drivers/gpu/drm/gma500/psb_intel_display.c

/*
 * Copyright © 2006-2011 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Authors:
 *	Eric Anholt <eric@anholt.net>
 */

#include <linux/i2c.h>
#include <linux/pm_runtime.h>

#include <drm/drmP.h>
#include "framebuffer.h"
#include "psb_drv.h"
#include "psb_intel_drv.h"
#include "psb_intel_reg.h"
#include "psb_intel_display.h"
#include "power.h"

struct psb_intel_clock_t {
	/* given values */
	int n;
	int m1, m2;
	int p1, p2;
	/* derived values */
	int dot;
	int vco;
	int m;
	int p;
};

struct psb_intel_range_t {
	int min, max;
};

struct psb_intel_p2_t {
	int dot_limit;
	int p2_slow, p2_fast;
};

struct psb_intel_limit_t {
	struct psb_intel_range_t dot, vco, n, m, m1, m2, p, p1;
	struct psb_intel_p2_t p2;
};

#define INTEL_LIMIT_I9XX_SDVO_DAC   0
#define INTEL_LIMIT_I9XX_LVDS	    1

static const struct psb_intel_limit_t psb_intel_limits[] = {
	{			/* INTEL_LIMIT_I9XX_SDVO_DAC */
	 .dot = {.min = 20000, .max = 400000},
	 .vco = {.min = 1400000, .max = 2800000},
	 .n = {.min = 1, .max = 6},
	 .m = {.min = 70, .max = 120},
	 .m1 = {.min = 8, .max = 18},
	 .m2 = {.min = 3, .max = 7},
	 .p = {.min = 5, .max = 80},
	 .p1 = {.min = 1, .max = 8},
	 .p2 = {.dot_limit = 200000,
		.p2_slow = 10, .p2_fast = 5},
	 },
	{			/* INTEL_LIMIT_I9XX_LVDS */
	 .dot = {.min = 20000, .max = 400000},
	 .vco = {.min = 1400000, .max = 2800000},
	 .n = {.min = 1, .max = 6},
	 .m = {.min = 70, .max = 120},
	 .m1 = {.min = 8, .max = 18},
	 .m2 = {.min = 3, .max = 7},
	 .p = {.min = 7, .max = 98},
	 .p1 = {.min = 1, .max = 8},
	 /* The single-channel range is 25-112Mhz, and dual-channel
	  * is 80-224Mhz.  Prefer single channel as much as possible.
	  */
	 .p2 = {.dot_limit = 112000,
		.p2_slow = 14, .p2_fast = 7},
	 },
};

static const struct psb_intel_limit_t *psb_intel_limit(struct drm_crtc *crtc)
{
	const struct psb_intel_limit_t *limit;

	if (psb_intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
		limit = &psb_intel_limits[INTEL_LIMIT_I9XX_LVDS];
	else
		limit = &psb_intel_limits[INTEL_LIMIT_I9XX_SDVO_DAC];
	return limit;
}

static void psb_intel_clock(int refclk, struct psb_intel_clock_t *clock)
{
	clock->m = 5 * (clock->m1 + 2) + (clock->m2 + 2);
	clock->p = clock->p1 * clock->p2;
	clock->vco = refclk * clock->m / (clock->n + 2);
	clock->dot = clock->vco / clock->p;
}

/**
 * Returns whether any output on the specified pipe is of the specified type
 */
bool psb_intel_pipe_has_type(struct drm_crtc *crtc, int type)
{
	struct drm_device *dev = crtc->dev;
	struct drm_mode_config *mode_config = &dev->mode_config;
	struct drm_connector *l_entry;

	list_for_each_entry(l_entry, &mode_config->connector_list, head) {
		if (l_entry->encoder && l_entry->encoder->crtc == crtc) {
			struct psb_intel_encoder *psb_intel_encoder =
					psb_intel_attached_encoder(l_entry);
			if (psb_intel_encoder->type == type)
				return true;
		}
	}
	return false;
}

#define INTELPllInvalid(s)   { /* ErrorF (s) */; return false; }
/**
 * Returns whether the given set of divisors are valid for a given refclk with
 * the given connectors.
 */

static bool psb_intel_PLL_is_valid(struct drm_crtc *crtc,
			       struct psb_intel_clock_t *clock)
{
	const struct psb_intel_limit_t *limit = psb_intel_limit(crtc);

	if (clock->p1 < limit->p1.min || limit->p1.max < clock->p1)
		INTELPllInvalid("p1 out of range\n");
	if (clock->p < limit->p.min || limit->p.max < clock->p)
		INTELPllInvalid("p out of range\n");
	if (clock->m2 < limit->m2.min || limit->m2.max < clock->m2)
		INTELPllInvalid("m2 out of range\n");
	if (clock->m1 < limit->m1.min || limit->m1.max < clock->m1)
		INTELPllInvalid("m1 out of range\n");
	if (clock->m1 <= clock->m2)
		INTELPllInvalid("m1 <= m2\n");
	if (clock->m < limit->m.min || limit->m.max < clock->m)
		INTELPllInvalid("m out of range\n");
	if (clock->n < limit->n.min || limit->n.max < clock->n)
		INTELPllInvalid("n out of range\n");
	if (clock->vco < limit->vco.min || limit->vco.max < clock->vco)
		INTELPllInvalid("vco out of range\n");
	/* XXX: We may need to be checking "Dot clock"
	 * depending on the multiplier, connector, etc.,
	 * rather than just a single range.
	 */
	if (clock->dot < limit->dot.min || limit->dot.max < clock->dot)
		INTELPllInvalid("dot out of range\n");

	return true;
}

/**
 * Returns a set of divisors for the desired target clock with the given
 * refclk, or FALSE.  The returned values represent the clock equation:
 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
 */
static bool psb_intel_find_best_PLL(struct drm_crtc *crtc, int target,
				int refclk,
				struct psb_intel_clock_t *best_clock)
{
	struct drm_device *dev = crtc->dev;
	struct psb_intel_clock_t clock;
	const struct psb_intel_limit_t *limit = psb_intel_limit(crtc);
	int err = target;

