[SRU] [B/D/E/Unstable/OEM-B/OEM-OSP1-B] [PATCH 0/2] Fix unusable USB hub on Dell TB16 after S3

[Kleber Souza]

On 2019-12-05 18:05, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1855312
> 
> [Impact]
> Sometimes USB hub on Dell TB16 stop working after S3.
> 
> [Fix]
> Attempt to power cycle USB device when a it's stuck at eSS.Disabled
> state, it's basically not recoverable. 
> 
> [Test]
> After applying the patch, USB ports and USB ethernet are still working
> after 100 times S3 stress test.
> 
> [Regression Potential]
> Low. This is a last resort attempt, in most cases this code path won't
> be reached.
> 
> Kai-Heng Feng (2):
>   UBUNTU: SAUCE: USB: core: Make port power cycle a seperate helper
>     function
>   UBUNTU: SAUCE: USB: core: Attempt power cycle port when it's in
>     eSS.Disabled state
> 
>  drivers/usb/core/hub.c  | 46 +++++++++++++++++++++++++++++++++++------
>  drivers/usb/core/hub.h  |  3 +--
>  drivers/usb/core/port.c |  4 ++--
>  3 files changed, 43 insertions(+), 10 deletions(-)
> 

Hi Kai-Heng,

The fix is targeted to Unstable so I assume this affects mainline as
well. Are we going to try to upstream this fix?


Thanks,
Kleber