Hi Am 05.01.21 um 12:04 schrieb Gerd Hoffmann:
Hi,It's not possible to do page flip with this virtual device. The call to SYNTHVID_VRAM_LOCATION is only honoured once. So unfortunately need to use SHMEM helpers.I was thinking about using struct video_output_situation.vram_offset; in case you want to tinker with that. There's a comment in the patch that vram_offset should always be 0. But this comment seems incorrect for devices with more than one output.Where does the comment come from? fbdev drivers support a single framebuffer only so for a fbdev driver it makes sense to set the offset to 0 unconditionally. With drm you probably can handle things differently ...
I cannot find it in hyperv_fb.c; it must have gotten introduced here.Only one display is supported by this DRM driver, so the comment is correct. In the future, having support for multiple displays might be an option.
Best regards Thomas
take care, Gerd _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Felix Imendörffer
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