spi: spi-ti-qspi: Add DMA support for QSPI mmap read

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Use mem-to-mem DMA to read from flash when reading in mmap mode. This
gives improved read performance and reduces CPU load.

With this patch the raw-read throughput is ~16MB/s on DRA74 EVM. And CPU
load is <20%. UBIFS read throughput ~13 MB/s.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

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Vignesh R 2016-08-17 15:22:37 +05:30 • committed by Mark Brown

parent 29b4817d40

commit 5720ec0a6d

1 changed files with 122 additions and 17 deletions

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drivers/spi/spi-ti-qspi.c

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