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drm/i915: fix checksum write for automated test reply

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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@intel.com>
Reviewed-by: Sonika Jindal <sonika.jindal@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Thulasimani,Sivakumar 2015-08-07 15:14:30 +05:30 committed by Daniel Vetter
parent ca5a0fbd53
commit f79b468eca
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/i915/intel_dp.c
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@ -4139,9 +4139,16 @@ 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");