Re: [PATCH v3] xhci: workaround CSS timeout on AMD SNPS 3.0 xHC

[Mathias Nyman]

On 27.11.2018 09:44, Kai Heng Feng wrote:
> > On Nov 24, 2018, at 00:24, Singh, Sandeep <sandeep.singh@xxxxxxx> wrote:
> >
> > From: Sandeep Singh <sandeep.singh@xxxxxxx>
> >
> > Occasionally AMD SNPS 3.0 xHC does not respond to
> > CSS when set, also it does not flag anything on SRE and HCE
> > to point the internal xHC errors on USBSTS register. This stalls
> > the entire system wide suspend and there is no point in stalling
> > just because of xHC CSS is not responding.
> >
> > To work around this problem, if the xHC does not flag
> > anything on SRE and HCE, we can skip the CSS
> > timeout and allow the system to continue the suspend. Once the
> > system resume happens we can internally reset the controller
> > using XHCI_RESET_ON_RESUME quirk
> >
> > Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>
> > Signed-off-by: Sandeep Singh <Sandeep.Singh@xxxxxxx>
> > cc: Nehal Shah <Nehal-bakulchandra.Shah@xxxxxxx>
>
> Tested-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>

Thanks, applying

-Mathias