drivers/gpu/drm/gma500/mdfld_device.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /**************************************************************************
  * Copyright (c) 2011, Intel Corporation.
  * All Rights Reserved.
  *
  **************************************************************************/

 #include <linux/delay.h>

 #include <asm/intel_scu_ipc.h>

 #include "mdfld_dsi_output.h"
 #include "mdfld_output.h"
 #include "mid_bios.h"
 #include "psb_drv.h"
 #include "tc35876x-dsi-lvds.h"

 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE

 #define MRST_BLC_MAX_PWM_REG_FREQ	    0xFFFF
 #define BLC_PWM_PRECISION_FACTOR 100	/* 10000000 */
 #define BLC_PWM_FREQ_CALC_CONSTANT 32
 #define MHz 1000000
 #define BRIGHTNESS_MIN_LEVEL 1
 #define BRIGHTNESS_MAX_LEVEL 100
 #define BRIGHTNESS_MASK	0xFF
 #define BLC_POLARITY_NORMAL 0
 #define BLC_POLARITY_INVERSE 1
 #define BLC_ADJUSTMENT_MAX 100

 #define MDFLD_BLC_PWM_PRECISION_FACTOR    10
 #define MDFLD_BLC_MAX_PWM_REG_FREQ        0xFFFE
 #define MDFLD_BLC_MIN_PWM_REG_FREQ        0x2

 #define MDFLD_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
 #define MDFLD_BACKLIGHT_PWM_CTL_SHIFT	(16)

 static struct backlight_device *mdfld_backlight_device;

 int mdfld_set_brightness(struct backlight_device *bd)
 {
 	struct drm_device *dev =
 		(struct drm_device *)bl_get_data(mdfld_backlight_device);
 	struct drm_psb_private *dev_priv = dev->dev_private;
 	int level = bd->props.brightness;

 	DRM_DEBUG_DRIVER("backlight level set to %d\n", level);

 	/* Perform value bounds checking */
 	if (level < BRIGHTNESS_MIN_LEVEL)
 		level = BRIGHTNESS_MIN_LEVEL;

 	if (gma_power_begin(dev, false)) {
 		u32 adjusted_level = 0;

 		/*
 		 * Adjust the backlight level with the percent in
 		 * dev_priv->blc_adj2
 		 */
 		adjusted_level = level * dev_priv->blc_adj2;
 		adjusted_level = adjusted_level / BLC_ADJUSTMENT_MAX;
 		dev_priv->brightness_adjusted = adjusted_level;

 		if (mdfld_get_panel_type(dev, 0) == TC35876X) {
 			if (dev_priv->dpi_panel_on[0] ||
 					dev_priv->dpi_panel_on[2])
 				tc35876x_brightness_control(dev,
 						dev_priv->brightness_adjusted);
 		} else {
 			if (dev_priv->dpi_panel_on[0])
 				mdfld_dsi_brightness_control(dev, 0,
 						dev_priv->brightness_adjusted);
 		}

 		if (dev_priv->dpi_panel_on[2])
 			mdfld_dsi_brightness_control(dev, 2,
 					dev_priv->brightness_adjusted);
 		gma_power_end(dev);
 	}

 	/* cache the brightness for later use */
 	dev_priv->brightness = level;
 	return 0;
 }

 static int mdfld_get_brightness(struct backlight_device *bd)
 {
 	struct drm_device *dev =
 		(struct drm_device *)bl_get_data(mdfld_backlight_device);
 	struct drm_psb_private *dev_priv = dev->dev_private;

 	DRM_DEBUG_DRIVER("brightness = 0x%x \n", dev_priv->brightness);

 	/* return locally cached var instead of HW read (due to DPST etc.) */
 	return dev_priv->brightness;
 }

 static const struct backlight_ops mdfld_ops = {
 	.get_brightness = mdfld_get_brightness,
 	.update_status  = mdfld_set_brightness,
 };

 static int device_backlight_init(struct drm_device *dev)
 {
 	struct drm_psb_private *dev_priv = (struct drm_psb_private *)
 		dev->dev_private;

 	dev_priv->blc_adj1 = BLC_ADJUSTMENT_MAX;
 	dev_priv->blc_adj2 = BLC_ADJUSTMENT_MAX;

 	return 0;
 }

 static int mdfld_backlight_init(struct drm_device *dev)
 {
 	struct backlight_properties props;
 	int ret = 0;

 	memset(&props, 0, sizeof(struct backlight_properties));
 	props.max_brightness = BRIGHTNESS_MAX_LEVEL;
 	props.type = BACKLIGHT_PLATFORM;
 	mdfld_backlight_device = backlight_device_register("mdfld-bl",
 				NULL, (void *)dev, &mdfld_ops, &props);

 	if (IS_ERR(mdfld_backlight_device))
 		return PTR_ERR(mdfld_backlight_device);

 	ret = device_backlight_init(dev);
 	if (ret)
 		return ret;

 	mdfld_backlight_device->props.brightness = BRIGHTNESS_MAX_LEVEL;
 	mdfld_backlight_device->props.max_brightness = BRIGHTNESS_MAX_LEVEL;
 	backlight_update_status(mdfld_backlight_device);
 	return 0;
 }
 #endif

 struct backlight_device *mdfld_get_backlight_device(void)
 {
 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 	return mdfld_backlight_device;
 #else
 	return NULL;
 #endif
 }

