dev/gcdb/display/gcdb_autopll.c - kernel/lk - Gitiles

 /* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *  * Neither the name of The Linux Foundation nor the names of its
  *    contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */

 #include <debug.h>
 #include <err.h>
 #include <smem.h>
 #include <msm_panel.h>
 #include <mipi_dsi.h>

 #include "gcdb_autopll.h"

 static struct mdss_dsi_pll_config pll_data;

 static void calculate_bitclock(struct msm_panel_info *pinfo)
 {
 	uint32_t h_period = 0, v_period = 0;
 	uint32_t width = pinfo->xres;

 	if (pinfo->mipi.dual_dsi)
 		width = pinfo->xres / 2;

 	h_period = width + pinfo->lcdc.h_back_porch +
 		pinfo->lcdc.h_front_porch + pinfo->lcdc.h_pulse_width +
 		pinfo->lcdc.xres_pad;

 	v_period = pinfo->yres + pinfo->lcdc.v_back_porch +
 		pinfo->lcdc.v_front_porch + pinfo->lcdc.v_pulse_width +
 		pinfo->lcdc.yres_pad;

 	/* Pixel clock rate */
 	pll_data.pixel_clock = h_period * v_period * pinfo->mipi.frame_rate;

 	/* Store all bit clock form data */
 	if (pinfo->mipi.bitclock == 0)
 		pll_data.bit_clock = (pll_data.pixel_clock * pinfo->bpp) /
 					pinfo->mipi.num_of_lanes;
 	else
 		pll_data.bit_clock = pinfo->mipi.bitclock;

 	pll_data.byte_clock = pll_data.bit_clock >> 3;

 	pll_data.halfbit_clock = pll_data.bit_clock >> 1;
 }

 static uint32_t calculate_div1()
 {
 	uint32_t ret = NO_ERROR;

 	/* div1 - there is divide by 2 logic present */
 	if (pll_data.halfbit_clock > HALFBIT_CLOCK1) {
 		pll_data.posdiv1    = 0x0; /*div 1 */
 		pll_data.vco_clock  = pll_data.halfbit_clock << 1;
 	} else if (pll_data.halfbit_clock > HALFBIT_CLOCK2) {
 		pll_data.posdiv1    = 0x1; /*div 2 */
 		pll_data.vco_clock  = pll_data.halfbit_clock << 2;
 	} else if (pll_data.halfbit_clock > HALFBIT_CLOCK3) {
 		pll_data.posdiv1    = 0x3; /*div 4 */
 		pll_data.vco_clock  = pll_data.halfbit_clock << 3;
 	} else if (pll_data.halfbit_clock > HALFBIT_CLOCK4) {
 		pll_data.posdiv1    = 0x4; /*div 5 */
 		pll_data.vco_clock  = pll_data.halfbit_clock * 10;
 	} else {
 		dprintf(CRITICAL, "Not able to calculate posdiv1\n");
 	}

 	return ret;
 }

 static uint32_t calculate_div3(uint8_t bpp, uint8_t num_of_lanes)
 {
 	uint32_t ret = NO_ERROR;
 	pll_data.pclk_m = 0x1; /* M = 1, N= 1 */
 	pll_data.pclk_n = 0xFF; /* ~ (N-M) = 0xff */
 	pll_data.pclk_d = 0xFF; /* ~N = 0xFF */

 	/* formula is ( vco_clock / pdiv_digital) / mnd = pixel_clock */

 	/* div3  */
 	switch (bpp) {
 	case BITS_18:
 		if (num_of_lanes == 3) {
 			pll_data.posdiv3 = pll_data.vco_clock /
 					 pll_data.pixel_clock;
 		} else {
 			pll_data.posdiv3 = (pll_data.pixel_clock * 2 / 9) /
 					 pll_data.vco_clock;
 			pll_data.pclk_m = 0x2; /* M = 2,N = 9 */
 			pll_data.pclk_n = 0xF8;
 			pll_data.pclk_d = 0xF6;
 		}
 		break;
 	case BITS_16:
 		if (num_of_lanes == 3) {
 			pll_data.posdiv3 = (pll_data.pixel_clock * 3 / 8) /
 					 pll_data.vco_clock;
 			pll_data.pclk_m = 0x3; /* M = 3, N = 9 */
 			pll_data.pclk_n = 0xFA;
 			pll_data.pclk_d = 0xF7;
 		} else {
 			pll_data.posdiv3 = pll_data.vco_clock /
 					 pll_data.pixel_clock;
 		}
 		break;
 	case BITS_24:
 	default:
 		pll_data.posdiv3 = pll_data.vco_clock /
 					 pll_data.pixel_clock;
 		break;
 	}

