[PATCH v3 07/20] drm/i915/dp: Don't clobber the encoder state in the HPD IRQ handler

[Imre Deak <imre.deak@intel.com>]

The intel_dp_get_dpcd() function called from an HPD IRQ handler reads
out the DPRX capabilities from the sink and updates these in the
intel_dp encoder state. Since the IRQ handler can run in parallel with
the encoder/connector detection (intel_dp_detect()) which also calls
intel_dp_get_dpcd(), the encoder state can get corrupted, since the two
updates happen in a racy way.

Fix the above by checking only for any change in the sink count value in
the HPD IRQ handler, without updating the encoder state.

Note that any state change in the sink requiring an update of the
encoder state is handled via the sink's SINK_COUNT change,
RX_CAPS_CHANGED, DOWNSTREAM_PORT_STATUS_CHANGED signaling, which all
should result in a full connector detection.

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index f7f02ce5d1a77..acef106b041ea 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -5843,9 +5843,7 @@ static bool intel_dp_check_link_service_irq(struct intel_dp *intel_dp)
 static bool
 intel_dp_short_pulse(struct intel_dp *intel_dp)
 {
-	u8 old_sink_count = intel_dp->sink_count;
 	bool reprobe_needed = false;
-	bool ret;
 
 	intel_dp_test_reset(intel_dp);
 
@@ -5855,12 +5853,10 @@ intel_dp_short_pulse(struct intel_dp *intel_dp)
 	 * the value that was stored earlier or dpcd read failed
 	 * we need to do full detection
 	 */
-	ret = intel_dp_get_dpcd(intel_dp);
-
-	if ((old_sink_count != intel_dp->sink_count) || !ret) {
+	if (intel_dp_has_sink_count(intel_dp) &&
+	    drm_dp_read_sink_count(&intel_dp->aux) != intel_dp->sink_count)
 		/* No need to proceed if we are going to do full detect */
 		return false;
-	}
 
 	intel_dp_check_device_service_irq(intel_dp);
 	reprobe_needed = intel_dp_check_link_service_irq(intel_dp);
-- 
2.49.1