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>
Wed, 16 Aug 2017 20:43:22 +0000 (13:43 -0700)
commit4cae4a23d9a4d2e0515d22590c23147809f7ea8e
treec703075cd61066c1b977f502aaa3cde0447183d3
parentf4bbed570aef42ccd08852b05ace99d488ed3ddf
usb:xhci:Add quirk for Certain failing HP keyboard on reset after resume

commit e788787ef4f9c24aafefc480a8da5f92b914e5e6 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/core/quirks.c
drivers/usb/host/pci-quirks.c