On Tue, Dec 10, 2019 at 04:03:53PM -0500, Sasha Levin wrote: > From: Daniel Vetter <daniel.vetter@xxxxxxxx> > > [ Upstream commit b2662a164f9dc48da8822e56600686d639056282 ] > > In DMA mode we have a maximum transfer size, past that the driver > falls back to PIO (see the check at the top of pxa2xx_spi_transfer_one). > Falling back to PIO for big transfers defeats the point of a dma engine, > hence set the max transfer size to inform spi clients that they need > to do something smarter. This won't fix anything by itself, this asks other code to change how it behaves which may or may not work in older kernels.
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