On Wed, Nov 15, 2017 at 02:45:45AM +0000, alexander.levin@xxxxxxxxxxx wrote: > We can no longer rely on the return value of > devm_snd_dmaengine_pcm_register(...) to check if the DMA > handle is declared in the DT. > Previously this check activated PIO mode but currently > dma_request_chan returns either a valid channel or -EPROBE_DEFER. So when did the corresponding change to the dmaengine API go in? > In order to activate PIO mode check instead if the interrupt > line is declared. This reflects better what is documented in > the DT bindings (see Documentation/devicetree/bindings/sound/ > designware-i2s.txt). > Also, initialize use_pio variable which was never being set > causing PIO mode to never work. Though if PIO mode never worked presumably this isn't that urgent...
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