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Commit a30b95a7 authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by Mark Brown
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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 9c5de2c1 ("spi: rspi: Remove
unused 16-bit DMA support")).

Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 43937455

drivers/spi/spi-rspi.c

+5 −2
Original line number Diff line number Diff line
@@ -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) {