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.

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commit e61c38d85b7392e033ee03bca46f1d6006156175
Author: Uwe Kleine-König [off-list ref]
Date:   Tue Apr 4 11:18:51 2017 +0200

    serial: imx: setup DCEDTE early and ensure DCD and RI irqs to be off
 
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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/  |