5e290226b1
We need to define a common list of format modifiers supported by each of the Mali display processors. The following are the constraints with AFBC:- 1. AFBC is not supported for the formats defined in malidp_hw_format_is_linear_only() 2. Some of the formats are supported only with AFBC modifiers. Thus we have introduced a new function 'malidp_hw_format_is_afbc_only()' which verifies the same. 3. AFBC_FORMAT_MOD_YTR needs to be provided for any RGB format. 4. Formats <= 16bpp cannot support AFBC_FORMAT_MOD_SPLIT. 5. CBR should not be set for non-subsampled formats. 6. SMART layer does not support framebuffer with AFBC modifiers. Return -EINVAL for such a scenario. 7. AFBC_FORMAT_MOD_YTR is not supported for any YUV formats. 8. Formats which are subsampled cannot support AFBC_FORMAT_MOD_SPLIT. However in DP550, YUV_420_10BIT is supported with AFBC_FORMAT_MOD_SPLIT. This feature has been identified with MALIDP_DEVICE_AFBC_YUV_420_10_SUPPORT_SPLIT. 9. In DP550 and DP650, for YUYV, the hardware supports different format-ids to be used with and without AFBC modifier. We have used the feature 'MALIDP_DEVICE_AFBC_YUYV_USE_422_P2' to identify this characteristic. 10. DP500 does not support split mode (ie AFBC_FORMAT_MOD_SPLIT). We have used the feature 'MALIDP_DEVICE_AFBC_SUPPORT_SPLIT' to identify the DPs which support SPLIT mode. 11. DP550 supports YUV420 with split mode. We have defined the feature 'AFBC_SUPPORT_SPLIT_WITH_YUV_420_10' to identify this characteristic. Changes since v1:- - Merged https://patchwork.freedesktop.org/patch/265215/ into this patch - As Liviu pointed out in the last patch, we can pull the checks outside of the 'while (*modifiers != DRM_FORMAT_MOD_INVALID)' loop - Rebased Changes since v3 (series): - Added the ack - Rebased on the latest drm-misc-next Signed-off-by: Ayan Kumar halder <ayan.halder@arm.com> Reviewed-by: Liviu Dudau <liviu.dudau@arm.com> Acked-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Link: https://patchwork.freedesktop.org/patch/291762/?series=57895&rev=1
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.