> >>>> Yes please post full log of PIO only and DMA only Also, in above
> >>>> log, lots of DMA transfer went thru fine except this one transfer
> >>>> where DMA timed out.
> >>>> DMA completion doesnt happen on DMA submit during this particular
> >>>> transaction timeframe for some reason.
> >>>
> >>> Dmitry, can you provide some background information on the setup
> >>> that you're using? I vaguely remember something about i2c@7000d000
> >>> being special on older Tegra devices. Perhaps there's something
> >>> additional that we need to take into account?
> >>>
> >>> Aha! Look at tegra_i2c_reg_addr() which special-cases I2C_TX_FIFO on
> >>> the DVC variant of the controller, which is exactly the one that you
> >>> are seeing the timeouts on and it's exactly the register that we use
> >>> as destination for the DMA transfer.
> >>>
> >>> I think we need to do something like this:
> >>>
> >>> slv_config.dst_addr = i2c_dev->base_phys +
> >>> tegra_i2c_reg_addr(i2c_dev, I2C_TX_FIFO);
> >>>
> >>> to make sure we pass the right FIFO register address to DMA.
> >>
> >> I'm running it on T20 at the moment. I don't know about the DVC quirks,
> >> but sounds plausible. Please let me know if you need any other info.
> >>
> >> Here the full logs:
> >>
> >> PIO-only: http://dpaste.com/2MX3EAN.txt
> >> DMA-only: http://dpaste.com/3VXZSSM.txt
> >>
> >> Note the "Failed to read T44 and T5 (-110)" error that happens in
> >> DMA-only. And it happens on i2c@7000c000, DVC is i2c@7000d000.
> >
> > Yes this is due to same issue theirry mentioned.
> > Prior to transfer timeout for touch, tps6586x regulator probe failed due to
> > i2c timeout which uses DVC (7000D000) and since DMA mode is enforced all
> > DVC/PWR I2C transactions also go thru DMA and FIFO register for DVC offset
> > is not accounted when configure to dma slave.
> > Will fix and send so you can see for repro with updated patch..
> >
> >
> > [ 0.925155] tegra-i2c 7000d000.i2c: starting DMA for length: 16
> > [ 0.925165] tegra-i2c 7000d000.i2c: unmasked irq: 0c
> > [ 1.028961] tegra-i2c 7000d000.i2c: i2c transfer timed out
> > [ 1.028968] tegra-i2c 7000c000.i2c: DMA transfer timeout
> > [ 1.028995] tps6586x 3-0034: Chip ID read failed: -110
> > [ 1.029029] tps6586x: probe of 3-0034 failed with error -5
> > [ 1.029045] atmel_mxt_ts 0-004c: __mxt_read_reg: i2c transfer failed
> > (-110)
> > [ 1.029051] atmel_mxt_ts 0-004c: Failed to read T44 and T5 (-110)
> >
>
> I think tps6586x and atmel-touch should be independent issues, but will see.
> Thanks!
Whats your platform setup? Is atmel touch power ON default or its programmed
during boot by SW whcih need to use DVC?
