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[6/6] drm/i915: Update intel_dp_check_link_status() for Displayport compliance testing

Message ID 1403647974-42377-7-git-send-email-tprevite@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Todd Previte June 24, 2014, 10:12 p.m. UTC 
Move the DPCD read to the top and check for an interrupt from the sink to catch
Displayport automated testing requests necessary to support Displayport compliance
testing. The checks for active connectors and link status are moved below the
check for the interrupt.

Signed-off-by: Todd Previte <tprevite@gmail.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)
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Patch

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 95bd27a..b58fc25 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3579,22 +3579,9 @@  intel_dp_check_link_status(struct intel_dp *intel_dp)
 	u8 sink_irq_vector;
 	u8 link_status[DP_LINK_STATUS_SIZE];
 
-	/* FIXME: This access isn't protected by any locks. */
-	if (!intel_encoder->connectors_active)
-		return;
-
-	if (WARN_ON(!intel_encoder->base.crtc))
-		return;
-
-	/* Try to read receiver status if the link appears to be up */
-	if (!intel_dp_get_link_status(intel_dp, link_status)) {
-		return;
-	}
-
-	/* Now read the DPCD to see if it's actually running */
-	if (!intel_dp_get_dpcd(intel_dp)) {
+	/* Attempt to read the DPCD */
+	if (!intel_dp_get_dpcd(intel_dp))
 		return;
-	}
 
 	/* Try to read the source of the interrupt */
 	if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
@@ -3604,12 +3591,25 @@  intel_dp_check_link_status(struct intel_dp *intel_dp)
 				   DP_DEVICE_SERVICE_IRQ_VECTOR,
 				   sink_irq_vector);
 
-		if (sink_irq_vector & DP_AUTOMATED_TEST_REQUEST)
+		if (sink_irq_vector & DP_AUTOMATED_TEST_REQUEST) {
+			DRM_DEBUG_KMS("Displayport: Received automated test request\n");
 			intel_dp_handle_test_request(intel_dp);
+		}
 		if (sink_irq_vector & (DP_CP_IRQ | DP_SINK_SPECIFIC_IRQ))
 			DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n");
 	}
 
+	/* FIXME: This access isn't protected by any locks. */
+	if (!intel_encoder->connectors_active)
+		return;
+
+	if (WARN_ON(!intel_encoder->base.crtc))
+		return;
+
+	/* Try to read receiver status if the link appears to be up */
+	if (!intel_dp_get_link_status(intel_dp, link_status))
+		return;
+
 	if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) {
 		DRM_DEBUG_KMS("%s: channel EQ not ok, retraining\n",
 			      intel_encoder->base.name);