linux-kernel - Re: [PATCH 0/3] omap_hsmmc DT DMA Client support

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Date:	Wed, 6 Feb 2013 13:41:06 +0100
From:	Lars Poeschel <poeschel@...onage.de>
To:	Matt Porter <mporter@...com>
Cc:	Venkatraman S <svenkatr@...com>, Chris Ball <cjb@...top.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Tony Lindgren <tony@...mide.com>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>, Dan Williams <djbw@...com>,
	Jon Hunter <jon-hunter@...com>,
	Santosh Shilimkar <santosh.shilimkar@...com>
Subject: Re: [PATCH 0/3] omap_hsmmc DT DMA Client support

Hi Matt!

At first thanks for you efforts on DMA Engine on AM33XX.

On Friday 01 February 2013 at 22:01:17, Matt Porter wrote:
> This series adds DT DMA Engine Client support to the omap_hsmmc.
> It leverages the generic DMA OF helpers in -next and the
> dma_request_slave_channel_compat() wrapper introduced in the
> AM33XX DMA Engine series to support DMA in omap_hsmmc on platforms
> booting via DT. These platforms include omap2/3/4/5 and am33xx.
> 
> These patches were split out from the v5 version of the AM33XX DMA
> series and split from the EDMA-specific omap_hsmmc changes.
> 
> The series depends on the following patches:
> 
> 	- dmaengine DT support and edma dmaengine driver fix from
> 	  the git://git.infradead.org/users/vkoul/slave-dma.git next
> 	  branch
> 	- dma_request_slave_channel_compat() support
> 	  https://patchwork.kernel.org/patch/2081671/
> 
> The series with all dependencies can be found at
> https://github.com/ohporter/linux/tree/omap-hsmmc-dt-dmaengine-v1

I cloned your github repository and did short testing with it. I get the 
following error when the kernel mounts my sd-card:

Starting udev
[    5.884738] udevd[72]: starting version 182
[    8.879651] edma-dma-engine edma-dma-engine.0: Exceeded max SG segments 33 
> 16
[    8.887377] omap_hsmmc mmc.3: prep_slave_sg() failed
[    8.892588] omap_hsmmc mmc.3: MMC start dma failure
[    8.897725] mmcblk0: unknown error -1 sending read/write command, card 
status 0x900
[    8.905889] end_request: I/O error, dev mmcblk0, sector 17039
[    8.911926] end_request: I/O error, dev mmcblk0, sector 17047
[    8.917934] end_request: I/O error, dev mmcblk0, sector 17055
[    8.923960] end_request: I/O error, dev mmcblk0, sector 17063
[    8.929967] end_request: I/O error, dev mmcblk0, sector 17071
[    8.935988] end_request: I/O error, dev mmcblk0, sector 17079
[    8.942010] end_request: I/O error, dev mmcblk0, sector 17087
[    8.948016] end_request: I/O error, dev mmcblk0, sector 17095
[    8.954037] end_request: I/O error, dev mmcblk0, sector 17103
[    8.960043] end_request: I/O error, dev mmcblk0, sector 17111
[    9.020919] EXT4-fs error (device mmcblk0p2): __ext4_get_inode_loc:3764: 
inode #8: block 239: comm mount: unable to read itable block
[    9.033514] EXT4-fs (mmcblk0p2): no journal found
[    9.043799] kjournald starting.  Commit interval 5 seconds
[    9.049589] EXT3-fs (mmcblk0p2): warning: mounting fs with errors, running 
e2fsck is recommended
[    9.060940] EXT3-fs (mmcblk0p2): using internal journal
[    9.066437] EXT3-fs (mmcblk0p2): recovery complete
[    9.071460] EXT3-fs (mmcblk0p2): mounted filesystem with ordered data mode

After that the filesystem on the sd-card has an error that I have to fix with 
e2fsck. As rootfs I use a nfsroot.
In my quick tests, same setup, I don't get any error on edma-dmaengine-
am33xx-v5 branch of your repository.
If you need any further information, let me now.

Regards,
Lars
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