mainlining shenanigans
d1001ab410
EINT(Event Interrupt) is a write-1-to-clear type of bit in xhci status register. It should be cleared by writing a 1. Writing 0 to this bit has no effect. Xhci driver tries to clear this bit by writing 0 to it. This is not the right way to go. This patch corrects this by reading the register first, then clearing all RO/RW1C/RsvZ bits and setting the clearing bit, and writing back the new value at last. Xhci spec requires that software that uses EINT shall clear it prior to clearing any IP flags in section 5.4.2. This is the reason why this patch is CC'ed stable as well. [old way didn't cause any issues, skip stable, send to next -Mathias] Cc: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.