According to chapter 5.1.1.2 in DP spec. When the Sink
device capability is unknown, for example due to corruption
of an EDID. The Source device may fall back to a set of
fall-back video timing formats its choice. When none of
the fall-back video timing formats is acceptable, the
Source device must fall back to the fail safe mode,
which is 640 x 480 at 60Hz.
This change set source driver output fail-safe mode automatically
if EDID corrupt. It may also benefit link layer compliance
test case "4.2.2.6 EDID Corruption Detection".
Cc: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Cooper Chiou <cooper.chiou@xxxxxxxxx>
Signed-off-by: Lee Shawn C <shawn.c.lee@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index c27d3e7ac219..7e072db4a530 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -5659,9 +5659,18 @@ intel_dp_get_edid(struct intel_dp *intel_dp)
return NULL;
return drm_edid_duplicate(intel_connector->edid);
- } else
- return drm_get_edid(&intel_connector->base,
+ } else {
+ struct edid *edid;
+
+ edid = drm_get_edid(&intel_connector->base,
&intel_dp->aux.ddc);
+
+ if (intel_connector->base.edid_corrupt || !edid)
+ if (drm_add_modes_noedid(&intel_connector->base, 640, 480))
+ drm_set_preferred_mode(&intel_connector->base, 640, 480);
+
+ return edid;
+ }
}
static void
--
2.17.1
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