Re: [PATCH 01/10] drm/i915: Add automated testing support for Displayport compliance testing

[Daniel Vetter <daniel@ffwll.ch>]

On Thu, Oct 09, 2014 at 08:38:01AM -0700, Todd Previte wrote:
> Add the skeleton framework for supporting automation for Displayport compliance
> testing. This patch adds the necessary framework for the source device to appropriately
> respond to test automation requests from a sink device.
> 
> Signed-off-by: Todd Previte <tprevite@gmail.com>

Patch is missing the patch changelog here which details your changes
compared to the earlier version. This is especially important since Paulo
has already started reviewing your patches, so it's good practice to
mention all the things you've changed. And much more important, which
parts you didn't change - that _must_ happen, eithere in the commit
message or with a reply to Paulo's review. Also, please cc any people who
previously commented on a patch so that they have a chance to catch the
next round.

Without all that review iterations are a massive pain for reviewers since
they might miss you resends and have to re-read all the patches again
completely to check that you didn't miss anything.

Thanks, Daniel
> ---
>  drivers/gpu/drm/i915/intel_dp.c | 82 ++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 80 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 64c8e04..f7d4119 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3959,11 +3959,89 @@ intel_dp_get_sink_irq_esi(struct intel_dp *intel_dp, u8 *sink_irq_vector)
>  	return true;
>  }
>  
> +/* Displayport compliance testing - Link training */
> +static uint8_t
> +intel_dp_autotest_link_training(struct intel_dp *intel_dp)
> +{
> +	uint8_t test_result = DP_TEST_NAK;
> +	return test_result;
> +}
> +
> +/* Displayport compliance testing - Video pattern testing */
> +static uint8_t
> +intel_dp_autotest_video_pattern(struct intel_dp *intel_dp)
> +{
> +	uint8_t test_result = DP_TEST_NAK;
> +	return test_result;
> +}
> +
> +/* Displayport compliance testing - EDID operations */
> +static uint8_t
> +intel_dp_autotest_edid(struct intel_dp *intel_dp)
> +{
> +	uint8_t test_result = DP_TEST_NAK;
> +	return test_result;
> +}
> +
> +/* Displayport compliance testing - PHY pattern testing */
> +static uint8_t
> +intel_dp_autotest_phy_pattern(struct intel_dp *intel_dp)
> +{
> +	uint8_t test_result = DP_TEST_NAK;
> +	return test_result;
> +}
> +
>  static void
>  intel_dp_handle_test_request(struct intel_dp *intel_dp)
>  {
> -	/* NAK by default */
> -	drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_RESPONSE, DP_TEST_NAK);
> +	uint8_t response = DP_TEST_NAK;
> +	uint8_t rxdata = 0;
> +	int status = 0;
> +
> +	DRM_DEBUG_KMS("Received automated test request\n");
> +	status = drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_REQUEST, &rxdata, 1);
> +
> +	/* ACK/NAK response based on test function response
> +	   Unimplemented/unsupported tests will NAK by default */
> +	switch (rxdata) {
> +	case DP_TEST_LINK_TRAINING:
> +		DRM_DEBUG_KMS("Executing LINK_TRAINING request\n");
> +		intel_dp->compliance_test_data = DP_TEST_LINK_TRAINING;
> +		response = intel_dp_autotest_link_training(intel_dp);
> +		break;
> +	case DP_TEST_LINK_VIDEO_PATTERN:
> +		DRM_DEBUG_KMS("Executing TEST_PATTERN request\n");
> +		intel_dp->compliance_test_data = DP_TEST_LINK_VIDEO_PATTERN;
> +		response = intel_dp_autotest_video_pattern(intel_dp);
> +		break;
> +	case DP_TEST_LINK_EDID_READ:
> +		DRM_DEBUG_KMS("Executing EDID request\n");
> +		intel_dp->compliance_test_data = DP_TEST_LINK_EDID_READ;
> +		response = intel_dp_autotest_edid(intel_dp);
> +		break;
> +	case DP_TEST_LINK_PHY_TEST_PATTERN:
> +		DRM_DEBUG_KMS("Executing PHY_PATTERN request\n");
> +		intel_dp->compliance_test_data = DP_TEST_LINK_PHY_TEST_PATTERN;
> +		response = intel_dp_autotest_phy_pattern(intel_dp);
> +		break;
> +		/* FAUX is optional in DP 1.2*/
> +	case DP_TEST_LINK_FAUX_PATTERN:
> +		DRM_DEBUG_KMS("FAUX_PATTERN testing not supported\n");
> +		break;
> +	/* Unsupported test case or something went wrong */
> +	default:
> +		DRM_DEBUG_KMS("Unhandled test request\n");
> +		break;
> +	}
> +	if (status != 0) {
> +		response = DP_TEST_NAK;
> +		DRM_DEBUG_KMS("Error %d processing test request\n", status);
> +	}
> +	status = drm_dp_dpcd_write(&intel_dp->aux,
> +				   DP_TEST_RESPONSE,
> +				   &response, 1);
> +	intel_dp->compliance_testing_active = 0;
> +
>  }
>  
>  static int
> -- 
> 1.9.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch