[Intel-gfx] [PATCH 1/2] drm/i915: Cleanup test data during long/short hotplug

[Jindal, Sonika]

For the edid read test, if we are capturing i2c_nack_count and i2c_defer_count, it will be better if you move the resetting of these variable just before the edid read.
Also, please add some comment why we need to reset compliance_test_* at two places.

Regards,
Sonika

-----Original Message-----
From: Intel-gfx [mailto:intel-gfx-bounces at lists.freedesktop.org] On Behalf Of Shubhangi Shrivastava
Sent: Wednesday, October 14, 2015 2:57 PM
To: intel-gfx at lists.freedesktop.org
Cc: Shrivastava, Shubhangi
Subject: [Intel-gfx] [PATCH 1/2] drm/i915: Cleanup test data during long/short hotplug

Automated test data that is updated when a test is requested is not cleared till next automated test request is recevied which can cause various problems. This patch fixes this by clearing this during the next short pulse and on hot unplug.

For example, when TEST_LINK_TRAINING is requested it is updated to appropriate variable inside intel_dp_handle_test_request but is also cleared only inside the same function. if the next short pulse does not have the AUTOMATED_TEST_REQUEST bits set the variable will not be cleared resulting in carrying incorrect test status in local variables.

Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani at intel.com>
Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava at intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 18bcfbe..7bc75ef 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4317,13 +4317,6 @@ static void intel_dp_handle_test_request(struct intel_dp *intel_dp)
 	uint8_t rxdata = 0;
 	int status = 0;
 
-	intel_dp->compliance_test_active = 0;
-	intel_dp->compliance_test_type = 0;
-	intel_dp->compliance_test_data = 0;
-
-	intel_dp->aux.i2c_nack_count = 0;
-	intel_dp->aux.i2c_defer_count = 0;
-
 	status = drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_REQUEST, &rxdata, 1);
 	if (status <= 0) {
 		DRM_DEBUG_KMS("Could not read test request from sink\n"); @@ -4439,6 +4432,10 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
 
 	WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 
+	intel_dp->compliance_test_active = 0;
+	intel_dp->compliance_test_type = 0;
+	intel_dp->compliance_test_data = 0;
+
 	if (!intel_encoder->base.crtc)
 		return;
 
@@ -4817,8 +4814,16 @@ intel_dp_detect(struct drm_connector *connector, bool force)
 		status = ironlake_dp_detect(intel_dp);
 	else
 		status = g4x_dp_detect(intel_dp);
-	if (status != connector_status_connected)
+	if (status != connector_status_connected) {
+		intel_dp->compliance_test_active = 0;
+		intel_dp->compliance_test_type = 0;
+		intel_dp->compliance_test_data = 0;
+
+		intel_dp->aux.i2c_nack_count = 0;
+		intel_dp->aux.i2c_defer_count = 0;
+
 		goto out;
+	}
 
 	intel_dp_probe_oui(intel_dp);
 
--
2.6.1

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