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 7b7151ec14c8af36e7f51c98ebad7a091747443d..322f75f89c7138faf4489ed4d1fbf56fd17c2dfe 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)