drivers/staging/sm750fb/ddk750_display.c

#include "ddk750_reg.h"
#include "ddk750_help.h"
#include "ddk750_display.h"
#include "ddk750_power.h"
#include "ddk750_dvi.h"

#define primaryWaitVerticalSync(delay) waitNextVerticalSync(0, delay)

static void setDisplayControl(int ctrl, int disp_state)
{
	/* state != 0 means turn on both timing & plane en_bit */
	unsigned long ulDisplayCtrlReg, ulReservedBits;
	int cnt;

	cnt = 0;

	/* Set the primary display control */
	if (!ctrl) {
		ulDisplayCtrlReg = PEEK32(PANEL_DISPLAY_CTRL);
		/* Turn on/off the Panel display control */
		if (disp_state) {
			/* Timing should be enabled first before enabling the plane
			 * because changing at the same time does not guarantee that
			 * the plane will also enabled or disabled.
			 */
			ulDisplayCtrlReg = FIELD_SET(ulDisplayCtrlReg,
								PANEL_DISPLAY_CTRL, TIMING, ENABLE);
			POKE32(PANEL_DISPLAY_CTRL, ulDisplayCtrlReg);

			ulDisplayCtrlReg = FIELD_SET(ulDisplayCtrlReg,
								PANEL_DISPLAY_CTRL, PLANE, ENABLE);

			/* Added some masks to mask out the reserved bits.
			 * Sometimes, the reserved bits are set/reset randomly when
			 * writing to the PRIMARY_DISPLAY_CTRL, therefore, the register
			 * reserved bits are needed to be masked out.
			 */
			ulReservedBits = FIELD_SET(0, PANEL_DISPLAY_CTRL, RESERVED_1_MASK, ENABLE) |
				FIELD_SET(0, PANEL_DISPLAY_CTRL, RESERVED_2_MASK, ENABLE) |
				FIELD_SET(0, PANEL_DISPLAY_CTRL, RESERVED_3_MASK, ENABLE);

			/* Somehow the register value on the plane is not set
			 * until a few delay. Need to write
			 * and read it a couple times
			 */
			do {
				cnt++;
				POKE32(PANEL_DISPLAY_CTRL, ulDisplayCtrlReg);
			} while ((PEEK32(PANEL_DISPLAY_CTRL) & ~ulReservedBits) !=
					(ulDisplayCtrlReg & ~ulReservedBits));
			printk("Set Panel Plane enbit:after tried %d times\n", cnt);
		} else {
			/* When turning off, there is no rule on the programming
			 * sequence since whenever the clock is off, then it does not
			 * matter whether the plane is enabled or disabled.
			 * Note: Modifying the plane bit will take effect on the
			 * next vertical sync. Need to find out if it is necessary to
			 * wait for 1 vsync before modifying the timing enable bit.
			 * */
			ulDisplayCtrlReg = FIELD_SET(ulDisplayCtrlReg,
								PANEL_DISPLAY_CTRL, PLANE, DISABLE);
			POKE32(PANEL_DISPLAY_CTRL, ulDisplayCtrlReg);

			ulDisplayCtrlReg = FIELD_SET(ulDisplayCtrlReg,
								PANEL_DISPLAY_CTRL, TIMING, DISABLE);
			POKE32(PANEL_DISPLAY_CTRL, ulDisplayCtrlReg);
		}

	} else {
		/* Set the secondary display control */
		ulDisplayCtrlReg = PEEK32(CRT_DISPLAY_CTRL);

		if (disp_state) {
			/* Timing should be enabled first before enabling the plane because changing at the
			   same time does not guarantee that the plane will also enabled or disabled.
			   */
			ulDisplayCtrlReg = FIELD_SET(ulDisplayCtrlReg,
								CRT_DISPLAY_CTRL, TIMING, ENABLE);
			POKE32(CRT_DISPLAY_CTRL, ulDisplayCtrlReg);

			ulDisplayCtrlReg = FIELD_SET(ulDisplayCtrlReg,
								CRT_DISPLAY_CTRL, PLANE, ENABLE);

