENCE_SNB(9),
	DEFINEFENCE_SNB(10),
	DEFINEFENCE_SNB(11),
	DEFINEFENCE_SNB(12),
	DEFINEFENCE_SNB(13),
	DEFINEFENCE_SNB(14),
	DEFINEFENCE_SNB(15),
	DEFINEFENCE_SNB(16),
	DEFINEFENCE_SNB(17),
	DEFINEFENCE_SNB(18),
	DEFINEFENCE_SNB(19),
	DEFINEFENCE_SNB(20),
	DEFINEFENCE_SNB(20),
	DEFINEFENCE_SNB(21),
	DEFINEFENCE_SNB(22),
	DEFINEFENCE_SNB(23),
	DEFINEFENCE_SNB(24),
	DEFINEFENCE_SNB(25),
	DEFINEFENCE_SNB(26),
	DEFINEFENCE_SNB(27),
	DEFINEFENCE_SNB(28),
	DEFINEFENCE_SNB(29),
	DEFINEFENCE_SNB(30),
	DEFINEFENCE_SNB(31),
};

static const struct reg_debug ironlake_debug_regs[] = {
	DEFINEREG(PGETBL_CTL),
	DEFINEREG(INSTDONE_I965),
	DEFINEREG(INSTDONE_1),
	DEFINEREG2(CPU_VGACNTRL, i830_debug_vgacntrl),
	DEFINEREG(DIGITAL_PORT_HOTPLUG_CNTRL),

	DEFINEREG2(RR_HW_CTL, ironlake_debug_rr_hw_ctl),

	DEFINEREG(FDI_PLL_BIOS_0),
	DEFINEREG(FDI_PLL_BIOS_1),
	DEFINEREG(FDI_PLL_BIOS_2),

	DEFINEREG(DISPLAY_PORT_PLL_BIOS_0),
	DEFINEREG(DISPLAY_PORT_PLL_BIOS_1),
	DEFINEREG(DISPLAY_PORT_PLL_BIOS_2),

	DEFINEREG(FDI_PLL_FREQ_CTL),

	/* pipe B */

	DEFINEREG2(PIPEACONF, i830_debug_pipeconf),

	DEFINEREG2(HTOTAL_A, i830_debug_hvtotal),
	DEFINEREG2(HBLANK_A, i830_debug_hvsyncblank),
	DEFINEREG2(HSYNC_A, i830_debug_hvsyncblank),
	DEFINEREG2(VTOTAL_A, i830_debug_hvtotal),
	DEFINEREG2(VBLANK_A, i830_debug_hvsyncblank),
	DEFINEREG2(VSYNC_A, i830_debug_hvsyncblank),
	DEFINEREG(VSYNCSHIFT_A),
	DEFINEREG2(PIPEASRC, i830_debug_yxminus1),

	DEFINEREG2(PIPEA_DATA_M1, ironlake_debug_m_tu),
	DEFINEREG2(PIPEA_DATA_N1, ironlake_debug_n),
	DEFINEREG2(PIPEA_DATA_M2, ironlake_debug_m_tu),
	DEFINEREG2(PIPEA_DATA_N2, ironlake_debug_n),

	DEFINEREG2(PIPEA_LINK_M1, ironlake_debug_n),
	DEFINEREG2(PIPEA_LINK_N1, ironlake_debug_n),
	DEFINEREG2(PIPEA_LINK_M2, ironlake_debug_n),
	DEFINEREG2(PIPEA_LINK_N2, ironlake_debug_n),

	DEFINEREG2(DSPACNTR, i830_debug_dspcntr),
	DEFINEREG(DSPABASE),
	DEFINEREG2(DSPASTRIDE, ironlake_debug_dspstride),
	DEFINEREG(DSPASURF),
	DEFINEREG2(DSPATILEOFF, i830_debug_xy),

	/* pipe B */

	DEFINEREG2(PIPEBCONF, i830_debug_pipeconf),

	DEFINEREG2(HTOTAL_B, i830_debug_hvtotal),
	DEFINEREG2(HBLANK_B, i830_debug_hvsyncblank),
	DEFINEREG2(HSYNC_B, i830_debug_hvsyncblank),
	DEFINEREG2(VTOTAL_B, i830_debug_hvtotal),
	DEFINEREG2(VBLANK_B, i830_debug_hvsyncblank),
	DEFINEREG2(VSYNC_B, i830_debug_hvsyncblank),
	DEFINEREG(VSYNCSHIFT_B),
	DEFINEREG2(PIPEBSRC, i830_debug_yxminus1),

	DEFINEREG2(PIPEB_DATA_M1, ironlake_debug_m_tu),
	DEFINEREG2(PIPEB_DATA_N1, ironlake_debug_n),
	DEFINEREG2(PIPEB_DATA_M2, ironlake_debug_m_tu),
	DEFINEREG2(PIPEB_DATA_N2, ironlake_debug_n),