	if (psb_intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) &&
	    (REG_READ(LVDS) & LVDS_PORT_EN) != 0) {
		/*
		 * For LVDS, if the panel is on, just rely on its current
		 * settings for dual-channel.  We haven't figured out how to
		 * reliably set up different single/dual channel state, if we
		 * even can.
		 */
		if ((REG_READ(LVDS) & LVDS_CLKB_POWER_MASK) ==
		    LVDS_CLKB_POWER_UP)
			clock.p2 = limit->p2.p2_fast;
		else
			clock.p2 = limit->p2.p2_slow;
	} else {
		if (target < limit->p2.dot_limit)
			clock.p2 = limit->p2.p2_slow;
		else
			clock.p2 = limit->p2.p2_fast;
	}

	memset(best_clock, 0, sizeof(*best_clock));

	for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max;
	     clock.m1++) {
		for (clock.m2 = limit->m2.min;
		     clock.m2 < clock.m1 && clock.m2 <= limit->m2.max;
		     clock.m2++) {
			for (clock.n = limit->n.min;
			     clock.n <= limit->n.max; clock.n++) {
				for (clock.p1 = limit->p1.min;
				     clock.p1 <= limit->p1.max;
				     clock.p1++) {
					int this_err;

					psb_intel_clock(refclk, &clock);

					if (!psb_intel_PLL_is_valid
					    (crtc, &clock))
						continue;

					this_err = abs(clock.dot - target);
					if (this_err < err) {
						*best_clock = clock;
						err = this_err;
					}
				}
			}
		}
	}

	return err != target;
}

void psb_intel_wait_for_vblank(struct drm_device *dev)
{
	/* Wait for 20ms, i.e. one cycle at 50hz. */
	mdelay(20);
}

static int psb_intel_pipe_set_base(struct drm_crtc *crtc,
			    int x, int y, struct drm_framebuffer *old_fb)
{
	struct drm_device *dev = crtc->dev;
	struct drm_psb_private *dev_priv = dev->dev_private;
	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
	struct psb_framebuffer *psbfb = to_psb_fb(crtc->fb);
	int pipe = psb_intel_crtc->pipe;
	const struct psb_offset *map = &dev_priv->regmap[pipe];
	unsigned long start, offset;
	u32 dspcntr;
	int ret = 0;

	if (!gma_power_begin(dev, true))
		return 0;

	/* no fb bound */
	if (!crtc->fb) {
		dev_dbg(dev->dev, "No FB bound\n");
		goto psb_intel_pipe_cleaner;
	}

	/* We are displaying this buffer, make sure it is actually loaded
	   into the GTT */
	ret = psb_gtt_pin(psbfb->gtt);
	if (ret < 0)
		goto psb_intel_pipe_set_base_exit;
	start = psbfb->gtt->offset;

	offset = y * crtc->fb->pitches[0] + x * (crtc->fb->bits_per_pixel / 8);

	REG_WRITE(map->stride, crtc->fb->pitches[0]);

	dspcntr = REG_READ(map->cntr);
	dspcntr &= ~DISPPLANE_PIXFORMAT_MASK;

	switch (crtc->fb->bits_per_pixel) {
	case 8:
		dspcntr |= DISPPLANE_8BPP;
		break;
	case 16:
		if (crtc->fb->depth == 15)
			dspcntr |= DISPPLANE_15_16BPP;
		else
			dspcntr |= DISPPLANE_16BPP;
		break;
	case 24:
	case 32:
		dspcntr |= DISPPLANE_32BPP_NO_ALPHA;
		break;
	default:
		dev_err(dev->dev, "Unknown color depth\n");
		ret = -EINVAL;
		psb_gtt_unpin(psbfb->gtt);
		goto psb_intel_pipe_set_base_exit;
	}
	REG_WRITE(map->cntr, dspcntr);

	REG_WRITE(map->base, start + offset);
	REG_READ(map->base);

psb_intel_pipe_cleaner:
	/* If there was a previous display we can now unpin it */
	if (old_fb)
		psb_gtt_unpin(to_psb_fb(old_fb)->gtt);

psb_intel_pipe_set_base_exit:
	gma_power_end(dev);
	return ret;
}

/**
 * Sets the power management mode of the pipe and plane.
 *
 * This code should probably grow support for turning the cursor off and back
 * on appropriately at the same time as we're turning the pipe off/on.
 */
static void psb_intel_crtc_dpms(struct drm_crtc *crtc, int mode)
{
	struct drm_device *dev = crtc->dev;
	struct drm_psb_private *dev_priv = dev->dev_private;
	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
	int pipe = psb_intel_crtc->pipe;
	const struct psb_offset *map = &dev_priv->regmap[pipe];
	u32 temp;

	/* XXX: When our outputs are all unaware of DPMS modes other than off
	 * and on, we should map those modes to DRM_MODE_DPMS_OFF in the CRTC.
	 */
	switch (mode) {
	case DRM_MODE_DPMS_ON:
	case DRM_MODE_DPMS_STANDBY:
	case DRM_MODE_DPMS_SUSPEND:
		/* Enable the DPLL */
		temp = REG_READ(map->dpll);
		if ((temp & DPLL_VCO_ENABLE) == 0) {
			REG_WRITE(map->dpll, temp);
			REG_READ(map->dpll);
			/* Wait for the clocks to stabilize. */
			udelay(150);
			REG_WRITE(map->dpll, temp | DPLL_VCO_ENABLE);
			REG_READ(map->dpll);
			/* Wait for the clocks to stabilize. */
			udelay(150);
			REG_WRITE(map->dpll, temp | DPLL_VCO_ENABLE);
			REG_READ(map->dpll);
			/* Wait for the clocks to stabilize. */
			udelay(150);
		}

		/* Enable the pipe */
		temp = REG_READ(map->conf);
		if ((temp & PIPEACONF_ENABLE) == 0)
			REG_WRITE(map->conf, temp | PIPEACONF_ENABLE);

