linux-kernel - [PATCH v11 11/14] mtd: spi-nor: core: disable Octal DTR mode on suspend.

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Message-Id: <20200723131203.40916-12-me@yadavpratyush.com>
Date:   Thu, 23 Jul 2020 18:42:00 +0530
From:   Pratyush Yadav <me@...avpratyush.com>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Sekhar Nori <nsekhar@...com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Pratyush Yadav <p.yadav@...com>,
        Pratyush Yadav <me@...avpratyush.com>
Subject: [PATCH v11 11/14] mtd: spi-nor: core: disable Octal DTR mode on suspend.

From: Pratyush Yadav <p.yadav@...com>

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/core.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index f55c062a7bd5..a263196d970f 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -3193,6 +3193,23 @@ 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)
 {
@@ -3387,6 +3404,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	mtd->size = nor->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) {
-- 
2.27.0