	DEFINEREG2(PIPEB_LINK_M1, ironlake_debug_n),
	DEFINEREG2(PIPEB_LINK_N1, ironlake_debug_n),
	DEFINEREG2(PIPEB_LINK_M2, ironlake_debug_n),
	DEFINEREG2(PIPEB_LINK_N2, ironlake_debug_n),

	DEFINEREG2(DSPBCNTR, i830_debug_dspcntr),
	DEFINEREG(DSPBBASE),
	DEFINEREG2(DSPBSTRIDE, ironlake_debug_dspstride),
	DEFINEREG(DSPBSURF),
	DEFINEREG2(DSPBTILEOFF, i830_debug_xy),

	/* pipe C */

	DEFINEREG2(PIPECCONF, i830_debug_pipeconf),

	DEFINEREG2(HTOTAL_C, i830_debug_hvtotal),
	DEFINEREG2(HBLANK_C, i830_debug_hvsyncblank),
	DEFINEREG2(HSYNC_C, i830_debug_hvsyncblank),
	DEFINEREG2(VTOTAL_C, i830_debug_hvtotal),
	DEFINEREG2(VBLANK_C, i830_debug_hvsyncblank),
	DEFINEREG2(VSYNC_C, i830_debug_hvsyncblank),
	DEFINEREG(VSYNCSHIFT_C),
	DEFINEREG2(PIPECSRC, i830_debug_yxminus1),

	DEFINEREG2(PIPEC_DATA_M1, ironlake_debug_m_tu),
	DEFINEREG2(PIPEC_DATA_N1, ironlake_debug_n),
	DEFINEREG2(PIPEC_DATA_M2, ironlake_debug_m_tu),
	DEFINEREG2(PIPEC_DATA_N2, ironlake_debug_n),

	DEFINEREG2(PIPEC_LINK_M1, ironlake_debug_n),
	DEFINEREG2(PIPEC_LINK_N1, ironlake_debug_n),
	DEFINEREG2(PIPEC_LINK_M2, ironlake_debug_n),
	DEFINEREG2(PIPEC_LINK_N2, ironlake_debug_n),

	DEFINEREG2(DSPCCNTR, i830_debug_dspcntr),
	DEFINEREG(DSPCBASE),
	DEFINEREG2(DSPCSTRIDE, ironlake_debug_dspstride),
	DEFINEREG(DSPCSURF),
	DEFINEREG2(DSPCTILEOFF, i830_debug_xy),

	/* Panel fitter */

	DEFINEREG2(PFA_CTL_1, ironlake_debug_panel_fitting),
	DEFINEREG2(PFA_CTL_2, ironlake_debug_panel_fitting_2),
	DEFINEREG2(PFA_CTL_3, ironlake_debug_panel_fitting_3),
	DEFINEREG2(PFA_CTL_4, ironlake_debug_panel_fitting_4),
	DEFINEREG2(PFA_WIN_POS, ironlake_debug_pf_win),
	DEFINEREG2(PFA_WIN_SIZE, ironlake_debug_pf_win),
	DEFINEREG2(PFB_CTL_1, ironlake_debug_panel_fitting),
	DEFINEREG2(PFB_CTL_2, ironlake_debug_panel_fitting_2),
	DEFINEREG2(PFB_CTL_3, ironlake_debug_panel_fitting_3),
	DEFINEREG2(PFB_CTL_4, ironlake_debug_panel_fitting_4),
	DEFINEREG2(PFB_WIN_POS, ironlake_debug_pf_win),
	DEFINEREG2(PFB_WIN_SIZE, ironlake_debug_pf_win),
	DEFINEREG2(PFC_CTL_1, ironlake_debug_panel_fitting),
	DEFINEREG2(PFC_CTL_2, ironlake_debug_panel_fitting_2),
	DEFINEREG2(PFC_CTL_3, ironlake_debug_panel_fitting_3),
	DEFINEREG2(PFC_CTL_4, ironlake_debug_panel_fitting_4),
	DEFINEREG2(PFC_WIN_POS, ironlake_debug_pf_win),
	DEFINEREG2(PFC_WIN_SIZE, ironlake_debug_pf_win),

	/* PCH */

	DEFINEREG2(PCH_DREF_CONTROL, ironlake_debug_dref_ctl),
	DEFINEREG2(PCH_RAWCLK_FREQ, ironlake_debug_rawclk_freq),
	DEFINEREG(PCH_DPLL_TMR_CFG),
	DEFINEREG(PCH_SSC4_PARMS),
	DEFINEREG(PCH_SSC4_AUX_PARMS),
	DEFINEREG2(PCH_DPLL_SEL, snb_debug_dpll_sel),
	DEFINEREG(PCH_DPLL_ANALOG_CTL),

	DEFINEREG2(PCH_DPLL_A, ironlake_debug_pch_dpll),
	DEFINEREG2(PCH_DPLL_B, ironlake_debug_pch_dpll),
	DEFINEREG2(PCH_FPA0, i830_debug_fp),
	DEFINEREG2(PCH_FPA1, i830_debug_fp),
	DEFINEREG2(PCH_FPB0, i830_debug_fp),
	DEFINEREG2(PCH_FPB1, i830_debug_fp),

