>From: Mathias Nyman [mailto:mathias.nyman@xxxxxxxxxxxxxxx] >On 25.10.2016 13:45, Sriram Dash wrote: >> For the USB3.0 controller, USB 2.0 reset not driven while port is in >> Resume state. So, do not program the USB 2.0 reset >> (PORTSC[PR]=1) while in Resume state. >> >> Signed-off-by: Rajat Srivastava <rajat.srivastava@xxxxxxx> >> Signed-off-by: Sriram Dash <sriram.dash@xxxxxxx> >> Signed-off-by: Rajesh Bhagat <rajesh.bhagat@xxxxxxx> >> --- > >What is the actual issue that you are fixing here? This was an erratum from Synopsis STAR: 9000962562 >Is there some device that is in resume (PLS==XDEV_RESUME) while driving reset? > We have not reproduced this as such. >I just sent a pach for increasing the resume time signaling to 40ms when clearing >the PORT_FEAT_SUSPEND. >Does that work for you? > >If not, then we should look closer at why clearing the suspend does not work >properly. >One issue could be that ClearPortFeature PORT_FEAT_SUSPEND does not really >read or wait for for changes in port status. It blindly sets the states based on time >passed. > >Or if it's after system suspend there might be something in bus_resume that is not >working. > >I don't think usb core tries to drive reset while port is still resuming > I am skeptical about it and hope somebody may help us on this. >-Mathias > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
