Re: [PATCH v2] drm/i915/dp: do not proceed with autotests if we don't ACK them

[Manasi Navare <manasi.d.navare@intel.com>]

Thanks for this patch. I have tested this on DPR 120 compliance test device
and verified that it works as expected.

Manasi

On Fri, Jan 20, 2017 at 07:04:06PM +0200, Jani Nikula wrote:
> There is no point in setting intel_dp->compliance.test_type, and
> proceeding with the autotests, if we're about to NAK the request. Some
> drive-by cleanups while at it.
> 
> v2: look at the ACK bit, as the result may also contain
>     TEST_EDID_CHECKSUM_WRITE
> 

 Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
 Tested-by: Manasi Navare <manasi.d.navare@intel.com>
> Cc: Manasi Navare <manasi.d.navare@intel.com>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c | 21 +++++++++------------
>  1 file changed, 9 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index e80d620846c8..247fbf352576 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3985,45 +3985,42 @@ static uint8_t intel_dp_autotest_phy_pattern(struct intel_dp *intel_dp)
>  static void intel_dp_handle_test_request(struct intel_dp *intel_dp)
>  {
>  	uint8_t response = DP_TEST_NAK;
> -	uint8_t rxdata = 0;
> -	int status = 0;
> +	uint8_t request = 0;
> +	int status;
>  
> -	status = drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_REQUEST, &rxdata, 1);
> +	status = drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_REQUEST, &request);
>  	if (status <= 0) {
>  		DRM_DEBUG_KMS("Could not read test request from sink\n");
>  		goto update_status;
>  	}
>  
> -	switch (rxdata) {
> +	switch (request) {
>  	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);
> +		DRM_DEBUG_KMS("Invalid test request '%02x'\n", request);
>  		break;
>  	}
>  
> +	if (response & DP_TEST_ACK)
> +		intel_dp->compliance.test_type = request;
> +
>  update_status:
> -	status = drm_dp_dpcd_write(&intel_dp->aux,
> -				   DP_TEST_RESPONSE,
> -				   &response, 1);
> +	status = drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_RESPONSE, response);
>  	if (status <= 0)
>  		DRM_DEBUG_KMS("Could not write test response to sink\n");
>  }
> -- 
> 2.1.4
> 
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