summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/setup_32.c
diff options
context:
space:
mode:
authorSarah Sharp <sarah.a.sharp@linux.intel.com>2010-10-26 16:47:13 -0700
committerSarah Sharp <sarah.a.sharp@linux.intel.com>2010-11-19 16:23:18 -0800
commitda6699ce4a889c3795624ccdcfe7181cc89f18e8 (patch)
tree05cd63ceb04825bda66d11175108b3b5510b1fe6 /arch/sparc/kernel/setup_32.c
parent7a3783efffc7bc2e702d774e47fad5b8e37e9ad1 (diff)
xhci: Setup array of USB 2.0 and USB 3.0 ports.
An xHCI host controller contains USB 2.0 and USB 3.0 ports, which can occur in any order in the PORTSC registers. We cannot read the port speed bits in the PORTSC registers at init time to determine the port speed, since those bits are only valid when a USB device is plugged into the port. Instead, we read the "Supported Protocol Capability" registers in the xHC Extended Capabilities space. Those describe the protocol, port offset in the PORTSC registers, and port count. We use those registers to create two arrays of pointers to the PORTSC registers, one for USB 3.0 ports, and another for USB 2.0 ports. A third array keeps track of the port protocol major revision, and is indexed with the internal xHCI port number. This commit is a bit big, but it should be queued for stable because the "Don't let the USB core disable SuperSpeed ports" patch depends on it. There is no other way to determine which ports are SuperSpeed ports without this patch. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Tested-by: Don Zickus <dzickus@redhat.com> Cc: stable@kernel.org
Diffstat (limited to 'arch/sparc/kernel/setup_32.c')
0 files changed, 0 insertions, 0 deletions