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drm/i915: fix FDI frequency check 

Since mode->clock is in kHz we should be checking against 2700000
instead of just 27000.  This patch gets my x201s working again (well
working as well as it ever was anyway).

When looking for this I also noticed we set link_bw to 270000, but the
calculation is different.  Does it also need to use kHz or we using
10kHz internally?

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Jesse Barnes 2010-07-07 14:06:43 -07:00 committed by Eric Anholt
parent 3ca87e8283
commit 2377b741ab
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/i915/intel_display.c
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@ -323,6 +323,9 @@ struct intel_limit {
#define IRONLAKE_DP_P1_MIN 1
#define IRONLAKE_DP_P1_MAX 2
/* FDI */
#define IRONLAKE_FDI_FREQ 2700000 /* in kHz for mode->clock */
static bool
intel_find_best_PLL(const intel_limit_t *limit, struct drm_crtc *crtc,
int target, int refclk, intel_clock_t *best_clock);
@ -2421,8 +2424,8 @@ static bool intel_crtc_mode_fixup(struct drm_crtc *crtc,
struct drm_device *dev = crtc->dev;
if (HAS_PCH_SPLIT(dev)) {
/* FDI link clock is fixed at 2.7G */
if (mode->clock * 3 > 27000 * 4)
return MODE_CLOCK_HIGH;
if (mode->clock * 3 > IRONLAKE_FDI_FREQ * 4)
return false;
}
drm_mode_set_crtcinfo(adjusted_mode, 0);