		/* Enable the plane */
		temp = REG_READ(map->cntr);
		if ((temp & DISPLAY_PLANE_ENABLE) == 0) {
			REG_WRITE(map->cntr,
				  temp | DISPLAY_PLANE_ENABLE);
			/* Flush the plane changes */
			REG_WRITE(map->base, REG_READ(map->base));
		}

		psb_intel_crtc_load_lut(crtc);

		/* Give the overlay scaler a chance to enable
		 * if it's on this pipe */
		/* psb_intel_crtc_dpms_video(crtc, true); TODO */
		break;
	case DRM_MODE_DPMS_OFF:
		/* Give the overlay scaler a chance to disable
		 * if it's on this pipe */
		/* psb_intel_crtc_dpms_video(crtc, FALSE); TODO */

		/* Disable the VGA plane that we never use */
		REG_WRITE(VGACNTRL, VGA_DISP_DISABLE);

		/* Disable display plane */
		temp = REG_READ(map->cntr);
		if ((temp & DISPLAY_PLANE_ENABLE) != 0) {
			REG_WRITE(map->cntr,
				  temp & ~DISPLAY_PLANE_ENABLE);
			/* Flush the plane changes */
			REG_WRITE(map->base, REG_READ(map->base));
			REG_READ(map->base);
		}

		/* Next, disable display pipes */
		temp = REG_READ(map->conf);
		if ((temp & PIPEACONF_ENABLE) != 0) {
			REG_WRITE(map->conf, temp & ~PIPEACONF_ENABLE);
			REG_READ(map->conf);
		}

		/* Wait for vblank for the disable to take effect. */
		psb_intel_wait_for_vblank(dev);

		temp = REG_READ(map->dpll);
		if ((temp & DPLL_VCO_ENABLE) != 0) {
			REG_WRITE(map->dpll, temp & ~DPLL_VCO_ENABLE);
			REG_READ(map->dpll);
		}

		/* Wait for the clocks to turn off. */
		udelay(150);
		break;
	}

	/*Set FIFO Watermarks*/
	REG_WRITE(DSPARB, 0x3F3E);
}

static void psb_intel_crtc_prepare(struct drm_crtc *crtc)
{
	struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
	crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
}

static void psb_intel_crtc_commit(struct drm_crtc *crtc)
{
	struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
	crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
}

void psb_intel_encoder_prepare(struct drm_encoder *encoder)
{
	struct drm_encoder_helper_funcs *encoder_funcs =
	    encoder->helper_private;
	/* lvds has its own version of prepare see psb_intel_lvds_prepare */
	encoder_funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
}

void psb_intel_encoder_commit(struct drm_encoder *encoder)
{
	struct drm_encoder_helper_funcs *encoder_funcs =
	    encoder->helper_private;
	/* lvds has its own version of commit see psb_intel_lvds_commit */
	encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
}

void psb_intel_encoder_destroy(struct drm_encoder *encoder)
{
	struct psb_intel_encoder *intel_encoder = to_psb_intel_encoder(encoder);

	drm_encoder_cleanup(encoder);
	kfree(intel_encoder);
}

static bool psb_intel_crtc_mode_fixup(struct drm_crtc *crtc,
				  const struct drm_display_mode *mode,
				  struct drm_display_mode *adjusted_mode)
{
	return true;
}


/**
 * Return the pipe currently connected to the panel fitter,
 * or -1 if the panel fitter is not present or not in use
 */
static int psb_intel_panel_fitter_pipe(struct drm_device *dev)
{
	u32 pfit_control;

	pfit_control = REG_READ(PFIT_CONTROL);

	/* See if the panel fitter is in use */
	if ((pfit_control & PFIT_ENABLE) == 0)
		return -1;
	/* Must be on PIPE 1 for PSB */
	return 1;
}

static int psb_intel_crtc_mode_set(struct drm_crtc *crtc,
			       struct drm_display_mode *mode,
			       struct drm_display_mode *adjusted_mode,
			       int x, int y,
			       struct drm_framebuffer *old_fb)
{
	struct drm_device *dev = crtc->dev;
	struct drm_psb_private *dev_priv = dev->dev_private;
	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
	struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
	int pipe = psb_intel_crtc->pipe;
	const struct psb_offset *map = &dev_priv->regmap[pipe];
	int refclk;
	struct psb_intel_clock_t clock;
	u32 dpll = 0, fp = 0, dspcntr, pipeconf;
	bool ok, is_sdvo = false;
	bool is_lvds = false, is_tv = false;
	struct drm_mode_config *mode_config = &dev->mode_config;
	struct drm_connector *connector;

	/* No scan out no play */
	if (crtc->fb == NULL) {
		crtc_funcs->mode_set_base(crtc, x, y, old_fb);
		return 0;
	}

	list_for_each_entry(connector, &mode_config->connector_list, head) {
		struct psb_intel_encoder *psb_intel_encoder =
					psb_intel_attached_encoder(connector);

		if (!connector->encoder
		    || connector->encoder->crtc != crtc)
			continue;

		switch (psb_intel_encoder->type) {
		case INTEL_OUTPUT_LVDS:
			is_lvds = true;
			break;
		case INTEL_OUTPUT_SDVO:
			is_sdvo = true;
			break;
		case INTEL_OUTPUT_TVOUT:
			is_tv = true;
			break;
		}
	}

	refclk = 96000;

	ok = psb_intel_find_best_PLL(crtc, adjusted_mode->clock, refclk,
				 &clock);
	if (!ok) {
		dev_err(dev->dev, "Couldn't find PLL settings for mode!\n");
		return 0;
	}

	fp = clock.n << 16 | clock.m1 << 8 | clock.m2;

	dpll = DPLL_VGA_MODE_DIS;
	if (is_lvds) {
		dpll |= DPLLB_MODE_LVDS;
		dpll |= DPLL_DVO_HIGH_SPEED;
	} else
		dpll |= DPLLB_MODE_DAC_SERIAL;
	if (is_sdvo) {
		int sdvo_pixel_multiply =
			    adjusted_mode->clock / mode->clock;
		dpll |= DPLL_DVO_HIGH_SPEED;
		dpll |=
		    (sdvo_pixel_multiply - 1) << SDVO_MULTIPLIER_SHIFT_HIRES;
	}

