[PATCH] drm/amd/display: Fully switch to dmub for all dcn21 asics

[Alex Deucher]

On Fri, Oct 15, 2021 at 6:33 PM <Roman.Li at amd.com> wrote:
>
> From: Roman Li <Roman.Li at amd.com>
>
> [Why]
> On renoir usb-c port stops functioning on resume after f/w update.
> New dmub firmware caused regression due to conflict with dmcu.
> With new dmub f/w dmcu is superseded and should be disabled.
>
> [How]
> - Disable dmcu for all dcn21.
>
> Check dmesg for dmub f/w version.
> The old firmware (before regression):
> [drm] DMUB hardware initialized: version=0x00000001
> All other versions require that patch for renoir.
>
> Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1735
> Cc: stable at vger.kernel.org
> Signed-off-by: Roman Li <Roman.Li at amd.com>

Acked-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 +--
>  1 file changed, 1 insertion(+), 2 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 ff54550..e56f73e 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -1356,8 +1356,7 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
>                 switch (adev->ip_versions[DCE_HWIP][0]) {
>                 case IP_VERSION(2, 1, 0):
>                         init_data.flags.gpu_vm_support = true;
> -                       if (ASICREV_IS_GREEN_SARDINE(adev->external_rev_id))
> -                               init_data.flags.disable_dmcu = true;
> +                       init_data.flags.disable_dmcu = true;
>                         break;
>                 case IP_VERSION(1, 0, 0):
>                 case IP_VERSION(1, 0, 1):
> --
> 2.7.4
>