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This patch will allow userspace to rotate planes by setting the 'rotation' property. Generally, 0 and 180 rotations are allowed for pretty much all 8-bit xRGB and 2-plane YUV420 formats. 90/270 rotations can be performed only for non-compressed tiled GPU xRGB formats. Tiled YUV420 formats do not allow rotations at all because these formats need DTRC for de-tiling and DTRC has no rotation support. For more info, consult the DPR Features chapter in the reference manual. Test example: modetest -M imx-drm -w 27:rotation:4 -w 32:rotation:33 -w 27:alpha:30 -s 42@31:3840x2160-60@XR24 -P 32@31:3840x2160@NV21 The above will perform: * 180 degree rotation of primary plane (XR24); * vertical flip of first overlay plane (rotate-0 | reflect-y); * set primary plane alpha to 30; Signed-off-by: Laurentiu Palcu <laurentiu.palcu@nxp.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.