	/* compute bitmask from p1 value */
	dpll |= (1 << (clock.p1 - 1)) << 16;
	switch (clock.p2) {
	case 5:
		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
		break;
	case 7:
		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
		break;
	case 10:
		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
		break;
	case 14:
		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
		break;
	}

	if (is_tv) {
		/* XXX: just matching BIOS for now */
/*	dpll |= PLL_REF_INPUT_TVCLKINBC; */
		dpll |= 3;
	}
	dpll |= PLL_REF_INPUT_DREFCLK;

	/* setup pipeconf */
	pipeconf = REG_READ(map->conf);

	/* Set up the display plane register */
	dspcntr = DISPPLANE_GAMMA_ENABLE;

	if (pipe == 0)
		dspcntr |= DISPPLANE_SEL_PIPE_A;
	else
		dspcntr |= DISPPLANE_SEL_PIPE_B;

	dspcntr |= DISPLAY_PLANE_ENABLE;
	pipeconf |= PIPEACONF_ENABLE;
	dpll |= DPLL_VCO_ENABLE;


	/* Disable the panel fitter if it was on our pipe */
	if (psb_intel_panel_fitter_pipe(dev) == pipe)
		REG_WRITE(PFIT_CONTROL, 0);

	drm_mode_debug_printmodeline(mode);

	if (dpll & DPLL_VCO_ENABLE) {
		REG_WRITE(map->fp0, fp);
		REG_WRITE(map->dpll, dpll & ~DPLL_VCO_ENABLE);
		REG_READ(map->dpll);
		udelay(150);
	}

	/* The LVDS pin pair needs to be on before the DPLLs are enabled.
	 * This is an exception to the general rule that mode_set doesn't turn
	 * things on.
	 */
	if (is_lvds) {
		u32 lvds = REG_READ(LVDS);

		lvds &= ~LVDS_PIPEB_SELECT;
		if (pipe == 1)
			lvds |= LVDS_PIPEB_SELECT;

		lvds |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
		/* Set the B0-B3 data pairs corresponding to
		 * whether we're going to
		 * set the DPLLs for dual-channel mode or not.
		 */
		lvds &= ~(LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP);
		if (clock.p2 == 7)
			lvds |= LVDS_B0B3_POWER_UP | LVDS_CLKB_POWER_UP;

		/* It would be nice to set 24 vs 18-bit mode (LVDS_A3_POWER_UP)
		 * appropriately here, but we need to look more
		 * thoroughly into how panels behave in the two modes.
		 */

		REG_WRITE(LVDS, lvds);
		REG_READ(LVDS);
	}

	REG_WRITE(map->fp0, fp);
	REG_WRITE(map->dpll, dpll);
	REG_READ(map->dpll);
	/* Wait for the clocks to stabilize. */
	udelay(150);

	/* write it again -- the BIOS does, after all */
	REG_WRITE(map->dpll, dpll);

	REG_READ(map->dpll);
	/* Wait for the clocks to stabilize. */
	udelay(150);

	REG_WRITE(map->htotal, (adjusted_mode->crtc_hdisplay - 1) |
		  ((adjusted_mode->crtc_htotal - 1) << 16));
	REG_WRITE(map->hblank, (adjusted_mode->crtc_hblank_start - 1) |
		  ((adjusted_mode->crtc_hblank_end - 1) << 16));
	REG_WRITE(map->hsync, (adjusted_mode->crtc_hsync_start - 1) |
		  ((adjusted_mode->crtc_hsync_end - 1) << 16));
	REG_WRITE(map->vtotal, (adjusted_mode->crtc_vdisplay - 1) |
		  ((adjusted_mode->crtc_vtotal - 1) << 16));
	REG_WRITE(map->vblank, (adjusted_mode->crtc_vblank_start - 1) |
		  ((adjusted_mode->crtc_vblank_end - 1) << 16));
	REG_WRITE(map->vsync, (adjusted_mode->crtc_vsync_start - 1) |
		  ((adjusted_mode->crtc_vsync_end - 1) << 16));
	/* pipesrc and dspsize control the size that is scaled from,
	 * which should always be the user's requested size.
	 */
	REG_WRITE(map->size,
		  ((mode->vdisplay - 1) << 16) | (mode->hdisplay - 1));
	REG_WRITE(map->pos, 0);
	REG_WRITE(map->src,
		  ((mode->hdisplay - 1) << 16) | (mode->vdisplay - 1));
	REG_WRITE(map->conf, pipeconf);
	REG_READ(map->conf);

	psb_intel_wait_for_vblank(dev);

	REG_WRITE(map->cntr, dspcntr);

	/* Flush the plane changes */
	crtc_funcs->mode_set_base(crtc, x, y, old_fb);

	psb_intel_wait_for_vblank(dev);

	return 0;
}

/** Loads the palette/gamma unit for the CRTC with the prepared values */
void psb_intel_crtc_load_lut(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_psb_private *dev_priv = dev->dev_private;
	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
	const struct psb_offset *map = &dev_priv->regmap[psb_intel_crtc->pipe];
	int palreg = map->palette;
	int i;

	/* The clocks have to be on to load the palette. */
	if (!crtc->enabled)
		return;

	switch (psb_intel_crtc->pipe) {
	case 0:
	case 1:
		break;
	default:
		dev_err(dev->dev, "Illegal Pipe Number.\n");
		return;
	}

	if (gma_power_begin(dev, false)) {
		for (i = 0; i < 256; i++) {
			REG_WRITE(palreg + 4 * i,
				  ((psb_intel_crtc->lut_r[i] +
				  psb_intel_crtc->lut_adj[i]) << 16) |
				  ((psb_intel_crtc->lut_g[i] +
				  psb_intel_crtc->lut_adj[i]) << 8) |
				  (psb_intel_crtc->lut_b[i] +
				  psb_intel_crtc->lut_adj[i]));
		}
		gma_power_end(dev);
	} else {
		for (i = 0; i < 256; i++) {
			dev_priv->regs.pipe[0].palette[i] =
				  ((psb_intel_crtc->lut_r[i] +
				  psb_intel_crtc->lut_adj[i]) << 16) |
				  ((psb_intel_crtc->lut_g[i] +
				  psb_intel_crtc->lut_adj[i]) << 8) |
				  (psb_intel_crtc->lut_b[i] +
				  psb_intel_crtc->lut_adj[i]);
		}

