linux-kernel - [PATCH v2 RESEND 1/9] spi: spi-s3c64xx: swap s3c64xx_spi_set_cs() and s3c64xx_enable

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Message-Id: <20201001152148.29747-2-l.stelmach@samsung.com>
Date:   Thu,  1 Oct 2020 17:21:40 +0200
From:   Łukasz Stelmach <l.stelmach@...sung.com>
To:     Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Andi Shyti <andi@...zian.org>, Mark Brown <broonie@...nel.org>,
        linux-spi@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     m.szyprowski@...sung.com, b.zolnierkie@...sung.com,
        Łukasz Stelmach <l.stelmach@...sung.com>
Subject: [PATCH v2 RESEND 1/9] spi: spi-s3c64xx: swap s3c64xx_spi_set_cs()
 and s3c64xx_enable_datapath()

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@...nel.org>
Signed-off-by: Łukasz Stelmach <l.stelmach@...sung.com>
---
 drivers/spi/spi-s3c64xx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 924b24441789..26c7cb79cd78 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -685,11 +685,11 @@ 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)
-- 
2.26.2