On Wed, Jul 31, 2024 at 03:15:39PM +0200, Daniel Vetter wrote: > On Wed, 31 Jul 2024 at 13:55, Sakari Ailus wrote: > > This is also very different from GPUs or accel devices that are built to be > > user-programmable. If I'd compare ISPs to different devices, then the > > closest match would probably be video codecs -- which also use V4L2. > > Really just aside, but I figured I should correct this. DRM supports > plenty of video codecs. They're all tied to gpus, but the real reason > really is that the hw has decent command submission support so that > running the entire codec in userspace except the basic memory and > batch execution and synchronization handling in the kernel is a > feasible design. And actually good, because your kernel wont ever blow > up trying to parse complex media formats because it just doesn't. I don't think V4L2 codecs parse the bitstream in the kernel either, at least not the recent ones. -- Regards, Laurent Pinchart
