[PATCH] spi: spi-fsl-dspi: fix DMA mapping

[Michael Walle]

Am 2020-03-10 08:40, schrieb Michael Walle:
> Am 2020-03-10 08:33, schrieb Michael Walle:
>> Use the correct device to request the DMA mapping. Otherwise the IOMMU
>> doesn't get the mapping and it will generate a page fault.
>> 
>> The error messages look like:
>> [    3.008452] arm-smmu 5000000.iommu: Unhandled context fault:
>> fsr=0x402, iova=0xf9800000, fsynr=0x3f0022, cbfrsynra=0x828, cb=8
>> [    3.020123] arm-smmu 5000000.iommu: Unhandled context fault:
>> fsr=0x402, iova=0xf9800000, fsynr=0x3f0022, cbfrsynra=0x828, cb=8
>> 
>> This was tested on a custom board with a LS1028A SoC.
> 
> Oh fu.. please disregard this patch. DMA mapping still isn't working.
> Somehow I missed that the transfer mode was turned back to its default
> XSPI mode.

Damn. I need more coffee.. this patch IS working. Only the first probe
fails due to EPROBE_DEFER.

[    2.539706] fsl-dspi 2120000.spi: rx dma channel not available (-517)
[    2.546200] fsl-dspi 2120000.spi: can't get dma channels
[    3.622774] spi-nor spi1.0: w25q128fw (16384 Kbytes)

-michael