[Public] > -----Original Message----- > From: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> > Sent: Tuesday, January 25, 2022 09:50 > To: Limonciello, Mario <Mario.Limonciello@xxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx; Deucher, Alexander > <Alexander.Deucher@xxxxxxx>; Wentland, Harry > <Harry.Wentland@xxxxxxx> > Subject: Re: [PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for > DCN2 > > On Tue, Jan 25, 2022 at 09:21:11AM -0600, Mario Limonciello wrote: > > For some reason this file isn't using the appropriate register > > headers for DCN headers, which means that on DCN2 we're getting > > the VIEWPORT_DIMENSION offset wrong. > > > > This means that we're not correctly carving out the framebuffer > > memory correctly for a framebuffer allocated by EFI and > > therefore see corruption when loading amdgpu before the display > > driver takes over control of the framebuffer scanout. > > > > Fix this by checking the DCE_HWIP and picking the correct offset > > accordingly. > > > > Long-term we should expose this info from DC as GMC shouldn't > > need to know about DCN registers. > > > > Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx> > > (cherry picked from commit dc5d4aff2e99c312df8abbe1ee9a731d2913bc1b) > > --- > > This is backported from 5.17-rc1, but doesn't backport cleanly because > > v5.16 changed to IP version harvesting for ASIC detection. 5.15.y doesn't > > have this. > > drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 14 +++++++++++++- > > 1 file changed, 13 insertions(+), 1 deletion(-) > > What stable tree(s) do you want this applied to? > The original commit it was cherry-picked from was CC to @stable and it should have applied to 5.16 from that. This fixed commit should go into 5.15.y. > And what happened to the original signed-off-by's on the original > commit? I dropped them because I had to change code to do the backport, it didn't seem reasonable to me to keep all of their ACK's/signed-off-by's on the code still. If that's incorrect, please let me know and I can re-send with the exact same commit message. > > thanks, > > greg k-h
