drm/i915: Fixing eDP detection on certain platforms
Since commit 30d9aa4265fe ("drm/i915: Read sink_count dpcd always"),
the status of a DP connector depends on its sink count value.
However, some eDP panels don't set that value appropriately,
causing them to be reported as disconnected.
Fix this by ignoring sink count for eDP.
v2: Rephrased commit message. (Ander)
In case of eDP, returning status as connected if DPCD
read succeeds to avoid any further operations.
Fixes: 30d9aa4265fe ("drm/i915: Read sink_count dpcd always")
Cc: Ander Conselvan De Oliveira <conselvan2@gmail.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Reported-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava@intel.com>
Tested-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1460444034-22320-1-git-send-email-shubhangi.shrivastava@intel.com
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 60372f8..a3fc494 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3776,7 +3776,7 @@
* downstream port information. So, an early return here saves
* time from performing other operations which are not required.
*/
- if (!intel_dp->sink_count)
+ if (!is_edp(intel_dp) && !intel_dp->sink_count)
return false;
/* Check if the panel supports PSR */
@@ -4309,6 +4309,9 @@
if (!intel_dp_get_dpcd(intel_dp))
return connector_status_disconnected;
+ if (is_edp(intel_dp))
+ return connector_status_connected;
+
/* if there's no downstream port, we're done */
if (!(dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT))
return connector_status_connected;