Messages in this thread |  | | Date | Thu, 19 Dec 2019 12:35:04 -0500 | From | Sasha Levin <> | Subject | Re: [PATCH AUTOSEL 5.4 128/350] spi: pxa2xx: Set controller->max_transfer_size in dma mode |
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On Wed, Dec 11, 2019 at 10:47:38AM +0000, Mark Brown wrote: >On Tue, Dec 10, 2019 at 04:03:53PM -0500, Sasha Levin wrote: >> From: Daniel Vetter <daniel.vetter@ffwll.ch> >> >> [ 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.
I'll drop it then, thanks!
-- Thanks, Sasha
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