For eDP panels all the DPCD and EDID data is cached when initializing
the eDP connector so in futher detection it do not call
intel_dp_detect_dpcd() for eDP.
The problem is on the first short pulse interruption it calls
intel_dp_get_dpcd() for eDP and DP and it will read and set the sink
count, causing a mismatch between old sink count and the new one
triggering a full detection without needed.
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
Signed-off-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 19f0c3f59cbe..4a1c31ec9065 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3926,6 +3926,7 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv =
to_i915(dp_to_dig_port(intel_dp)->base.base.dev);
+ u8 val;
/* this function is meant to be called only once */
WARN_ON(intel_dp->dpcd[DP_DPCD_REV] != 0);
@@ -3997,6 +3998,10 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp)
intel_dp_set_common_rates(intel_dp);
+ if (drm_dp_dpcd_readb(&intel_dp->aux, DP_SINK_COUNT, &val) <= 0)
+ return false;
+ intel_dp->sink_count = DP_GET_SINK_COUNT(val);
+
return true;
}
--
2.19.0
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