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* [PATCH] drm/i915: Fixing eDP detection on certain platforms
@ 2016-04-12  6:53 Shubhangi Shrivastava
  2016-04-12  7:09 ` Ander Conselvan De Oliveira
  2016-04-12  8:16 ` ✗ Fi.CI.BAT: failure for drm/i915: Fixing eDP detection on certain platforms (rev4) Patchwork
  0 siblings, 2 replies; 4+ messages in thread
From: Shubhangi Shrivastava @ 2016-04-12  6:53 UTC (permalink / raw)
  To: intel-gfx; +Cc: Shubhangi Shrivastava

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>
---
 drivers/gpu/drm/i915/intel_dp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index da0c3d2..bdc7e12 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3806,7 +3806,7 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
 	 * 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 */
@@ -4339,6 +4339,9 @@ intel_dp_detect_dpcd(struct intel_dp *intel_dp)
 	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;
-- 
2.6.1

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^ permalink raw reply related	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2016-04-13  9:13 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-04-12  6:53 [PATCH] drm/i915: Fixing eDP detection on certain platforms Shubhangi Shrivastava
2016-04-12  7:09 ` Ander Conselvan De Oliveira
2016-04-12  8:16 ` ✗ Fi.CI.BAT: failure for drm/i915: Fixing eDP detection on certain platforms (rev4) Patchwork
2016-04-13  9:13   ` Tvrtko Ursulin

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