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drm/i915: Factor in pixel-repeat in FDI M/N calculation

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Fixes the modesetting on the secondary panel of the Libretto W100 and
presumably many more Ironlake laptops with SDVO LVDS displays.

Reported-and-tested-by: Matthew Willoughby <mattfredwill@gmail.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
This commit is contained in:
Chris Wilson 2010-12-04 07:45:57 +00:00
parent 22ed1113a9
commit 49078f7d10
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_display.c
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@ -3710,6 +3710,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
/* FDI link */
if (HAS_PCH_SPLIT(dev)) {
int pixel_multiplier = intel_mode_get_pixel_multiplier(adjusted_mode);
int lane = 0, link_bw, bpp;
/* CPU eDP doesn't require FDI link, so just set DP M/N
according to current link config */
@ -3793,6 +3794,8 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
intel_crtc->fdi_lanes = lane;
if (pixel_multiplier > 1)
link_bw *= pixel_multiplier;
ironlake_compute_m_n(bpp, lane, target_clock, link_bw, &m_n);
}