linux-kernel - Re: [PATCH v2] ARM: dts: imx6dl: disable dma support for spi on i.mx6dl

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Message-ID: <541968D8.2060609@ahsoftware.de>
Date:	Wed, 17 Sep 2014 12:56:24 +0200
From:	Alexander Holler <holler@...oftware.de>
To:	Robin Gong <b38343@...escale.com>
CC:	shawn.guo@...escale.com, kernel@...gutronix.de, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	fugang.duan@...escale.com
Subject: Re: [PATCH v2] ARM: dts: imx6dl: disable dma support for spi on i.mx6dl

Am 17.09.2014 10:51, schrieb Robin Gong:
> On Tue, Sep 16, 2014 at 11:41:55AM +0200, Alexander Holler wrote:
>> Am 16.09.2014 05:52, schrieb Robin Gong:
>>> On Mon, Sep 15, 2014 at 01:50:02PM +0200, Alexander Holler wrote:
>>>> Am 10.09.2014 07:30, schrieb Robin Gong:
>>>>> There is one weird data in rxfifo after one full rx/tx transfer
>>>>> done sometimes. It looks a design issue and hard to workaround
>>>>> totally, so disable dma functhion here. And will re-enable it
>>>>> once the root cause found.
>>>>
>>>> Hmm, I experience problems with DMA too but on uart3. I'm using the same
>>>> workaround for the uart (I've just commented out the dma entries in the DT).
>>>> The problem manifests itself here such, that brcm_patchram_plus
>>>> hangs while uploading the firmware to a BCM4330 connected at uart3
>>>> (reproducible).

(...)

> Yes, we just have fixed the BT issue over high speed UART last month. Suggest
> you trying our patches based on v3.10.

Thanks for the pointer. Will look if I will find these patches.

Regards,

Alexander Holler

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