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Two mask registers are used in order to select which events have to actually generate an interrupt on each IRQ line. It seems that in the single-IRQ case it's assumed that the IRQs lines are simply OR-ed, while the two mask registers are still present. The driver still programs the two mask registers separately. However the STM32 variant has only one IRQ, and also has only one mask register. This patch prepares for STM32 variant support by making the driver using only one mask register. This patch also optimize the MMCIMASK1 mask usage by caching it into host->mask1_reg which avoid to read it into mmci_irq(). Tested only on STM32 variant. RFT for variants other than STM32 Signed-off-by: Andrea Merello <andrea.merello@gmail.com> Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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.