/*
 * 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 = 0, 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");
                ret = -ENOMEM;
                goto unref_cursor;
        }

        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);
                goto unref_cursor;
        }

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

                /* 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 ret;

unref_cursor:
        drm_gem_object_unreference(obj);
        return ret;
}

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);
}

static void psb_intel_crtc_disable(struct drm_crtc *crtc)
{
        struct gtt_range *gt;
        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;

        crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);

        if (crtc->fb) {
                gt = to_psb_fb(crtc->fb)->gtt;
                psb_gtt_unpin(gt);
        }
}

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,
        .disable = psb_intel_crtc_disable,
};

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);
}