Re: [PATCH] drm/amd/display: remove redundant check

[Aurabindo Pillai]

On 10/29/2023 8:44 AM, José Pekkarinen wrote:
> This patch addresses the following warning spotted by
> using coccinelle where the case checked does the same
> than the else case.
>
> drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c:4664:8-10: WARNING: possible condition with no effect (if == else)
>
> Signed-off-by: José Pekkarinen <jose.pekkarinen@xxxxxxxxxxx>
> ---
>   .../drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c   | 4 ----
>   1 file changed, 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c
> index ecea008f19d3..d940dfa5ae43 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c
> +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c
> @@ -4661,10 +4661,6 @@ void dml32_CalculateMinAndMaxPrefetchMode(
>   	} else if (AllowForPStateChangeOrStutterInVBlankFinal == dm_prefetch_support_uclk_fclk_and_stutter) {
>   		*MinPrefetchMode = 0;
>   		*MaxPrefetchMode = 0;
> -	} else if (AllowForPStateChangeOrStutterInVBlankFinal ==
> -			dm_prefetch_support_uclk_fclk_and_stutter_if_possible) {
> -		*MinPrefetchMode = 0;
> -		*MaxPrefetchMode = 3;
>   	} else {
>   		*MinPrefetchMode = 0;
>   		*MaxPrefetchMode = 3;

What tree did you use to generate the patch? On amd-staging-drm-next, 
MaxPrefetchMode is 0 for the second last branch, which is the correct 
one, so this patch isnt needed.