[AMD Official Use Only]
> -----Original Message-----
> From: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
> Sent: Monday, November 15, 2021 09:46
> To: Limonciello, Mario <Mario.Limonciello@xxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx; Deucher, Alexander
> <Alexander.Deucher@xxxxxxx>
> Subject: Re: [PATCH v2] drm/amd/display: Look at firmware version to
> determine using dmub on dcn21
>
> On Mon, Nov 15, 2021 at 09:36:55AM -0600, Mario Limonciello wrote:
> > commit 91adec9e0709 ("drm/amd/display: Look at firmware version to
> > determine using dmub on dcn21")
> >
> > Newer DMUB firmware on Renoir and Green Sardine do not need to
> disable
> > dmcu and this actually causes problems with DP-C alt mode for a number of
> > machines.
> >
> > Backport the fix from this from hand modified backport because mainline
> > switched to IP version checking which doesn't exist in linux-stable.
> >
> > BugLink:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitla
> b.freedesktop.org%2Fdrm%2Famd%2F-
> %2Fissues%2F1772&data=04%7C01%7Cmario.limonciello%40amd.com%
> 7C6601c50631344fa7148208d9a84f050a%7C3dd8961fe4884e608e11a82d994e1
> 83d%7C0%7C0%7C637725879609631767%7CUnknown%7CTWFpbGZsb3d8eyJ
> WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%
> 7C3000&sdata=jIGJARLqpAL6Vc6AyK8qVj1yZ7qFm5sXFj%2FerhoMEUc
> %3D&reserved=0
> > BugLink:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitla
> b.freedesktop.org%2Fdrm%2Famd%2F-
> %2Fissues%2F1735&data=04%7C01%7Cmario.limonciello%40amd.com%
> 7C6601c50631344fa7148208d9a84f050a%7C3dd8961fe4884e608e11a82d994e1
> 83d%7C0%7C0%7C637725879609631767%7CUnknown%7CTWFpbGZsb3d8eyJ
> WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%
> 7C3000&sdata=t8iG0MlBgncmZ5Py%2FhWuWBHMbSCCK%2BtFTV4faxcl
> N3c%3D&reserved=0
> > Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
> > Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
> > ---
> > Changes from v1->v2:
> > * Update commit message syntax for hand modified commit
> > drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 9 ++++++++-
> > 1 file changed, 8 insertions(+), 1 deletion(-)
>
> What tree(s) are you wanting this backported to?
5.13+
Thanks,
