From: Trent Piepho <tpiepho@impinj.com>
To: "festevam@gmail.com" <festevam@gmail.com>
Cc: "linux-imx@nxp.com" <linux-imx@nxp.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"stefan@agner.ch" <stefan@agner.ch>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"fabio.estevam@nxp.com" <fabio.estevam@nxp.com>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"shawnguo@kernel.org" <shawnguo@kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"kernel@pengutronix.de" <kernel@pengutronix.de>,
"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>
Subject: Re: [PATCH 2/2] ARM: dts: imx7: add DMA properties for ECSPI
Date: Wed, 13 Feb 2019 00:07:17 +0000 [thread overview]
Message-ID: <1550016436.3075.127.camel@impinj.com> (raw)
In-Reply-To: <CAOMZO5Ccovx2hMU0SmPm9ToZDNXOdLWkoQ8QT7EOhLocL7GAEQ@mail.gmail.com>
On Tue, 2019-02-12 at 17:37 -0200, Fabio Estevam wrote:
> On Mon, Feb 11, 2019 at 8:22 PM Trent Piepho <tpiepho@impinj.com>
> wrote:
>
> > > Just trying to understand if the SDMA firmware plays a role on
> > > this
> > > behavior or not.
> >
> > The ROM firmware only.
>
> Does the problem also happen if the external SDMA firmware is used?
> Just trying to narrow it down.
Tried SDMA firmware 4.2. Still broken. No apparent change.
Get 4 cycle pause after each byte.
And crash while/after using DMA. Clearly some sort of memory
corruption going on. Fortunately, it's very reliable that using DMA
almost immediately causes a problem and this is easy to reproduce. I
think that indicates it's either clobbers a lot of RAM, or consistently
manages to hit a very important location for kernel memory allocators.
I've got an idea of where that might be happening that I'm looking
into.
I think it's reasonable to add the dma attributes, but put a check in
the spi-imx driver to disable DMA on imx7d at least.
next prev parent reply other threads:[~2019-02-13 0:07 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-07 13:22 [PATCH 1/2] ARM: dts: imx6ul: add DMA properties for ECSPI 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
2019-02-12 19:37 ` Fabio Estevam
2019-02-13 0:07 ` Trent Piepho [this message]
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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