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From: Frank Rowand <frowand.list@gmail.com>
To: ivan.ivanov@linaro.org
Cc: agross@codeaurora.org, David Brown <davidb@codeaurora.org>,
	srinivas.kandagatla@linaro.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	jslaby@suse.com, Rob Herring <robh+dt@kernel.org>,
	Pawel Moll <pawel.moll@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	Linux Kernel list <linux-kernel@vger.kernel.org>,
	"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>,
	linux-soc@vger.kernel.org, linux-serial@vger.kernel.org
Subject: regression: 3a878c430fd6 ("tty: serial: msm: Add TX DMA support") drops data
Date: Tue, 19 Apr 2016 16:23:29 -0700	[thread overview]
Message-ID: <5716BDF1.1010407@gmail.com> (raw)

Hi Ivan,

It appears that I have found a regression caused by
3a878c430fd6 ("tty: serial: msm: Add TX DMA support").

When I cat a file slightly larger than 126000 bytes on
the console, viewed via minicom connected to the serial
port, I am losing random chunks of data, almost always
three bytes in length.  I have also seen a lost chunk
of two bytes.

I am using the 8074 dragonboard, with the dts of
arch/arm/boot/dts/qcom-apq8074-dragonboard.dts.
The dts node is serial@f991e000, which has a
compatible of "qcom,msm-uartdm-v1.4", so is_uartdm
should be UARTDM_1P4.

Do you have any thoughts on what might be going
wrong, or what I can do to debug this?

Thanks,

Frank

             reply	other threads:[~2016-04-19 23:23 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-19 23:23 Frank Rowand [this message]
2016-04-20  6:07 ` regression: 3a878c430fd6 ("tty: serial: msm: Add TX DMA support") drops data Ivan Ivanov
2016-04-20  6:07   ` Ivan Ivanov
     [not found]   ` <EEBBF78A-33BB-4ACD-8CBF-285E1149FB9F-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-04-20 16:48     ` Frank Rowand
2016-04-20 16:48       ` Frank Rowand
2016-04-21  1:00       ` Frank Rowand
2016-04-21 20:42         ` Andy Shevchenko
2016-04-23 17:24           ` Frank Rowand

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