 /*
  * mdfld_save_display_registers
  *
  * Description: We are going to suspend so save current display
  * register state.
  *
  * Notes: FIXME_JLIU7 need to add the support for DPI MIPI & HDMI audio
  */
 static int mdfld_save_display_registers(struct drm_device *dev, int pipenum)
 {
 	struct drm_psb_private *dev_priv = dev->dev_private;
 	struct medfield_state *regs = &dev_priv->regs.mdfld;
 	struct psb_pipe *pipe = &dev_priv->regs.pipe[pipenum];
 	const struct psb_offset *map = &dev_priv->regmap[pipenum];
 	int i;
 	u32 *mipi_val;

 	/* register */
 	u32 mipi_reg = MIPI;

 	switch (pipenum) {
 	case 0:
 		mipi_val = &regs->saveMIPI;
 		break;
 	case 1:
 		mipi_val = &regs->saveMIPI;
 		break;
 	case 2:
 		/* register */
 		mipi_reg = MIPI_C;
 		/* pointer to values */
 		mipi_val = &regs->saveMIPI_C;
 		break;
 	default:
 		DRM_ERROR("%s, invalid pipe number.\n", __func__);
 		return -EINVAL;
 	}

 	/* Pipe & plane A info */
 	pipe->dpll = PSB_RVDC32(map->dpll);
 	pipe->fp0 = PSB_RVDC32(map->fp0);
 	pipe->conf = PSB_RVDC32(map->conf);
 	pipe->htotal = PSB_RVDC32(map->htotal);
 	pipe->hblank = PSB_RVDC32(map->hblank);
 	pipe->hsync = PSB_RVDC32(map->hsync);
 	pipe->vtotal = PSB_RVDC32(map->vtotal);
 	pipe->vblank = PSB_RVDC32(map->vblank);
 	pipe->vsync = PSB_RVDC32(map->vsync);
 	pipe->src = PSB_RVDC32(map->src);
 	pipe->stride = PSB_RVDC32(map->stride);
 	pipe->linoff = PSB_RVDC32(map->linoff);
 	pipe->tileoff = PSB_RVDC32(map->tileoff);
 	pipe->size = PSB_RVDC32(map->size);
 	pipe->pos = PSB_RVDC32(map->pos);
 	pipe->surf = PSB_RVDC32(map->surf);
 	pipe->cntr = PSB_RVDC32(map->cntr);
 	pipe->status = PSB_RVDC32(map->status);

 	/*save palette (gamma) */
 	for (i = 0; i < 256; i++)
 		pipe->palette[i] = PSB_RVDC32(map->palette + (i << 2));

 	if (pipenum == 1) {
 		regs->savePFIT_CONTROL = PSB_RVDC32(PFIT_CONTROL);
 		regs->savePFIT_PGM_RATIOS = PSB_RVDC32(PFIT_PGM_RATIOS);

 		regs->saveHDMIPHYMISCCTL = PSB_RVDC32(HDMIPHYMISCCTL);
 		regs->saveHDMIB_CONTROL = PSB_RVDC32(HDMIB_CONTROL);
 		return 0;
 	}

 	*mipi_val = PSB_RVDC32(mipi_reg);
 	return 0;
 }

 /*
  * mdfld_restore_display_registers
  *
  * Description: We are going to resume so restore display register state.
  *
  * Notes: FIXME_JLIU7 need to add the support for DPI MIPI & HDMI audio
  */
 static int mdfld_restore_display_registers(struct drm_device *dev, int pipenum)
 {
 	/* To get  panel out of ULPS mode. */
 	u32 temp = 0;
 	u32 device_ready_reg = DEVICE_READY_REG;
 	struct drm_psb_private *dev_priv = dev->dev_private;
 	struct mdfld_dsi_config *dsi_config = NULL;
 	struct medfield_state *regs = &dev_priv->regs.mdfld;
 	struct psb_pipe *pipe = &dev_priv->regs.pipe[pipenum];
 	const struct psb_offset *map = &dev_priv->regmap[pipenum];
 	u32 i;
 	u32 dpll;
 	u32 timeout = 0;

 	/* register */
 	u32 mipi_reg = MIPI;

 	/* values */
 	u32 dpll_val = pipe->dpll;
 	u32 mipi_val = regs->saveMIPI;

 	switch (pipenum) {
 	case 0:
 		dpll_val &= ~DPLL_VCO_ENABLE;
 		dsi_config = dev_priv->dsi_configs[0];
 		break;
 	case 1:
 		dpll_val &= ~DPLL_VCO_ENABLE;
 		break;
 	case 2:
 		mipi_reg = MIPI_C;
 		mipi_val = regs->saveMIPI_C;
 		dsi_config = dev_priv->dsi_configs[1];
 		break;
 	default:
 		DRM_ERROR("%s, invalid pipe number.\n", __func__);
 		return -EINVAL;
 	}

