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EXYNOS_IOMMU is disabled in exynos_defconfig since it was known to cause boot failures on Exynos Chromebooks. The recommendation was for IOMMU to be enabled manually on systems as needed. A recent exynos_drm change added a warning message when EXYNOS_IOMMU is disabled. It is necessary to enable it to avoid the warning messages. A few initial tests have shown that enabling EXYNOS_IOMMU might be safe on Exynos Chrome-books. Due to some other changes in the order of operations during boot process, power domains are initialized very early and because of the temporary lack of devices (which are not yet added to the system), are turned off. This practically stops FIMD for scanning framebuffer very early during boot, before IOMMU gets initialized and "solves" the issue, which was the reason to disable Exynos IOMMU by default on Exynos Snow Chromebooks. Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com> Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> [krzk: Extend message with Marek Szyprowski's explanation] Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> |
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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.