From bb10d4ec3be4b069bfb61c60ca4f708f58f440f1 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Tue, 12 Jul 2016 15:00:37 +0300 Subject: [PATCH] drm/i915: Ignore panel type from OpRegion on SKL MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Dell XPS 13 9350 apparently doesn't like it when we use the panel type from OpRegion. The OpRegion panel type (0) tells us to use use low vswing for eDP, whereas the VBT panel type (2) tells us to use normal vswing. The problem is that low vswing results in some display flickers. Since no one seems to know how this stuff is supposed to be handled, let's just ignore the OpRegion panel type on SKL for now. v2: Print the panel type correctly in the debug output Reported-by: James Bottomley Cc: James Bottomley Cc: drm-intel-fixes@lists.freedesktop.org References: https://lists.freedesktop.org/archives/intel-gfx/2016-June/098826.html Fixes: a05628195a0d ("drm/i915: Get panel_type from OpRegion panel details") Signed-off-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/1468324837-29237-1-git-send-email-ville.syrjala@linux.intel.com Reviewed-by: Daniel Vetter Tested-by: James Bottomley Signed-off-by: Ville Syrjälä --- drivers/gpu/drm/i915/intel_opregion.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c index c27d5eb063d0..adca262d591a 100644 --- a/drivers/gpu/drm/i915/intel_opregion.c +++ b/drivers/gpu/drm/i915/intel_opregion.c @@ -1072,5 +1072,16 @@ intel_opregion_get_panel_type(struct drm_i915_private *dev_priv) return -ENODEV; } + /* + * FIXME On Dell XPS 13 9350 the OpRegion panel type (0) gives us + * low vswing for eDP, whereas the VBT panel type (2) gives us normal + * vswing instead. Low vswing results in some display flickers, so + * let's simply ignore the OpRegion panel type on SKL for now. + */ + if (IS_SKYLAKE(dev_priv)) { + DRM_DEBUG_KMS("Ignoring OpRegion panel type (%d)\n", ret - 1); + return -ENODEV; + } + return ret - 1; } -- 2.20.1