 	/*make sure VGA plane is off. it initializes to on after reset!*/
 	PSB_WVDC32(0x80000000, VGACNTRL);

 	if (pipenum == 1) {
 		PSB_WVDC32(dpll_val & ~DPLL_VCO_ENABLE, map->dpll);
 		PSB_RVDC32(map->dpll);

 		PSB_WVDC32(pipe->fp0, map->fp0);
 	} else {

 		dpll = PSB_RVDC32(map->dpll);

 		if (!(dpll & DPLL_VCO_ENABLE)) {

 			/* When ungating power of DPLL, needs to wait 0.5us
 			   before enable the VCO */
 			if (dpll & MDFLD_PWR_GATE_EN) {
 				dpll &= ~MDFLD_PWR_GATE_EN;
 				PSB_WVDC32(dpll, map->dpll);
 				/* FIXME_MDFLD PO - change 500 to 1 after PO */
 				udelay(500);
 			}

 			PSB_WVDC32(pipe->fp0, map->fp0);
 			PSB_WVDC32(dpll_val, map->dpll);
 			/* FIXME_MDFLD PO - change 500 to 1 after PO */
 			udelay(500);

 			dpll_val |= DPLL_VCO_ENABLE;
 			PSB_WVDC32(dpll_val, map->dpll);
 			PSB_RVDC32(map->dpll);

 			/* wait for DSI PLL to lock */
 			while (timeout < 20000 &&
 			  !(PSB_RVDC32(map->conf) & PIPECONF_DSIPLL_LOCK)) {
 				udelay(150);
 				timeout++;
 			}

 			if (timeout == 20000) {
 				DRM_ERROR("%s, can't lock DSIPLL.\n",
 								__func__);
 				return -EINVAL;
 			}
 		}
 	}
 	/* Restore mode */
 	PSB_WVDC32(pipe->htotal, map->htotal);
 	PSB_WVDC32(pipe->hblank, map->hblank);
 	PSB_WVDC32(pipe->hsync, map->hsync);
 	PSB_WVDC32(pipe->vtotal, map->vtotal);
 	PSB_WVDC32(pipe->vblank, map->vblank);
 	PSB_WVDC32(pipe->vsync, map->vsync);
 	PSB_WVDC32(pipe->src, map->src);
 	PSB_WVDC32(pipe->status, map->status);

 	/*set up the plane*/
 	PSB_WVDC32(pipe->stride, map->stride);
 	PSB_WVDC32(pipe->linoff, map->linoff);
 	PSB_WVDC32(pipe->tileoff, map->tileoff);
 	PSB_WVDC32(pipe->size, map->size);
 	PSB_WVDC32(pipe->pos, map->pos);
 	PSB_WVDC32(pipe->surf, map->surf);

 	if (pipenum == 1) {
 		/* restore palette (gamma) */
 		/* udelay(50000); */
 		for (i = 0; i < 256; i++)
 			PSB_WVDC32(pipe->palette[i], map->palette + (i << 2));

 		PSB_WVDC32(regs->savePFIT_CONTROL, PFIT_CONTROL);
 		PSB_WVDC32(regs->savePFIT_PGM_RATIOS, PFIT_PGM_RATIOS);

 		/*TODO: resume HDMI port */

 		/*TODO: resume pipe*/

 		/*enable the plane*/
 		PSB_WVDC32(pipe->cntr & ~DISPLAY_PLANE_ENABLE, map->cntr);

 		return 0;
 	}

 	/*set up pipe related registers*/
 	PSB_WVDC32(mipi_val, mipi_reg);

 	/*setup MIPI adapter + MIPI IP registers*/
 	if (dsi_config)
 		mdfld_dsi_controller_init(dsi_config, pipenum);

 	if (in_atomic() || in_interrupt())
 		mdelay(20);
 	else
 		msleep(20);

 	/*enable the plane*/
 	PSB_WVDC32(pipe->cntr, map->cntr);

 	if (in_atomic() || in_interrupt())
 		mdelay(20);
 	else
 		msleep(20);

 	/* LP Hold Release */
 	temp = REG_READ(mipi_reg);
 	temp |= LP_OUTPUT_HOLD_RELEASE;
 	REG_WRITE(mipi_reg, temp);
 	mdelay(1);


 	/* Set DSI host to exit from Utra Low Power State */
 	temp = REG_READ(device_ready_reg);
 	temp &= ~ULPS_MASK;
 	temp |= 0x3;
 	temp |= EXIT_ULPS_DEV_READY;
 	REG_WRITE(device_ready_reg, temp);
 	mdelay(1);

 	temp = REG_READ(device_ready_reg);
 	temp &= ~ULPS_MASK;
 	temp |= EXITING_ULPS;
 	REG_WRITE(device_ready_reg, temp);
 	mdelay(1);

