[Intel-gfx] [PATCH 1/5] drm/i915: Move Displayport test request and sink IRQ logic to intel_dp_detect()

[Todd Previte]

Due to changes in the driver and to support Displayport compliance testing,
the test request and sink IRQ logic has been relocated from
intel_dp_check_link_status to intel_dp_detect. The reason for this is that
this handler should be called during the normal hot plug path for a long
pulse / hot plug event only. The intel_dp_check_link_status function is
called for short pulses from intel_dp_hpd_pulse().

This allows for the proper detection of Displayport compliance test requests
and the invocation of the test handler to support them. Additionally, this
places compliance testing in the normal operational paths, eliminating as
much special case code as possible.

Signed-off-by: Todd Previte <tprevite at gmail.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 29 ++++++++++++++---------------
 1 file changed, 14 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 2ef05d7..55d1f5f 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4123,7 +4123,6 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
 {
 	struct drm_device *dev = intel_dp_to_dev(intel_dp);
 	struct intel_encoder *intel_encoder = &dp_to_dig_port(intel_dp)->base;
-	u8 sink_irq_vector;
 	u8 link_status[DP_LINK_STATUS_SIZE];
 
 	WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
@@ -4147,20 +4146,6 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
 		return;
 	}
 
-	/* Try to read the source of the interrupt */
-	if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
-	    intel_dp_get_sink_irq(intel_dp, &sink_irq_vector)) {
-		/* Clear interrupt source */
-		drm_dp_dpcd_writeb(&intel_dp->aux,
-				   DP_DEVICE_SERVICE_IRQ_VECTOR,
-				   sink_irq_vector);
-
-		if (sink_irq_vector & DP_AUTOMATED_TEST_REQUEST)
-			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");
-	}
-
 	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);
@@ -4386,6 +4371,7 @@ intel_dp_detect(struct drm_connector *connector, bool force)
 	enum drm_connector_status status;
 	enum intel_display_power_domain power_domain;
 	bool ret;
+	u8 sink_irq_vector;
 
 	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 		      connector->base.id, connector->name);
@@ -4428,6 +4414,19 @@ intel_dp_detect(struct drm_connector *connector, bool force)
 		intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
 	status = connector_status_connected;
 
+	/* Check for sink IRQ and determine cause */
+	if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
+	    intel_dp_get_sink_irq(intel_dp, &sink_irq_vector)) {
+		/* Clear interrupt source */
+		drm_dp_dpcd_writeb(&intel_dp->aux,
+				   DP_DEVICE_SERVICE_IRQ_VECTOR,
+				   sink_irq_vector);
+		if (sink_irq_vector & DP_AUTOMATED_TEST_REQUEST)
+			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");
+	}
+
 out:
 	intel_dp_power_put(intel_dp, power_domain);
 	return status;
-- 
1.9.1