mtd: spi-nor: cadence-quadspi: Handle probe deferral while requesting DMA channel

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dma_request_chan_by_mask() can throw EPROBE_DEFER if DMA provider
is not yet probed. Currently driver just falls back to using PIO mode
(which is less efficient) in this case. Instead return probe deferral
error as is so that driver will be re probed once DMA provider is
available.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20200601070444.16923-6-vigneshr@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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Vignesh Raghavendra 2020-06-01 12:34:41 +05:30 • committed by Mark Brown

parent c61088d1f9

commit 935da5e510

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drivers/mtd/spi-nor/controllers/cadence-quadspi.c

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