linux-kernel - [PATCH v3 11/12] mtd: spi-nor: Disable Octal DTR mode on suspend.

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Date:   Fri, 13 Mar 2020 21:16:44 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Mark Brown <broonie@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>
CC:     Pratyush Yadav <p.yadav@...com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-spi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Sekhar Nori <nsekhar@...com>
Subject: [PATCH v3 11/12] mtd: spi-nor: Disable Octal DTR mode on suspend.

On resume, the init procedure will be run that will re-enable it.

Signed-off-by: Pratyush Yadav <p.yadav@...com>
---
 drivers/mtd/spi-nor/spi-nor.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index fcc087ff5148..32f7ecbc38d4 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -5379,6 +5379,23 @@ static void spi_nor_soft_reset(struct spi_nor *nor)
 	usleep_range(SPI_NOR_SRST_SLEEP_MIN, SPI_NOR_SRST_SLEEP_MAX);
 }
 
+/* mtd suspend handler */
+static int spi_nor_suspend(struct mtd_info *mtd)
+{
+	struct spi_nor *nor = mtd_to_spi_nor(mtd);
+	struct device *dev = nor->dev;
+	int ret;
+
+	/* Disable octal DTR mode if we enabled it. */
+	ret = spi_nor_octal_dtr_enable(nor, false);
+	if (ret) {
+		dev_err(dev, "suspend() failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+
 /* mtd resume handler */
 static void spi_nor_resume(struct mtd_info *mtd)
 {
@@ -5564,6 +5581,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	mtd->size = params->size;
 	mtd->_erase = spi_nor_erase;
 	mtd->_read = spi_nor_read;
+	mtd->_suspend = spi_nor_suspend;
 	mtd->_resume = spi_nor_resume;
 
 	if (nor->params.locking_ops) {
-- 
2.25.0