From: Tony Lindgren <tony@atomide.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: balbi@ti.com, linux-serial@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Vinod Koul <vinod.koul@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Paul Walmsley <paul@pwsan.com>
Subject: Re: [PATCH 15/15] tty: serial: 8250: omap: add dma support
Date: Fri, 29 Aug 2014 09:12:22 -0700 [thread overview]
Message-ID: <20140829161221.GO16006@atomide.com> (raw)
In-Reply-To: <540048B4.7010807@linutronix.de>
* Sebastian Andrzej Siewior <bigeasy@linutronix.de> [140829 02:32]:
> On 08/29/2014 12:54 AM, Tony Lindgren wrote:
> > OK thanks, I'm seeing the same issue as you. And the idlest registers
> > don't show any blockers. Looking at the errata docs, seems like
> > "Usage Note 2.7" in sprz318f.pdf says:
> >
> > Details When configured for DMA operations using smartidle mode (SYSC[4:3].IDLEMODE =
> > 0x2), the UART module will not acknowledge incoming idle requests. As a consequence,
> > it can prevent L4 from going to idle.
> > When there are additional expected transfers, the UART should be placed in force-idle
> > mode.
>
> Ehm. So I haven't found an errata document for omap3630, there is
> nothing like that in that one I have for am335x or dra7. The document
> you mentioned is for AM3715. Interesting…
Yes I would not be suprised if that same bug is in all of them though..
> > So I've added also Paul to Cc, he may have better suggestions for the
> > hwmod flags to use. The experimental patch below seems to allow idling
> > for me, care to give it a try?
>
> Yep, this one works. And I see DMA transfers (for RX side) after the
> core hit idle so it seems to look good :)
OK great :)
Looks like the paste bug is there for sure, doing off idle and pasting
240 characters to the console can hang the UART RX after few attempts,
and pasting 16 charactes won't show up at all if the system is idling.
So you may want to play with that too a bit :)
Regards,
Tony
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next prev parent reply other threads:[~2014-08-29 16:12 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-15 17:42 [PATCH v7] 8250-core based serial driver for OMAP + DMA Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 01/15] tty: serial: 8250_core: allow to overwrite & export serial8250_startup() Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 02/15] tty: serial: 8250_core: allow to set ->throttle / ->unthrottle callbacks Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 03/15] tty: serial: 8250_core: add run time pm Sebastian Andrzej Siewior
2014-08-20 9:23 ` Frans Klaver
2014-08-20 9:39 ` Frans Klaver
2014-09-01 14:48 ` Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 04/15] tty: serial: 8250_core: read only RX if there is something in the FIFO Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 05/15] tty: serial: Add 8250-core based omap driver Sebastian Andrzej Siewior
2014-08-15 18:37 ` Lennart Sorensen
2014-08-15 19:27 ` Sebastian Andrzej Siewior
2014-08-15 19:33 ` Lennart Sorensen
2014-08-15 20:20 ` Sebastian Andrzej Siewior
2014-08-15 21:07 ` Tony Lindgren
2014-08-15 22:44 ` Tony Lindgren
2014-08-29 15:49 ` Sebastian Andrzej Siewior
2014-08-29 16:08 ` Tony Lindgren
2014-08-21 11:00 ` Sebastian Andrzej Siewior
2014-08-21 18:38 ` Tony Lindgren
2014-08-18 13:46 ` Heikki Krogerus
2014-09-01 13:31 ` Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 06/15] tty: serial: 8250_dma: handle error on TX submit Sebastian Andrzej Siewior
2014-08-18 13:57 ` Heikki Krogerus
2014-09-01 14:38 ` Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 07/15] tty: serial: 8250_dma: enqueue RX dma again on completion Sebastian Andrzej Siewior
2014-08-18 10:52 ` One Thousand Gnomes
2014-08-29 15:52 ` Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 08/15] dmaengine: edma: fix two faults which happen with the 8250_dma user Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 09/15] dmaengine: omap-dma: complete the transfer on terminate_all Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 10/15] tty: serial: 8250_dma: Add a TX trigger workaround for AM33xx Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 11/15] tty: serial: 8250_dma: handle the when UART response while DMA remains idle Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 12/15] tty: serial: 8250_dma: add pm runtime Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 13/15] arm: dts: am33xx: add DMA properties for UART Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 14/15] arm: dts: dra7: " Sebastian Andrzej Siewior
2014-08-15 17:42 ` [PATCH 15/15] tty: serial: 8250: omap: add dma support Sebastian Andrzej Siewior
2014-08-15 21:02 ` Tony Lindgren
2014-08-21 8:34 ` Sebastian Andrzej Siewior
2014-08-21 18:44 ` Tony Lindgren
2014-08-27 19:54 ` Sebastian Andrzej Siewior
2014-08-27 20:23 ` Tony Lindgren
2014-08-28 8:23 ` Sebastian Andrzej Siewior
2014-08-28 16:46 ` Tony Lindgren
2014-08-28 19:37 ` Sebastian Andrzej Siewior
2014-08-28 22:54 ` Tony Lindgren
2014-08-29 9:32 ` Sebastian Andrzej Siewior
2014-08-29 15:55 ` Felipe Balbi
2014-08-29 16:12 ` Tony Lindgren [this message]
2014-08-29 16:31 ` Sebastian Andrzej Siewior
2014-09-01 17:47 ` Sebastian Andrzej Siewior
2014-09-02 3:05 ` Sebastian Reichel
2014-09-02 16:55 ` Tony Lindgren
2014-09-02 18:39 ` Sebastian Andrzej Siewior
2014-09-02 20:15 ` Tony Lindgren
2014-09-02 20:38 ` Sebastian Reichel
2014-09-03 16:46 ` Sebastian Andrzej Siewior
2014-09-03 17:48 ` Tony Lindgren
2014-09-04 13:44 ` Sebastian Andrzej Siewior
2014-09-04 14:52 ` Tony Lindgren
2014-09-04 14:56 ` Sebastian Andrzej Siewior
2014-09-04 16:25 ` Tony Lindgren
2014-08-15 18:17 ` [PATCH v7] 8250-core based serial driver for OMAP + DMA Lennart Sorensen
2014-08-15 19:14 ` Sebastian Andrzej Siewior
2014-08-15 20:28 ` Tony Lindgren
2014-08-17 20:35 ` Sebastian Andrzej Siewior
2014-08-18 15:15 ` Peter Hurley
2014-08-18 16:37 ` Felipe Balbi
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