[PATCH] drm/amdgpu: Skip init fbdev if virtual_display is enabled

[Alex Deucher]

On Fri, May 20, 2022 at 10:12 AM Slivka, Danijel <Danijel.Slivka at amd.com> wrote:
>
> [AMD Official Use Only - General]
>
> Hi,
>
> Based on the code we shouldn't init the fbdev on hw without DCE:

That comment means don't init fbdev on chips without display hardware
(either real or virtual).  E.g., iceland or MI100.

Alex

>
>         /*
>          * 1. don't init fbdev on hw without DCE
>          * 2. don't init fbdev if there are no connectors
>          */
>         if (adev->mode_info.mode_config_initialized &&
>             !list_empty(&adev_to_drm(adev)->mode_config.connector_list)) {
>                 /* select 8 bpp console on low vram cards */
>                 if (adev->gmc.real_vram_size <= (32*1024*1024))
>                         drm_fbdev_generic_setup(adev_to_drm(adev), 8);
>                 else
>                         drm_fbdev_generic_setup(adev_to_drm(adev), 32);
>         }
>
> For virtualization we always use virtual_display and doesn’t have the hw DCE for that reason setting up fbdev should be skipped.
>
>
> BR,
> Danijel Slivka
>
> -----Original Message-----
> From: Alex Deucher <alexdeucher at gmail.com>
> Sent: Friday, May 20, 2022 3:30 PM
> To: Slivka, Danijel <Danijel.Slivka at amd.com>
> Cc: amd-gfx list <amd-gfx at lists.freedesktop.org>
> Subject: Re: [PATCH] drm/amdgpu: Skip init fbdev if virtual_display is enabled
>
> On Fri, May 20, 2022 at 3:59 AM Danijel Slivka <danijel.slivka at amd.com> wrote:
> >
> > In case virtaul_display is enabled there is no hw DCE so need to skip
> > setting up fbdev.
>
> Wouldn't you theoretically still want fbdev even if it is virtual?
>
> Alex
>
> >
> > Signed-off-by: Danijel Slivka <danijel.slivka at amd.com>
> > ---
> >  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > index 3b9dc1803be9..8d03eec49eef 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > @@ -2095,6 +2095,7 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
> >          * 2. don't init fbdev if there are no connectors
> >          */
> >         if (adev->mode_info.mode_config_initialized &&
> > +           !adev->enable_virtual_display &&
> >             !list_empty(&adev_to_drm(adev)->mode_config.connector_list)) {
> >                 /* select 8 bpp console on low vram cards */
> >                 if (adev->gmc.real_vram_size <= (32*1024*1024))
> > --
> > 2.25.1
> >