Linux-SPI Archive on lore.kernel.org
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From: "Łukasz Stelmach" <l.stelmach@samsung.com>
To: Kukjin Kim <kgene@kernel.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Tomasz Figa <tomasz.figa@gmail.com>,
	Andi Shyti <andi@etezian.org>, Mark Brown <broonie@kernel.org>,
	linux-spi@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: "Marek Szyprowski" <m.szyprowski@samsung.com>,
	"Bartłomiej Żołnierkiewicz" <b.zolnierkie@samsung.com>,
	"Łukasz Stelmach" <l.stelmach@samsung.com>
Subject: [PATCH v3 1/9] spi: spi-s3c64xx: swap s3c64xx_spi_set_cs() and s3c64xx_enable_datapath()
Date: Fri,  2 Oct 2020 14:22:35 +0200
Message-ID: <20201002122243.26849-2-l.stelmach@samsung.com> (raw)
In-Reply-To: <20201002122243.26849-1-l.stelmach@samsung.com>

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>
---
 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


  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20201002122251eucas1p1a8977c163d7a291829e7cac212d26862@eucas1p1.samsung.com>
2020-10-02 12:22 ` [PATCH v3 0/9] Some fixes for spi-s3c64xx Łukasz Stelmach
     [not found]   ` <CGME20201002122251eucas1p26b59b6a574f78200d0c696dd1aacc140@eucas1p2.samsung.com>
2020-10-02 12:22     ` Łukasz Stelmach [this message]
     [not found]   ` <CGME20201002122251eucas1p235d6797ae11f075a09841be64dc65236@eucas1p2.samsung.com>
2020-10-02 12:22     ` [PATCH v3 2/9] spi: spi-s3s64xx: Add S3C64XX_SPI_QUIRK_CS_AUTO for Exynos3250 Łukasz Stelmach
     [not found]   ` <CGME20201002122252eucas1p1555a9b0df6f2318ab511117be3f65dee@eucas1p1.samsung.com>
2020-10-02 12:22     ` [PATCH v3 3/9] spi: spi-s3c64xx: Check return values Łukasz Stelmach
     [not found]   ` <CGME20201002122252eucas1p1496d896453d21acda6ab83ef9b7f0b8a@eucas1p1.samsung.com>
2020-10-02 12:22     ` [PATCH v3 4/9] spi: spi-s3c64xx: Report more information when errors occur Łukasz Stelmach
     [not found]   ` <CGME20201002122252eucas1p16b24cee16354763e4925f21cf52c6a4d@eucas1p1.samsung.com>
2020-10-02 12:22     ` [PATCH v3 5/9] spi: spi-s3c64xx: Rename S3C64XX_SPI_SLAVE_* to S3C64XX_SPI_CS_* Łukasz Stelmach
     [not found]   ` <CGME20201002122255eucas1p2f361ef66b44801d69e0ee1425571f571@eucas1p2.samsung.com>
2020-10-02 12:22     ` [PATCH v3 6/9] spi: spi-s3c64xx: Fix doc comment for struct s3c64xx_spi_driver_data Łukasz Stelmach
     [not found]   ` <CGME20201002122255eucas1p21976a8ba0566564b79a9dd6f62cd4caf@eucas1p2.samsung.com>
2020-10-02 12:22     ` [PATCH v3 7/9] spi: spi-s3c64xx: Ensure cur_speed holds actual clock value Łukasz Stelmach
2020-10-02 12:31       ` Krzysztof Kozlowski
     [not found]   ` <CGME20201002122255eucas1p2cec6d9cdac111d6f2dc628c7865f7bd5@eucas1p2.samsung.com>
2020-10-02 12:22     ` [PATCH v3 8/9] spi: spi-s3c64xx: Increase transfer timeout Łukasz Stelmach
     [not found]   ` <CGME20201002122256eucas1p10093b3619fbe5f96ae351920329d1626@eucas1p1.samsung.com>
2020-10-02 12:22     ` [PATCH v3 9/9] spi: spi-s3c64xx: Turn on interrupts upon resume Łukasz Stelmach

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