On Mon, Mar 27, 2023 at 7:36 PM Caio Novais <caionov...@usp.br> wrote:
>
> Compiling AMD GPU drivers displays a warning:
>
> drivers/gpu/drm/amd/amdgpu/../display/dc/link/protocols/link_dp_capability.c:
> In function ‘dpcd_set_source_specific_data’:
> drivers/gpu/drm/amd/amdgpu/../display/dc/link/protocols/link_dp_capability.c:1290:32:
> warning: variable ‘result_write_min_hblank’ set but not used
> [-Wunused-but-set-variable]
>
> Get rid of it by removing the variable 'result_write_min_hblank' and
> 'hblank_size'.
>
> Signed-off-by: Caio Novais <caionov...@usp.br>
> ---
> .../drm/amd/display/dc/link/protocols/link_dp_capability.c | 7 -------
> 1 file changed, 7 deletions(-)
>
> diff --git
> a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
> b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
> index d4370856f164..7392fcf17653 100644
> --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
> +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
> @@ -1287,7 +1287,6 @@ void dc_link_overwrite_extended_receiver_cap(
> void dpcd_set_source_specific_data(struct dc_link *link)
> {
> if (!link->dc->vendor_signature.is_valid) {
> - enum dc_status result_write_min_hblank = DC_NOT_SUPPORTED;
> struct dpcd_amd_signature amd_signature = {0};
> struct dpcd_amd_device_id amd_device_id = {0};
>
> @@ -1324,16 +1323,10 @@ void dpcd_set_source_specific_data(struct dc_link
> *link)
> if (link->ctx->dce_version >= DCN_VERSION_2_0 &&
> link->dc->caps.min_horizontal_blanking_period != 0) {
>
> - uint8_t hblank_size =
> (uint8_t)link->dc->caps.min_horizontal_blanking_period;
> -
> - result_write_min_hblank = core_link_write_dpcd(link,
> - DP_SOURCE_MINIMUM_HBLANK_SUPPORTED, (uint8_t
> *)(&hblank_size),
> - sizeof(hblank_size));
This writes to the monitor. We shouldn't remove this.
> }
> DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION,
>
> WPP_BIT_FLAG_DC_DETECTION_DP_CAPS,
> "result=%u
> link_index=%u enum dce_version=%d DPCD=0x%04X min_hblank=%u
> branch_dev_id=0x%x branch_dev_name='%c%c%c%c%c%c'",
> -
> result_write_min_hblank,
You are dropping information from the debug logging. Maybe it would
be better to just flag this as maybe unused. Also, I'd suggest
rebasing on the latest amdgpu -next branch, as I think a lot of these
were already fixed last week or the week before.
Alex
> link->link_index,
>
> link->ctx->dce_version,
>
> DP_SOURCE_MINIMUM_HBLANK_SUPPORTED,
> --
> 2.40.0
>
