drm/i915/sdvo: Fully translate sync flags in the dtd->mode conversion

Instead of just a flag bit for each of the positive/negative sync
modes drm actually uses a separate flag for each ... This upsets the
modeset checker since the adjusted mode filled out at modeset time
doesn't match the one reconstructed at check time (since the
->get_config callback already gets this right).

Reported-by: Knut Petersen <Knut_Petersen@t-online.de>
Cc: Knut Petersen <Knut_Petersen@t-online.de>
References: http://www.gossamer-threads.com/lists/linux/kernel/1778688?do=post_view_threaded
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 85037b9d4934..5033c74966aa 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -866,8 +866,12 @@ static void intel_sdvo_get_mode_from_dtd(struct drm_display_mode * mode,
                 mode->flags |= DRM_MODE_FLAG_INTERLACE;
         if (dtd->part2.dtd_flags & DTD_FLAG_HSYNC_POSITIVE)
                 mode->flags |= DRM_MODE_FLAG_PHSYNC;
+        else
+                mode->flags |= DRM_MODE_FLAG_NHSYNC;
         if (dtd->part2.dtd_flags & DTD_FLAG_VSYNC_POSITIVE)
                 mode->flags |= DRM_MODE_FLAG_PVSYNC;
+        else
+                mode->flags |= DRM_MODE_FLAG_NVSYNC;
 }
 
 static bool intel_sdvo_check_supp_encode(struct intel_sdvo *intel_sdvo)