[PATCH 40/66] drm/amd/display: Write TEST_EDID_CHECKSUM_WRITE for EDID tests

[Qingqing Zhuo]

From: Mikita Lipski <mikita.lip...@amd.com>

Extract edid's checksum and send it back for verification if EDID_TEST
is requested.

Signed-off-by: Mikita Lipski <mikita.lip...@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pil...@amd.com>
---
 .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 30 +++++++++++++++++--
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c 
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index c6ce2b7123b7..09e056a64708 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -885,10 +885,34 @@ enum dc_edid_status dm_helpers_read_local_edid(
                DRM_ERROR("EDID err: %d, on connector: %s",
                                edid_status,
                                aconnector->base.name);
+       if (link->aux_mode) {
+               union test_request test_request = {0};
+               union test_response test_response = {0};
 
-       /* DP Compliance Test 4.2.2.3 */
-       if (link->aux_mode)
-               drm_dp_send_real_edid_checksum(&aconnector->dm_dp_aux.aux, 
sink->dc_edid.raw_edid[sink->dc_edid.length-1]);
+               dm_helpers_dp_read_dpcd(ctx,
+                                       link,
+                                       DP_TEST_REQUEST,
+                                       &test_request.raw,
+                                       sizeof(union test_request));
+
+               if (!test_request.bits.EDID_READ)
+                       return edid_status;
+
+               test_response.bits.EDID_CHECKSUM_WRITE = 1;
+
+               dm_helpers_dp_write_dpcd(ctx,
+                                       link,
+                                       DP_TEST_EDID_CHECKSUM,
+                                       
&sink->dc_edid.raw_edid[sink->dc_edid.length-1],
+                                       1);
+
+               dm_helpers_dp_write_dpcd(ctx,
+                                       link,
+                                       DP_TEST_RESPONSE,
+                                       &test_response.raw,
+                                       sizeof(test_response));
+
+       }
 
        return edid_status;
 }
-- 
2.34.1