linux-kernel - Re: [PATCH 02/10] drm/virtio: fix pageflip flush

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Date:   Wed, 02 Jan 2019 14:09:52 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     Gerd Hoffmann <kraxel@...hat.com>, dri-devel@...ts.freedesktop.org,
        David Airlie <airlied@...hat.com>
Cc:     David Airlie <airlied@...ux.ie>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 02/10] drm/virtio: fix pageflip flush

On Wed, 2018-12-19 at 13:27 +0100, Gerd Hoffmann wrote:
> Sending the flush command only makes sense if we actually have
> a framebuffer attached to the scanout (handle != 0).
> 
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> ---
>  drivers/gpu/drm/virtio/virtgpu_plane.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c
> index ead5c53d4e..548265b8e8 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_plane.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
> @@ -130,11 +130,12 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
>  				   plane->state->src_h >> 16,
>  				   plane->state->src_x >> 16,
>  				   plane->state->src_y >> 16);
> -	virtio_gpu_cmd_resource_flush(vgdev, handle,
> -				      plane->state->src_x >> 16,
> -				      plane->state->src_y >> 16,
> -				      plane->state->src_w >> 16,
> -				      plane->state->src_h >> 16);
> +	if (handle)
> +		virtio_gpu_cmd_resource_flush(vgdev, handle,
> +					      plane->state->src_x >> 16,
> +					      plane->state->src_y >> 16,
> +					      plane->state->src_w >> 16,
> +					      plane->state->src_h >> 16);
>  }
>  
>  static int virtio_gpu_cursor_prepare_fb(struct drm_plane *plane,

Reviewed-by: Ezequiel Garcia <ezequiel@...labora.com>

Regards,
Ezequiel