linux-kernel - Re: [PATCH 09/16] tty: serial: 8250_dma: Add a TX trigger workaround for AM33xx

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Message-ID: <20140925151403.GH19396@linutronix.de>
Date:	Thu, 25 Sep 2014 17:14:03 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Frans Klaver <frans.klaver@...ns.com>
Cc:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Peter Hurley <peter@...leysoftware.com>, tony@...mide.com,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	balbi@...com, linux-serial@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH 09/16] tty: serial: 8250_dma: Add a TX trigger workaround
 for AM33xx

* Frans Klaver | 2014-09-22 11:28:54 [+0200]:

>I guess then we'd still have to answer the question why the yocto build
>calls set_termios() so often, but that's not on you then. Did you notice
>it even changing settings? We might want to fix this even if the kernel
>should be able to cope.

could you please test uart_v10_pre3? I dropped a few register sets and
delayed the register update until TX-DMA is complete. I am traveling
currently and have only my boneblack and it passes my limited testing.
If it solves your problems, too then I would address Heikki's latest
comments and prepare the final v10 (and I hope I didn't break beagle
board in between).

>Thanks again,
>Frans

Sebastian
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