usb:xhci:Add quirk for Certain failing HP keyboard on reset after resume
authorSandeep Singh <sandeep.singh@amd.com>
Fri, 4 Aug 2017 11:05:56 +0000 (16:35 +0530)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 10 Aug 2017 18:50:53 +0000 (11:50 -0700)
commite788787ef4f9c24aafefc480a8da5f92b914e5e6
tree478a00444d1f01f7e0b669db35a0293dfca10293
parent8cc34c8d6113bef00a3a6d59ee101145cc350d61
usb:xhci:Add quirk for Certain failing HP keyboard on reset after resume

Certain HP keyboards would keep inputting a character automatically which
is the wake-up key after S3 resume

On some AMD platforms USB host fails to respond (by holding resume-K) to
USB device (an HP keyboard) resume request within 1ms (TURSM) and ensures
that resume is signaled for at least 20 ms (TDRSMDN), which is defined in
USB 2.0 spec. The result is that the keyboard is out of function.

In SNPS USB design, the host responds to the resume request only after
system gets back to S0 and the host gets to functional after the internal
HW restore operation that is more than 1 second after the initial resume
request from the USB device.

As a workaround for specific keyboard ID(HP Keyboards), applying port reset
after resume when the keyboard is plugged in.

Signed-off-by: Sandeep Singh <Sandeep.Singh@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
cc: Nehal Shah <Nehal-bakulchandra.Shah@amd.com>
Reviewed-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/core/quirks.c
drivers/usb/host/pci-quirks.c