 	pll_data.posdiv3--;	/* Register needs one value less */
 }

 static uint32_t calculate_dec_frac_start()
 {
 	uint32_t refclk = 19200000;
 	uint32_t vco_rate = pll_data.vco_clock;
 	uint32_t tmp, mod;

 	vco_rate /= 2;
 	pll_data.dec_start = vco_rate / refclk;
 	tmp = vco_rate % refclk; /* module, fraction */
 	tmp /= 192;
 	tmp *= 1024;
 	tmp /= 100;
 	tmp *= 1024;
 	tmp /= 1000;
 	pll_data.frac_start = tmp;

 	vco_rate *= 2; /* restore */
 	tmp = vco_rate / refclk;/* div 1000 first */
 	mod = vco_rate % refclk;
 	tmp *= 127;
 	mod *= 127;
 	mod /= refclk;
 	tmp += mod;
 	tmp /= 10;
 	pll_data.lock_comp = tmp;

 	dprintf(SPEW, "%s: dec_start=%u dec_frac=%u lock_comp=%u\n", __func__,
 		pll_data.dec_start, pll_data.frac_start, pll_data.lock_comp);
 }

 static uint32_t calculate_vco_28nm(uint8_t bpp, uint8_t num_of_lanes)
 {
 	uint8_t  counter = 0;
 	uint32_t temprate = 0;

 	/* If half bitclock is more than VCO min value */
 	if (pll_data.halfbit_clock > VCO_MIN_CLOCK) {

 		/* Direct Mode */

 		/* support vco clock to max value only */
 		if (pll_data.halfbit_clock > VCO_MAX_CLOCK)
 			pll_data.vco_clock = VCO_MAX_CLOCK;
 		else
 			pll_data.vco_clock = pll_data.halfbit_clock;
 		pll_data.directpath = 0x0;
 		pll_data.posdiv1    = 0x0; /*DSI spec says 0 - div 1 */
 					    /*1 - div 2 */
 					    /*F - div 16 */
 	} else {
 		/* Indirect Mode */

 		pll_data.directpath = 0x02; /* set bit 1 to enable for
 						 indirect path */

 		calculate_div1();
 	}

 	/* calculate mnd and div3 for direct and indirect path */
 	calculate_div3(bpp, num_of_lanes);

 	return NO_ERROR;
 }

 static uint32_t calculate_vco_20nm(uint8_t bpp, uint8_t lanes)
 {
 	uint32_t vco, dsi_clk;
 	int mod, ndiv, hr_oclk2, hr_oclk3;
 	int m = 1;
 	int n = 1;
 	int bpp_m = 3;	/* bpp = 3 */
 	int bpp_n = 1;

 	if (bpp == BITS_18) {
 		bpp_m = 9; /* bpp = 2.25 */
 		bpp_n = 4;

 		if (lanes == 2) {
 			m = 2;
 			n = 9;
 		} else if (lanes == 4) {
 			m = 4;
 			n = 9;
 		}
 	} else if (bpp == BITS_16) {
 		bpp_m = 2; /* bpp = 2 */
 		bpp_n = 1;
 		if (lanes == 3) {
 			m = 3;
 			n = 8;
 		}
 	}

 	hr_oclk2 = 4;

