[PATCH 0/2] Enforcing link training as per compliance test requirement

[PATCH 0/2] Enforcing link training as per compliance test requirement

[Shubhangi Shrivastava]

This patchset performs link training whenever it is requested by Panel
as stated in compliance test requirement. This requires clearing the
automated test data during every short pulse or long pulse instead of
clearing it only during the automated requests.

Shubhangi Shrivastava (2):
  drm/i915: Cleanup test data during long/short hotplug
  drm/i915: force link training when requested by Sink

 drivers/gpu/drm/i915/intel_dp.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

-- 
2.6.1

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

[Shubhangi Shrivastava]

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@intel.com>
Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava@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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[PATCH 2/2] drm/i915: force link training when requested by Sink

[Shubhangi Shrivastava]

Compliance test 4.3.1.11 requires source to perform link training
always if the automated test requests for it. This patch
enforces this requirement.

Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 7bc75ef..3c7fc58 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4466,7 +4466,9 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
 			DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n");
 	}
 
-	if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) {
+	/* if link training is requested we should perform it always */
+	if ((intel_dp->compliance_test_type == DP_TEST_LINK_TRAINING) ||
+		(!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);
 		intel_dp_start_link_train(intel_dp);
-- 
2.6.1

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Re: [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@lists.freedesktop.org] On Behalf Of Shubhangi Shrivastava
Sent: Wednesday, October 14, 2015 2:57 PM
To: intel-gfx@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@intel.com>
Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava@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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[PATCH] drm/i915: Cleanup test data during long/short hotplug

[Shubhangi Shrivastava]

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.

v2: Added comments and moved nack and defer variables before set_edid
(Sonika)

Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 18bcfbe..99b8d8c 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 +4432,14 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
 
 	WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 
+	/*
+	 * Clearing compliance test variables to allow capturing
+	 * of values for next automated test request.
+	 */
+	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 +4818,13 @@ 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;
+
 		goto out;
+	}
 
 	intel_dp_probe_oui(intel_dp);
 
@@ -4832,6 +4838,14 @@ intel_dp_detect(struct drm_connector *connector, bool force)
 		goto out;
 	}
 
+	/*
+	 * Clearing NACK and defer counts to get their exact values
+	 * while reading EDID which are required by Compliance tests
+	 * 4.2.2.4 and 4.2.2.5
+	 */
+	intel_dp->aux.i2c_nack_count = 0;
+	intel_dp->aux.i2c_defer_count = 0;
+
 	intel_dp_set_edid(intel_dp);
 
 	if (intel_encoder->type != INTEL_OUTPUT_EDP)
-- 
2.6.1

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Re: [PATCH] drm/i915: Cleanup test data during long/short hotplug

[Jindal, Sonika]

Looks good to me.
Reviewed-by: Sonika Jindal <sonika.jindal@intel.com

-----Original Message-----
From: Intel-gfx [mailto:intel-gfx-bounces@lists.freedesktop.org] On Behalf Of Shubhangi Shrivastava
Sent: Wednesday, October 28, 2015 3:31 PM
To: intel-gfx@lists.freedesktop.org
Cc: Shrivastava, Shubhangi
Subject: [Intel-gfx] [PATCH] 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.

v2: Added comments and moved nack and defer variables before set_edid
(Sonika)

Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 18bcfbe..99b8d8c 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 +4432,14 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
 
 	WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
 
+	/*
+	 * Clearing compliance test variables to allow capturing
+	 * of values for next automated test request.
+	 */
+	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 +4818,13 @@ 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;
+
 		goto out;
+	}
 
 	intel_dp_probe_oui(intel_dp);
 
@@ -4832,6 +4838,14 @@ intel_dp_detect(struct drm_connector *connector, bool force)
 		goto out;
 	}
 
+	/*
+	 * Clearing NACK and defer counts to get their exact values
+	 * while reading EDID which are required by Compliance tests
+	 * 4.2.2.4 and 4.2.2.5
+	 */
+	intel_dp->aux.i2c_nack_count = 0;
+	intel_dp->aux.i2c_defer_count = 0;
+
 	intel_dp_set_edid(intel_dp);
 
 	if (intel_encoder->type != INTEL_OUTPUT_EDP)
--
2.6.1

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Re: [PATCH 2/2] drm/i915: force link training when requested by Sink

[Jindal, Sonika]

Looks good to me.
Reviewed-by: Sonika Jindal <sonika.jindal@intel.com

-----Original Message-----
From: Intel-gfx [mailto:intel-gfx-bounces@lists.freedesktop.org] On Behalf Of Shubhangi Shrivastava
Sent: Wednesday, October 14, 2015 2:57 PM
To: intel-gfx@lists.freedesktop.org
Cc: Shrivastava, Shubhangi
Subject: [Intel-gfx] [PATCH 2/2] drm/i915: force link training when requested by Sink

Compliance test 4.3.1.11 requires source to perform link training always if the automated test requests for it. This patch enforces this requirement.

Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 7bc75ef..3c7fc58 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4466,7 +4466,9 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
 			DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n");
 	}
 
-	if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) {
+	/* if link training is requested we should perform it always */
+	if ((intel_dp->compliance_test_type == DP_TEST_LINK_TRAINING) ||
+		(!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);
 		intel_dp_start_link_train(intel_dp);
--
2.6.1

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Re: [PATCH 2/2] drm/i915: force link training when requested by Sink

[Shrivastava, Shubhangi]

Hi Daniel,

Is something else required for this patch series (2 patches) to be merged?

Thanks and Regards,
Shubhangi Shrivastava.

-----Original Message-----
From: Jindal, Sonika 
Sent: Thursday, November 5, 2015 10:36 AM
To: Shrivastava, Shubhangi <shubhangi.shrivastava@intel.com>; intel-gfx@lists.freedesktop.org
Cc: Shrivastava, Shubhangi <shubhangi.shrivastava@intel.com>
Subject: RE: [Intel-gfx] [PATCH 2/2] drm/i915: force link training when requested by Sink

Looks good to me.
Reviewed-by: Sonika Jindal <sonika.jindal@intel.com

-----Original Message-----
From: Intel-gfx [mailto:intel-gfx-bounces@lists.freedesktop.org] On Behalf Of Shubhangi Shrivastava
Sent: Wednesday, October 14, 2015 2:57 PM
To: intel-gfx@lists.freedesktop.org
Cc: Shrivastava, Shubhangi
Subject: [Intel-gfx] [PATCH 2/2] drm/i915: force link training when requested by Sink

Compliance test 4.3.1.11 requires source to perform link training always if the automated test requests for it. This patch enforces this requirement.

Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 7bc75ef..3c7fc58 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4466,7 +4466,9 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
 			DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n");
 	}
 
-	if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) {
+	/* if link training is requested we should perform it always */
+	if ((intel_dp->compliance_test_type == DP_TEST_LINK_TRAINING) ||
+		(!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);
 		intel_dp_start_link_train(intel_dp);
--
2.6.1

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Re: [PATCH 2/2] drm/i915: force link training when requested by Sink

[Daniel Vetter]

On Tue, Nov 17, 2015 at 09:12:58AM +0000, Shrivastava, Shubhangi wrote:
> Hi Daniel,
> 
> Is something else required for this patch series (2 patches) to be merged?

Me coming back from vacation ;-) Both patches applied to dinq.

Aside: The test request tracking seems a bit too much ad-hoc. But I guess
we can only clean that up once the entire hpd handling mess is sorted out.
-Daniel

> 
> Thanks and Regards,
> Shubhangi Shrivastava.
> 
> -----Original Message-----
> From: Jindal, Sonika 
> Sent: Thursday, November 5, 2015 10:36 AM
> To: Shrivastava, Shubhangi <shubhangi.shrivastava@intel.com>; intel-gfx@lists.freedesktop.org
> Cc: Shrivastava, Shubhangi <shubhangi.shrivastava@intel.com>
> Subject: RE: [Intel-gfx] [PATCH 2/2] drm/i915: force link training when requested by Sink
> 
> Looks good to me.
> Reviewed-by: Sonika Jindal <sonika.jindal@intel.com
> 
> -----Original Message-----
> From: Intel-gfx [mailto:intel-gfx-bounces@lists.freedesktop.org] On Behalf Of Shubhangi Shrivastava
> Sent: Wednesday, October 14, 2015 2:57 PM
> To: intel-gfx@lists.freedesktop.org
> Cc: Shrivastava, Shubhangi
> Subject: [Intel-gfx] [PATCH 2/2] drm/i915: force link training when requested by Sink
> 
> Compliance test 4.3.1.11 requires source to perform link training always if the automated test requests for it. This patch enforces this requirement.
> 
> Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
> Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 7bc75ef..3c7fc58 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -4466,7 +4466,9 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
>  			DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n");
>  	}
>  
> -	if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) {
> +	/* if link training is requested we should perform it always */
> +	if ((intel_dp->compliance_test_type == DP_TEST_LINK_TRAINING) ||
> +		(!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);
>  		intel_dp_start_link_train(intel_dp);
> --
> 2.6.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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