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 9c5de2c1754c2bb3c69c4d7bf0d0edc0a61d8232 ("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>
(cherry picked from commit a30b95a7d81cfc3442beb5a9635f22b19c97bbfc)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index aa1c6a8..6a4eb2d 100644 (file)
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -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) {