spi: atmel: Implements transfers with bounce buffer

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This patch enables SPI DMA transfers for Atmel SAM9 SoCs and implements a
bounce buffer for transfers which have vmalloc allocated buffers. Those
buffers are not cache coherent even if they have been transformed into sg
lists. UBIFS is affected by this cache coherency issue.

In this patch I also reverted "spi: atmel: fix corrupted data issue on SAM9
family SoCs"(7094576ccdc3acfe1e06a1e2ab547add375baf7f).

Signed-off-by: Radu Pirea <radu.pirea@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

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Radu Pirea 2017-12-19 17:17:59 +02:00 • committed by Mark Brown

parent 66e900a3d2

commit a9889ed62d

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1 changed files with 84 additions and 29 deletions

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drivers/spi/spi-atmel.c

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