linux-kernel - Re: [PATCH] drm/amdgpu: fix that issue that the number of the crtc of the 3250c is not correct

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Date:   Thu, 27 Jan 2022 10:33:37 -0500
From:   Mark Yacoub <markyacoub@...gle.com>
To:     RyanLin <tsung-hua.lin@....com>
Cc:     harry.wentland@....com, sunpeng.li@....com,
        alexander.deucher@....com, christian.koenig@....com,
        David1.Zhou@....com, airlied@...ux.ie, daniel@...ll.ch,
        seanpaul@...omium.org, bas@...nieuwenhuizen.nl,
        nicholas.kazlauskas@....com, sashal@...nel.org,
        VictorChengChi.Lu@....com,
        ching-shih.li@....corp-partner.google.com,
        Rodrigo.Siqueira@....com, ddavenport@...omium.org,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amdgpu: fix that issue that the number of the crtc of
 the 3250c is not correct

On Thu, Jan 27, 2022 at 3:12 AM RyanLin <Tsung-Hua.Lin@....com> wrote:
>
> [Why]
> External displays take priority over internal display when there are fewer
> display controllers than displays.
>
> [How]
> The root cause is because of that number of the crtc is not correct.
> The number of the crtc on the 3250c is 3, but on the 3500c is 4.
> On the source code, we can see that number of the crtc has been fixed at 4.
> Needs to set the num_crtc to 3 for 3250c platform.
>
> Signed-off-by: RyanLin <Tsung-Hua.Lin@....com>
> Change-Id: I837df7101cc4849d2c3021fd529b4061edab4bb1
Please drop the gerrit ID.
> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
>
> 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 40c91b448f7d..dbeef7b57a9b 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -2738,9 +2738,15 @@ static int dm_early_init(void *handle)
>                 break;
>  #if defined(CONFIG_DRM_AMD_DC_DCN1_0)
>         case CHIP_RAVEN:
> -               adev->mode_info.num_crtc = 4;
> -               adev->mode_info.num_hpd = 4;
> -               adev->mode_info.num_dig = 4;
> +               if (adev->rev_id >= 8) { //chip_name = "raven2";
> +                       adev->mode_info.num_crtc = 3;
> +                       adev->mode_info.num_hpd = 3;
> +                       adev->mode_info.num_dig = 3;
> +               } else {
> +                       adev->mode_info.num_crtc = 4;
> +                       adev->mode_info.num_hpd = 4;
> +                       adev->mode_info.num_dig = 4;
> +               }
>                 break;
>  #endif
>  #if defined(CONFIG_DRM_AMD_DC_DCN2_0)
> --
> 2.25.1
>