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On Gen2 hardware the VSP1 is a bus master and accesses the display list and video buffers through DMA directly. On Gen3 hardware, however, memory accesses go through a separate IP core called FCP. The VSP1 driver unconditionally maps DMA buffers through the VSP device. While this doesn't cause any practical issue so far, DMA mappings will be incorrect as soon as we will enable IOMMU support for the FCP on Gen3 platforms, resulting in IOMMU faults. Fix this by mapping all buffers through the FCP device if present, and through the VSP1 device as usual otherwise. Suggested-by: Magnus Damm <magnus.damm@gmail.com> [Cache the bus master device] Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> Acked-by: Mauro Cavalho Chehab <mchehab@s-opensource.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.