	}
}

/**
 * Save HW states of giving crtc
 */
static void psb_intel_crtc_save(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_psb_private *dev_priv = dev->dev_private;
	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
	struct psb_intel_crtc_state *crtc_state = psb_intel_crtc->crtc_state;
	const struct psb_offset *map = &dev_priv->regmap[psb_intel_crtc->pipe];
	uint32_t paletteReg;
	int i;

	if (!crtc_state) {
		dev_err(dev->dev, "No CRTC state found\n");
		return;
	}

	crtc_state->saveDSPCNTR = REG_READ(map->cntr);
	crtc_state->savePIPECONF = REG_READ(map->conf);
	crtc_state->savePIPESRC = REG_READ(map->src);
	crtc_state->saveFP0 = REG_READ(map->fp0);
	crtc_state->saveFP1 = REG_READ(map->fp1);
	crtc_state->saveDPLL = REG_READ(map->dpll);
	crtc_state->saveHTOTAL = REG_READ(map->htotal);
	crtc_state->saveHBLANK = REG_READ(map->hblank);
	crtc_state->saveHSYNC = REG_READ(map->hsync);
	crtc_state->saveVTOTAL = REG_READ(map->vtotal);
	crtc_state->saveVBLANK = REG_READ(map->vblank);
	crtc_state->saveVSYNC = REG_READ(map->vsync);
	crtc_state->saveDSPSTRIDE = REG_READ(map->stride);

	/*NOTE: DSPSIZE DSPPOS only for psb*/
	crtc_state->saveDSPSIZE = REG_READ(map->size);
	crtc_state->saveDSPPOS = REG_READ(map->pos);

	crtc_state->saveDSPBASE = REG_READ(map->base);

	paletteReg = map->palette;
	for (i = 0; i < 256; ++i)
		crtc_state->savePalette[i] = REG_READ(paletteReg + (i << 2));
}

/**
 * Restore HW states of giving crtc
 */
static void psb_intel_crtc_restore(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_psb_private *dev_priv = dev->dev_private;
	struct psb_intel_crtc *psb_intel_crtc =  to_psb_intel_crtc(crtc);
	struct psb_intel_crtc_state *crtc_state = psb_intel_crtc->crtc_state;
	const struct psb_offset *map = &dev_priv->regmap[psb_intel_crtc->pipe];
	uint32_t paletteReg;
	int i;

	if (!crtc_state) {
		dev_err(dev->dev, "No crtc state\n");
		return;
	}

	if (crtc_state->saveDPLL & DPLL_VCO_ENABLE) {
		REG_WRITE(map->dpll,
			crtc_state->saveDPLL & ~DPLL_VCO_ENABLE);
		REG_READ(map->dpll);
		udelay(150);
	}

	REG_WRITE(map->fp0, crtc_state->saveFP0);
	REG_READ(map->fp0);

	REG_WRITE(map->fp1, crtc_state->saveFP1);
	REG_READ(map->fp1);

	REG_WRITE(map->dpll, crtc_state->saveDPLL);
	REG_READ(map->dpll);
	udelay(150);

	REG_WRITE(map->htotal, crtc_state->saveHTOTAL);
	REG_WRITE(map->hblank, crtc_state->saveHBLANK);
	REG_WRITE(map->hsync, crtc_state->saveHSYNC);
	REG_WRITE(map->vtotal, crtc_state->saveVTOTAL);
	REG_WRITE(map->vblank, crtc_state->saveVBLANK);
	REG_WRITE(map->vsync, crtc_state->saveVSYNC);
	REG_WRITE(map->stride, crtc_state->saveDSPSTRIDE);

	REG_WRITE(map->size, crtc_state->saveDSPSIZE);
	REG_WRITE(map->pos, crtc_state->saveDSPPOS);

	REG_WRITE(map->src, crtc_state->savePIPESRC);
	REG_WRITE(map->base, crtc_state->saveDSPBASE);
	REG_WRITE(map->conf, crtc_state->savePIPECONF);

	psb_intel_wait_for_vblank(dev);

	REG_WRITE(map->cntr, crtc_state->saveDSPCNTR);
	REG_WRITE(map->base, crtc_state->saveDSPBASE);

	psb_intel_wait_for_vblank(dev);

	paletteReg = map->palette;
	for (i = 0; i < 256; ++i)
		REG_WRITE(paletteReg + (i << 2), crtc_state->savePalette[i]);
}

static int psb_intel_crtc_cursor_set(struct drm_crtc *crtc,
				 struct drm_file *file_priv,
				 uint32_t handle,
				 uint32_t width, uint32_t height)
{
	struct drm_device *dev = crtc->dev;
	struct drm_psb_private *dev_priv = dev->dev_private;
	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
	int pipe = psb_intel_crtc->pipe;
	uint32_t control = (pipe == 0) ? CURACNTR : CURBCNTR;
	uint32_t base = (pipe == 0) ? CURABASE : CURBBASE;
	uint32_t temp;
	size_t addr = 0;
	struct gtt_range *gt;
	struct gtt_range *cursor_gt = psb_intel_crtc->cursor_gt;
	struct drm_gem_object *obj;
	void *tmp_dst, *tmp_src;
	int ret, i, cursor_pages;

	/* if we want to turn of the cursor ignore width and height */
	if (!handle) {
		/* turn off the cursor */
		temp = CURSOR_MODE_DISABLE;

		if (gma_power_begin(dev, false)) {
			REG_WRITE(control, temp);
			REG_WRITE(base, 0);
			gma_power_end(dev);
		}

