From: Huang Shijie <b32955@freescale.com>
To: Lauri Hintsala <lauri.hintsala@bluegiga.com>
Cc: gregkh@linuxfoundation.org, alan@linux.intel.com,
linux-serial@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, shawn.guo@linaro.org,
linux@arm.linux.org.uk, vinod.koul@intel.com,
Veli-Pekka Peltola <veli-pekka.peltola@bluegiga.com>
Subject: Re: [PATCH v2 2/3] serial: mxs-auart: add the DMA support for mx28
Date: Thu, 15 Nov 2012 11:20:35 +0800 [thread overview]
Message-ID: <50A45F83.1010009@freescale.com> (raw)
In-Reply-To: <50A21613.6030709@bluegiga.com>
于 2012年11月13日 17:42, Lauri Hintsala 写道:
> Hi Huang,
>
> DMA support doesn't work with latest stable v3.6.5 or development
> 3.7-rc5 kernels. I get following error message when I open the serial
> port /dev/ttyAPP0:
>
> [ 48.730000] mxs-auart 8006a000.serial: step 1 error
> [ 48.750000] mxs-auart 8006a000.serial: We can not start up the DMA.
>
I tested this patch set in imx28-evk board Rev C with linux-next-20121114.
it works fine.
Maybe you can try the linux-next code.
About the flow control:
If we do not enable the HW flow control, the data may lost. And I do not
know how to handle with the Xon/Xoff when the DMA is supported.
Best Regards
Huang Shijie
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WARNING: multiple messages have this Message-ID (diff)
From: b32955@freescale.com (Huang Shijie)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 2/3] serial: mxs-auart: add the DMA support for mx28
Date: Thu, 15 Nov 2012 11:20:35 +0800 [thread overview]
Message-ID: <50A45F83.1010009@freescale.com> (raw)
In-Reply-To: <50A21613.6030709@bluegiga.com>
? 2012?11?13? 17:42, Lauri Hintsala ??:
> Hi Huang,
>
> DMA support doesn't work with latest stable v3.6.5 or development
> 3.7-rc5 kernels. I get following error message when I open the serial
> port /dev/ttyAPP0:
>
> [ 48.730000] mxs-auart 8006a000.serial: step 1 error
> [ 48.750000] mxs-auart 8006a000.serial: We can not start up the DMA.
>
I tested this patch set in imx28-evk board Rev C with linux-next-20121114.
it works fine.
Maybe you can try the linux-next code.
About the flow control:
If we do not enable the HW flow control, the data may lost. And I do not
know how to handle with the Xon/Xoff when the DMA is supported.
Best Regards
Huang Shijie
next prev parent reply other threads:[~2012-11-15 3:16 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-24 10:27 [PATCH v2 0/3] serial: mxs-auart: add DMA support for auart in mx28 Huang Shijie
2012-10-24 10:27 ` Huang Shijie
2012-10-24 10:27 ` [PATCH v2 1/3] serial: mxs-auart: distinguish the different SOCs Huang Shijie
2012-10-24 10:27 ` Huang Shijie
2012-10-24 10:27 ` [PATCH v2 2/3] serial: mxs-auart: add the DMA support for mx28 Huang Shijie
2012-10-24 10:27 ` Huang Shijie
2012-10-25 4:18 ` Vinod Koul
2012-10-25 4:18 ` Vinod Koul
2012-10-25 5:50 ` Huang Shijie
2012-10-25 5:50 ` Huang Shijie
2012-10-25 6:07 ` Vinod Koul
2012-10-25 6:07 ` Vinod Koul
2012-10-25 9:15 ` Huang Shijie
2012-10-25 9:15 ` Huang Shijie
2012-10-25 11:08 ` Vinod Koul
2012-10-25 11:08 ` Vinod Koul
2012-11-05 3:16 ` Huang Shijie
2012-11-05 3:16 ` Huang Shijie
2012-11-13 9:42 ` Lauri Hintsala
2012-11-13 9:42 ` Lauri Hintsala
2012-11-15 3:20 ` Huang Shijie [this message]
2012-11-15 3:20 ` Huang Shijie
2012-11-15 7:22 ` Lauri Hintsala
2012-11-15 7:22 ` Lauri Hintsala
2012-11-15 9:11 ` Huang Shijie
2012-11-15 9:11 ` Huang Shijie
2012-11-15 11:51 ` Lauri Hintsala
2012-11-15 11:51 ` Lauri Hintsala
2012-10-24 10:27 ` [PATCH v2 3/3] ARM: dts: enable dma support for auart0 in mx28 Huang Shijie
2012-10-24 10:27 ` Huang Shijie
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