 	/*enable the pipe*/
 	PSB_WVDC32(pipe->conf, map->conf);

 	/* restore palette (gamma) */
 	/* udelay(50000); */
 	for (i = 0; i < 256; i++)
 		PSB_WVDC32(pipe->palette[i], map->palette + (i << 2));

 	return 0;
 }

 static int mdfld_save_registers(struct drm_device *dev)
 {
 	/* mdfld_save_cursor_overlay_registers(dev); */
 	mdfld_save_display_registers(dev, 0);
 	mdfld_save_display_registers(dev, 2);
 	mdfld_disable_crtc(dev, 0);
 	mdfld_disable_crtc(dev, 2);

 	return 0;
 }

 static int mdfld_restore_registers(struct drm_device *dev)
 {
 	mdfld_restore_display_registers(dev, 2);
 	mdfld_restore_display_registers(dev, 0);
 	/* mdfld_restore_cursor_overlay_registers(dev); */

 	return 0;
 }

 static int mdfld_power_down(struct drm_device *dev)
 {
 	/* FIXME */
 	return 0;
 }

 static int mdfld_power_up(struct drm_device *dev)
 {
 	/* FIXME */
 	return 0;
 }

 /* Medfield  */
 static const struct psb_offset mdfld_regmap[3] = {
 	{
 		.fp0 = MRST_FPA0,
 		.fp1 = MRST_FPA1,
 		.cntr = DSPACNTR,
 		.conf = PIPEACONF,
 		.src = PIPEASRC,
 		.dpll = MRST_DPLL_A,
 		.htotal = HTOTAL_A,
 		.hblank = HBLANK_A,
 		.hsync = HSYNC_A,
 		.vtotal = VTOTAL_A,
 		.vblank = VBLANK_A,
 		.vsync = VSYNC_A,
 		.stride = DSPASTRIDE,
 		.size = DSPASIZE,
 		.pos = DSPAPOS,
 		.surf = DSPASURF,
 		.addr = MRST_DSPABASE,
 		.status = PIPEASTAT,
 		.linoff = DSPALINOFF,
 		.tileoff = DSPATILEOFF,
 		.palette = PALETTE_A,
 	},
 	{
 		.fp0 = MDFLD_DPLL_DIV0,
 		.cntr = DSPBCNTR,
 		.conf = PIPEBCONF,
 		.src = PIPEBSRC,
 		.dpll = MDFLD_DPLL_B,
 		.htotal = HTOTAL_B,
 		.hblank = HBLANK_B,
 		.hsync = HSYNC_B,
 		.vtotal = VTOTAL_B,
 		.vblank = VBLANK_B,
 		.vsync = VSYNC_B,
 		.stride = DSPBSTRIDE,
 		.size = DSPBSIZE,
 		.pos = DSPBPOS,
 		.surf = DSPBSURF,
 		.addr = MRST_DSPBBASE,
 		.status = PIPEBSTAT,
 		.linoff = DSPBLINOFF,
 		.tileoff = DSPBTILEOFF,
 		.palette = PALETTE_B,
 	},
 	{
 		.fp0 = MRST_FPA0,	/* This is what the old code did ?? */
 		.cntr = DSPCCNTR,
 		.conf = PIPECCONF,
 		.src = PIPECSRC,
 		/* No DPLL_C */
 		.dpll = MRST_DPLL_A,
 		.htotal = HTOTAL_C,
 		.hblank = HBLANK_C,
 		.hsync = HSYNC_C,
 		.vtotal = VTOTAL_C,
 		.vblank = VBLANK_C,
 		.vsync = VSYNC_C,
 		.stride = DSPCSTRIDE,
 		.size = DSPBSIZE,
 		.pos = DSPCPOS,
 		.surf = DSPCSURF,
 		.addr = MDFLD_DSPCBASE,
 		.status = PIPECSTAT,
 		.linoff = DSPCLINOFF,
 		.tileoff = DSPCTILEOFF,
 		.palette = PALETTE_C,
 	},
 };

 static int mdfld_chip_setup(struct drm_device *dev)
 {
 	struct drm_psb_private *dev_priv = dev->dev_private;
 	if (pci_enable_msi(dev->pdev))
 		dev_warn(dev->dev, "Enabling MSI failed!\n");
 	dev_priv->regmap = mdfld_regmap;
 	return mid_chip_setup(dev);
 }

 const struct psb_ops mdfld_chip_ops = {
 	.name = "mdfld",
 	.accel_2d = 0,
 	.pipes = 3,
 	.crtcs = 3,
 	.lvds_mask = (1 << 1),
 	.hdmi_mask = (1 << 1),
 	.cursor_needs_phys = 0,
 	.sgx_offset = MRST_SGX_OFFSET,

