linux-kernel - Re: [PATCH] tty: serial: 8250_omap: do not defer termios changes

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Message-ID: <87y48kftip.fsf@linutronix.de>
Date:	Mon, 11 Apr 2016 10:18:22 +0200
From:	John Ogness <john.ogness@...utronix.de>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tony Lindgren <tony@...mide.com>, nsekhar@...com,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH] tty: serial: 8250_omap: do not defer termios changes

On 2016-04-05, Peter Hurley <peter@...leysoftware.com> wrote:
> On 03/31/2016 01:41 AM, John Ogness wrote:
>> It has been observed that the TX-DMA can stall
>
> Does this happen on any other OMAP part besides am335x?
> I looked back over the LKML history of this and didn't see
> any other design implicated in this problem.

I just ran the tests again using 4.6-rc2. I am able to reproduce the
dma-tx stall with am335x/edma and dra7/sdma.

Note: To achieve the stall, both the delayed_restore and the
      rx_dma_broken features of the mainline 8250_omap driver needed to
      be removed.

John Ogness