linux-kernel - mxs-auart broken in v6.2 and onwards

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Date: Sat, 27 Jan 2024 21:35:15 +0000
From: Emil Kronborg <emil.kronborg@...tonmail.com>
To: linux-serial@...r.kernel.org, jirislaby@...nel.org
Cc: linux-kernel@...r.kernel.org
Subject: mxs-auart broken in v6.2 and onwards

Hi,

After updating Linux on an i.MX28 board, serial communication over AUART
broke. When I TX from the board and measure on the TX pin, it seems like
the HW fifo is not emptied before the transmission is stopped. I
bisected the bad commit to be 2d141e683e9a ("tty: serial: use
uart_port_tx() helper"). Since it concerns multiple drivers, simply
reverting it is not feasible. One solution would be to effectively
revert the commit for just mxs-auart.c, but maybe you have a better
idea? Any pointers is appreciated.

Regards,
Emil