	DEFINEREG2(TRANS_HTOTAL_A, i830_debug_hvtotal),
	DEFINEREG2(TRANS_HBLANK_A, i830_debug_hvsyncblank),
	DEFINEREG2(TRANS_HSYNC_A, i830_debug_hvsyncblank),
	DEFINEREG2(TRANS_VTOTAL_A, i830_debug_hvtotal),
	DEFINEREG2(TRANS_VBLANK_A, i830_debug_hvsyncblank),
	DEFINEREG2(TRANS_VSYNC_A, i830_debug_hvsyncblank),
	DEFINEREG(TRANS_VSYNCSHIFT_A),

	DEFINEREG2(TRANSA_DATA_M1, ironlake_debug_m_tu),
	DEFINEREG2(TRANSA_DATA_N1, ironlake_debug_n),
	DEFINEREG2(TRANSA_DATA_M2, ironlake_debug_m_tu),
	DEFINEREG2(TRANSA_DATA_N2, ironlake_debug_n),
	DEFINEREG2(TRANSA_DP_LINK_M1, ironlake_debug_n),
	DEFINEREG2(TRANSA_DP_LINK_N1, ironlake_debug_n),
	DEFINEREG2(TRANSA_DP_LINK_M2, ironlake_debug_n),
	DEFINEREG2(TRANSA_DP_LINK_N2, ironlake_debug_n),

	DEFINEREG2(TRANS_HTOTAL_B, i830_debug_hvtotal),
	DEFINEREG2(TRANS_HBLANK_B, i830_debug_hvsyncblank),
	DEFINEREG2(TRANS_HSYNC_B, i830_debug_hvsyncblank),
	DEFINEREG2(TRANS_VTOTAL_B, i830_debug_hvtotal),
	DEFINEREG2(TRANS_VBLANK_B, i830_debug_hvsyncblank),
	DEFINEREG2(TRANS_VSYNC_B, i830_debug_hvsyncblank),
	DEFINEREG(TRANS_VSYNCSHIFT_B),

	DEFINEREG2(TRANSB_DATA_M1, ironlake_debug_m_tu),
	DEFINEREG2(TRANSB_DATA_N1, ironlake_debug_n),
	DEFINEREG2(TRANSB_DATA_M2, ironlake_debug_m_tu),
	DEFINEREG2(TRANSB_DATA_N2, ironlake_debug_n),
	DEFINEREG2(TRANSB_DP_LINK_M1, ironlake_debug_n),
	DEFINEREG2(TRANSB_DP_LINK_N1, ironlake_debug_n),
	DEFINEREG2(TRANSB_DP_LINK_M2, ironlake_debug_n),
	DEFINEREG2(TRANSB_DP_LINK_N2, ironlake_debug_n),

	DEFINEREG2(TRANS_HTOTAL_C, i830_debug_hvtotal),
	DEFINEREG2(TRANS_HBLANK_C, i830_debug_hvsyncblank),
	DEFINEREG2(TRANS_HSYNC_C, i830_debug_hvsyncblank),
	DEFINEREG2(TRANS_VTOTAL_C, i830_debug_hvtotal),
	DEFINEREG2(TRANS_VBLANK_C, i830_debug_hvsyncblank),
	DEFINEREG2(TRANS_VSYNC_C, i830_debug_hvsyncblank),
	DEFINEREG(TRANS_VSYNCSHIFT_C),

	DEFINEREG2(TRANSC_DATA_M1, ironlake_debug_m_tu),
	DEFINEREG2(TRANSC_DATA_N1, ironlake_debug_n),
	DEFINEREG2(TRANSC_DATA_M2, ironlake_debug_m_tu),
	DEFINEREG2(TRANSC_DATA_N2, ironlake_debug_n),
	DEFINEREG2(TRANSC_DP_LINK_M1, ironlake_debug_n),
	DEFINEREG2(TRANSC_DP_LINK_N1, ironlake_debug_n),
	DEFINEREG2(TRANSC_DP_LINK_M2, ironlake_debug_n),
	DEFINEREG2(TRANSC_DP_LINK_N2, ironlake_debug_n),

	DEFINEREG2(TRANSACONF, ironlake_debug_transconf),
	DEFINEREG2(TRANSBCONF, ironlake_debug_transconf),
	DEFINEREG2(TRANSCCONF, ironlake_debug_transconf),

	DEFINEREG2(FDI_TXA_CTL, ironlake_debug_fdi_tx_ctl),
	DEFINEREG2(FDI_TXB_CTL, ironlake_debug_fdi_tx_ctl),
	DEFINEREG2(FDI_TXC_CTL, ironlake_debug_fdi_tx_ctl),
	DEFINEREG2(FDI_RXA_CTL, ironlake_debug_fdi_rx_ctl),
	DEFINEREG2(FDI_RXB_CTL, ironlake_debug_fdi_rx_ctl),
	DEFINEREG2(FDI_RXC_CTL, ironlake_debug_fdi_rx_ctl),

