[PATCH 2/2] drm/i915: Skip SINK_COUNT read on CH7511

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

CH7511 doesn't update SINK_COUNT properly so in order to detect
the device as connected we have to ignore SINK_COUNT.

In order to have access to the quirk list early enough we
must move the drm_dp_read_desc() call to happen earlier.
We can also skip re-reading this on eDP since we know it
won't change.

Cc: David S. <david@majinbuu.com>
Cc: Peteris Rudzusiks <peteris.rudzusiks@gmail.com>
Tested-by: Peteris Rudzusiks <peteris.rudzusiks@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105406
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 24b56b2a76c8..8fe6571cda8f 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4242,8 +4242,14 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
 	if (!intel_dp_read_dpcd(intel_dp))
 		return false;
 
-	/* Don't clobber cached eDP rates. */
+	/*
+	 * Don't clobber cached eDP rates. Also skip re-reading
+	 * the OUI/ID since we know it won't change.
+	 */
 	if (!intel_dp_is_edp(intel_dp)) {
+		drm_dp_read_desc(&intel_dp->aux, &intel_dp->desc,
+				 drm_dp_is_branch(intel_dp->dpcd));
+
 		intel_dp_set_sink_rates(intel_dp);
 		intel_dp_set_common_rates(intel_dp);
 	}
@@ -4252,7 +4258,8 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
 	 * Some eDP panels do not set a valid value for sink count, that is why
 	 * it don't care about read it here and in intel_edp_init_dpcd().
 	 */
-	if (!intel_dp_is_edp(intel_dp)) {
+	if (!intel_dp_is_edp(intel_dp) &&
+	    !drm_dp_has_quirk(&intel_dp->desc, DP_DPCD_QUIRK_NO_SINK_COUNT)) {
 		u8 count;
 		ssize_t r;
 
@@ -5586,9 +5593,6 @@ intel_dp_detect(struct drm_connector *connector,
 	if (INTEL_GEN(dev_priv) >= 11)
 		intel_dp_get_dsc_sink_cap(intel_dp);
 
-	drm_dp_read_desc(&intel_dp->aux, &intel_dp->desc,
-			 drm_dp_is_branch(intel_dp->dpcd));
-
 	intel_dp_configure_mst(intel_dp);
 
 	if (intel_dp->is_mst) {
-- 
2.21.0

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