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From:   Alex Deucher <alexdeucher@gmail.com>
Date:   Thu, 29 Oct 2020 17:56:51 -0400
Message-ID: <CADnq5_ML599ZrTkRWtjm64EvU=p-uTVEEeVN5rXh+Yz6UhV3vA@mail.gmail.com>
Subject: Re: [PATCH -next] drm/amd/display: remove useless if/else
To:     Zou Wei <zou_wei@huawei.com>
Cc:     "Wentland, Harry" <harry.wentland@amd.com>,
        "Leo (Sunpeng) Li" <sunpeng.li@amd.com>,
        "Deucher, Alexander" <alexander.deucher@amd.com>,
        Christian Koenig <christian.koenig@amd.com>,
        Dave Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Maling list - DRI developers 
        <dri-devel@lists.freedesktop.org>,
        amd-gfx list <amd-gfx@lists.freedesktop.org>,
        LKML <linux-kernel@vger.kernel.org>
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Precedence: bulk

Applied.  Thanks!

Alex

On Wed, Oct 28, 2020 at 2:56 PM Zou Wei <zou_wei@huawei.com> wrote:
>
> Fix the following coccinelle report:
>
> ./drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c:1367:3-5:
> WARNING: possible condition with no effect (if == else)
>
> Both branches are the same, so remove the if/else altogether.
>
> Fixes: 81875979f0b2 ("drm/amd/display: Remove extra pairs of parentheses in dce_calcs.c")
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Zou Wei <zou_wei@huawei.com>
> ---
>  drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c b/drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c
> index 2c6db37..e4f29cd 100644
> --- a/drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c
> +++ b/drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c
> @@ -1364,13 +1364,10 @@ static void calculate_bandwidth(
>         /*if stutter and dram clock state change are gated before cursor then the cursor latency hiding does not limit stutter or dram clock state change*/
>         for (i = 0; i <= maximum_number_of_surfaces - 1; i++) {
>                 if (data->enable[i]) {
> -                       if (dceip->graphics_lb_nodownscaling_multi_line_prefetching == 1) {
> -                               data->maximum_latency_hiding[i] = bw_add(data->minimum_latency_hiding[i], bw_mul(bw_frc_to_fixed(5, 10), data->total_dmifmc_urgent_latency));
> -                       }
> -                       else {
> -                               /*maximum_latency_hiding(i) = minimum_latency_hiding(i) + 1 / vsr(i) * h_total(i) / pixel_rate(i) + 0.5 * total_dmifmc_urgent_latency*/
> -                               data->maximum_latency_hiding[i] = bw_add(data->minimum_latency_hiding[i], bw_mul(bw_frc_to_fixed(5, 10), data->total_dmifmc_urgent_latency));
> -                       }
> +                       /*maximum_latency_hiding(i) = minimum_latency_hiding(i) + 1 / vsr(i) **/
> +                       /*      h_total(i) / pixel_rate(i) + 0.5 * total_dmifmc_urgent_latency*/
> +                       data->maximum_latency_hiding[i] = bw_add(data->minimum_latency_hiding[i],
> +                               bw_mul(bw_frc_to_fixed(5, 10), data->total_dmifmc_urgent_latency));
>                         data->maximum_latency_hiding_with_cursor[i] = bw_min2(data->maximum_latency_hiding[i], data->cursor_latency_hiding[i]);
>                 }
>         }
> --
> 2.6.2
>
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