linux-kernel - Re: [PATCH 11/13] arm: dts: dra7: add DMA properties for UART

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Message-ID: <5459DBB7.1090702@linutronix.de>
Date:	Wed, 05 Nov 2014 09:11:35 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
CC:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	tony@...mide.com, balbi@...com, gregkh@...uxfoundation.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 11/13] arm: dts: dra7: add DMA properties for UART

On 11/05/2014 02:15 AM, Lennart Sorensen wrote:
> Well 4 hours running with multiple reboots (our testsuite reboots every
> 30 minutes to test the watchdog).  So far it has only lost 70 bytes out
> of 40MB of data sent between uart7 and uart8 (and we are pretty sure
> the serial test has a small bug that causes a few bytes to be lost right
> after a reboot sometimes).
> 
> The reason I am even trying the new driver today is that we were seeing
> soft lockups on the CPU whenever the serial ports were being tested,
> usually in less than 5 minutes, so 4 hours without a lockup is a good
> sign.  No idea what might be wrong with the old omap serial driver, but
> it seems something is (unless of course we managed to break it somehow
> when we tried to solve its habit of dropping characters).

Okay. No DMA but the basic part seems to work for you. Thanks for
testing.

Sebastian
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