	DEFINEREG(DPAFE_BMFUNC),
	DEFINEREG(DPAFE_DL_IREFCAL0),
	DEFINEREG(DPAFE_DL_IREFCAL1),
	DEFINEREG(DPAFE_DP_IREFCAL),

	DEFINEREG(PCH_DSPCLK_GATE_D),
	DEFINEREG(PCH_DSP_CHICKEN1),
	DEFINEREG(PCH_DSP_CHICKEN2),
	DEFINEREG(PCH_DSP_CHICKEN3),

	DEFINEREG2(FDI_RXA_MISC, ironlake_debug_fdi_rx_misc),
	DEFINEREG2(FDI_RXB_MISC, ironlake_debug_fdi_rx_misc),
	DEFINEREG2(FDI_RXC_MISC, ironlake_debug_fdi_rx_misc),
	DEFINEREG(FDI_RXA_TUSIZE1),
	DEFINEREG(FDI_RXA_TUSIZE2),
	DEFINEREG(FDI_RXB_TUSIZE1),
	DEFINEREG(FDI_RXB_TUSIZE2),
	DEFINEREG(FDI_RXC_TUSIZE1),
	DEFINEREG(FDI_RXC_TUSIZE2),

	DEFINEREG(FDI_PLL_CTL_1),
	DEFINEREG(FDI_PLL_CTL_2),

	DEFINEREG(FDI_RXA_IIR),
	DEFINEREG(FDI_RXA_IMR),
	DEFINEREG(FDI_RXB_IIR),
	DEFINEREG(FDI_RXB_IMR),

	DEFINEREG2(PCH_ADPA, i830_debug_adpa),
	DEFINEREG2(HDMIB, ironlake_debug_hdmi),
	DEFINEREG2(HDMIC, ironlake_debug_hdmi),
	DEFINEREG2(HDMID, ironlake_debug_hdmi),
	DEFINEREG2(PCH_LVDS, i830_debug_lvds),
	DEFINEREG(CPU_eDP_A),
	DEFINEREG(PCH_DP_B),
	DEFINEREG(PCH_DP_C),
	DEFINEREG(PCH_DP_D),

	DEFINEREG2(DP_BUFTRANS(0), ironlake_debug_dp_buftrans),
	DEFINEREG2(DP_BUFTRANS(1), ironlake_debug_dp_buftrans),
	DEFINEREG2(DP_BUFTRANS(2), ironlake_debug_dp_buftrans),
	DEFINEREG2(DP_BUFTRANS(3), ironlake_debug_dp_buftrans),
	DEFINEREG2(DP_BUFTRANS(4), ironlake_debug_dp_buftrans),
	DEFINEREG2(DP_BUFTRANS(5), ironlake_debug_dp_buftrans),
	DEFINEREG2(DP_BUFTRANS(6), ironlake_debug_dp_buftrans),
	DEFINEREG2(DP_BUFTRANS(7), ironlake_debug_dp_buftrans),
	DEFINEREG2(DP_BUFTRANS(8), ironlake_debug_dp_buftrans),
	DEFINEREG2(DP_BUFTRANS(9), ironlake_debug_dp_buftrans),

	DEFINEREG2(TRANS_DP_CTL_A, snb_debug_trans_dp_ctl),
	DEFINEREG2(TRANS_DP_CTL_B, snb_debug_trans_dp_ctl),
	DEFINEREG2(TRANS_DP_CTL_C, snb_debug_trans_dp_ctl),

	DEFINEREG2(BLC_PWM_CPU_CTL2, ilk_debug_blc_pwm_cpu_ctl2),
	DEFINEREG2(BLC_PWM_CPU_CTL, ilk_debug_blc_pwm_cpu_ctl),
	DEFINEREG2(BLC_PWM_PCH_CTL1, ibx_debug_blc_pwm_ctl1),
	DEFINEREG2(BLC_PWM_PCH_CTL2, ibx_debug_blc_pwm_ctl2),

	DEFINEREG2(PCH_PP_STATUS, i830_debug_pp_status),
	DEFINEREG2(PCH_PP_CONTROL, ilk_debug_pp_control),
	DEFINEREG(PCH_PP_ON_DELAYS),
	DEFINEREG(PCH_PP_OFF_DELAYS),
	DEFINEREG(PCH_PP_DIVISOR),

	DEFINEREG2(PORT_DBG, ivb_debug_port),

	DEFINEREG(RC6_RESIDENCY_TIME),
	DEFINEREG(RC6p_RESIDENCY_TIME),
	DEFINEREG(RC6pp_RESIDENCY_TIME),
};

static const struct reg_debug haswell_debug_regs[] = {
	/* Power wells */
	DEFINEREG(HSW_PWR_WELL_CTL1),
	DEFINEREG(HSW_PWR_WELL_CTL2),
	DEFINEREG(HSW_PWR_WELL_CTL3),
	DEFINEREG(HSW_PWR_WELL_CTL4),
	DEFINEREG(HSW_PWR_WELL_CTL5),
	DEFINEREG(HSW_PWR_WELL_CTL6),

