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 <[email protected]> Cc: Ville Syrjälä <[email protected]> Cc: Jani Nikula <[email protected]> Cc: Cooper Chiou <[email protected]> Signed-off-by: Lee Shawn C <[email protected]> --- 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 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
