[Intel-gfx] [PATCH] drm/i915: fix checksum write for automated test reply

[Sivakumar Thulasimani]

Hi Daniel,
     any comments for the patch below ?

regards,
Sivakumar

On Friday 07 August 2015 03:14 PM, Sivakumar Thulasimani wrote:
> From: "Thulasimani,Sivakumar" <sivakumar.thulasimani at intel.com>
>
> DP spec requires the checksum of the last block read to be written
> when replying to TEST_EDID_READ. This patch fixes the current code
> to do the same.
>
> v2: removed loop for jumping blocks and performed direct addition
> as recommended by Daniel
>
> Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani at intel.com>
> ---
>   drivers/gpu/drm/i915/intel_dp.c |    9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index f1b9f93..fa6e202 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -4090,9 +4090,16 @@ static uint8_t intel_dp_autotest_edid(struct intel_dp *intel_dp)
>   				      intel_dp->aux.i2c_defer_count);
>   		intel_dp->compliance_test_data = INTEL_DP_RESOLUTION_FAILSAFE;
>   	} else {
> +		struct edid *block = intel_connector->detect_edid;
> +
> +		/* We have to write the checksum
> +		 * of the last block read
> +		 */
> +		block += intel_connector->detect_edid->extensions;
> +
>   		if (!drm_dp_dpcd_write(&intel_dp->aux,
>   					DP_TEST_EDID_CHECKSUM,
> -					&intel_connector->detect_edid->checksum,
> +					&block->checksum,
>   					1))
>   			DRM_DEBUG_KMS("Failed to write EDID checksum\n");
>