From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
tony@atomide.com, balbi@ti.com, Vinod Koul <vinod.koul@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH v7] 8250-core based serial driver for OMAP + DMA
Date: Fri, 15 Aug 2014 21:14:00 +0200 [thread overview]
Message-ID: <53EE5BF8.3010007@linutronix.de> (raw)
In-Reply-To: <20140815181704.GH17769@csclub.uwaterloo.ca>
On 08/15/2014 08:17 PM, Lennart Sorensen wrote:
> Are you saying that with the new driver you have to respond to the RX
> irq faster than before to avoid overflows? It is not quite clear.
Yes. The irq fires 46 bytes giving you 16 bytes buffer before overflow
vs 63 bytes buffer the old one had.
> I do think 40000 interrupts to handle 40000 bytes of date does seem a
> tad inefficient, so dropping to 854 looks a lot nicer. Was the omap
> driver not using the fifo trigger levels at all?
It configured the trigger levels to 1 for RX and 16 for TX.
Sebastian
next prev parent reply other threads:[~2014-08-15 19:14 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
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 [this message]
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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