I didn't read emails for a few days.
I don't have any specs for the hardware either.
I'll try to figure out that what is the problem.
I think that when the DMA transfer starts, cu1216_set_parameters()
should not be called at all.
The drivers should just keep on with the data transfer.
One possible fix might be that cu1216_set_parameters()
would set the fixed values: they should not be changed during the data
transfer.
Maybe reading other similar drivers help with this.
The other thing is that is it a bug or okay when the cu1216 is
nonresponsive during the data transfer.
Manu, How is this supposed to work?
Regards,
Marko
Pauli Borodulin kirjoitti:
Pauli Borodulin wrote:
[...]
The problem is: In the beginning the driver is able to communicate with
cu1216 using I2C. For example, the driver is able to check that the
demodulator is there using cu1216_readreg(). As soon as DMA is started (you
get "mantis start feed & dma" in your kernel log), all i2c reading and
writing fails. Every read returns 0. I have not yet found out why. You can
verify this by adding
[...]
I made a quick and dirty hack and commented out the contents of the
functions mantis_dma.c/mantis_dma_start() and mantis_dma.c/mantis_dma_stop()
and now I2C seems to works ok. This will totally break the driver, so it's
not a fix. I did it because I was curios whether it would make any
difference, and it did. I then tried uncommenting lines in
mantis_dma_start() one by one starting from the beginning, and found out
that the line
mmwrite(MANTIS_GPIF_RDWRN, MANTIS_GPIF_ADDR);
was the one that triggered the bug. I have no knowledge on the hardware in
question (I don't have any datasheets etc.), so I have no idea what I should
do next. There's also some bugs in the cu1216 driver, but it's no use to
debug them before the DMA(?) problem is fixed.
Br,
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