 	/* If bitclock is more than VCO min value */
 	if (pll_data.halfbit_clock >= HALF_VCO_MIN_CLOCK_20NM) {
 		/* Direct Mode */
 		vco  = pll_data.halfbit_clock << 1;
 		/* support vco clock to max value only */
 		if (vco > VCO_MAX_CLOCK_20NM)
 			vco = VCO_MAX_CLOCK_20NM;

 		pll_data.directpath = 0x0;
 		pll_data.byte_clock = vco / 2 / hr_oclk2;
 		pll_data.lp_div_mux = 0x0;
 		ndiv = 1;
 		hr_oclk3 = hr_oclk2 * m / n * bpp_m / bpp_n / lanes;
 	} else {
 		/* Indirect Mode */
 		mod =  VCO_MIN_CLOCK_20NM % (4 * pll_data.halfbit_clock );
 		ndiv = VCO_MIN_CLOCK_20NM / (4 * pll_data.halfbit_clock );
 		if (mod)
 			ndiv += 1;

 		vco = pll_data.halfbit_clock * 4 * ndiv;
 		pll_data.lp_div_mux = 0x1;
 		pll_data.directpath = 0x02; /* set bit 1 to enable for
 						 indirect path */

 		pll_data.byte_clock = vco / 4 / hr_oclk2 / ndiv;
 		hr_oclk3 = hr_oclk2 * m / n  * ndiv * 2 * bpp_m / bpp_n / lanes;
 	}

 	pll_data.vco_clock = vco;
 	dsi_clk = vco / 2 / hr_oclk3;
 	pll_data.ndiv = ndiv;
 	pll_data.hr_oclk2 = hr_oclk2 - 1; 	/* strat from 0 */
 	pll_data.hr_oclk3 = hr_oclk3 - 1; 	/* strat from 0 */

 	pll_data.pclk_m = m;		/* M */
 	pll_data.pclk_n = ~(n - m); 	/* ~(N-M) */
 	pll_data.pclk_d = ~n;		/* ~N  */

 	dprintf(SPEW, "%s: oclk2=%d oclk3=%d ndiv=%d vco=%u dsi_clk=%u byte_clk=%u\n",
 	__func__, hr_oclk2, hr_oclk3, ndiv, vco, dsi_clk, pll_data.byte_clock);

 	calculate_dec_frac_start();

 	return NO_ERROR;
 }

 uint32_t calculate_clock_config(struct msm_panel_info *pinfo)
 {
 	uint32_t ret = NO_ERROR;

 	calculate_bitclock(pinfo);

 	if (pinfo->mipi.mdss_dsi_phy_db->is_pll_20nm)
 		ret = calculate_vco_20nm(pinfo->bpp, pinfo->mipi.num_of_lanes);
 	else
 		ret = calculate_vco_28nm(pinfo->bpp, pinfo->mipi.num_of_lanes);

 	pinfo->mipi.dsi_pll_config = &pll_data;

 	return ret;
 }
	/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of The Linux Foundation nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
	* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
	* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
	* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
	* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
	* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/

	#include <debug.h>
	#include <err.h>
	#include <smem.h>
	#include <msm_panel.h>
	#include <mipi_dsi.h>

	#include "gcdb_autopll.h"

	static struct mdss_dsi_pll_config pll_data;

	static void calculate_bitclock(struct msm_panel_info *pinfo)
	{
	uint32_t h_period = 0, v_period = 0;
	uint32_t width = pinfo->xres;

	if (pinfo->mipi.dual_dsi)
	width = pinfo->xres / 2;

	h_period = width + pinfo->lcdc.h_back_porch +
	pinfo->lcdc.h_front_porch + pinfo->lcdc.h_pulse_width +
	pinfo->lcdc.xres_pad;

	v_period = pinfo->yres + pinfo->lcdc.v_back_porch +
	pinfo->lcdc.v_front_porch + pinfo->lcdc.v_pulse_width +
	pinfo->lcdc.yres_pad;

	/* Pixel clock rate */
	pll_data.pixel_clock = h_period * v_period * pinfo->mipi.frame_rate;

	/* Store all bit clock form data */
	if (pinfo->mipi.bitclock == 0)
	pll_data.bit_clock = (pll_data.pixel_clock * pinfo->bpp) /
	pinfo->mipi.num_of_lanes;
	else
	pll_data.bit_clock = pinfo->mipi.bitclock;

	pll_data.byte_clock = pll_data.bit_clock >> 3;

	pll_data.halfbit_clock = pll_data.bit_clock >> 1;
	}

	static uint32_t calculate_div1()
	{
	uint32_t ret = NO_ERROR;

