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.
v2: Don't detect the DP++ limits when we're testing using overridden
EDIDs. Make sure to check for the override condition after
respecting the value of drm_dp_dual_mode_detect (Jani Nikula).
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101649
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_hdmi.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index bced7b9..9834690 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1567,7 +1567,10 @@ intel_hdmi_dp_dual_mode_detect(struct drm_connector *connector, bool has_edid)
* there's nothing connected to the port.
*/
if (type == DRM_DP_DUAL_MODE_UNKNOWN) {
- if (has_edid &&
+ /* An overridden EDID imply that we want this port for testing.
+ * Make sure not to set limits for that port.
+ */
+ if (has_edid && !connector->override_edid &&
intel_bios_is_port_dp_dual_mode(dev_priv, port)) {
DRM_DEBUG_KMS("Assuming DP dual mode adaptor presence based on VBT\n");
type = DRM_DP_DUAL_MODE_TYPE1_DVI;
--
2.7.4
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