Currently the dm_dp_aux_transfer() does not parse
the return value of dal_ddc_service_read_dpcd_data(), which also
has a failure case.
This patch captures the same and ensures the i2c operation status is
sent provided appropriately to the callers to it.
Signed-off-by: Shirish S <shiris...@amd.com>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 782491e..7ac124d 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -115,7 +115,11 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux,
msg->address,
msg->buffer,
msg->size);
- return read_bytes;
+ if (read_bytes != msg->size &&
+ read_bytes >= DDC_RESULT_FAILED_OPERATION)
+ return -EIO;
+ else
+ return read_bytes;
case DP_AUX_I2C_WRITE:
res = dal_ddc_service_write_dpcd_data(
TO_DM_AUX(aux)->ddc_service,
--
2.7.4
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