ACK: [PATCH 0/1][F/H] Fix usb hub failure caused by short power-on-good delay

[Tim Gardner]

Acked-by: Tim Gardner <tim.gardner at canonical.com>

On 8/12/21 7:35 AM, Chris Chiu wrote:
> BugLink: https://bugs.launchpad.net/bugs/1939638
> 
> [Impact]
> The USB devices (keyboard, storage...) are failed to be detected when connecting to the problematic root hubs which need longer PowerOn-to-PowerGood delay than it claims in the hub descriptor. It's caused by the upstream fix 90d28fb53d4a ("usb: core: reduce power-on-good delay time of root hub").
> 
> [Fix]
> Reverting the upstream fix until a formal fix been placed.
> 
> [Test Case]
> 1. Plug the USB device to the ports of problematic root hub.
> 2. Power on the machine.
> 3. Check if the USB device can work or not after boot.
> 
> [Regression Potential]
> Low. The longer delay is proven safe in old kernels.
> 
> Chris Chiu (1):
>    Revert "usb: core: reduce power-on-good delay time of root hub"
> 
>   drivers/usb/core/hub.h | 6 ++----
>   1 file changed, 2 insertions(+), 4 deletions(-)
> 

-- 
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Tim Gardner
Canonical, Inc