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First of all, fbtft in current state doesn't allow to override GPIOs to be optional, like "reset" one. It might be a bug somewhere, but rather out of scope of this fix. Second, not all GPIOs available on the board would be SoC based, some of them might sit on I2C GPIO expanders, for example, on Intel Edison/Arduino, and thus any communication with them might sleep. Besides that using udelay() and mdelay() is kinda resource wasteful. Summarize all of the above, convert fbtft_reset() function to non-atomic variant by using gpio_set_value_cansleep(), usleep_range(), and msleep(). Reviewed-by: Noralf Trønnes <noralf@tronnes.org> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.