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

Sivakumar Thulasimani
2015-07-22T10:01:37Z

From: "Thulasimani,Sivakumar" <sivakumar.thulasimani@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.

Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
---
drivers/gpu/drm/i915/intel_dp.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index f1b9f93..9617d04 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4090,9 +4090,18 @@ 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;
+ uint8_t temp = intel_connector->detect_edid->extensions;
+
+ /* We have to write the checksum
+ * of the last block read
+ */
+ while (temp--)
+ block++;
+
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");

--
1.7.9.5