		/* Unpin the old GEM object */
		if (psb_intel_crtc->cursor_obj) {
			gt = container_of(psb_intel_crtc->cursor_obj,
							struct gtt_range, gem);
			psb_gtt_unpin(gt);
			drm_gem_object_unreference(psb_intel_crtc->cursor_obj);
			psb_intel_crtc->cursor_obj = NULL;
		}

		return 0;
	}

	/* Currently we only support 64x64 cursors */
	if (width != 64 || height != 64) {
		dev_dbg(dev->dev, "we currently only support 64x64 cursors\n");
		return -EINVAL;
	}

	obj = drm_gem_object_lookup(dev, file_priv, handle);
	if (!obj)
		return -ENOENT;

	if (obj->size < width * height * 4) {
		dev_dbg(dev->dev, "buffer is to small\n");
		return -ENOMEM;
	}

	gt = container_of(obj, struct gtt_range, gem);

	/* Pin the memory into the GTT */
	ret = psb_gtt_pin(gt);
	if (ret) {
		dev_err(dev->dev, "Can not pin down handle 0x%x\n", handle);
		return ret;
	}

	if (dev_priv->ops->cursor_needs_phys) {
		if (cursor_gt == NULL) {
			dev_err(dev->dev, "No hardware cursor mem available");
			return -ENOMEM;
		}

		/* Prevent overflow */
		if (gt->npage > 4)
			cursor_pages = 4;
		else
			cursor_pages = gt->npage;

		/* Copy the cursor to cursor mem */
		tmp_dst = dev_priv->vram_addr + cursor_gt->offset;
		for (i = 0; i < cursor_pages; i++) {
			tmp_src = kmap(gt->pages[i]);
			memcpy(tmp_dst, tmp_src, PAGE_SIZE);
			kunmap(gt->pages[i]);
			tmp_dst += PAGE_SIZE;
		}

		addr = psb_intel_crtc->cursor_addr;
	} else {
		addr = gt->offset;      /* Or resource.start ??? */
		psb_intel_crtc->cursor_addr = addr;
	}

	temp = 0;
	/* set the pipe for the cursor */
	temp |= (pipe << 28);
	temp |= CURSOR_MODE_64_ARGB_AX | MCURSOR_GAMMA_ENABLE;

	if (gma_power_begin(dev, false)) {
		REG_WRITE(control, temp);
		REG_WRITE(base, addr);
		gma_power_end(dev);
	}

	/* unpin the old bo */
	if (psb_intel_crtc->cursor_obj) {
		gt = container_of(psb_intel_crtc->cursor_obj,
							struct gtt_range, gem);
		psb_gtt_unpin(gt);
		drm_gem_object_unreference(psb_intel_crtc->cursor_obj);
		psb_intel_crtc->cursor_obj = obj;
	}
	return 0;
}

static int psb_intel_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
{
	struct drm_device *dev = crtc->dev;
	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
	int pipe = psb_intel_crtc->pipe;
	uint32_t temp = 0;
	uint32_t addr;


	if (x < 0) {
		temp |= (CURSOR_POS_SIGN << CURSOR_X_SHIFT);
		x = -x;
	}
	if (y < 0) {
		temp |= (CURSOR_POS_SIGN << CURSOR_Y_SHIFT);
		y = -y;
	}

	temp |= ((x & CURSOR_POS_MASK) << CURSOR_X_SHIFT);
	temp |= ((y & CURSOR_POS_MASK) << CURSOR_Y_SHIFT);

	addr = psb_intel_crtc->cursor_addr;

	if (gma_power_begin(dev, false)) {
		REG_WRITE((pipe == 0) ? CURAPOS : CURBPOS, temp);
		REG_WRITE((pipe == 0) ? CURABASE : CURBBASE, addr);
		gma_power_end(dev);
	}
	return 0;
}

static void psb_intel_crtc_gamma_set(struct drm_crtc *crtc, u16 *red,
			 u16 *green, u16 *blue, uint32_t type, uint32_t size)
{
	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
	int i;

	if (size != 256)
		return;

	for (i = 0; i < 256; i++) {
		psb_intel_crtc->lut_r[i] = red[i] >> 8;
		psb_intel_crtc->lut_g[i] = green[i] >> 8;
		psb_intel_crtc->lut_b[i] = blue[i] >> 8;
	}

	psb_intel_crtc_load_lut(crtc);
}

static int psb_crtc_set_config(struct drm_mode_set *set)
{
	int ret;
	struct drm_device *dev = set->crtc->dev;
	struct drm_psb_private *dev_priv = dev->dev_private;

	if (!dev_priv->rpm_enabled)
		return drm_crtc_helper_set_config(set);

	pm_runtime_forbid(&dev->pdev->dev);
	ret = drm_crtc_helper_set_config(set);
	pm_runtime_allow(&dev->pdev->dev);
	return ret;
}

/* Returns the clock of the currently programmed mode of the given pipe. */
static int psb_intel_crtc_clock_get(struct drm_device *dev,
				struct drm_crtc *crtc)
{
	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
	struct drm_psb_private *dev_priv = dev->dev_private;
	int pipe = psb_intel_crtc->pipe;
	const struct psb_offset *map = &dev_priv->regmap[pipe];
	u32 dpll;
	u32 fp;
	struct psb_intel_clock_t clock;
	bool is_lvds;
	struct psb_pipe *p = &dev_priv->regs.pipe[pipe];

	if (gma_power_begin(dev, false)) {
		dpll = REG_READ(map->dpll);
		if ((dpll & DISPLAY_RATE_SELECT_FPA1) == 0)
			fp = REG_READ(map->fp0);
		else
			fp = REG_READ(map->fp1);
		is_lvds = (pipe == 1) && (REG_READ(LVDS) & LVDS_PORT_EN);
		gma_power_end(dev);
	} else {
		dpll = p->dpll;

		if ((dpll & DISPLAY_RATE_SELECT_FPA1) == 0)
			fp = p->fp0;
		else
		        fp = p->fp1;

