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Message-ID: <1ce5a7ae-b38e-433b-8f73-4bfc95bfe9c3@amd.com>
Date: Mon, 30 Oct 2023 12:53:58 -0400
From: Aurabindo Pillai <aurabindo.pillai@....com>
To: José Pekkarinen <jose.pekkarinen@...hound.fi>
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 12:26, José Pekkarinen wrote:
> 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.
Actually, you're right - the patch's limited context mislead me, sorry.
But please add the following tag and sent it to stable@...r.kernel.org
instead:
Fixes: 974ce181 ("drm/amd/display: Add check for PState change in DCN32")
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