linux-kernel - Re: [PATCH v5 3/3] USB: serial: cp210x: Workaround cp2108 GET_LINE

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Message-ID: <20151116114043.GA6627@localhost>
Date:	Mon, 16 Nov 2015 12:40:43 +0100
From:	Johan Hovold <johan@...nel.org>
To:	Konstantin Shkolnyy <konstantin.shkolnyy@...il.com>
Cc:	johan@...nel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 3/3] USB: serial: cp210x: Workaround cp2108
 GET_LINE_CTL bug

On Wed, Oct 28, 2015 at 04:02:54PM -0500, Konstantin Shkolnyy wrote:
> cp2108 GET_LINE_CTL returns the 16-bit value with the 2 bytes swapped.
> However, SET_LINE_CTL functions properly. When the driver tries to modify
> the register, it reads it, modifies some bits and writes back. Because the
> read bytes were swapped, this often results in an invalid value to be
> written. In turn, this causes cp2108 respond with a stall. The stall
> sometimes doesn't clear properly and cp2108 starts responding to following
> valid commands also with stalls, effectively failing.
> 
> Signed-off-by: Konstantin Shkolnyy <konstantin.shkolnyy@...il.com>

All three now applied (with amended commit messages) for next.

Thanks,
Johan
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