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It turns out that local alpha value of the secondary input is set to 0xFF by the hardware if the secondary input is from scaler(hscaler or vscaler). This makes the layer on this secondary input accidentally cover the layer with higher z-order(if it exists), even though the layer with lower z-order doesn't supply local alpha. This patch zeros the secondary local alpha value to prevent the issue from happening. Users are unlikely to expect local alpha to be correctly scaled, so it looks fine to simply zero the alpha. If we find the unlikely case, the KMS driver may later explicitly do atomic check to invalidate the case. Signed-off-by: Liu Ying <victor.liu@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.