linux-kernel - RE: [RFC PATCH v3 00/16] DMA Engine support for AM33XX

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Date:	Fri, 19 Oct 2012 12:02:42 +0000
From:	"Bedia, Vaibhav" <vaibhav.bedia@...com>
To:	"Porter, Matt" <mporter@...com>
CC:	Tony Lindgren <tony@...mide.com>, "Nori, Sekhar" <nsekhar@...com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"Cousson, Benoit" <b-cousson@...com>,
	Russell King <linux@....linux.org.uk>,
	Vinod Koul <vinod.koul@...el.com>,
	Rob Landley <rob@...dley.net>, Chris Ball <cjb@...top.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Arnd Bergmann <arnd@...db.de>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
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	Linux SPI Devel List 
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	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [RFC PATCH v3 00/16] DMA Engine support for AM33XX

On Fri, Oct 19, 2012 at 16:45:58, Porter, Matt wrote:
> On Fri, Oct 19, 2012 at 10:26:20AM +0000, Bedia, Vaibhav wrote:
[...]
> > 
> > I didn't see all the patches that you posted on edma-dmaengine-v3
> > but I do seem them on edma-dmaengine-am33xx-v3 branch.
> 
> I see I referenced the wrong branch in the cover letter. Thanks for
> testing and noticing this. Sorry to make you hunt for the correct
> branch in that repo. ;) 
> 

No problem.

> https://github.com/ohporter/linux/tree/edma-dmaengine-am33xx-v3
> is indeed the correct branch for those wanting to pull this in or
> grab some of the not-to-be-merged drivers I used for testing.
> 
> > I added a couple of patches to enable earlyprintk and build the DTB
> > appended kernel image uImage-dtb.am335x-evm
> > 
> > Here's what i see
> > 
> > [...]
> 
> <snip>
> 
> > [    0.175354] edma: probe of 49000000.edma failed with error -16
> 
> I missed an uninitialized pdata case in the bug fixes mentioned in
> the changelog and the folks previously failing the same way didn't
> hit the case I suspect you are hitting. Can you try this and let me
> know how it works?
> 

That doesn't help :(

Looking at the original crash log, I suspect something is not correct
with the irq portion, probably in the DT or the driver. 

"genirq: Flags mismatch irq 28. 00000000 (edma) vs. 00000000 (edma)"

The warning below that is coming due to fail case in edma_probe not tracking
the request_irq status properly and but IMO that's a separate issue.

BTW, I am trying this on the EVM.

Regards,
Vaibhav
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