linux-kernel - [PATCH 1/9] spi: atmel-quadspi: optimize qspi init

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Message-ID: <20190130150818.24902-2-tudor.ambarus@microchip.com>
Date:   Wed, 30 Jan 2019 15:08:29 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <broonie@...nel.org>, <Nicolas.Ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <Ludovic.Desroches@...rochip.com>
CC:     <linux-spi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
        <Tudor.Ambarus@...rochip.com>
Subject: [PATCH 1/9] spi: atmel-quadspi: optimize qspi init

From: Tudor Ambarus <tudor.ambarus@...rochip.com>

Set the QSPI controller in Serial Memory Mode at init and not
at each exec_op() call.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/spi/atmel-quadspi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c
index ddc712410812..f79b17792a11 100644
--- a/drivers/spi/atmel-quadspi.c
+++ b/drivers/spi/atmel-quadspi.c
@@ -238,8 +238,6 @@ static int atmel_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
 	icr = QSPI_ICR_INST(op->cmd.opcode);
 	ifr = QSPI_IFR_INSTEN;
 
-	qspi_writel(aq, QSPI_MR, QSPI_MR_SMM);
-
 	mode = find_mode(op);
 	if (mode < 0)
 		return -ENOTSUPP;
@@ -381,6 +379,9 @@ static int atmel_qspi_init(struct atmel_qspi *aq)
 	/* Reset the QSPI controller */
 	qspi_writel(aq, QSPI_CR, QSPI_CR_SWRST);
 
+	/* Set the QSPI controller in Serial Memory Mode */
+	qspi_writel(aq, QSPI_MR, QSPI_MR_SMM);
+
 	/* Enable the QSPI controller */
 	qspi_writel(aq, QSPI_CR, QSPI_CR_QSPIEN);
 
-- 
2.9.5