 	.chip_setup = mdfld_chip_setup,
 	.crtc_helper = &mdfld_helper_funcs,
 	.crtc_funcs = &psb_intel_crtc_funcs,

 	.output_init = mdfld_output_init,

 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 	.backlight_init = mdfld_backlight_init,
 #endif

 	.save_regs = mdfld_save_registers,
 	.restore_regs = mdfld_restore_registers,
 	.save_crtc = gma_crtc_save,
 	.restore_crtc = gma_crtc_restore,
 	.power_down = mdfld_power_down,
 	.power_up = mdfld_power_up,
 };
	// SPDX-License-Identifier: GPL-2.0-only
	/**************************************************************************
	* Copyright (c) 2011, Intel Corporation.
	* All Rights Reserved.
	*
	**************************************************************************/

	#include <linux/delay.h>

	#include <asm/intel_scu_ipc.h>

	#include "mdfld_dsi_output.h"
	#include "mdfld_output.h"
	#include "mid_bios.h"
	#include "psb_drv.h"
	#include "tc35876x-dsi-lvds.h"

	#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE

	#define MRST_BLC_MAX_PWM_REG_FREQ 0xFFFF
	#define BLC_PWM_PRECISION_FACTOR 100 /* 10000000 */
	#define BLC_PWM_FREQ_CALC_CONSTANT 32
	#define MHz 1000000
	#define BRIGHTNESS_MIN_LEVEL 1
	#define BRIGHTNESS_MAX_LEVEL 100
	#define BRIGHTNESS_MASK 0xFF
	#define BLC_POLARITY_NORMAL 0
	#define BLC_POLARITY_INVERSE 1
	#define BLC_ADJUSTMENT_MAX 100

	#define MDFLD_BLC_PWM_PRECISION_FACTOR 10
	#define MDFLD_BLC_MAX_PWM_REG_FREQ 0xFFFE
	#define MDFLD_BLC_MIN_PWM_REG_FREQ 0x2

	#define MDFLD_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
	#define MDFLD_BACKLIGHT_PWM_CTL_SHIFT (16)

	static struct backlight_device *mdfld_backlight_device;

	int mdfld_set_brightness(struct backlight_device *bd)
	{
	struct drm_device *dev =
	(struct drm_device *)bl_get_data(mdfld_backlight_device);
	struct drm_psb_private *dev_priv = dev->dev_private;
	int level = bd->props.brightness;

	DRM_DEBUG_DRIVER("backlight level set to %d\n", level);

	/* Perform value bounds checking */
	if (level < BRIGHTNESS_MIN_LEVEL)
	level = BRIGHTNESS_MIN_LEVEL;

	if (gma_power_begin(dev, false)) {
	u32 adjusted_level = 0;

	/*
	* Adjust the backlight level with the percent in
	* dev_priv->blc_adj2
	*/
	adjusted_level = level * dev_priv->blc_adj2;
	adjusted_level = adjusted_level / BLC_ADJUSTMENT_MAX;
	dev_priv->brightness_adjusted = adjusted_level;

	if (mdfld_get_panel_type(dev, 0) == TC35876X) {
	if (dev_priv->dpi_panel_on[0] \|\|
	dev_priv->dpi_panel_on[2])
	tc35876x_brightness_control(dev,
	dev_priv->brightness_adjusted);
	} else {
	if (dev_priv->dpi_panel_on[0])
	mdfld_dsi_brightness_control(dev, 0,
	dev_priv->brightness_adjusted);
	}

	if (dev_priv->dpi_panel_on[2])
	mdfld_dsi_brightness_control(dev, 2,
	dev_priv->brightness_adjusted);
	gma_power_end(dev);
	}

	/* cache the brightness for later use */
	dev_priv->brightness = level;
	return 0;
	}

	static int mdfld_get_brightness(struct backlight_device *bd)
	{
	struct drm_device *dev =
	(struct drm_device *)bl_get_data(mdfld_backlight_device);
	struct drm_psb_private *dev_priv = dev->dev_private;

	DRM_DEBUG_DRIVER("brightness = 0x%x \n", dev_priv->brightness);

	/* return locally cached var instead of HW read (due to DPST etc.) */
	return dev_priv->brightness;
	}

	static const struct backlight_ops mdfld_ops = {
	.get_brightness = mdfld_get_brightness,
	.update_status = mdfld_set_brightness,
	};

	static int device_backlight_init(struct drm_device *dev)
	{
	struct drm_psb_private dev_priv = (struct drm_psb_private )
	dev->dev_private;

	dev_priv->blc_adj1 = BLC_ADJUSTMENT_MAX;
	dev_priv->blc_adj2 = BLC_ADJUSTMENT_MAX;

	return 0;
	}

	static int mdfld_backlight_init(struct drm_device *dev)
	{
	struct backlight_properties props;
	int ret = 0;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.max_brightness = BRIGHTNESS_MAX_LEVEL;
	props.type = BACKLIGHT_PLATFORM;
	mdfld_backlight_device = backlight_device_register("mdfld-bl",
	NULL, (void *)dev, &mdfld_ops, &props);

	if (IS_ERR(mdfld_backlight_device))
	return PTR_ERR(mdfld_backlight_device);

	ret = device_backlight_init(dev);
	if (ret)
	return ret;

	mdfld_backlight_device->props.brightness = BRIGHTNESS_MAX_LEVEL;
	mdfld_backlight_device->props.max_brightness = BRIGHTNESS_MAX_LEVEL;
	backlight_update_status(mdfld_backlight_device);
	return 0;
	}
	#endif

	struct backlight_device *mdfld_get_backlight_device(void)
	{
	#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
	return mdfld_backlight_device;
	#else
	return NULL;
	#endif
	}

	/*
	* mdfld_save_display_registers
	*
	* Description: We are going to suspend so save current display
	* register state.
	*
	* Notes: FIXME_JLIU7 need to add the support for DPI MIPI & HDMI audio
	*/
	static int mdfld_save_display_registers(struct drm_device *dev, int pipenum)
	{
	struct drm_psb_private *dev_priv = dev->dev_private;
	struct medfield_state *regs = &dev_priv->regs.mdfld;
	struct psb_pipe *pipe = &dev_priv->regs.pipe[pipenum];
	const struct psb_offset *map = &dev_priv->regmap[pipenum];
	int i;
	u32 *mipi_val;

	/* register */
	u32 mipi_reg = MIPI;

	switch (pipenum) {
	case 0:
	mipi_val = &regs->saveMIPI;
	break;
	case 1:
	mipi_val = &regs->saveMIPI;
	break;
	case 2:
	/* register */
	mipi_reg = MIPI_C;
	/* pointer to values */
	mipi_val = &regs->saveMIPI_C;
	break;
	default:
	DRM_ERROR("%s, invalid pipe number.\n", __func__);
	return -EINVAL;
	}

	/* Pipe & plane A info */
	pipe->dpll = PSB_RVDC32(map->dpll);
	pipe->fp0 = PSB_RVDC32(map->fp0);
	pipe->conf = PSB_RVDC32(map->conf);
	pipe->htotal = PSB_RVDC32(map->htotal);
	pipe->hblank = PSB_RVDC32(map->hblank);
	pipe->hsync = PSB_RVDC32(map->hsync);
	pipe->vtotal = PSB_RVDC32(map->vtotal);
	pipe->vblank = PSB_RVDC32(map->vblank);
	pipe->vsync = PSB_RVDC32(map->vsync);
	pipe->src = PSB_RVDC32(map->src);
	pipe->stride = PSB_RVDC32(map->stride);
	pipe->linoff = PSB_RVDC32(map->linoff);
	pipe->tileoff = PSB_RVDC32(map->tileoff);
	pipe->size = PSB_RVDC32(map->size);
	pipe->pos = PSB_RVDC32(map->pos);
	pipe->surf = PSB_RVDC32(map->surf);
	pipe->cntr = PSB_RVDC32(map->cntr);
	pipe->status = PSB_RVDC32(map->status);

	/save palette (gamma) /
	for (i = 0; i < 256; i++)
	pipe->palette[i] = PSB_RVDC32(map->palette + (i << 2));

	if (pipenum == 1) {
	regs->savePFIT_CONTROL = PSB_RVDC32(PFIT_CONTROL);
	regs->savePFIT_PGM_RATIOS = PSB_RVDC32(PFIT_PGM_RATIOS);

	regs->saveHDMIPHYMISCCTL = PSB_RVDC32(HDMIPHYMISCCTL);
	regs->saveHDMIB_CONTROL = PSB_RVDC32(HDMIB_CONTROL);
	return 0;
	}

	*mipi_val = PSB_RVDC32(mipi_reg);
	return 0;
	}

	/*
	* mdfld_restore_display_registers
	*
	* Description: We are going to resume so restore display register state.
	*
	* Notes: FIXME_JLIU7 need to add the support for DPI MIPI & HDMI audio
	*/
	static int mdfld_restore_display_registers(struct drm_device *dev, int pipenum)
	{
	/* To get panel out of ULPS mode. */
	u32 temp = 0;
	u32 device_ready_reg = DEVICE_READY_REG;
	struct drm_psb_private *dev_priv = dev->dev_private;
	struct mdfld_dsi_config *dsi_config = NULL;
	struct medfield_state *regs = &dev_priv->regs.mdfld;
	struct psb_pipe *pipe = &dev_priv->regs.pipe[pipenum];
	const struct psb_offset *map = &dev_priv->regmap[pipenum];
	u32 i;
	u32 dpll;
	u32 timeout = 0;

	/* register */
	u32 mipi_reg = MIPI;

