Re: [PATCH 09/16] tty: serial: 8250_dma: Add a TX trigger workaround for AM33xx
From: Frans Klaver
Date: Mon Sep 29 2014 - 06:30:54 EST
On Mon, Sep 29, 2014 at 11:54:40AM +0200, Sebastian Andrzej Siewior wrote:
> There is a patch named "ARM: edma: unconditionally ack the error
> interrupt". I have the feeling that this is not really required once we
> delay set_termios. I couldn't reproduce the bug with beagleblack with my
> usual test case.
I think so too. I didn't need it either.
> For your "too much work for irq" problem: Could you add trace_printk()
> in tx/rx dma start/complete, and irq routine? The interresting part is
> what is the irq routine doing once entered. It might be a condition that
> is ignored at first and "acked" later while serving another event. Or it
> is really doing something and this is more or less "legal".
I'll have a look at that.
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