	/* DDI pipe function */
	DEFINEREG2(PIPE_DDI_FUNC_CTL_A, hsw_debug_pipe_ddi_func_ctl),
	DEFINEREG2(PIPE_DDI_FUNC_CTL_B, hsw_debug_pipe_ddi_func_ctl),
	DEFINEREG2(PIPE_DDI_FUNC_CTL_C, hsw_debug_pipe_ddi_func_ctl),
	DEFINEREG2(PIPE_DDI_FUNC_CTL_EDP, hsw_debug_pipe_ddi_func_ctl),

	/* DP transport control */
	DEFINEREG(DP_TP_CTL_A),
	DEFINEREG(DP_TP_CTL_B),
	DEFINEREG(DP_TP_CTL_C),
	DEFINEREG(DP_TP_CTL_D),
	DEFINEREG(DP_TP_CTL_E),

	/* DP status */
	DEFINEREG(DP_TP_STATUS_B),
	DEFINEREG(DP_TP_STATUS_C),
	DEFINEREG(DP_TP_STATUS_D),
	DEFINEREG(DP_TP_STATUS_E),

	/* DDI buffer control */
	DEFINEREG2(DDI_BUF_CTL_A, hsw_debug_ddi_buf_ctl),
	DEFINEREG2(DDI_BUF_CTL_B, hsw_debug_ddi_buf_ctl),
	DEFINEREG2(DDI_BUF_CTL_C, hsw_debug_ddi_buf_ctl),
	DEFINEREG2(DDI_BUF_CTL_D, hsw_debug_ddi_buf_ctl),
	DEFINEREG2(DDI_BUF_CTL_E, hsw_debug_ddi_buf_ctl),

	/* Clocks */
	DEFINEREG(SPLL_CTL),
	DEFINEREG(LCPLL_CTL),
	DEFINEREG(WRPLL_CTL1),
	DEFINEREG(WRPLL_CTL2),

	/* DDI port clock control */
	DEFINEREG2(PORT_CLK_SEL_A, hsw_debug_port_clk_sel),
	DEFINEREG2(PORT_CLK_SEL_B, hsw_debug_port_clk_sel),
	DEFINEREG2(PORT_CLK_SEL_C, hsw_debug_port_clk_sel),
	DEFINEREG2(PORT_CLK_SEL_D, hsw_debug_port_clk_sel),
	DEFINEREG2(PORT_CLK_SEL_E, hsw_debug_port_clk_sel),

	/* Pipe clock control */
	DEFINEREG2(PIPE_CLK_SEL_A, hsw_debug_pipe_clk_sel),
	DEFINEREG2(PIPE_CLK_SEL_B, hsw_debug_pipe_clk_sel),
	DEFINEREG2(PIPE_CLK_SEL_C, hsw_debug_pipe_clk_sel),

	/* Watermarks */
	DEFINEREG2(WM_PIPE_A, hsw_debug_wm_pipe),
	DEFINEREG2(WM_PIPE_B, hsw_debug_wm_pipe),
	DEFINEREG2(WM_PIPE_C, hsw_debug_wm_pipe),
	DEFINEREG2(WM_LP1, hsw_debug_lp_wm),
	DEFINEREG2(WM_LP2, hsw_debug_lp_wm),
	DEFINEREG2(WM_LP3, hsw_debug_lp_wm),
	DEFINEREG(WM_LP1_SPR),
	DEFINEREG(WM_LP2_SPR),
	DEFINEREG(WM_LP3_SPR),
	DEFINEREG(WM_MISC),
	DEFINEREG(WM_SR_CNT),
	DEFINEREG(PIPE_WM_LINETIME_A),
	DEFINEREG(PIPE_WM_LINETIME_B),
	DEFINEREG(PIPE_WM_LINETIME_C),
	DEFINEREG(WM_DBG),

	/* Fuses */
	DEFINEREG2(SFUSE_STRAP, hsw_debug_sfuse_strap),

	/* Pipe A */
	DEFINEREG2(PIPEASRC, i830_debug_yxminus1),
	DEFINEREG2(DSPACNTR, i830_debug_dspcntr),
	DEFINEREG2(DSPASTRIDE, ironlake_debug_dspstride),
	DEFINEREG(DSPASURF),
	DEFINEREG2(DSPATILEOFF, i830_debug_xy),

	/* Pipe B */
	DEFINEREG2(PIPEBSRC, i830_debug_yxminus1),
	DEFINEREG2(DSPBCNTR, i830_debug_dspcntr),
	DEFINEREG2(DSPBSTRIDE, ironlake_debug_dspstride),
	DEFINEREG(DSPBSURF),
	DEFINEREG2(DSPBTILEOFF, i830_debug_xy),

