From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Adam Ford <aford173@gmail.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>, Vignesh R <vigneshr@ti.com>,
Douglas Anderson <dianders@chromium.org>,
Tony Lindgren <tony@atomide.com>,
Yegor Yefremov <yegorslists@googlemail.com>,
linux-serial@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Serial 8250 DMA Broken on OMAP3630
Date: Mon, 7 Oct 2019 11:17:26 +0300 [thread overview]
Message-ID: <20191007081726.GK32742@smile.fi.intel.com> (raw)
In-Reply-To: <CAHCN7x+oXNA6WRiq1OnDdcgDTJrm-QyazyYLw-ow0vPMMmrVbQ@mail.gmail.com>
On Sun, Oct 06, 2019 at 12:04:47PM -0500, Adam Ford wrote:
I think the best one who may shed a light is bigeasy@ (Cc'ed).
> Has anyone else had any issues using the CONFIG_SERIAL_8250_DMA on the OMAP?
>
> I can use the DMA on the legacy, omap-serial driver, but when I enable
> the DMA on the 8250-omap driver, I get missing frames in Bluetooth.
>
> The older driver seems to have an ISR that seems to address a variety
> of items compared to the very tiny ISR for 8250-omap.c.
>
> I am not exactly sure where to start, but if someone has any
> suggestions on how I can troubleshoot, please let me know. As of now,
> I have to disable CONFIG_SERIAL_8250_DMA to get the Bluetooth
> connected to UART2 operational on a DM3730 at 3,000,000 baud, but it
> appears to work just fine after some patches I just submitted for
> handling RTS/CTS. The legacy omap-serial driver works fine with DMA.
>
> adam
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2019-10-07 8:17 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-06 17:04 Serial 8250 DMA Broken on OMAP3630 Adam Ford
2019-10-06 17:04 ` Adam Ford
2019-10-07 8:17 ` Andy Shevchenko [this message]
2019-10-07 8:17 ` Andy Shevchenko
2019-10-09 13:43 ` Vignesh Raghavendra
2019-10-09 13:43 ` Vignesh Raghavendra
2019-10-09 14:08 ` Adam Ford
2019-10-09 14:08 ` Adam Ford
2019-10-09 17:34 ` Tony Lindgren
2019-10-09 17:34 ` Tony Lindgren
2019-10-09 19:27 ` Adam Ford
2019-10-09 19:27 ` Adam Ford
2019-10-09 20:16 ` Tony Lindgren
2019-10-09 20:16 ` Tony Lindgren
2019-10-10 14:11 ` Adam Ford
2019-10-10 14:11 ` Adam Ford
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