From: Sascha Hauer <s.hauer@pengutronix.de>
To: Fabio Estevam <fabio.estevam@freescale.com>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH v2] serial: imx: Fix buggy transmissions when baudrate mismatches
Date: Tue, 3 Jun 2014 08:42:17 +0200 [thread overview]
Message-ID: <20140603064217.GA15686@pengutronix.de> (raw)
In-Reply-To: <1401717999-10752-1-git-send-email-fabio.estevam@freescale.com>
On Mon, Jun 02, 2014 at 11:06:39AM -0300, Fabio Estevam wrote:
> Bit 7 of UCR3 is described in the i.MX reference manuals (with the exception
> of i.MX1) as follows:
>
> ADNIMP: Autobaud Detection Not Improved-. Disables new features of
> autobaud detection (See Baud Rate Automatic Detection
> Protocol, for more details).
>
> 0 Autobaud detection new features selected
> 1 Keep old autobaud detection mechanism
>
> The "new features" mechanism occasionally causes the receiver to get out of sync
> and continuously produces received characters of '0xff'.
>
> In order to reproduce the problem:
>
> $ cs0.baudrate=19200
> - Change the terminal baudrate to 19200
> - Type in the console and it should look good
> - Change the terminal baudrate back to 115200
> - Type 'b' in the console, then a stream of '0xff' is transmitted in loop
>
> Setting the ADNIMP bit avoids the transmission of '0xff' in loop.
>
> Also rename the bit definition as per the reference manual.
>
> Tested on mx6q.
>
> Based on a patch from Eric Nelson for U-boot.
>
> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Applied, thanks
Sascha
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prev parent reply other threads:[~2014-06-03 6:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-02 14:06 Fabio Estevam
2014-06-03 6:42 ` Sascha Hauer [this message]
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