		is_lvds = (pipe == 1) && (dev_priv->regs.psb.saveLVDS &
								LVDS_PORT_EN);
	}

	clock.m1 = (fp & FP_M1_DIV_MASK) >> FP_M1_DIV_SHIFT;
	clock.m2 = (fp & FP_M2_DIV_MASK) >> FP_M2_DIV_SHIFT;
	clock.n = (fp & FP_N_DIV_MASK) >> FP_N_DIV_SHIFT;

	if (is_lvds) {
		clock.p1 =
		    ffs((dpll &
			 DPLL_FPA01_P1_POST_DIV_MASK_I830_LVDS) >>
			DPLL_FPA01_P1_POST_DIV_SHIFT);
		clock.p2 = 14;

		if ((dpll & PLL_REF_INPUT_MASK) ==
		    PLLB_REF_INPUT_SPREADSPECTRUMIN) {
			/* XXX: might not be 66MHz */
			psb_intel_clock(66000, &clock);
		} else
			psb_intel_clock(48000, &clock);
	} else {
		if (dpll & PLL_P1_DIVIDE_BY_TWO)
			clock.p1 = 2;
		else {
			clock.p1 =
			    ((dpll &
			      DPLL_FPA01_P1_POST_DIV_MASK_I830) >>
			     DPLL_FPA01_P1_POST_DIV_SHIFT) + 2;
		}
		if (dpll & PLL_P2_DIVIDE_BY_4)
			clock.p2 = 4;
		else
			clock.p2 = 2;

		psb_intel_clock(48000, &clock);
	}

	/* XXX: It would be nice to validate the clocks, but we can't reuse
	 * i830PllIsValid() because it relies on the xf86_config connector
	 * configuration being accurate, which it isn't necessarily.
	 */

	return clock.dot;
}

/** Returns the currently programmed mode of the given pipe. */
struct drm_display_mode *psb_intel_crtc_mode_get(struct drm_device *dev,
					     struct drm_crtc *crtc)
{
	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
	int pipe = psb_intel_crtc->pipe;
	struct drm_display_mode *mode;
	int htot;
	int hsync;
	int vtot;
	int vsync;
	struct drm_psb_private *dev_priv = dev->dev_private;
	struct psb_pipe *p = &dev_priv->regs.pipe[pipe];
	const struct psb_offset *map = &dev_priv->regmap[pipe];

	if (gma_power_begin(dev, false)) {
		htot = REG_READ(map->htotal);
		hsync = REG_READ(map->hsync);
		vtot = REG_READ(map->vtotal);
		vsync = REG_READ(map->vsync);
		gma_power_end(dev);
	} else {
		htot = p->htotal;
		hsync = p->hsync;
		vtot = p->vtotal;
		vsync = p->vsync;
	}

	mode = kzalloc(sizeof(*mode), GFP_KERNEL);
	if (!mode)
		return NULL;

	mode->clock = psb_intel_crtc_clock_get(dev, crtc);
	mode->hdisplay = (htot & 0xffff) + 1;
	mode->htotal = ((htot & 0xffff0000) >> 16) + 1;
	mode->hsync_start = (hsync & 0xffff) + 1;
	mode->hsync_end = ((hsync & 0xffff0000) >> 16) + 1;
	mode->vdisplay = (vtot & 0xffff) + 1;
	mode->vtotal = ((vtot & 0xffff0000) >> 16) + 1;
	mode->vsync_start = (vsync & 0xffff) + 1;
	mode->vsync_end = ((vsync & 0xffff0000) >> 16) + 1;

	drm_mode_set_name(mode);
	drm_mode_set_crtcinfo(mode, 0);

	return mode;
}

static void psb_intel_crtc_destroy(struct drm_crtc *crtc)
{
	struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
	struct gtt_range *gt;

	/* Unpin the old GEM object */
	if (psb_intel_crtc->cursor_obj) {
		gt = container_of(psb_intel_crtc->cursor_obj,
						struct gtt_range, gem);
		psb_gtt_unpin(gt);
		drm_gem_object_unreference(psb_intel_crtc->cursor_obj);
		psb_intel_crtc->cursor_obj = NULL;
	}

	if (psb_intel_crtc->cursor_gt != NULL)
		psb_gtt_free_range(crtc->dev, psb_intel_crtc->cursor_gt);
	kfree(psb_intel_crtc->crtc_state);
	drm_crtc_cleanup(crtc);
	kfree(psb_intel_crtc);
}

const struct drm_crtc_helper_funcs psb_intel_helper_funcs = {
	.dpms = psb_intel_crtc_dpms,
	.mode_fixup = psb_intel_crtc_mode_fixup,
	.mode_set = psb_intel_crtc_mode_set,
	.mode_set_base = psb_intel_pipe_set_base,
	.prepare = psb_intel_crtc_prepare,
	.commit = psb_intel_crtc_commit,
};

const struct drm_crtc_funcs psb_intel_crtc_funcs = {
	.save = psb_intel_crtc_save,
	.restore = psb_intel_crtc_restore,
	.cursor_set = psb_intel_crtc_cursor_set,
	.cursor_move = psb_intel_crtc_cursor_move,
	.gamma_set = psb_intel_crtc_gamma_set,
	.set_config = psb_crtc_set_config,
	.destroy = psb_intel_crtc_destroy,
};

