[PATCH 4/4] drm/amdgpu/gmc9: disable legacy vga features in gmc init

[Huang Rui]

On Tue, Jul 25, 2017 at 01:06:42PM +0800, Huang Rui wrote:
> On Tue, Jul 25, 2017 at 04:06:00AM +0000, Deucher, Alexander wrote:
> > > -----Original Message-----
> > > From: Alex Deucher [mailto:alexdeucher at gmail.com]
> > > Sent: Monday, July 24, 2017 11:31 PM
> > > To: amd-gfx at lists.freedesktop.org
> > > Cc: Deucher, Alexander
> > > Subject: [PATCH 4/4] drm/amdgpu/gmc9: disable legacy vga features in gmc
> > > init
> > > 
> > > Needs to be done when the MC is set up.
> > > 
> > > Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> > 
> > Can someone see if this patch fixes the problem with the lower 8 MB of vram on vega10?  I think this may explain what was messing with vram on resume that caused us to reserve the first 8 MB of vram.
> > 
> 
> Let me have a try. The start of vram overwrite is probably still caused by
> VGA mode. So, here, you disable it at first.
> 

This patch doesn't fix the start 8 MB of vram corruption.
But I just found the 8M corruption issue only encountered when DC is disabled.

Thanks,
Ray