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> -- balbi
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