Commit f79b468e authored Aug 07, 2015 by Thulasimani,Sivakumar Committed by Daniel Vetter Aug 14, 2015

drm/i915: fix checksum write for automated test reply



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>

parent ca5a0fbd

drivers/gpu/drm/i915/intel_dp.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -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");