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Commit 49078f7d authored by Chris Wilson's avatar Chris Wilson
Browse files

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



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: default avatarMatthew Willoughby <mattfredwill@gmail.com>
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
parent 22ed1113

drivers/gpu/drm/i915/intel_display.c

+3 −0
Original line number Diff line number Diff line
@@ -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);

	}