	/* div1 - there is divide by 2 logic present */
	if (pll_data.halfbit_clock > HALFBIT_CLOCK1) {
	pll_data.posdiv1 = 0x0; /div 1 /
	pll_data.vco_clock = pll_data.halfbit_clock << 1;
	} else if (pll_data.halfbit_clock > HALFBIT_CLOCK2) {
	pll_data.posdiv1 = 0x1; /div 2 /
	pll_data.vco_clock = pll_data.halfbit_clock << 2;
	} else if (pll_data.halfbit_clock > HALFBIT_CLOCK3) {
	pll_data.posdiv1 = 0x3; /div 4 /
	pll_data.vco_clock = pll_data.halfbit_clock << 3;
	} else if (pll_data.halfbit_clock > HALFBIT_CLOCK4) {
	pll_data.posdiv1 = 0x4; /div 5 /
	pll_data.vco_clock = pll_data.halfbit_clock * 10;
	} else {
	dprintf(CRITICAL, "Not able to calculate posdiv1\n");
	}

	return ret;
	}

	static uint32_t calculate_div3(uint8_t bpp, uint8_t num_of_lanes)
	{
	uint32_t ret = NO_ERROR;
	pll_data.pclk_m = 0x1; /* M = 1, N= 1 */
	pll_data.pclk_n = 0xFF; /* ~ (N-M) = 0xff */
	pll_data.pclk_d = 0xFF; /* ~N = 0xFF */

	/* formula is ( vco_clock / pdiv_digital) / mnd = pixel_clock */

	/* div3 */
	switch (bpp) {
	case BITS_18:
	if (num_of_lanes == 3) {
	pll_data.posdiv3 = pll_data.vco_clock /
	pll_data.pixel_clock;
	} else {
	pll_data.posdiv3 = (pll_data.pixel_clock * 2 / 9) /
	pll_data.vco_clock;
	pll_data.pclk_m = 0x2; /* M = 2,N = 9 */
	pll_data.pclk_n = 0xF8;
	pll_data.pclk_d = 0xF6;
	}
	break;
	case BITS_16:
	if (num_of_lanes == 3) {
	pll_data.posdiv3 = (pll_data.pixel_clock * 3 / 8) /
	pll_data.vco_clock;
	pll_data.pclk_m = 0x3; /* M = 3, N = 9 */
	pll_data.pclk_n = 0xFA;
	pll_data.pclk_d = 0xF7;
	} else {
	pll_data.posdiv3 = pll_data.vco_clock /
	pll_data.pixel_clock;
	}
	break;
	case BITS_24:
	default:
	pll_data.posdiv3 = pll_data.vco_clock /
	pll_data.pixel_clock;
	break;
	}

	pll_data.posdiv3--; /* Register needs one value less */
	}

	static uint32_t calculate_dec_frac_start()
	{
	uint32_t refclk = 19200000;
	uint32_t vco_rate = pll_data.vco_clock;
	uint32_t tmp, mod;

	vco_rate /= 2;
	pll_data.dec_start = vco_rate / refclk;
	tmp = vco_rate % refclk; /* module, fraction */
	tmp /= 192;
	tmp *= 1024;
	tmp /= 100;
	tmp *= 1024;
	tmp /= 1000;
	pll_data.frac_start = tmp;

	vco_rate = 2; / restore */
	tmp = vco_rate / refclk;/* div 1000 first */
	mod = vco_rate % refclk;
	tmp *= 127;
	mod *= 127;
	mod /= refclk;
	tmp += mod;
	tmp /= 10;
	pll_data.lock_comp = tmp;

	dprintf(SPEW, "%s: dec_start=%u dec_frac=%u lock_comp=%u\n", __func__,
	pll_data.dec_start, pll_data.frac_start, pll_data.lock_comp);
	}

	static uint32_t calculate_vco_28nm(uint8_t bpp, uint8_t num_of_lanes)
	{
	uint8_t counter = 0;
	uint32_t temprate = 0;

	/* If half bitclock is more than VCO min value */
	if (pll_data.halfbit_clock > VCO_MIN_CLOCK) {

