I apologise for not putting the question properly. I am referring virtio spec to understand the driver and device operation - I had a few questions on pixel data, as it was not working as expected.
My display is working fine now; thanks for your help. Regards, Pratik On Tue, 21 Dec 2021 at 16:41, Gerd Hoffmann <kra...@redhat.com> wrote: > On Mon, Dec 20, 2021 at 10:44:06PM +0530, Pratik Parvati wrote: > > > EDID is optional, so you can try disable the EDID feature bit and see > > > what happens. > > > > Thanks Gerd, after disabling the EDID, I was able to get the required > > resolution (basically width and height) from the driver. > > > > Another strange observation - When the device receives the > > command VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING with the number of > > entries having a pixel data in scatter gather format, the device is > trying > > to store these bytes in contiguous memory. When I read those sg memory, > the > > device receives all zeros from the driver (for a 1024x768 display, > > the device receives 3MB of data from the driver). Is this an expected > > behaviour? - If not, what is the driver trying to display on the screen? > > How about reading the virtio spec? > display updates are handled with transfer and flush commands. > > take care, > Gerd > >
