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drm/i915: Skip SINK_COUNT read on CH7511

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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>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528140650.19230-2-ville.syrjala@linux.intel.com
Acked-by: Jani Nikula <jani.nikula@intel.com> #irc
This commit is contained in:
Ville Syrjälä 2019-05-28 17:06:50 +03:00
parent f774f09649
commit eaa2b31be1
1 changed files with 9 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/gpu/drm/i915/display/intel_dp.c
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@ -4221,8 +4221,14 @@ 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);
}
@ -4231,7 +4237,8 @@ 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;
@ -5377,9 +5384,6 @@ 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) {