	/* Direct Mode */

	/* support vco clock to max value only */
	if (pll_data.halfbit_clock > VCO_MAX_CLOCK)
	pll_data.vco_clock = VCO_MAX_CLOCK;
	else
	pll_data.vco_clock = pll_data.halfbit_clock;
	pll_data.directpath = 0x0;
	pll_data.posdiv1 = 0x0; /DSI spec says 0 - div 1 /
	/1 - div 2 /
	/F - div 16 /
	} else {
	/* Indirect Mode */

	pll_data.directpath = 0x02; /* set bit 1 to enable for
	indirect path */

	calculate_div1();
	}

	/* calculate mnd and div3 for direct and indirect path */
	calculate_div3(bpp, num_of_lanes);

	return NO_ERROR;
	}

	static uint32_t calculate_vco_20nm(uint8_t bpp, uint8_t lanes)
	{
	uint32_t vco, dsi_clk;
	int mod, ndiv, hr_oclk2, hr_oclk3;
	int m = 1;
	int n = 1;
	int bpp_m = 3; /* bpp = 3 */
	int bpp_n = 1;

	if (bpp == BITS_18) {
	bpp_m = 9; /* bpp = 2.25 */
	bpp_n = 4;

	if (lanes == 2) {
	m = 2;
	n = 9;
	} else if (lanes == 4) {
	m = 4;
	n = 9;
	}
	} else if (bpp == BITS_16) {
	bpp_m = 2; /* bpp = 2 */
	bpp_n = 1;
	if (lanes == 3) {
	m = 3;
	n = 8;
	}
	}

	hr_oclk2 = 4;

	/* If bitclock is more than VCO min value */
	if (pll_data.halfbit_clock >= HALF_VCO_MIN_CLOCK_20NM) {
	/* Direct Mode */
	vco = pll_data.halfbit_clock << 1;
	/* support vco clock to max value only */
	if (vco > VCO_MAX_CLOCK_20NM)
	vco = VCO_MAX_CLOCK_20NM;

	pll_data.directpath = 0x0;
	pll_data.byte_clock = vco / 2 / hr_oclk2;
	pll_data.lp_div_mux = 0x0;
	ndiv = 1;
	hr_oclk3 = hr_oclk2 * m / n * bpp_m / bpp_n / lanes;
	} else {
	/* Indirect Mode */
	mod = VCO_MIN_CLOCK_20NM % (4 * pll_data.halfbit_clock );
	ndiv = VCO_MIN_CLOCK_20NM / (4 * pll_data.halfbit_clock );
	if (mod)
	ndiv += 1;

	vco = pll_data.halfbit_clock * 4 * ndiv;
	pll_data.lp_div_mux = 0x1;
	pll_data.directpath = 0x02; /* set bit 1 to enable for
	indirect path */

	pll_data.byte_clock = vco / 4 / hr_oclk2 / ndiv;
	hr_oclk3 = hr_oclk2 * m / n * ndiv * 2 * bpp_m / bpp_n / lanes;
	}

	pll_data.vco_clock = vco;
	dsi_clk = vco / 2 / hr_oclk3;
	pll_data.ndiv = ndiv;
	pll_data.hr_oclk2 = hr_oclk2 - 1; /* strat from 0 */
	pll_data.hr_oclk3 = hr_oclk3 - 1; /* strat from 0 */

	pll_data.pclk_m = m; /* M */
	pll_data.pclk_n = ~(n - m); /* ~(N-M) */
	pll_data.pclk_d = ~n; /* ~N */

	dprintf(SPEW, "%s: oclk2=%d oclk3=%d ndiv=%d vco=%u dsi_clk=%u byte_clk=%u\n",
	__func__, hr_oclk2, hr_oclk3, ndiv, vco, dsi_clk, pll_data.byte_clock);

	calculate_dec_frac_start();

	return NO_ERROR;
	}

	uint32_t calculate_clock_config(struct msm_panel_info *pinfo)
	{
	uint32_t ret = NO_ERROR;

	calculate_bitclock(pinfo);

	if (pinfo->mipi.mdss_dsi_phy_db->is_pll_20nm)
	ret = calculate_vco_20nm(pinfo->bpp, pinfo->mipi.num_of_lanes);
	else
	ret = calculate_vco_28nm(pinfo->bpp, pinfo->mipi.num_of_lanes);

	pinfo->mipi.dsi_pll_config = &pll_data;

	return ret;
	}