linux-kernel - Re: [PATCH v2] xhci: Convert xhci_handshake() to use readl_poll_timeout

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Message-ID: <c102196e-1250-307f-0b2e-d76c62a161a0@linux.intel.com>
Date:   Thu, 2 May 2019 15:17:17 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Raul Rangel <rrangel@...omium.org>,
        Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     linux-usb@...r.kernel.org, Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] xhci: Convert xhci_handshake() to use
 readl_poll_timeout_atomic()

On 29.4.2019 23.05, Raul Rangel wrote:
> On Thu, Feb 07, 2019 at 05:48:16PM -0800, Andrey Smirnov wrote:
>> Xhci_handshake() implements the algorithm already captured by
>> readl_poll_timeout_atomic(). Convert the former to use the latter to
>> avoid repetition.
>>
>> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Tested-by: Raul E Rangel <rrangel@...omium.org>
> Reviewed-by: Raul E Rangel <rrangel@...omium.org>
> 
> This fixes a bug on the AMD Stoneyridge platform. usleep(1) sometimes
> takes over 10ms. This means a 5 second timeout can easily take over 15
> seconds which will trigger the watchdog and reboot the system.
> 
> Thanks for the patch.

Adding to queue

-Mathias