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From:   Pratyush Yadav <p.yadav@ti.com>
To:     Tudor Ambarus <tudor.ambarus@microchip.com>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Mark Brown <broonie@kernel.org>,
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        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Ludovic Desroches <ludovic.desroches@microchip.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Michal Simek <michal.simek@xilinx.com>,
        <linux-mtd@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
        <linux-spi@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
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CC:     Pratyush Yadav <p.yadav@ti.com>, Sekhar Nori <nsekhar@ti.com>,
        Boris Brezillon <boris.brezillon@collabora.com>,
        Mason Yang <masonccyang@mxic.com.tw>
Subject: [PATCH v8 04/19] spi: spi-mtk-nor: reject DTR ops
Date:   Sat, 23 May 2020 04:10:27 +0530
Message-ID: <20200522224042.29970-5-p.yadav@ti.com>
In-Reply-To: <20200522224042.29970-1-p.yadav@ti.com>
References: <20200522224042.29970-1-p.yadav@ti.com>
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Double Transfer Rate (DTR) ops are added in spi-mem. But this controller
doesn't support DTR transactions. Since we don't use the default
supports_op(), which rejects all DTR ops, do that explicitly in our
supports_op().

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/spi/spi-mtk-nor.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
index d5f393871619..b08d8e9a8ee9 100644
--- a/drivers/spi/spi-mtk-nor.c
+++ b/drivers/spi/spi-mtk-nor.c
@@ -211,6 +211,12 @@ static bool mtk_nor_supports_op(struct spi_mem *mem,
 	if (op->cmd.buswidth != 1)
 		return false;
 
+	/* DTR ops not supported. */
+	if (op->cmd.dtr || op->addr.dtr || op->dummy.dtr || op->data.dtr)
+		return false;
+	if (op->cmd.nbytes != 1)
+		return false;
+
 	if ((op->addr.nbytes == 3) || (op->addr.nbytes == 4)) {
 		if ((op->data.dir == SPI_MEM_DATA_IN) && mtk_nor_match_read(op))
 			return true;
-- 
2.26.2