spi: spi-s3c64xx: swap s3c64xx_spi_set_cs() and s3c64xx_enable_datapath()

[ Upstream commit 581e2b41977dfc2d4c26c8e976f89c43bb92f9bf ]

Fix issues with DMA transfers bigger than 512 bytes on Exynos3250. Without
the patches such transfers fail to complete. This solution to the problem
is found in the vendor kernel for ARTIK5 boards based on Exynos3250.

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Łukasz Stelmach <l.stelmach@samsung.com>
Link: https://lore.kernel.org/r/20201002122243.26849-2-l.stelmach@samsung.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index cf67ea60dc0ed191c03db50143dbaa8e99d6f81f..fb5e2ba4b6b977da69fb14ea8824ffa5fb6515ce 100644 (file)
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -678,11 +678,11 @@ static int s3c64xx_spi_transfer_one(struct spi_master *master,
                sdd->state &= ~RXBUSY;
                sdd->state &= ~TXBUSY;
 
-               s3c64xx_enable_datapath(sdd, xfer, use_dma);
-
                /* Start the signals */
                s3c64xx_spi_set_cs(spi, true);
 
+               s3c64xx_enable_datapath(sdd, xfer, use_dma);
+
                spin_unlock_irqrestore(&sdd->lock, flags);
 
                if (use_dma)