linux-kernel - Re: regression: 3a878c430fd6 ("tty: serial: msm: Add TX DMA support") drops data

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Date:	Sat, 23 Apr 2016 10:24:00 -0700
From:	Frank Rowand <frowand.list@...il.com>
To:	Ivan Ivanov <iivanov.xz@...il.com>
CC:	Andy Shevchenko <andy.shevchenko@...il.com>,
	Peter Hurley <peter@...leysoftware.com>,
	"Krogerus, Heikki" <heikki.krogerus@...ux.intel.com>,
	Andy Gross <agross@...eaurora.org>,
	David Brown <davidb@...eaurora.org>,
	srinivas.kandagatla@...aro.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>
Subject: Re: regression: 3a878c430fd6 ("tty: serial: msm: Add TX DMA support")
 drops data

On 4/21/2016 1:42 PM, Andy Shevchenko wrote:
> On Thu, Apr 21, 2016 at 4:00 AM, Frank Rowand <frowand.list@...il.com> wrote:
>> On 4/20/2016 9:48 AM, Frank Rowand wrote:

< snip >

>> I'm not sure if the driver was in DMA or PIO mode, both
>> before the change and after.  This seems like a rather
>> important question to answer, so I'll try to verify
>> that tonight.

I was in PIO mode.

I found the problem and submitted a fix.

   [PATCH 0/2] tty: serial: msm_serial regression and add info message
   [PATCH 1/2] tty: serial: msm_serial regression fix data corruption
   [PATCH 2/2] tty: serial: msm_serial add info message


< snip >

-Frank