ACK/cmnt: [SRU] [E/F/Unstable/OEM-OSP1-B] [PATCH 0/4] Make Dell WD19 dock more reliable after suspend

[Kleber Souza]

On 20.03.20 08:39, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1868217
> 
> [Impact]
> When Dell WD19 dock connects multiple USB3 storage devices, the USB Hub
> used internally may stop working after suspend.
> 
> [Fix]
> Disable LPM on the Realtek USB Hub, and let xHCI controller make sure
> the link state transition is completed.
> 
> [Test]
> After applying the patches, the Dell WD19 works reliably after thousand
> times for suspend/resume cycle.
> 
> [Regression Potential]
> Low. This replaces the currently "msleep" way with more robust
> mechanism. I also test other systems and nothing breaks.
> 
> Kai-Heng Feng (3):
>   xhci: Ensure link state is U3 after setting USB_SS_PORT_LS_U3
>   xhci: Wait until link state trainsits to U0 after setting
>     USB_SS_PORT_LS_U0
>   USB: Disable LPM on WD19's Realtek Hub
> 
> Mathias Nyman (1):
>   xhci: Finetune host initiated USB3 rootport link suspend and resume
> 
>  drivers/usb/core/quirks.c    |  3 ++
>  drivers/usb/host/xhci-hub.c  | 61 ++++++++++++++++++++++++++++++------
>  drivers/usb/host/xhci-mem.c  |  1 +
>  drivers/usb/host/xhci-ring.c |  1 +
>  drivers/usb/host/xhci.h      |  1 +
>  5 files changed, 57 insertions(+), 10 deletions(-)
> 

These patches have already been merged on Linus' tree, so the 'linux-next'
part on the provenance line can be removed.

Acked-by: Kleber Sacilotto de Souza <kleber.souza at canonical.com>