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

[Daniel Vetter]

On Wed, Aug 12, 2015 at 11:36:07AM +0530, Sivakumar Thulasimani wrote:
> Hi Daniel,
>     any comments for the patch below ?

Find me a reviewer to r-b stamp this patch and I'll merge.
-Daniel

> 
> 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");
> 

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