	/* Pipe C */
	DEFINEREG2(PIPECSRC, i830_debug_yxminus1),
	DEFINEREG2(DSPCCNTR, i830_debug_dspcntr),
	DEFINEREG2(DSPCSTRIDE, ironlake_debug_dspstride),
	DEFINEREG(DSPCSURF),
	DEFINEREG2(DSPCTILEOFF, i830_debug_xy),

	/* Transcoder A */
	DEFINEREG2(PIPEACONF, i830_debug_pipeconf),
	DEFINEREG2(HTOTAL_A, i830_debug_hvtotal),
	DEFINEREG2(HBLANK_A, i830_debug_hvsyncblank),
	DEFINEREG2(HSYNC_A, i830_debug_hvsyncblank),
	DEFINEREG2(VTOTAL_A, i830_debug_hvtotal),
	DEFINEREG2(VBLANK_A, i830_debug_hvsyncblank),
	DEFINEREG2(VSYNC_A, i830_debug_hvsyncblank),
	DEFINEREG(VSYNCSHIFT_A),
	DEFINEREG2(PIPEA_DATA_M1, ironlake_debug_m_tu),
	DEFINEREG2(PIPEA_DATA_N1, ironlake_debug_n),
	DEFINEREG2(PIPEA_LINK_M1, ironlake_debug_n),
	DEFINEREG2(PIPEA_LINK_N1, ironlake_debug_n),

	/* Transcoder B */
	DEFINEREG2(PIPEBCONF, i830_debug_pipeconf),
	DEFINEREG2(HTOTAL_B, i830_debug_hvtotal),
	DEFINEREG2(HBLANK_B, i830_debug_hvsyncblank),
	DEFINEREG2(HSYNC_B, i830_debug_hvsyncblank),
	DEFINEREG2(VTOTAL_B, i830_debug_hvtotal),
	DEFINEREG2(VBLANK_B, i830_debug_hvsyncblank),
	DEFINEREG2(VSYNC_B, i830_debug_hvsyncblank),
	DEFINEREG(VSYNCSHIFT_B),
	DEFINEREG2(PIPEB_DATA_M1, ironlake_debug_m_tu),
	DEFINEREG2(PIPEB_DATA_N1, ironlake_debug_n),
	DEFINEREG2(PIPEB_LINK_M1, ironlake_debug_n),
	DEFINEREG2(PIPEB_LINK_N1, ironlake_debug_n),

	/* Transcoder C */
	DEFINEREG2(PIPECCONF, i830_debug_pipeconf),
	DEFINEREG2(HTOTAL_C, i830_debug_hvtotal),
	DEFINEREG2(HBLANK_C, i830_debug_hvsyncblank),
	DEFINEREG2(HSYNC_C, i830_debug_hvsyncblank),
	DEFINEREG2(VTOTAL_C, i830_debug_hvtotal),
	DEFINEREG2(VBLANK_C, i830_debug_hvsyncblank),
	DEFINEREG2(VSYNC_C, i830_debug_hvsyncblank),
	DEFINEREG(VSYNCSHIFT_C),
	DEFINEREG2(PIPEC_DATA_M1, ironlake_debug_m_tu),
	DEFINEREG2(PIPEC_DATA_N1, ironlake_debug_n),
	DEFINEREG2(PIPEC_LINK_M1, ironlake_debug_n),
	DEFINEREG2(PIPEC_LINK_N1, ironlake_debug_n),

	/* Transcoder EDP */
	DEFINEREG2(PIPEEDPCONF, i830_debug_pipeconf),
	DEFINEREG2(HTOTAL_EDP, i830_debug_hvtotal),
	DEFINEREG2(HBLANK_EDP, i830_debug_hvsyncblank),
	DEFINEREG2(HSYNC_EDP, i830_debug_hvsyncblank),
	DEFINEREG2(VTOTAL_EDP, i830_debug_hvtotal),
	DEFINEREG2(VBLANK_EDP, i830_debug_hvsyncblank),
	DEFINEREG2(VSYNC_EDP, i830_debug_hvsyncblank),
	DEFINEREG(VSYNCSHIFT_EDP),
	DEFINEREG2(PIPEEDP_DATA_M1, ironlake_debug_m_tu),
	DEFINEREG2(PIPEEDP_DATA_N1, ironlake_debug_n),
	DEFINEREG2(PIPEEDP_LINK_M1, ironlake_debug_n),
	DEFINEREG2(PIPEEDP_LINK_N1, ironlake_debug_n),

	/* Panel fitter */
	DEFINEREG2(PFA_CTL_1, ironlake_debug_panel_fitting),
	DEFINEREG2(PFA_WIN_POS, ironlake_debug_pf_win),
	DEFINEREG2(PFA_WIN_SIZE, ironlake_debug_pf_win),

	DEFINEREG2(PFB_CTL_1, ironlake_debug_panel_fitting),
	DEFINEREG2(PFB_WIN_POS, ironlake_debug_pf_win),
	DEFINEREG2(PFB_WIN_SIZE, ironlake_debug_pf_win),

