Re: SPI regression with today's build

[Noralf Trønnes <noralf@xxxxxxxxxxx>]

Den 14.06.2019 10.28, skrev Andy Shevchenko:
> On Wed, May 8, 2019 at 9:27 PM Noralf Trønnes <noralf@xxxxxxxxxxx> wrote:
>> [cc:Martin]
>> Den 08.05.2019 19.07, skrev Nicolas Saenz Julienne:
> 
>> Unless Martin Sperl, who wrote spi_split_transfers_maxsize(), has other
>> suggestions, I think we should just revert this patch.
> 
> I gave a suggestion during LPC 2016 about this all stuff. We have to
> provide a DMA channel capability to tell user what is the maximum
> length is supported by the DMA engine. In such case the user may
> prepare the transfers which are satisfying limitations and no
> recreation is necessary, moreover, it will be performance wise to do
> so.
> 

In this case the problem isn't the DMA engine, but the SPI controller
DLEN register which limits the overall transfer to ~64kB.

Noralf.