Re: [PATCH] drm/virtgpu: Add PM support for suspend/resume

["Morris Pan (潘泰為)" <Morris.Pan@mediatek.com>]

On Wed, 2026-04-08 at 15:59 +0300, Dmitry Osipenko wrote:
> Hi,
> 
> On 4/1/26 09:10, Morris Pan wrote:
> > diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c
> > b/drivers/gpu/drm/virtio/virtgpu_drv.c
> > index a5ce96fb8a1d..fbca0a82958c 100644
> > --- a/drivers/gpu/drm/virtio/virtgpu_drv.c
> > +++ b/drivers/gpu/drm/virtio/virtgpu_drv.c
> > @@ -145,6 +145,40 @@ static void virtio_gpu_config_changed(struct
> > virtio_device *vdev)
> >  	schedule_work(&vgdev->config_changed_work);
> >  }
> >  
> > +#ifdef CONFIG_PM_SLEEP
> > +static int virtgpu_freeze(struct virtio_device *vdev)
> > +{
> > +	vdev->config->del_vqs(vdev);
> > +	virtio_reset_device(vdev);
> > +
> > +	return 0;
> > +}
> 
> VirtIO-GPU shouldn't be reset freely. See [1] and follow previous
> hibernation-support discussions on the ML.
> 
> [1[
> https://lore.kernel.org/dri-devel/20260107182745.229481-1-dongwon.kim@intel.com/
>  
> 

Hi Dmitry,

Thank you for the guidance and for pointing me to that thread.

I have looked into the series you mentioned, specifically "PATCH v7
1/3: drm/virtio: Freeze and restore hooks to support suspend and
resume" (link).
I have verified that this change resolves the issue I was experiencing
in my envirronment.

I will keep an eye on that series and follow its progress. Thank you
for your time and help.

Best regards,

Morris Pan