	DEFINEREG2(PFC_CTL_1, ironlake_debug_panel_fitting),
	DEFINEREG2(PFC_WIN_POS, ironlake_debug_pf_win),
	DEFINEREG2(PFC_WIN_SIZE, ironlake_debug_pf_win),

	/* LPT */

	DEFINEREG2(TRANS_HTOTAL_A, i830_debug_hvtotal),
	DEFINEREG2(TRANS_HBLANK_A, i830_debug_hvsyncblank),
	DEFINEREG2(TRANS_HSYNC_A, i830_debug_hvsyncblank),
	DEFINEREG2(TRANS_VTOTAL_A, i830_debug_hvtotal),
	DEFINEREG2(TRANS_VBLANK_A, i830_debug_hvsyncblank),
	DEFINEREG2(TRANS_VSYNC_A, i830_debug_hvsyncblank),
	DEFINEREG(TRANS_VSYNCSHIFT_A),

	DEFINEREG2(TRANSACONF, ironlake_debug_transconf),

	DEFINEREG2(FDI_RXA_MISC, ironlake_debug_fdi_rx_misc),
	DEFINEREG(FDI_RXA_TUSIZE1),
	DEFINEREG(FDI_RXA_IIR),
	DEFINEREG(FDI_RXA_IMR),

	DEFINEREG2(BLC_PWM_CPU_CTL2, ilk_debug_blc_pwm_cpu_ctl2),
	DEFINEREG2(BLC_PWM_CPU_CTL, ilk_debug_blc_pwm_cpu_ctl),
	DEFINEREG2(BLC_PWM2_CPU_CTL2, ilk_debug_blc_pwm_cpu_ctl2),
	DEFINEREG2(BLC_PWM2_CPU_CTL, ilk_debug_blc_pwm_cpu_ctl),
	DEFINEREG2(BLC_MISC_CTL, hsw_debug_blc_misc_ctl),
	DEFINEREG2(BLC_PWM_PCH_CTL1, ibx_debug_blc_pwm_ctl1),
	DEFINEREG2(BLC_PWM_PCH_CTL2, ibx_debug_blc_pwm_ctl2),

	DEFINEREG2(UTIL_PIN_CTL, hsw_debug_util_pin_ctl),

	DEFINEREG2(PCH_PP_STATUS, i830_debug_pp_status),
	DEFINEREG2(PCH_PP_CONTROL, ilk_debug_pp_control),
	DEFINEREG(PCH_PP_ON_DELAYS),
	DEFINEREG(PCH_PP_OFF_DELAYS),
	DEFINEREG(PCH_PP_DIVISOR),

	DEFINEREG(PIXCLK_GATE),

	DEFINEREG2(SDEISR, hsw_debug_sinterrupt),

	DEFINEREG(RC6_RESIDENCY_TIME),
};

static const struct reg_debug i945gm_mi_regs[] = {
	DEFINEREG(PGETBL_CTL),
	DEFINEREG(PGTBL_ER),
	DEFINEREG(EXCC),
	DEFINEREG(HWS_PGA),
	DEFINEREG(IPEIR),
	DEFINEREG(IPEHR),
	DEFINEREG(INSTDONE),
	DEFINEREG(NOP_ID),
	DEFINEREG(HWSTAM),
	DEFINEREG(SCPD0),
	DEFINEREG(IER),
	DEFINEREG(IIR),
	DEFINEREG(IMR),
	DEFINEREG(ISR),
	DEFINEREG(EIR),
	DEFINEREG(EMR),
	DEFINEREG(ESR),
	DEFINEREG(INST_PM),
	DEFINEREG(ECOSKPD),
};

DEBUGSTRING(gen6_rp_control)
{
	return z_snprintf(result, len, "%s",
		 (val & (1 << 7)) ? "enabled" : "disabled");
}

static const struct reg_debug gen6_rp_debug_regs[] = {
	DEFINEREG2(GEN6_RP_CONTROL, gen6_rp_control),
	DEFINEREG(GEN6_RPNSWREQ),
	DEFINEREG(GEN6_RP_DOWN_TIMEOUT),
	DEFINEREG(GEN6_RP_INTERRUPT_LIMITS),
	DEFINEREG(GEN6_RP_UP_THRESHOLD),
	DEFINEREG(GEN6_RP_UP_EI),
	DEFINEREG(GEN6_RP_DOWN_EI),
	DEFINEREG(GEN6_RP_IDLE_HYSTERSIS),
	DEFINEREG(GEN6_RC_STATE),
	DEFINEREG(GEN6_RC_CONTROL),
	DEFINEREG(GEN6_RC1_WAKE_RATE_LIMIT),
	DEFINEREG(GEN6_RC6_WAKE_RATE_LIMIT),
	DEFINEREG(GEN6_RC_EVALUATION_INTERVAL),
	DEFINEREG(GEN6_RC_IDLE_HYSTERSIS),
	DEFINEREG(GEN6_RC_SLEEP),
	DEFINEREG(GEN6_RC1e_THRESHOLD),
	DEFINEREG(GEN6_RC6_THRESHOLD),
	DEFINEREG(GEN6_RC_VIDEO_FREQ),
	DEFINEREG(GEN6_PMIER),
	DEFINEREG(GEN6_PMIMR),
	DEFINEREG(GEN6_PMINTRMSK),
};

