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SubjectRe: [PATCH v2] virtio-gpu: add VIRTIO_GPU_F_EDID feature
On Fri, Oct 05, 2018 at 04:38:11PM +0200, Christophe de Dinechin wrote:
>
>
> > On 5 Oct 2018, at 14:51, Gerd Hoffmann <kraxel@redhat.com> wrote:
> >
> > The feature allows the guest request an EDID blob (describing monitor
> > capabilities) for a given scanout (aka virtual monitor connector).
> >
> > It brings a new command message, which has just a scanout field (beside
> > the standard virtio-gpu header) and a response message which carries the
> > EDID data.
> >
> > Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> > ---
> > include/uapi/linux/virtio_gpu.h | 17 +++++++++++++++++
> > 1 file changed, 17 insertions(+)
> >
> > diff --git a/include/uapi/linux/virtio_gpu.h b/include/uapi/linux/virtio_gpu.h
> > index f43c3c6171..1cef1ff339 100644
> > --- a/include/uapi/linux/virtio_gpu.h
> > +++ b/include/uapi/linux/virtio_gpu.h
> > @@ -41,6 +41,7 @@
> > #include <linux/types.h>
> >
> > #define VIRTIO_GPU_F_VIRGL 0
> > +#define VIRTIO_GPU_F_EDID 1
> >
> > enum virtio_gpu_ctrl_type {
> > VIRTIO_GPU_UNDEFINED = 0,
> > @@ -56,6 +57,7 @@ enum virtio_gpu_ctrl_type {
> > VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING,
> > VIRTIO_GPU_CMD_GET_CAPSET_INFO,
> > VIRTIO_GPU_CMD_GET_CAPSET,
> > + VIRTIO_GPU_CMD_GET_EDID,
> >
> > /* 3d commands */
> > VIRTIO_GPU_CMD_CTX_CREATE = 0x0200,
> > @@ -76,6 +78,7 @@ enum virtio_gpu_ctrl_type {
> > VIRTIO_GPU_RESP_OK_DISPLAY_INFO,
> > VIRTIO_GPU_RESP_OK_CAPSET_INFO,
> > VIRTIO_GPU_RESP_OK_CAPSET,
> > + VIRTIO_GPU_RESP_OK_EDID,
> >
> > /* error responses */
> > VIRTIO_GPU_RESP_ERR_UNSPEC = 0x1200,
> > @@ -291,6 +294,20 @@ struct virtio_gpu_resp_capset {
> > __u8 capset_data[];
> > };
> >
> > +/* VIRTIO_GPU_CMD_GET_EDID */
> > +struct virtio_gpu_get_edid {
> > + struct virtio_gpu_ctrl_hdr hdr;
> > + __le32 scanout;
> > +};
> > +
> > +/* VIRTIO_GPU_RESP_OK_EDID */
> > +struct virtio_gpu_resp_edid {
> > + struct virtio_gpu_ctrl_hdr hdr;
> > + __le32 scanout;
> > + __le32 size;
> > + __u8 edid[1024];
>
> Wouldn’t it be enough to stick to EDID 2.0 (256 bytes)?
>
> If not, maybe add comment to explain why you chose 1024.

EDID in the wild can be up to 512 bytes.
-Daniel

>
> > +};
> > +
> > #define VIRTIO_GPU_EVENT_DISPLAY (1 << 0)
> >
> > struct virtio_gpu_config {
> > --
> > 2.9.3
> >
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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