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Message-ID: <CADnq5_MP85Qqv9N6VYnyRYAACU82G+e1oXyESUYoqp=QMYEbYg@mail.gmail.com>
Date: Tue, 22 Sep 2020 11:19:12 -0400
From: Alex Deucher <alexdeucher@...il.com>
To: Nathan Chancellor <natechancellor@...il.com>,
"Wentland, Harry" <Harry.Wentland@....com>,
"Leo (Sunpeng) Li" <Sunpeng.Li@....com>
Cc: Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
clang-built-linux <clang-built-linux@...glegroups.com>,
Maling list - DRI developers
<dri-devel@...ts.freedesktop.org>,
amd-gfx list <amd-gfx@...ts.freedesktop.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amd/display: Simplify condition in try_disable_dsc
On Tue, Sep 22, 2020 at 3:47 AM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> Clang warns:
>
> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:637:8:
> warning: logical not is only applied to the left hand side of this
> comparison [-Wlogical-not-parentheses]
> && !params[i].clock_force_enable == DSC_CLK_FORCE_DEFAULT) {
> ^ ~~
> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:637:8:
> note: add parentheses after the '!' to evaluate the comparison first
> && !params[i].clock_force_enable == DSC_CLK_FORCE_DEFAULT) {
> ^
> (
> )
> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:637:8:
> note: add parentheses around left hand side expression to silence this
> warning
> && !params[i].clock_force_enable == DSC_CLK_FORCE_DEFAULT) {
> ^
> ( )
> 1 warning generated.
>
> The expression "!a == 0" can be more simply written as "a", which makes
> it easier to reason about the logic and prevents the warning.
>
> Fixes: 0749ddeb7d6c ("drm/amd/display: Add DSC force disable to dsc_clock_en debugfs entry")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1158
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
@Wentland, Harry or @Leo (Sunpeng) Li can you provide some guidance
on what the logic is supposed to be here?
Thanks,
Alex
> ---
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 2 +-
> 1 file changed, 1 insertion(+), 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 9d7333a36fac..0852a24ee392 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
> @@ -634,7 +634,7 @@ static void try_disable_dsc(struct drm_atomic_state *state,
> for (i = 0; i < count; i++) {
> if (vars[i].dsc_enabled
> && vars[i].bpp_x16 == params[i].bw_range.max_target_bpp_x16
> - && !params[i].clock_force_enable == DSC_CLK_FORCE_DEFAULT) {
> + && params[i].clock_force_enable) {
> kbps_increase[i] = params[i].bw_range.stream_kbps - params[i].bw_range.max_kbps;
> tried[i] = false;
> remaining_to_try += 1;
>
> base-commit: 6651cdf3bfeeaeb499db11668313666bf756579a
> --
> 2.28.0
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
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