static bool is_hsw_plus(uint32_t devid, uint32_t pch)
{
	return IS_HASWELL(devid) || intel_gen(devid) >= 8;
}

static bool is_gen6_plus(uint32_t devid, uint32_t pch)
{
	return intel_gen(devid) >= 6;
}

static bool is_gen56ivb(uint32_t devid, uint32_t pch)
{
	return IS_GEN5(devid) || IS_GEN6(devid) || IS_IVYBRIDGE(devid);
}

static bool is_gen45(uint32_t devid, uint32_t pch)
{
	return IS_GEN4(devid) || IS_GEN5(devid);
}

static bool is_945gm(uint32_t devid, uint32_t pch)
{
	return IS_945GM(devid);
}

static bool is_gen234(uint32_t devid, uint32_t pch)
{
	return IS_GEN2(devid) || IS_GEN3(devid) || IS_GEN4(devid);
}

#define DECLARE_REGS(d,r,m)				\
	{ .description = d, .regs = r, .count = ARRAY_SIZE(r), .match = m }
static struct {
	const char *description;
	const struct reg_debug *regs;
	bool (*match)(uint32_t devid, uint32_t pch);
	int count;
} known_registers[] = {
	DECLARE_REGS("Gen2",	intel_debug_regs,	is_gen234),
	DECLARE_REGS("i945GM",	i945gm_mi_regs,		is_945gm),
	DECLARE_REGS("Gen4",	i965_fences,		is_gen45),
	DECLARE_REGS("Gen5",	ironlake_debug_regs,	is_gen56ivb),
	DECLARE_REGS("Gen6",	gen6_rp_debug_regs,	is_gen6_plus),
	DECLARE_REGS("Gen6+",	gen6_fences,		is_gen6_plus),
	DECLARE_REGS("Gen7.5",	haswell_debug_regs,	is_hsw_plus),
};
#undef DECLARE_REGS

/*
 * Decode register value into buffer for devid.
 *
 * If devid is 0, decode for all known platforms, with newline after each
 * decode.
 */
int intel_reg_spec_decode(char *buf, size_t bufsize, const struct reg *reg,
			  uint32_t val, uint32_t devid)
{
	char tmp[1024];
	int i, j;

	if (!bufsize)
		return -1;

	*buf = 0;

	for (i = 0; i < ARRAY_SIZE(known_registers); i++) {
		const struct reg_debug *regs = known_registers[i].regs;

		if (devid) {
			if (known_registers[i].match &&
			    !known_registers[i].match(devid, 0))
				continue;
		}

		for (j = 0; j < known_registers[i].count; j++) {
			const struct reg_debug *r = &regs[j];
			if (reg->addr != r->reg)
				continue;

			if (r->debug_output) {
				if (r->debug_output(tmp, sizeof(tmp), r->reg,
						    val, devid) == 0)
					continue;
			} else if (devid) {
				return 0;
			} else {
				continue;
			}

			if (devid) {
				strncpy(buf, tmp, bufsize);
				return 0;
			}

			strncat(buf, known_registers[i].description, bufsize);
			strncat(buf, "\t", bufsize);
			strncat(buf, tmp, bufsize);
			strncat(buf, "\n", bufsize);
		}
	}

	return 0;
}

static ssize_t get_regs(struct reg **regs, size_t *nregs, ssize_t index,
			uint32_t devid)
{
	ssize_t ret = -1;
	int i, j;

	if (!devid)
		return 0;

	for (i = 0; i < ARRAY_SIZE(known_registers); i++) {
		if (known_registers[i].match &&
		    !known_registers[i].match(devid, 0))
			continue;

		for (j = 0; j < known_registers[i].count; j++) {
			const struct reg_debug *reg_in =
				&known_registers[i].regs[j];
			struct reg reg = {};

			/* XXX: Could be optimized. */
			parse_port_desc(&reg, NULL);

			reg.name = strdup(reg_in->name);
			reg.addr = reg_in->reg;

			if (!*regs || index >= *nregs) {
				if (!*regs)
					*nregs = 64;
				else
					*nregs *= 2;

				*regs = recalloc(*regs, *nregs, sizeof(**regs));
				if (!*regs) {
					fprintf(stderr, "Error: %s\n", strerror(ENOMEM));
					goto out;
				}
			}

			(*regs)[index++] = reg;
		}
	}

	ret = index;

out:
	return ret;
}

/*
 * Get builtin register definitions for devid.
 */
ssize_t intel_reg_spec_builtin(struct reg **regs, uint32_t devid)
{
	size_t nregs = 0;
	*regs = NULL;

	return get_regs(regs, &nregs, 0, devid);
}