Hi Ira,
On 03/01/2011 02:21 AM, Ira W. Snyder wrote:
On Mon, Feb 28, 2011 at 11:27:40PM +0200, Felix Radensky wrote:
Hi Ira,
On 02/28/2011 11:11 PM, Ira W. Snyder wrote:
On Mon, Feb 28, 2011 at 10:15:49PM +0200, Felix Radensky wrote:
Hi Ira,
Thank you very much Felix. The dmesg output shows that the controller
never got an interrupt for the second transaction. The patch below has
extra debugging information that may help determine why this happens.
Please apply it and re-run the test.
The last section of dmesg (after "Freeing unused kernel memory") is all
I need.
Attached relevant dmesg portion.
Ok, try this patch on top of the last one.
It looks like you used the dmatest module in multi-channel mode last
time. One channel makes it easier to debug:
modprobe dmatest max_channels=1 threads_per_chan=2 iterations=1
Thanks for your help in debugging this. Hopefully this is the last
patch to test. :)
Ira
Looks like this was not the last one. The test still fails, see below
From this log, it looks like the DMA controller is not generating an
interrupt after the second chain is started. The first chain is finished
before the second thread runs and starts its chain.
The end-of-segments interrupt is completely missing. The part is not
behaving as the datasheet explains it should. Are you sure you applied
the patch and rebuilt the kernel? (Just checking to be sure. I'm very
appreciative of the amount of help you've given me debugging this!)
Can you run this for me:
modprobe dmatest max_channels=1 threads_per_chan=1 iterations=4
Thanks again,
Ira
Without your patches applied the output of the test above looks
like this:
__dma_request_channel: success (dma0chan0)
dmatest: Started 1 threads using dma0chan0
of:fsl-elo-dma ffe0c300.dma: irq: channel 0, stat = 0xa
of:fsl-elo-dma ffe0c300.dma: irq: End-of-segments INT
of:fsl-elo-dma ffe0c300.dma: irq: clndar 0x2f34d000, nlndar 0x100000000
of:fsl-elo-dma ffe0c300.dma: irq: End-of-link INT
of:fsl-elo-dma ffe0c300.dma: no pending LDs
of:fsl-elo-dma ffe0c300.dma: irq: Exit
of:fsl-elo-dma ffe0c300.dma: chan completed_cookie = 1
of:fsl-elo-dma ffe0c300.dma: LD ef34d000 callback
of:fsl-elo-dma ffe0c300.dma: chan completed_cookie = 1
dma0chan0-copy0: verifying source buffer...
dma0chan0-copy0: verifying dest buffer...
dma0chan0-copy0: #0: No errors with src_off=0xb90 dst_off=0x101c
len=0x2aea
of:fsl-elo-dma ffe0c300.dma: irq: channel 0, stat = 0xa
of:fsl-elo-dma ffe0c300.dma: irq: End-of-segments INT
of:fsl-elo-dma ffe0c300.dma: irq: clndar 0x2f34d000, nlndar 0x100000000
of:fsl-elo-dma ffe0c300.dma: irq: End-of-link INT
of:fsl-elo-dma ffe0c300.dma: no pending LDs
of:fsl-elo-dma ffe0c300.dma: irq: Exit
of:fsl-elo-dma ffe0c300.dma: chan completed_cookie = 2
of:fsl-elo-dma ffe0c300.dma: LD ef34d000 callback
of:fsl-elo-dma ffe0c300.dma: chan completed_cookie = 2
dma0chan0-copy0: verifying source buffer...
dma0chan0-copy0: verifying dest buffer...
dma0chan0-copy0: #1: No errors with src_off=0x74a dst_off=0x54d len=0x35f5
of:fsl-elo-dma ffe0c300.dma: irq: channel 0, stat = 0xa
of:fsl-elo-dma ffe0c300.dma: irq: End-of-segments INT
of:fsl-elo-dma ffe0c300.dma: irq: clndar 0x2f34d000, nlndar 0x100000000
of:fsl-elo-dma ffe0c300.dma: irq: End-of-link INT
of:fsl-elo-dma ffe0c300.dma: no pending LDs
of:fsl-elo-dma ffe0c300.dma: irq: Exit
of:fsl-elo-dma ffe0c300.dma: chan completed_cookie = 3
of:fsl-elo-dma ffe0c300.dma: LD ef34d000 callback
of:fsl-elo-dma ffe0c300.dma: chan completed_cookie = 3
dma0chan0-copy0: verifying source buffer...
dma0chan0-copy0: verifying dest buffer...
dma0chan0-copy0: #2: No errors with src_off=0x2ad dst_off=0x557 len=0x35e1
of:fsl-elo-dma ffe0c300.dma: irq: channel 0, stat = 0xa
of:fsl-elo-dma ffe0c300.dma: irq: End-of-segments INT
of:fsl-elo-dma ffe0c300.dma: irq: clndar 0x2f34d000, nlndar 0x100000000
of:fsl-elo-dma ffe0c300.dma: irq: End-of-link INT
of:fsl-elo-dma ffe0c300.dma: no pending LDs
of:fsl-elo-dma ffe0c300.dma: irq: Exit
of:fsl-elo-dma ffe0c300.dma: chan completed_cookie = 4
of:fsl-elo-dma ffe0c300.dma: LD ef34d000 callback
of:fsl-elo-dma ffe0c300.dma: chan completed_cookie = 4
dma0chan0-copy0: verifying source buffer...
dma0chan0-copy0: verifying dest buffer...
dma0chan0-copy0: #3: No errors with src_off=0x0 dst_off=0x0 len=0x4000
dma0chan0-copy0: terminating after 4 tests, 0 failures (status 0)
Felix.
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