			/* Added some masks to mask out the reserved bits.
			 * Sometimes, the reserved bits are set/reset randomly when
			 * writing to the PRIMARY_DISPLAY_CTRL, therefore, the register
			 * reserved bits are needed to be masked out.
			 */

			ulReservedBits = FIELD_SET(0, CRT_DISPLAY_CTRL, RESERVED_1_MASK, ENABLE) |
				FIELD_SET(0, CRT_DISPLAY_CTRL, RESERVED_2_MASK, ENABLE) |
				FIELD_SET(0, CRT_DISPLAY_CTRL, RESERVED_3_MASK, ENABLE) |
				FIELD_SET(0, CRT_DISPLAY_CTRL, RESERVED_4_MASK, ENABLE);

			do {
				cnt++;
				POKE32(CRT_DISPLAY_CTRL, ulDisplayCtrlReg);
			} while ((PEEK32(CRT_DISPLAY_CTRL) & ~ulReservedBits) !=
					(ulDisplayCtrlReg & ~ulReservedBits));
				printk("Set Crt Plane enbit:after tried %d times\n", cnt);
		} else {
			/* When turning off, there is no rule on the programming
			 * sequence since whenever the clock is off, then it does not
			 * matter whether the plane is enabled or disabled.
			 * Note: Modifying the plane bit will take effect on the next
			 * vertical sync. Need to find out if it is necessary to
			 * wait for 1 vsync before modifying the timing enable bit.
			 */
			ulDisplayCtrlReg = FIELD_SET(ulDisplayCtrlReg,
								CRT_DISPLAY_CTRL, PLANE, DISABLE);
			POKE32(CRT_DISPLAY_CTRL, ulDisplayCtrlReg);

			ulDisplayCtrlReg = FIELD_SET(ulDisplayCtrlReg,
								CRT_DISPLAY_CTRL, TIMING, DISABLE);
			POKE32(CRT_DISPLAY_CTRL, ulDisplayCtrlReg);
		}
	}
}

static void waitNextVerticalSync(int ctrl, int delay)
{
	unsigned int status;

	if (!ctrl) {
		/* primary controller */

		/* Do not wait when the Primary PLL is off or display control is already off.
		   This will prevent the software to wait forever. */
		if ((FIELD_GET(PEEK32(PANEL_PLL_CTRL), PANEL_PLL_CTRL, POWER) ==
			 PANEL_PLL_CTRL_POWER_OFF) ||
			(FIELD_GET(PEEK32(PANEL_DISPLAY_CTRL), PANEL_DISPLAY_CTRL, TIMING) ==
			 PANEL_DISPLAY_CTRL_TIMING_DISABLE)) {
			return;
		}

		while (delay-- > 0) {
			/* Wait for end of vsync. */
			do {
				status = FIELD_GET(PEEK32(SYSTEM_CTRL),
						   SYSTEM_CTRL,
						   PANEL_VSYNC);
			} while (status == SYSTEM_CTRL_PANEL_VSYNC_ACTIVE);

			/* Wait for start of vsync. */
			do {
				status = FIELD_GET(PEEK32(SYSTEM_CTRL),
						   SYSTEM_CTRL,
						   PANEL_VSYNC);
			} while (status == SYSTEM_CTRL_PANEL_VSYNC_INACTIVE);
		}

	} else {

		/* Do not wait when the Primary PLL is off or display control is already off.
			   This will prevent the software to wait forever. */
		if ((FIELD_GET(PEEK32(CRT_PLL_CTRL), CRT_PLL_CTRL, POWER) ==
			 CRT_PLL_CTRL_POWER_OFF) ||
			(FIELD_GET(PEEK32(CRT_DISPLAY_CTRL), CRT_DISPLAY_CTRL, TIMING) ==
			 CRT_DISPLAY_CTRL_TIMING_DISABLE)) {
			return;
		}

		while (delay-- > 0) {
			/* Wait for end of vsync. */
			do {
				status = FIELD_GET(PEEK32(SYSTEM_CTRL),
								   SYSTEM_CTRL,
								   CRT_VSYNC);
			} while (status == SYSTEM_CTRL_CRT_VSYNC_ACTIVE);

