On Sat, 06 Mar 2021 10:56:49 +0000 Simon Ser <[email protected]> wrote:
> On Friday, March 5th, 2021 at 9:28 AM, Pekka Paalanen <[email protected]> > wrote: > > > > +/** > > > + * DRM_CAP_DUMB_PREFERRED_DEPTH > > > + * > > > + * The preferred depth (in bits) for dumb buffers. > > > > this is literally depth, not bits per pixel, right? > > "Depth" is pretty ambiguous [1]. Maybe we should be more explicit here and say > that it's the number of bits used to indicate the color of a single pixel? And > maybe add a note that it's different from bits per pixel? Yes, indeed. I was already assuming the meaning of "depth" in drmModeAddFB(). > [1]: https://en.wikipedia.org/wiki/Color_depth > > > > +/** > > > + * DRM_CAP_PRIME > > > + * > > > + * Bitfield of supported PRIME sharing capabilities. See > > > &DRM_PRIME_CAP_IMPORT > > > + * and &DRM_PRIME_CAP_EXPORT. > > > + */ > > > #define DRM_CAP_PRIME 0x5 > > > +/** > > > + * DRM_PRIME_CAP_IMPORT > > > + * > > > + * If this bit is set in &DRM_CAP_PRIME, the driver supports importing > > > PRIME > > > + * buffers. > > > > What are PRIME buffers? > > Will add something like: > > PRIME buffers are exposed as dma-buf file descriptors. See > Documentation/gpu/drm-mm.rst, section "PRIME Buffer Sharing". Sounds good. > > > + */ > > > #define DRM_PRIME_CAP_IMPORT 0x1 > > > +/** > > > + * DRM_PRIME_CAP_EXPORT > > > + * > > > + * If this bit is set in &DRM_CAP_PRIME, the driver supports exporting > > > PRIME > > > + * buffers. > > > > What's the export API? HandleToFD()? > > Yes. Will add a note about it. Same for import. Cool. > > > +/** > > > + * DRM_CAP_CRTC_IN_VBLANK_EVENT > > > + * > > > + * If set to 1, the kernel supports reporting the CRTC ID in > > > + * &drm_event_vblank.crtc_id. > > > > Does this not apply also to the pageflip / atomic completion event? > > Both DRM_EVENT_VBLANK and DRM_EVENT_FLIP_COMPLETE use the struct > drm_event_vblank, so yes. I'll mention these two events explicitly. They do? Seems like I have been spoiled by the libdrm API that uses drmEventContext with different callbacks for these things. Thanks, pq
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