Ira W. Snyder wrote:
> This leads me to believe that this occurs mostly (but not always)
> concurrent with the end-of-chain interrupt.
Have you tested this on an 85xx platform?
I noticed something odd. You're modifying fsldma_chan_irq(), which is for
DMA controllers that have per-channel IRQs. 83xx devices don't have
per-channel IRQs -- all channels on one controller have the same IRQ.
Looking at the device tree, I see that the IRQs are listed in the channel
nodes *and* in the controller node. I don't see how we ever use the
per-controller ISR.
I wonder if the shared IRQ is the part of the cause of the interrupts
you're seeing.
>
> In the last month, the "unhandled sr" error has occurred on 92 out of
> 120 boards in production use. The statistics are included below. On some
> boards, it is much more frequent than on others. All boards have roughly
> the same workload.
>
> Another interesting tidbit from my logs: this only occurs on DMA channel
> 2 (the are numbered starting at 0, it is the 3rd channel). Here is an
> example log message:
What happens if you never register that channel? That is, remove this
node from the device tree:
dma-channel@100 {
compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
reg = <0x100 0x80>;
cell-index = <2>;
interrupt-parent = <&ipic>;
interrupts = <71 8>;
};
--
Timur Tabi
Linux kernel developer at Freescale
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