/*
 * Set the default value of cursor control and base register
 * to zero. This is a workaround for h/w defect on Oaktrail
 */
static void psb_intel_cursor_init(struct drm_device *dev,
				  struct psb_intel_crtc *psb_intel_crtc)
{
	struct drm_psb_private *dev_priv = dev->dev_private;
	u32 control[3] = { CURACNTR, CURBCNTR, CURCCNTR };
	u32 base[3] = { CURABASE, CURBBASE, CURCBASE };
	struct gtt_range *cursor_gt;

	if (dev_priv->ops->cursor_needs_phys) {
		/* Allocate 4 pages of stolen mem for a hardware cursor. That
		 * is enough for the 64 x 64 ARGB cursors we support.
		 */
		cursor_gt = psb_gtt_alloc_range(dev, 4 * PAGE_SIZE, "cursor", 1);
		if (!cursor_gt) {
			psb_intel_crtc->cursor_gt = NULL;
			goto out;
		}
		psb_intel_crtc->cursor_gt = cursor_gt;
		psb_intel_crtc->cursor_addr = dev_priv->stolen_base +
							cursor_gt->offset;
	} else {
		psb_intel_crtc->cursor_gt = NULL;
	}

out:
	REG_WRITE(control[psb_intel_crtc->pipe], 0);
	REG_WRITE(base[psb_intel_crtc->pipe], 0);
}

void psb_intel_crtc_init(struct drm_device *dev, int pipe,
		     struct psb_intel_mode_device *mode_dev)
{
	struct drm_psb_private *dev_priv = dev->dev_private;
	struct psb_intel_crtc *psb_intel_crtc;
	int i;
	uint16_t *r_base, *g_base, *b_base;

	/* We allocate a extra array of drm_connector pointers
	 * for fbdev after the crtc */
	psb_intel_crtc =
	    kzalloc(sizeof(struct psb_intel_crtc) +
		    (INTELFB_CONN_LIMIT * sizeof(struct drm_connector *)),
		    GFP_KERNEL);
	if (psb_intel_crtc == NULL)
		return;

	psb_intel_crtc->crtc_state =
		kzalloc(sizeof(struct psb_intel_crtc_state), GFP_KERNEL);
	if (!psb_intel_crtc->crtc_state) {
		dev_err(dev->dev, "Crtc state error: No memory\n");
		kfree(psb_intel_crtc);
		return;
	}

	/* Set the CRTC operations from the chip specific data */
	drm_crtc_init(dev, &psb_intel_crtc->base, dev_priv->ops->crtc_funcs);

	drm_mode_crtc_set_gamma_size(&psb_intel_crtc->base, 256);
	psb_intel_crtc->pipe = pipe;
	psb_intel_crtc->plane = pipe;

	r_base = psb_intel_crtc->base.gamma_store;
	g_base = r_base + 256;
	b_base = g_base + 256;
	for (i = 0; i < 256; i++) {
		psb_intel_crtc->lut_r[i] = i;
		psb_intel_crtc->lut_g[i] = i;
		psb_intel_crtc->lut_b[i] = i;
		r_base[i] = i << 8;
		g_base[i] = i << 8;
		b_base[i] = i << 8;

		psb_intel_crtc->lut_adj[i] = 0;
	}

	psb_intel_crtc->mode_dev = mode_dev;
	psb_intel_crtc->cursor_addr = 0;

	drm_crtc_helper_add(&psb_intel_crtc->base,
						dev_priv->ops->crtc_helper);

	/* Setup the array of drm_connector pointer array */
	psb_intel_crtc->mode_set.crtc = &psb_intel_crtc->base;
	BUG_ON(pipe >= ARRAY_SIZE(dev_priv->plane_to_crtc_mapping) ||
	       dev_priv->plane_to_crtc_mapping[psb_intel_crtc->plane] != NULL);
	dev_priv->plane_to_crtc_mapping[psb_intel_crtc->plane] =
							&psb_intel_crtc->base;
	dev_priv->pipe_to_crtc_mapping[psb_intel_crtc->pipe] =
							&psb_intel_crtc->base;
	psb_intel_crtc->mode_set.connectors =
	    (struct drm_connector **) (psb_intel_crtc + 1);
	psb_intel_crtc->mode_set.num_connectors = 0;
	psb_intel_cursor_init(dev, psb_intel_crtc);

	/* Set to true so that the pipe is forced off on initial config. */
	psb_intel_crtc->active = true;
}

int psb_intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
				struct drm_file *file_priv)
{
	struct drm_psb_private *dev_priv = dev->dev_private;
	struct drm_psb_get_pipe_from_crtc_id_arg *pipe_from_crtc_id = data;
	struct drm_mode_object *drmmode_obj;
	struct psb_intel_crtc *crtc;

	if (!dev_priv) {
		dev_err(dev->dev, "called with no initialization\n");
		return -EINVAL;
	}

	drmmode_obj = drm_mode_object_find(dev, pipe_from_crtc_id->crtc_id,
			DRM_MODE_OBJECT_CRTC);

	if (!drmmode_obj) {
		dev_err(dev->dev, "no such CRTC id\n");
		return -EINVAL;
	}

	crtc = to_psb_intel_crtc(obj_to_crtc(drmmode_obj));
	pipe_from_crtc_id->pipe = crtc->pipe;

	return 0;
}

struct drm_crtc *psb_intel_get_crtc_from_pipe(struct drm_device *dev, int pipe)
{
	struct drm_crtc *crtc = NULL;

	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
		struct psb_intel_crtc *psb_intel_crtc = to_psb_intel_crtc(crtc);
		if (psb_intel_crtc->pipe == pipe)
			break;
	}
	return crtc;
}

int psb_intel_connector_clones(struct drm_device *dev, int type_mask)
{
	int index_mask = 0;
	struct drm_connector *connector;
	int entry = 0;

	list_for_each_entry(connector, &dev->mode_config.connector_list,
			    head) {
		struct psb_intel_encoder *psb_intel_encoder =
					psb_intel_attached_encoder(connector);
		if (type_mask & (1 << psb_intel_encoder->type))
			index_mask |= (1 << entry);
		entry++;
	}
	return index_mask;
}

/* current intel driver doesn't take advantage of encoders
   always give back the encoder for the connector
*/
struct drm_encoder *psb_intel_best_encoder(struct drm_connector *connector)
{
	struct psb_intel_encoder *psb_intel_encoder =
					psb_intel_attached_encoder(connector);

	return &psb_intel_encoder->base;
}

void psb_intel_connector_attach_encoder(struct psb_intel_connector *connector,
					struct psb_intel_encoder *encoder)
{
	connector->encoder = encoder;
	drm_mode_connector_attach_encoder(&connector->base,
					  &encoder->base);
}