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From: Trent Piepho <tpiepho@impinj.com>
To: "festevam@gmail.com" <festevam@gmail.com>
Cc: "mark.rutland@arm.com" <mark.rutland@arm.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"stefan@agner.ch" <stefan@agner.ch>,
	"robh+dt@kernel.org" <robh+dt@kernel.org>,
	"linux-imx@nxp.com" <linux-imx@nxp.com>,
	"kernel@pengutronix.de" <kernel@pengutronix.de>,
	"fabio.estevam@nxp.com" <fabio.estevam@nxp.com>,
	"shawnguo@kernel.org" <shawnguo@kernel.org>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 2/2] ARM: dts: imx7: add DMA properties for ECSPI
Date: Mon, 11 Feb 2019 22:22:07 +0000
Message-ID: <1549923727.3075.103.camel@impinj.com> (raw)
In-Reply-To: <CAOMZO5BrTLyg7Q51tPcHbN8S2VmA4HAENOVzNhw+Yx7Nniz3Gg@mail.gmail.com>

On Mon, 2019-02-11 at 19:34 -0200, Fabio Estevam wrote:
> Hi Trent,
> 
> On Mon, Feb 11, 2019 at 6:44 PM Trent Piepho <tpiepho@impinj.com> wrote:
> 
> > I've had more time to test.
> > 
> > Without DMA, I can reload my FPGA hundreds of times and get days of
> > uptime using linux-next.
> > 
> > With DMA, loading is unreliable.  The higher the SPI speed, the less
> > reliable it is.  Unfortunately, it's hard to duplicate the problem with
> > a small amount of data, and with a large amount of data I can't examine
> > it in depth enough to determine if the problem is related to SPI bus
> > timing or IMX sDMA sending the wrong bytes to the spi controller.
> > 
> > Using DMA with SPI causes kernel panics.  Not always immediately, but
> > after using DMA it's a smaller of minutes before something crashes.
> > The backtraces are all over the place and don't usually point back into
> > SPI.  It does seem like they usually hit something has allocated or is
> > allocating DMA memory.
> 
> Did you test with an external SDMA firmware or with the ROM SDMA firmware?
> 
> Just trying to understand if the SDMA firmware plays a role on this
> behavior or not.

The ROM firmware only.
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Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-07 13:22 [PATCH 1/2] ARM: dts: imx6ul: " Stefan Agner
2019-01-07 13:22 ` [PATCH 2/2] ARM: dts: imx7: " Stefan Agner
2019-02-07 21:00   ` Trent Piepho
2019-02-11  1:23     ` Shawn Guo
2019-02-11 20:14       ` Trent Piepho
2019-02-11 21:34         ` Fabio Estevam
2019-02-11 22:22           ` Trent Piepho [this message]
2019-02-12 19:37             ` Fabio Estevam
2019-02-13  0:07               ` Trent Piepho
2019-02-13  0:57                 ` Fabio Estevam
2019-02-13  1:10                   ` Trent Piepho
2019-02-12 19:20       ` Stefan Agner
2019-02-13 11:56         ` Mark Brown
2019-01-13  3:34 ` [PATCH 1/2] ARM: dts: imx6ul: " Shawn Guo

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