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

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Date:   Mon, 30 Oct 2023 18:26:34 +0200
From:   José Pekkarinen <jose.pekkarinen@...hound.fi>
To:     Aurabindo Pillai <aurabindo.pillai@....com>
Cc:     harry.wentland@....com, sunpeng.li@....com,
        Rodrigo.Siqueira@....com, skhan@...uxfoundation.org,
        alexander.deucher@....com, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch,
        dillon.varone@....com, Jun.Lei@....com, george.shen@....com,
        samson.tam@....com, SyedSaaem.Rizvi@....com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH] drm/amd/display: remove redundant check

On 2023-10-30 15:52, Aurabindo Pillai wrote:
> 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@...hound.fi>
>> ---
>>   .../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.

     I'm using the stable tree, sorry, if it is out of
date just ignore it then.

     Thanks!

     José.