[v2] xhci: Fix front USB ports on ASUS PRIME B350M-A

[Mathias Nyman <mathias.nyman@linux.intel.com>]

Hi

On 19.02.2018 21:06, Kai-Heng Feng wrote:
> When a USB device gets plugged on ASUS PRIME B350M-A's front ports, the
> xHC stops working:
> [  549.114587] xhci_hcd 0000:02:00.0: WARN: xHC CMD_RUN timeout
> [  549.114608] suspend_common(): xhci_pci_suspend+0x0/0xc0 returns -110
> [  549.114638] xhci_hcd 0000:02:00.0: can't suspend (hcd_pci_runtime_suspend returned -110)

Is the xhci runtime suspend something that you expected here?
I mean was the plugged device first enumerated normally, driver bound, inactive and runtime suspended
first?

> 
> Delay before running xHC command CMD_RUN can workaround the issue.
> 
> Use a new quirk to make the delay only targets to the affected xHC.

Is this some known issue with this chip, or something figured out by trial and error?

> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>

Thanks, otherwise workaround seems fine, just curious about the two details above

-Mathias
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