	/* values */
	u32 dpll_val = pipe->dpll;
	u32 mipi_val = regs->saveMIPI;

	switch (pipenum) {
	case 0:
	dpll_val &= ~DPLL_VCO_ENABLE;
	dsi_config = dev_priv->dsi_configs[0];
	break;
	case 1:
	dpll_val &= ~DPLL_VCO_ENABLE;
	break;
	case 2:
	mipi_reg = MIPI_C;
	mipi_val = regs->saveMIPI_C;
	dsi_config = dev_priv->dsi_configs[1];
	break;
	default:
	DRM_ERROR("%s, invalid pipe number.\n", __func__);
	return -EINVAL;
	}

	/make sure VGA plane is off. it initializes to on after reset!/
	PSB_WVDC32(0x80000000, VGACNTRL);

	if (pipenum == 1) {
	PSB_WVDC32(dpll_val & ~DPLL_VCO_ENABLE, map->dpll);
	PSB_RVDC32(map->dpll);

	PSB_WVDC32(pipe->fp0, map->fp0);
	} else {

	dpll = PSB_RVDC32(map->dpll);

	if (!(dpll & DPLL_VCO_ENABLE)) {

	/* When ungating power of DPLL, needs to wait 0.5us
	before enable the VCO */
	if (dpll & MDFLD_PWR_GATE_EN) {
	dpll &= ~MDFLD_PWR_GATE_EN;
	PSB_WVDC32(dpll, map->dpll);
	/* FIXME_MDFLD PO - change 500 to 1 after PO */
	udelay(500);
	}

	PSB_WVDC32(pipe->fp0, map->fp0);
	PSB_WVDC32(dpll_val, map->dpll);
	/* FIXME_MDFLD PO - change 500 to 1 after PO */
	udelay(500);

	dpll_val \|= DPLL_VCO_ENABLE;
	PSB_WVDC32(dpll_val, map->dpll);
	PSB_RVDC32(map->dpll);

	/* wait for DSI PLL to lock */
	while (timeout < 20000 &&
	!(PSB_RVDC32(map->conf) & PIPECONF_DSIPLL_LOCK)) {
	udelay(150);
	timeout++;
	}

	if (timeout == 20000) {
	DRM_ERROR("%s, can't lock DSIPLL.\n",
	__func__);
	return -EINVAL;
	}
	}
	}
	/* Restore mode */
	PSB_WVDC32(pipe->htotal, map->htotal);
	PSB_WVDC32(pipe->hblank, map->hblank);
	PSB_WVDC32(pipe->hsync, map->hsync);
	PSB_WVDC32(pipe->vtotal, map->vtotal);
	PSB_WVDC32(pipe->vblank, map->vblank);
	PSB_WVDC32(pipe->vsync, map->vsync);
	PSB_WVDC32(pipe->src, map->src);
	PSB_WVDC32(pipe->status, map->status);

	/set up the plane/
	PSB_WVDC32(pipe->stride, map->stride);
	PSB_WVDC32(pipe->linoff, map->linoff);
	PSB_WVDC32(pipe->tileoff, map->tileoff);
	PSB_WVDC32(pipe->size, map->size);
	PSB_WVDC32(pipe->pos, map->pos);
	PSB_WVDC32(pipe->surf, map->surf);

	if (pipenum == 1) {
	/* restore palette (gamma) */
	/* udelay(50000); */
	for (i = 0; i < 256; i++)
	PSB_WVDC32(pipe->palette[i], map->palette + (i << 2));

	PSB_WVDC32(regs->savePFIT_CONTROL, PFIT_CONTROL);
	PSB_WVDC32(regs->savePFIT_PGM_RATIOS, PFIT_PGM_RATIOS);

	/TODO: resume HDMI port /

	/TODO: resume pipe/

	/enable the plane/
	PSB_WVDC32(pipe->cntr & ~DISPLAY_PLANE_ENABLE, map->cntr);

	return 0;
	}

	/set up pipe related registers/
	PSB_WVDC32(mipi_val, mipi_reg);

	/setup MIPI adapter + MIPI IP registers/
	if (dsi_config)
	mdfld_dsi_controller_init(dsi_config, pipenum);

	if (in_atomic() \|\| in_interrupt())
	mdelay(20);
	else
	msleep(20);

	/enable the plane/
	PSB_WVDC32(pipe->cntr, map->cntr);

	if (in_atomic() \|\| in_interrupt())
	mdelay(20);
	else
	msleep(20);

	/* LP Hold Release */
	temp = REG_READ(mipi_reg);
	temp \|= LP_OUTPUT_HOLD_RELEASE;
	REG_WRITE(mipi_reg, temp);
	mdelay(1);


	/* Set DSI host to exit from Utra Low Power State */
	temp = REG_READ(device_ready_reg);
	temp &= ~ULPS_MASK;
	temp \|= 0x3;
	temp \|= EXIT_ULPS_DEV_READY;
	REG_WRITE(device_ready_reg, temp);
	mdelay(1);

	temp = REG_READ(device_ready_reg);
	temp &= ~ULPS_MASK;
	temp \|= EXITING_ULPS;
	REG_WRITE(device_ready_reg, temp);
	mdelay(1);

	/enable the pipe/
	PSB_WVDC32(pipe->conf, map->conf);

