linux-kernel - [PATCH 2/2] mtd: m25p80: restore the addressing mode when stop using the flash

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Message-ID: <20171124100848.1828-3-Zhiqiang.Hou@nxp.com>
Date:   Fri, 24 Nov 2017 18:08:48 +0800
From:   Zhiqiang Hou <Zhiqiang.Hou@....com>
To:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <computersforpeace@...il.com>, <dwmw2@...radead.org>,
        <boris.brezillon@...e-electrons.com>, <marek.vasut@...il.com>,
        <richard@....at>, <cyrille.pitchen@...ev4u.fr>
CC:     Hou Zhiqiang <Zhiqiang.Hou@....com>
Subject: [PATCH 2/2] mtd: m25p80: restore the addressing mode when stop using the flash

From: Hou Zhiqiang <Zhiqiang.Hou@....com>

Add .shutdown function to restore the addressing mode in reboot
process, and add the same operation to the .remove function.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
---
 drivers/mtd/devices/m25p80.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index dbe6a1de2bb8..867bd2d5a267 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -307,10 +307,17 @@ static int m25p_remove(struct spi_device *spi)
 {
 	struct m25p	*flash = spi_get_drvdata(spi);
 
+	spi_nor_restore_addr_mode(&flash->spi_nor);
 	/* Clean up MTD stuff. */
 	return mtd_device_unregister(&flash->spi_nor.mtd);
 }
 
+static void m25p_shutdown(struct spi_device *spi)
+{
+	struct m25p *flash = spi_get_drvdata(spi);
+
+	spi_nor_restore_addr_mode(&flash->spi_nor);
+}
 /*
  * Do NOT add to this array without reading the following:
  *
@@ -386,6 +393,7 @@ static struct spi_driver m25p80_driver = {
 	.id_table	= m25p_ids,
 	.probe	= m25p_probe,
 	.remove	= m25p_remove,
+	.shutdown	= m25p_shutdown,
 
 	/* REVISIT: many of these chips have deep power-down modes, which
 	 * should clearly be entered on suspend() to minimize power use.
-- 
2.14.1