Hi, Sandeep Singh <ssingh1@xxxxxxx> writes: > On 8/4/2017 4:44 PM, Felipe Balbi wrote: >> >> Hi, >> >> Sandeep Singh <Sandeep.Singh@xxxxxxx> writes: >>> From: Sandeep Singh <sandeep.singh@xxxxxxx> >>> >>> 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@xxxxxxx> >>> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx> >>> cc: Nehal Shah <Nehal-bakulchandra.Shah@xxxxxxx> >> >> seems correct now: >> >> Reviewed-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx> >> > > Greg, Any feedback on this patch.? Mathias is the xHCI maintainer. He just came back from vacations, give him some time ;-) -- balbi
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