	/* restore palette (gamma) */
	/* udelay(50000); */
	for (i = 0; i < 256; i++)
	PSB_WVDC32(pipe->palette[i], map->palette + (i << 2));

	return 0;
	}

	static int mdfld_save_registers(struct drm_device *dev)
	{
	/* mdfld_save_cursor_overlay_registers(dev); */
	mdfld_save_display_registers(dev, 0);
	mdfld_save_display_registers(dev, 2);
	mdfld_disable_crtc(dev, 0);
	mdfld_disable_crtc(dev, 2);

	return 0;
	}

	static int mdfld_restore_registers(struct drm_device *dev)
	{
	mdfld_restore_display_registers(dev, 2);
	mdfld_restore_display_registers(dev, 0);
	/* mdfld_restore_cursor_overlay_registers(dev); */

	return 0;
	}

	static int mdfld_power_down(struct drm_device *dev)
	{
	/* FIXME */
	return 0;
	}

	static int mdfld_power_up(struct drm_device *dev)
	{
	/* FIXME */
	return 0;
	}

	/* Medfield */
	static const struct psb_offset mdfld_regmap[3] = {
	{
	.fp0 = MRST_FPA0,
	.fp1 = MRST_FPA1,
	.cntr = DSPACNTR,
	.conf = PIPEACONF,
	.src = PIPEASRC,
	.dpll = MRST_DPLL_A,
	.htotal = HTOTAL_A,
	.hblank = HBLANK_A,
	.hsync = HSYNC_A,
	.vtotal = VTOTAL_A,
	.vblank = VBLANK_A,
	.vsync = VSYNC_A,
	.stride = DSPASTRIDE,
	.size = DSPASIZE,
	.pos = DSPAPOS,
	.surf = DSPASURF,
	.addr = MRST_DSPABASE,
	.status = PIPEASTAT,
	.linoff = DSPALINOFF,
	.tileoff = DSPATILEOFF,
	.palette = PALETTE_A,
	},
	{
	.fp0 = MDFLD_DPLL_DIV0,
	.cntr = DSPBCNTR,
	.conf = PIPEBCONF,
	.src = PIPEBSRC,
	.dpll = MDFLD_DPLL_B,
	.htotal = HTOTAL_B,
	.hblank = HBLANK_B,
	.hsync = HSYNC_B,
	.vtotal = VTOTAL_B,
	.vblank = VBLANK_B,
	.vsync = VSYNC_B,
	.stride = DSPBSTRIDE,
	.size = DSPBSIZE,
	.pos = DSPBPOS,
	.surf = DSPBSURF,
	.addr = MRST_DSPBBASE,
	.status = PIPEBSTAT,
	.linoff = DSPBLINOFF,
	.tileoff = DSPBTILEOFF,
	.palette = PALETTE_B,
	},
	{
	.fp0 = MRST_FPA0, /* This is what the old code did ?? */
	.cntr = DSPCCNTR,
	.conf = PIPECCONF,
	.src = PIPECSRC,
	/* No DPLL_C */
	.dpll = MRST_DPLL_A,
	.htotal = HTOTAL_C,
	.hblank = HBLANK_C,
	.hsync = HSYNC_C,
	.vtotal = VTOTAL_C,
	.vblank = VBLANK_C,
	.vsync = VSYNC_C,
	.stride = DSPCSTRIDE,
	.size = DSPBSIZE,
	.pos = DSPCPOS,
	.surf = DSPCSURF,
	.addr = MDFLD_DSPCBASE,
	.status = PIPECSTAT,
	.linoff = DSPCLINOFF,
	.tileoff = DSPCTILEOFF,
	.palette = PALETTE_C,
	},
	};

	static int mdfld_chip_setup(struct drm_device *dev)
	{
	struct drm_psb_private *dev_priv = dev->dev_private;
	if (pci_enable_msi(dev->pdev))
	dev_warn(dev->dev, "Enabling MSI failed!\n");
	dev_priv->regmap = mdfld_regmap;
	return mid_chip_setup(dev);
	}

	const struct psb_ops mdfld_chip_ops = {
	.name = "mdfld",
	.accel_2d = 0,
	.pipes = 3,
	.crtcs = 3,
	.lvds_mask = (1 << 1),
	.hdmi_mask = (1 << 1),
	.cursor_needs_phys = 0,
	.sgx_offset = MRST_SGX_OFFSET,

	.chip_setup = mdfld_chip_setup,
	.crtc_helper = &mdfld_helper_funcs,
	.crtc_funcs = &psb_intel_crtc_funcs,

	.output_init = mdfld_output_init,

	#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
	.backlight_init = mdfld_backlight_init,
	#endif

	.save_regs = mdfld_save_registers,
	.restore_regs = mdfld_restore_registers,
	.save_crtc = gma_crtc_save,
	.restore_crtc = gma_crtc_restore,
	.power_down = mdfld_power_down,
	.power_up = mdfld_power_up,
	};