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spi: rspi: Configure DMA slave bus width to 8 bit 

The new Renesas R-Car Gen2 DMA Controller driver (rcar-dmac) requires
explicit configuration of the DMA slave bus width.
Hardcode the DMA transfer size to 1 byte for both directions, as that's
the only supported configuration (16-bit DMA support was removed in
commit 9c5de2c175 ("spi: rspi: Remove
unused 16-bit DMA support")).

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Geert Uytterhoeven 2014-08-06 14:59:01 +02:00 committed by Mark Brown
parent 43937455c9
commit a30b95a7d8
1 changed files with 5 additions and 2 deletions
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7
drivers/spi/spi-rspi.c
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@ -919,10 +919,13 @@ static struct dma_chan *rspi_request_dma_chan(struct device *dev,
memset(&cfg, 0, sizeof(cfg));
cfg.slave_id = id;
cfg.direction = dir;
if (dir == DMA_MEM_TO_DEV)
if (dir == DMA_MEM_TO_DEV) {
cfg.dst_addr = port_addr;
else
cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
} else {
cfg.src_addr = port_addr;
cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
}
ret = dmaengine_slave_config(chan, &cfg);
if (ret) {