Re: [RFC] drm/fourcc: Add a modifier for contiguous memory

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On 11/29/22 18:18, Simon Ser wrote:
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Format modifiers are for the buffer layout only, not for the allocation
parameters, placement, etc. See the doc comment at the top of
drm_fourcc.h.
In the v4l2 mail list, we have such proposal that dropping the pixel formats(not the codec formats) from v4l2 header completely, as the growing of tile pixel formats. But we can't get rid of those variants about non-contiguous(the same value FOURCC in v4l2 are all for the contiguous memory).

Before I solve this problem, I believe the support for tile formats in v4l2 would never be stable.

The most common way here is to hack the pixel format modifier, then userspace library could be aware this in allocation and get properties of the drm_planes.

Or another way, we could add a common plane property, indicated that whether the driver requests contiguous memory plane for a format?
--
Hsia-Jun(Randy) Li



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