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[16/18] spi: rspi: Add DMA support for RSPI on RZ/A1H

Message ID 1401716301-29612-17-git-send-email-geert+renesas@glider.be (mailing list archive)
State Accepted
Commit e7fb921d9f62df05240ad1a74b5a0f623e503c9c
Headers show

Commit Message

Geert Uytterhoeven June 2, 2014, 1:38 p.m. UTC 
Enable DMA support for RSPI on r7s72100 (RZ/A1H).

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
This is untested, due to lack of DMA integration code on r7s72100/genmai.
---
 drivers/spi/spi-rspi.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index bec81470dd9c..4bc4138e002b 100644
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -625,6 +625,9 @@  static int rspi_rz_transfer_one(struct spi_master *master,
 
 	rspi_rz_receive_init(rspi);
 
+	if (master->can_dma && __rspi_can_dma(rspi, xfer))
+		return rspi_dma_transfer(rspi, &xfer->tx_sg, &xfer->rx_sg);
+
 	ret = rspi_pio_transfer(rspi, xfer->tx_buf, xfer->rx_buf, xfer->len);
 	if (ret < 0)
 		return ret;