[Intel-gfx] [PATCH] drm/i915: Ignore TMDS clock limit for DP++ when EDID override is set

[Abdiel Janulgue]

4K modes testing by using dummy EDID data has never been working
properly on boxes with DP++ (dual-mode) adaptors. The reason for
this is that  those modes got pruned during hdmi mode validation.
intel_hdmi_mode_valid returns CLOCK_HIGH  because the pixel clock
reported by the 4k mode is higher than dual port TMDS clock limit.

However 4k injection does work properly on machines that don't have
DP++ adapters because the mode is never validated against the DP++
TMDS clock limit.

Ignore the limits when we're testing using overriden EDIDs.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101649
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_hdmi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index bced7b9..d133353 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1576,7 +1576,7 @@ intel_hdmi_dp_dual_mode_detect(struct drm_connector *connector, bool has_edid)
 		}
 	}
 
-	if (type == DRM_DP_DUAL_MODE_NONE)
+	if (type == DRM_DP_DUAL_MODE_NONE || connector->override_edid)
 		return;
 
 	hdmi->dp_dual_mode.type = type;
-- 
2.7.4