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From: bigeasy@linutronix.de (Sebastian Andrzej Siewior)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v8 00/18] 8250-core based serial driver for OMAP + DMA
Date: Wed, 10 Sep 2014 18:56:37 +0200
Message-ID: <541082C5.7040608@linutronix.de> (raw)
In-Reply-To: <20140910141554.GC22315@ci00147.xsens-tech.local>

On 09/10/2014 04:15 PM, Frans Klaver wrote:
> On Tue, Sep 09, 2014 at 09:41:20PM +0200, Sebastian Andrzej Siewior wrote:
>> On 09/08/2014 08:33 PM, Frans Klaver wrote:
>>> Thanks. I'll give it a spin on Wednesday.
>>
>> Could you please pull the upcoming v9 first?
>>
>>  git://git.breakpoint.cc/bigeasy/linux.git uart_v9_pre1
>>
>> This solves a few of my am335x related issues.
> 
> Using v9_pre1, I get a kernel panic in edma_dma_pause() on echan->edesc
> being NULL. I do get data before this happens. This is at high speed,
> high rate. No mention of the irq having too much to do, though. The more
> data I transmit, the more likely this is to occur.

Hmm. This shouldn't happen because if dma->rx_running is set, then
there should be a descriptor to pause.
Could check how this could happen? (and which event tries to do so)

In the meantime, the lower part of [0] should fix the NULL bug.

[0] https://lkml.org/lkml/2014/7/29/506

> I don't currently have the setup to lower the baudrate. I would probably
> need to reproduce this on a beaglebone, instead of our custom board.
> I'll see if I can do that.
> 
> If you need more info, just let me know.

I just pushed uart_v9_pre2 and I will post it once I rebased it on top
Greg's latest.
There was a bug where THRE could be active longer than needed caused a
few not needed interrupts until the FIFO was empty again.

My "less on file" test case did not fail anymore with this.

> Thanks,
> Frans

Sebastian

  reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-05 19:02 Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 01/18] tty: serial: 8250_core: provide a function to export uart_8250_port Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 02/18] tty: serial: 8250_core: allow to overwrite & export serial8250_startup() Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 03/18] tty: serial: 8250_core: allow to set ->throttle / ->unthrottle callbacks Sebastian Andrzej Siewior
2014-09-08 23:33   ` Greg Kroah-Hartman
2014-09-09  0:41     ` Tony Lindgren
2014-09-05 19:02 ` [PATCH 04/18] tty: serial: 8250_core: add run time pm Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 05/18] tty: serial: 8250_core: read only RX if there is something in the FIFO Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 06/18] tty: serial: 8250_core: user the ->line argument as a hint in serial8250_find_match_or_unused() Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 07/18] tty: serial: 8250_core: remove UART_IER_RDI in serial8250_stop_rx() Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 08/18] tty: serial: Add 8250-core based omap driver Sebastian Andrzej Siewior
2014-09-08 16:39   ` Tony Lindgren
2014-09-05 19:02 ` [PATCH 09/18] tty: serial: 8250_dma: handle error on TX submit Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 10/18] tty: serial: 8250_dma: enqueue RX dma again on completion Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 11/18] tty: serial: 8250_dma: Add a TX trigger workaround for AM33xx Sebastian Andrzej Siewior
2014-09-08 16:41   ` Tony Lindgren
2014-09-08 16:45     ` Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 12/18] tty: serial: 8250_dma: optimize the xmit path due to UART_BUG_DMA_TX Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 13/18] tty: serial: 8250_dma: keep own book keeping about RX transfers Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 14/18] tty: serial: 8250_dma: handle the when UART response while DMA remains idle Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 15/18] tty: serial: 8250_dma: add pm runtime Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 16/18] arm: dts: am33xx: add DMA properties for UART Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 17/18] arm: dts: dra7: " Sebastian Andrzej Siewior
2014-09-05 19:02 ` [PATCH 18/18] tty: serial: 8250: omap: add dma support Sebastian Andrzej Siewior
2014-09-08 14:46 ` [PATCH v8 00/18] 8250-core based serial driver for OMAP + DMA Frans Klaver
2014-09-08 15:15   ` Sebastian Andrzej Siewior
2014-09-08 16:33     ` Sebastian Andrzej Siewior
2014-09-08 18:25       ` Frans Klaver
2014-09-08 18:33     ` Frans Klaver
2014-09-09 19:41       ` Sebastian Andrzej Siewior
2014-09-10 14:15         ` Frans Klaver
2014-09-10 16:56           ` Sebastian Andrzej Siewior [this message]
2014-09-08 17:40 ` Tony Lindgren
2014-09-08 17:55   ` Tony Lindgren
2014-09-09  7:33     ` Sebastian Andrzej Siewior

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