The patch below does not apply to the 3.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@vger.kernel.org>.
thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 0af78a2bb4296839cfe7a855cd128e8687e77bc1 Mon Sep 17 00:00:00 2001 From: Daniel Vetter <daniel.vet...@ffwll.ch> Date: Wed, 23 May 2012 11:30:55 +0200 Subject: [PATCH] drm/i915: reject doubleclocked cea modes on dp These are ultra-low-res modes used to upscale SDTV content and we don't know how to support these on dp on intel hw: - It's unclear whether we can send avi infoframes over dp ports. - And the pixel repeat setting that work for hdmi/sdvo explicitly don't work for dp. So don't bother and just reject these modes. These modes have been introduced in commit 54ac76f851a1789b047b74a8e14980f2dd1ac749 Author: Christian Schmidt <schm...@digadd.de> Date: Mon Dec 19 14:53:16 2011 +0000 drm/edid: support CEA video modes. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=45729 Tested-by: Yuang Guang <guang.a.y...@intel.com> Cc: stable@vger.kernel.org Reviewed-by: Paulo Zanoni <paulo.r.zan...@intel.com> Tested-by: Paulo Zanoni <paulo.r.zan...@intel.com> Signed-Off-by: Daniel Vetter <daniel.vet...@ffwll.ch> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 3bbd754..eb57ec7 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -266,6 +266,9 @@ intel_dp_mode_valid(struct drm_connector *connector, if (mode->clock < 10000) return MODE_CLOCK_LOW; + if (mode->flags & DRM_MODE_FLAG_DBLCLK) + return MODE_H_ILLEGAL; + return MODE_OK; } @@ -702,6 +705,9 @@ intel_dp_mode_fixup(struct drm_encoder *encoder, struct drm_display_mode *mode, mode->clock = intel_dp->panel_fixed_mode->clock; } + if (mode->flags & DRM_MODE_FLAG_DBLCLK) + return false; + DRM_DEBUG_KMS("DP link computation with max lane count %i " "max bw %02x pixel clock %iKHz\n", max_lane_count, bws[max_clock], mode->clock); -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html