Hi Hsia-Jun, On Tue, Aug 09, 2022 at 12:27:48AM +0800, Hsia-Jun Li wrote: > From: "Hsia-Jun(Randy) Li" <randy.li@xxxxxxxxxxxxx> > > Those pixel formats are used in Synaptics's VideoSmart series SoCs, > likes VS640, VS680. I just disclose the pixel formats used in the video > codecs and display pipeline this time. Actually any device with a MTR > module could support those tiled and compressed pixel formats. The more > detail about MTR module could be found in the first patch of this serial > of mail. > > We may not be able to post any drivers here in a short time, the most of > work in this platform is done in the Trusted Execution Environment and > we didn't use the optee framework. Is that so for the display side too, or only for the video decoder ? > Please notice that, the memory planes used for video codecs would be 5 > when the compression is invoked while it would be 4 for display, the > extra planes in the video codecs is for the decoding internally usage, > it can't append the luma or chroma buffer as many other drivers do, > because this buffer could be only accessed by the video codecs itself, > it requests a different memory security attributes. Any other reason is > described in the v4l pixel formats's patch. I don't know whether a > different numbers of memory planes between drm and v4l2 is acceptable. I don't think that's a problem as such, as long as both the V4L2 and DRM formats make sense on their own. > I only posted the compression fourcc for the v4l2, because it is really > hard to put the uncompression version of pixel formats under the fourcc. > I would be better that we could have something likes format modifers in > drm here. Agreed, we need modifiers support in V4L2. This has been discussed previously ([1]), and a proposal ([2]) has been submitted two years ago, it needs to be revived. [1] https://lore.kernel.org/linux-media/20170821155203.GB38943@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ [2] https://lore.kernel.org/linux-media/20200804192939.2251988-1-helen.koike@xxxxxxxxxxxxx/ > https://synaptics.com/products/multimedia-solutions > > Hsia-Jun(Randy) Li (2): > drm/fourcc: Add Synaptics VideoSmart tiled modifiers > [WIP]: media: Add Synaptics compressed tiled format > > drivers/media/v4l2-core/v4l2-common.c | 1 + > drivers/media/v4l2-core/v4l2-ioctl.c | 2 ++ > include/uapi/drm/drm_fourcc.h | 49 +++++++++++++++++++++++++++ > include/uapi/linux/videodev2.h | 2 ++ > 4 files changed, 54 insertions(+) -- Regards, Laurent Pinchart