			/* Wait for start of vsync. */
			do {
				status = FIELD_GET(PEEK32(SYSTEM_CTRL),
								   SYSTEM_CTRL,
								   CRT_VSYNC);
			} while (status == SYSTEM_CTRL_CRT_VSYNC_INACTIVE);
		}
	}
}

static void swPanelPowerSequence(int disp, int delay)
{
	unsigned int reg;

	/* disp should be 1 to open sequence */
	reg = PEEK32(PANEL_DISPLAY_CTRL);
	reg = FIELD_VALUE(reg, PANEL_DISPLAY_CTRL, FPEN, disp);
	POKE32(PANEL_DISPLAY_CTRL, reg);
	primaryWaitVerticalSync(delay);

	reg = PEEK32(PANEL_DISPLAY_CTRL);
	reg = FIELD_VALUE(reg, PANEL_DISPLAY_CTRL, DATA, disp);
	POKE32(PANEL_DISPLAY_CTRL, reg);
	primaryWaitVerticalSync(delay);

	reg = PEEK32(PANEL_DISPLAY_CTRL);
	reg = FIELD_VALUE(reg, PANEL_DISPLAY_CTRL, VBIASEN, disp);
	POKE32(PANEL_DISPLAY_CTRL, reg);
	primaryWaitVerticalSync(delay);

	reg = PEEK32(PANEL_DISPLAY_CTRL);
	reg = FIELD_VALUE(reg, PANEL_DISPLAY_CTRL, FPEN, disp);
	POKE32(PANEL_DISPLAY_CTRL, reg);
	primaryWaitVerticalSync(delay);

}

void ddk750_setLogicalDispOut(disp_output_t output)
{
	unsigned int reg;

	if (output & PNL_2_USAGE) {
		/* set panel path controller select */
		reg = PEEK32(PANEL_DISPLAY_CTRL);
		reg = FIELD_VALUE(reg, PANEL_DISPLAY_CTRL, SELECT, (output & PNL_2_MASK)>>PNL_2_OFFSET);
		POKE32(PANEL_DISPLAY_CTRL, reg);
	}

	if (output & CRT_2_USAGE) {
		/* set crt path controller select */
		reg = PEEK32(CRT_DISPLAY_CTRL);
		reg = FIELD_VALUE(reg, CRT_DISPLAY_CTRL, SELECT, (output & CRT_2_MASK)>>CRT_2_OFFSET);
		/*se blank off */
		reg = FIELD_SET(reg, CRT_DISPLAY_CTRL, BLANK, OFF);
		POKE32(CRT_DISPLAY_CTRL, reg);

	}

	if (output & PRI_TP_USAGE) {
		/* set primary timing and plane en_bit */
		setDisplayControl(0, (output & PRI_TP_MASK) >> PRI_TP_OFFSET);
	}

	if (output & SEC_TP_USAGE) {
		/* set secondary timing and plane en_bit*/
		setDisplayControl(1, (output & SEC_TP_MASK) >> SEC_TP_OFFSET);
	}

	if (output & PNL_SEQ_USAGE) {
		/* set  panel sequence */
		swPanelPowerSequence((output & PNL_SEQ_MASK) >> PNL_SEQ_OFFSET, 4);
	}

	if (output & DAC_USAGE)
		setDAC((output & DAC_MASK) >> DAC_OFFSET);

	if (output & DPMS_USAGE)
		ddk750_setDPMS((output & DPMS_MASK) >> DPMS_OFFSET);
}