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

[Daniel Vetter]

On Wed, Apr 15, 2015 at 08:38:38AM -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.
> 
> V2:
> - Addressed previous mailing list feedback
> - Fixed compilation issue (struct members declared in a later patch)
> - Updated debug messages to be more accurate
> - Added status checks for the DPCD read/write calls
> - Removed excess comments and debug messages
> - Fixed debug message compilation warnings
> - Fixed compilation issue with missing variables
> - Updated link training autotest to ACK
> 
> V3:
> - Fixed the checks on the DPCD return code to be <= 0
>   rather than != 0
> - Removed extraneous assignment of a NAK return code in the
>   DPCD read failure case
> - Changed the return in the DPCD read failure case to a goto
>   to the exit point where the status code is written to the sink
> - Removed FAUX test case since it's deprecated now
> - Removed the compliance flag assignment in handle_test_request
> 
> V4:
> - Moved declaration of type_type here
> - Removed declaration of test_data (moved to a later patch)
> - Added reset to 0 for compliance test variables
> 
> V5:
> - Moved test_active variable declaration and initialization out of
>   this patch and into the patch where it's used
> - Changed variable name compliance_testing_active to
>   compliance_test_active to unify the naming convention
> - Added initialization for compliance_test_type variable
> 
> Signed-off-by: Todd Previte <tprevite at gmail.com>
> Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>

Queued for -next, thanks for the patch.
-Daniel

> ---
>  drivers/gpu/drm/i915/intel_dp.c  | 75 +++++++++++++++++++++++++++++++++++++---
>  drivers/gpu/drm/i915/intel_drv.h |  3 ++
>  2 files changed, 74 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 14cdd00..263eff3 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3970,11 +3970,78 @@ intel_dp_get_sink_irq_esi(struct intel_dp *intel_dp, u8 *sink_irq_vector)
>  	return true;
>  }
>  
> -static void
> -intel_dp_handle_test_request(struct intel_dp *intel_dp)
> +static uint8_t intel_dp_autotest_link_training(struct intel_dp *intel_dp)
> +{
> +	uint8_t test_result = DP_TEST_ACK;
> +	return test_result;
> +}
> +
> +static uint8_t intel_dp_autotest_video_pattern(struct intel_dp *intel_dp)
> +{
> +	uint8_t test_result = DP_TEST_NAK;
> +	return test_result;
> +}
> +
> +static uint8_t intel_dp_autotest_edid(struct intel_dp *intel_dp)
> +{
> +	uint8_t test_result = DP_TEST_NAK;
> +	return test_result;
> +}
> +
> +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;
> +
> +	intel_dp->compliance_test_type = 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");
> +		goto update_status;
> +	}
> +
> +	switch (rxdata) {
> +	case DP_TEST_LINK_TRAINING:
> +		DRM_DEBUG_KMS("LINK_TRAINING test requested\n");
> +		intel_dp->compliance_test_type = DP_TEST_LINK_TRAINING;
> +		response = intel_dp_autotest_link_training(intel_dp);
> +		break;
> +	case DP_TEST_LINK_VIDEO_PATTERN:
> +		DRM_DEBUG_KMS("TEST_PATTERN test requested\n");
> +		intel_dp->compliance_test_type = DP_TEST_LINK_VIDEO_PATTERN;
> +		response = intel_dp_autotest_video_pattern(intel_dp);
> +		break;
> +	case DP_TEST_LINK_EDID_READ:
> +		DRM_DEBUG_KMS("EDID test requested\n");
> +		intel_dp->compliance_test_type = DP_TEST_LINK_EDID_READ;
> +		response = intel_dp_autotest_edid(intel_dp);
> +		break;
> +	case DP_TEST_LINK_PHY_TEST_PATTERN:
> +		DRM_DEBUG_KMS("PHY_PATTERN test requested\n");
> +		intel_dp->compliance_test_type = DP_TEST_LINK_PHY_TEST_PATTERN;
> +		response = intel_dp_autotest_phy_pattern(intel_dp);
> +		break;
> +	default:
> +		DRM_DEBUG_KMS("Invalid test request '%02x'\n", rxdata);
> +		break;
> +	}
> +
> +update_status:
> +	status = drm_dp_dpcd_write(&intel_dp->aux,
> +				   DP_TEST_RESPONSE,
> +				   &response, 1);
> +	if (status <= 0)
> +		DRM_DEBUG_KMS("Could not write test response to sink\n");
>  }
>  
>  static int
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 6a2ee0c..a4675fa 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -739,6 +739,9 @@ struct intel_dp {
>  				     bool has_aux_irq,
>  				     int send_bytes,
>  				     uint32_t aux_clock_divider);
> +
> +	/* Displayport compliance testing */
> +	unsigned long compliance_test_type;
>  };
>  
>  struct intel_digital_port {
> -- 
> 1.9.1
> 
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> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch