From: Alexander Holler <holler-SXC+2es9fhnfWeYVQQPykw@public.gmane.org>
To: Robin Gong <b38343-KZfg59tc24xl57MIdRCFDg@public.gmane.org>,
shawn.guo-KZfg59tc24xl57MIdRCFDg@public.gmane.org,
kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
pawel.moll-5wv7dgnIgG8@public.gmane.org,
mark.rutland-5wv7dgnIgG8@public.gmane.org,
ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org,
galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH v2] ARM: dts: imx6dl: disable dma support for spi on i.mx6dl
Date: Mon, 15 Sep 2014 13:50:02 +0200 [thread overview]
Message-ID: <5416D26A.4080707@ahsoftware.de> (raw)
In-Reply-To: <1410327012-31185-1-git-send-email-b38343-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
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).
So maybe there is a bug in the DMA-engine which not only effects SPI. Or
both drivers contain the same error in handling DMA (maybe through c&p).
But that's just specualtion from me, I haven't looked further into that
problem.
Regards,
Alexander Holler
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next prev parent reply other threads:[~2014-09-15 11:50 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-10 5:30 [PATCH v2] ARM: dts: imx6dl: disable dma support for spi on i.mx6dl Robin Gong
[not found] ` <1410327012-31185-1-git-send-email-b38343-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
2014-09-11 8:02 ` Shawn Guo
2014-09-15 9:41 ` Lucas Stach
[not found] ` <1410774073.3314.1.camel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2014-09-16 1:43 ` Shawn Guo
2014-09-16 3:41 ` Robin Gong
2014-09-16 9:50 ` Lucas Stach
[not found] ` <1410861006.2746.1.camel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2014-09-17 8:41 ` Robin Gong
2014-09-17 8:55 ` Lucas Stach
[not found] ` <1410944156.2731.1.camel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2014-09-17 9:19 ` Robin Gong
2014-09-17 9:19 ` Lucas Stach
[not found] ` <1410945574.2731.3.camel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2014-09-17 9:28 ` Robin Gong
2014-09-15 11:50 ` Alexander Holler [this message]
[not found] ` <5416D26A.4080707-SXC+2es9fhnfWeYVQQPykw@public.gmane.org>
2014-09-16 3:52 ` Robin Gong
2014-09-16 9:41 ` Alexander Holler
2014-09-17 8:51 ` Robin Gong
2014-09-17 10:56 ` Alexander Holler
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