[Acked] [SRU] [B/C/D/Unstable/OEM-B] [PATCH 0/1] Workaround CSS timeout on AMD SNPS 3.0 xHC

[Andy Whitcroft]

On Wed, Dec 05, 2018 at 04:32:50PM +0800, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1806838
> 
> [Impact]
> Raven Ridge xHC may fail to suspend, causes the USB stops working, and
> blocks the system entering system-wide suspend.
> 
> [Fix]
> It's a hardware/firmware bug, workarounded by bailing out suspend
> function if it ever fails, and reset the xHC in next resume function.
> 
> [Test]
> After applying the patch, the USB works, and the system can enter S3
> consecutively.
> 
> [Regression Potential]
> Minimal. This workaround only applies to AMD Raven Ridge xHC.
> 
> Sandeep Singh (1):
>   xhci: workaround CSS timeout on AMD SNPS 3.0 xHC
> 
>  drivers/usb/host/xhci-pci.c |  4 ++++
>  drivers/usb/host/xhci.c     | 26 ++++++++++++++++++++++----
>  drivers/usb/host/xhci.h     |  3 +++
>  3 files changed, 29 insertions(+), 4 deletions(-)

Acked-by: Andy Whitcroft <apw at canonical.com>

-apw