linux-kernel - Re: [regression, bisected] 4.11+ imx uarts broken

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Message-ID: <20170509071435.kxt6pjlglzinf2w5@pengutronix.de>
Date:   Tue, 9 May 2017 09:14:35 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Mika Penttilä <mika.penttila@...tfour.com>
Cc:     linux-serial@...r.kernel.org, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org
Subject: Re: [regression, bisected] 4.11+ imx uarts broken

Hello Mika,

On Tue, May 09, 2017 at 07:18:09AM +0300, Mika Penttilä wrote:
> The following commit e61c38d85b7 makes the uarts on i.MX6 nonfunctional (no data transmitted or received). 
> With e61c38d85b7 reverted the uarts work ok.
> 
> -------------------
> commit e61c38d85b7392e033ee03bca46f1d6006156175
> Author: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Date:   Tue Apr 4 11:18:51 2017 +0200
> 
>     serial: imx: setup DCEDTE early and ensure DCD and RI irqs to be off
>  
> --------------------

are you operating the UART in DTE or DCE mode? Does this affect all
UARTs or only those that are not used in the bootloader?

Looking at the patch I wonder if setting IMX21_UCR3_RXDMUXSEL |
UCR3_ADNIMP is missing for you.

Can you please check which hunk of e61c38d85b73 is giving you problems?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |