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(parent: 03e627c) | patch
spi: rspi: Add DMA support for QSPI on R-Car Gen2
authorGeert Uytterhoeven <geert+renesas@glider.be>
Mon, 2 Jun 2014 13:38:17 +0000 (15:38 +0200)
committerMark Brown <broonie@linaro.org>
Mon, 2 Jun 2014 14:49:35 +0000 (15:49 +0100)
commit4f12b5e529e4ff274eb478ec1c2ef41358ed9577
tree20d86f05f6256125bc0004ec57da9d0be3b4cc7btree | snapshot (tar.gz zip)
parent03e627c55752fa434d5b3eba5ee3e489c51672b6commit | diff
spi: rspi: Add DMA support for QSPI on R-Car Gen2

Enable DMA support for QSPI on R-Car Gen2, for Single, Dual, and Quad SPI
Transfers.

Performance figures for reading from a QSPI FLASH driven at 24.375 MHz
on r8a7791/koelsch:
  - Single:  1.1 Mbps PIO, 23 Mbps DMA
  - Dual  : 12.7 Mbps PIO, 48 Mbps DMA
  - Quad  : 13   Mbps PIO, 70 Mbps DMA

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>
drivers/spi/spi-rspi.c diff | blob | blame | history