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

Seth Forshee seth.forshee at
Wed Dec 5 14:56:19 UTC 2018

On Wed, Dec 05, 2018 at 04:32:50PM +0800, Kai-Heng Feng wrote:
> BugLink:
> [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.

Cherry picks from upstream and maintainer tree, limited scope.

Acked-by: Seth Forshee <seth.forshee at>

Applied to disco/master-next, thanks!

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