Hi Uffe,
many hanks for the reply,
>> Add warnings in case the edma engine driver fails to allocate slots or
>> channels requested from the davinci_mmc driver.
>>
>> Some ti-davinci based boards (i.e. board-da850-evm.c) are asking for
>> some reserved chans / slots at board init stage. Later, the mmc driver
>> results in a silent locked state.
>
> So why does davinci_acquire_dma_channels() succeed then? Isn't that
> real problem you should be looking into?
i explain with more details,
my custom am1808 board initialization, based on
arch/arm/mach-davinci/board-da850-evm.c, reserves some dma chans / slots
for the audio at
early boot.
While on kernel 3.5.1 mmc was working properly, moving to kernel
3.17.0, due to the dma-engine wrapper introduction (to be selected
into menuconfig), the mmc host driver locks silently. System cannot
even "reboot" after the failed attempt to reserve the dma slots.
I hardly found out the reason due to missing of clear warnings.
So there is nothing to fix in any other place. Simply, i am suggesting
a more visible warning so the driver, instead of lock-up silently,
throws a problem.
Feel free to add or discard the patch, as you can see it is nothing
functional.
Regards,
Angelo
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