linux-kernel - Re: [PATCH] drm/amd/display: fix mode scaling (RMX

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Date:   Fri, 18 Aug 2023 09:28:30 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Hamza Mahfooz <hamza.mahfooz@....com>
Cc:     amd-gfx@...ts.freedesktop.org, Stylon Wang <stylon.wang@....com>,
        Alan Liu <haoping.liu@....com>,
        Srinivasan Shanmugam <srinivasan.shanmugam@....com>,
        Leo Li <sunpeng.li@....com>,
        Qingqing Zhuo <qingqing.zhuo@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Aurabindo Pillai <aurabindo.pillai@....com>,
        Hersen Wu <hersenxs.wu@....com>, Wayne Lin <wayne.lin@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        Joshua Ashton <joshua@...ggi.es>
Subject: Re: [PATCH] drm/amd/display: fix mode scaling (RMX_.*)

On Fri, Aug 18, 2023 at 9:25 AM Hamza Mahfooz <hamza.mahfooz@....com> wrote:
>
> As made mention of in commit 4a2df0d1f28e ("drm/amd/display: Fixed
> non-native modes not lighting up"), we shouldn't call
> drm_mode_set_crtcinfo() once the crtc timings have been decided. Since,
> it can cause settings to be unintentionally overwritten. So, since
> dm_state is never NULL now, we can use old_stream to determine if we
> should call drm_mode_set_crtcinfo() because we only need to set the crtc
> timing parameters for entirely new streams.
>
> Cc: Harry Wentland <harry.wentland@....com>
> Cc: Rodrigo Siqueira <rodrigo.siqueira@....com>
> Fixes: 712237a4a1b4 ("drm/amd/display: Always set crtcinfo from create_stream_for_sink")
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@....com>

Does this fix:
https://gitlab.freedesktop.org/drm/amd/-/issues/2783
If so, add a link tag for that.

Alex

> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 3b27b7742854..e9aff5014e39 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -6035,7 +6035,7 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
>
>         if (recalculate_timing)
>                 drm_mode_set_crtcinfo(&saved_mode, 0);
> -       else
> +       else if (!old_stream)
>                 drm_mode_set_crtcinfo(&mode, 0);
>
>         /*
> --
> 2.41.0
>