On 2018-04-17 10:56 PM, Shirish S wrote: > 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 appropriately to the drm framework. > > V2: Updated commit message. > > Signed-off-by: Shirish S <shirish.s at 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) This doesn't look right. We shouldn't be returning the size or error code from the same function. This will not work if we submit a read 7 or 8 bytes and get an error. Harry > + return -EIO; > + else > + return read_bytes; > case DP_AUX_I2C_WRITE: > res = dal_ddc_service_write_dpcd_data( > TO_DM_AUX(aux)->ddc_service, >
