[PATCH RFC 00/26] Migrate more OMAP DMA code to DMA engine

[tony@atomide.com (Tony Lindgren)]

* Russell King - ARM Linux <linux@arm.linux.org.uk> [140113 13:13]:
> On Mon, Jan 13, 2014 at 01:02:42PM -0800, Tony Lindgren wrote:
> > * Russell King - ARM Linux <linux@arm.linux.org.uk> [140113 12:36]:
> > > On Mon, Jan 13, 2014 at 11:26:31AM -0800, Tony Lindgren wrote:
> > > > * Russell King - ARM Linux <linux@arm.linux.org.uk> [140113 10:57]:
> > > > > On Mon, Jan 13, 2014 at 09:37:45AM -0800, Tony Lindgren wrote:
> > > > > > * Russell King - ARM Linux <linux@arm.linux.org.uk> [140113 08:48]:
> > > > > > > Any news on this?
> > > > > > 
> > > > > > Sorry for the delay, now getting this:
> > > > > > 
> > > > > > arch/arm/mach-omap1/dma.c: In function ?omap1_system_dma_init?:
> > > > > > arch/arm/mach-omap1/dma.c:368: error: ?struct omap_dma_dev_attr? has no member named ?chan?
> > > > > 
> > > > > Gah.  Next incremental patch:
> > > > 
> > > > Thanks, now getting this on omap1:
> > > > 
> > > > # dmesg | grep -i dma
> > > > DMA: preallocated 256 KiB pool for atomic coherent allocations
> > > > OMAP DMA hardware version 1
> > > > DMA capabilities: 0000000c:00000000:01ff:003f:007f
> > > > omap-dma-engine omap-dma-engine: invalid resource
> > > > omap-dma-engine: probe of omap-dma-engine failed with error -22
> > > > mmci-omap mmci-omap.1: unable to obtain TX DMA engine channel 54
> > > > mmci-omap mmci-omap.1: unable to obtain RX DMA engine channel 55
> > > 
> > > Sigh... let's give it the iomem resource then:
> > 
> > OK, looks like adding that makes MMC card detection to fail with:
> > 
> > DMA timeout with device 55
> 
> You should also see a message:
> 
> oma-dma-engine omap-dma-engine: failed to get L1 IRQ: ..
> 
> which indicates that it's falling back to the old driver for IRQ
> servicing.  Can you confirm that please?

Yes that's correct, here are all the DMA related lines:

DMA: preallocated 256 KiB pool for atomic coherent allocations
OMAP DMA hardware version 1
DMA capabilities: 0000000c:00000000:01ff:003f:007f
omap-dma-engine omap-dma-engine: failed to get L1 IRQ: -6
omap-dma-engine omap-dma-engine: OMAP DMA engine driver
omap-dma-engine omap-dma-engine: allocating channel 0 for 54
omap-dma-engine omap-dma-engine: allocating channel 1 for 55
DMA timeout with device 55

Regards,

Tony