linux-kernel - Re: [PATCH] xhci: Increase STS_SAVE timeout in xhci

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Message-ID: <ea4f345f-994b-7913-d445-3c64b8d3cd6f@linux.intel.com>
Date:   Fri, 27 Sep 2019 09:30:20 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        mathias.nyman@...el.com, gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xhci: Increase STS_SAVE timeout in xhci_suspend()

On 26.9.2019 20.57, Kai-Heng Feng wrote:
> After commit f7fac17ca925 ("xhci: Convert xhci_handshake() to use
> readl_poll_timeout_atomic()"), ASMedia xHCI may fail to suspend.
> 
> Although the algorithms are essentially the same, the old max timeout is
> (usec + usec * time of doing readl()), and the new max timeout is just
> usec, which is much less than the old one.
> 
> Increase the timeout to make ASMedia xHCI able to suspend again.
> 
> BugLink: https://bugs.launchpad.net/bugs/1844021
> Fixes: f7fac17ca925 ("xhci: Convert xhci_handshake() to use readl_poll_timeout_atomic()")
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---

Thanks, adding to queue with stable tag for v5.2+ kernels

-Mathias