[PATCH] drm/amd/display: add dmcub check on RENOIR

[Kazlauskas, Nicholas]

Looks good to me.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>

Regards,
Nicholas Kazlauskas

On 2020-07-08 10:15 a.m., Deucher, Alexander wrote:
> [AMD Public Use]
> 
> 
> [AMD Public Use]
> 
> 
> Acked-by: Alex Deucher <alexander.deucher at amd.com>
> ------------------------------------------------------------------------
> *From:* Aaron Ma <aaron.ma at canonical.com>
> *Sent:* Wednesday, July 8, 2020 4:16 AM
> *To:* Wentland, Harry <Harry.Wentland at amd.com>; Li, Sun peng (Leo) 
> <Sunpeng.Li at amd.com>; Deucher, Alexander <Alexander.Deucher at amd.com>; 
> Koenig, Christian <Christian.Koenig at amd.com>; airlied at linux.ie 
> <airlied at linux.ie>; daniel at ffwll.ch <daniel at ffwll.ch>; 
> amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>; 
> dri-devel at lists.freedesktop.org <dri-devel at lists.freedesktop.org>; 
> linux-kernel at vger.kernel.org <linux-kernel at vger.kernel.org>; 
> mapengyu at gmail.com <mapengyu at gmail.com>; aaron.ma at canonical.com 
> <aaron.ma at canonical.com>
> *Subject:* [PATCH] drm/amd/display: add dmcub check on RENOIR
> RENOIR loads dmub fw not dmcu, check dmcu only will prevent loading iram,
> it breaks backlight control.
> 
> Bug: 
> https://bugzilla.kernel.org/show_bug.cgi?id=208277 
> <https://bugzilla.kernel.org/show_bug.cgi?id=208277>
> Signed-off-by: Aaron Ma <aaron.ma at canonical.com>
> ---
>   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 10ac8076d4f2..db5e0bb0d935 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -1358,7 +1358,7 @@ static int dm_late_init(void *handle)
>           struct dmcu *dmcu = NULL;
>           bool ret;
> 
> -       if (!adev->dm.fw_dmcu)
> +       if (!adev->dm.fw_dmcu && !adev->dm.dmub_fw)
>                   return detect_mst_link_for_all_connectors(adev->ddev);
> 
>           dmcu = adev->dm.dc->res_pool->dmcu;
> -- 
> 2.25.1
> 
> 
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