35 lines
1.1 KiB
Diff
35 lines
1.1 KiB
Diff
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
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index 24e1ea3..b1ff69a 100644
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--- a/drivers/mtd/devices/m25p80.c
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+++ b/drivers/mtd/devices/m25p80.c
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@@ -313,6 +313,21 @@ static int m25p_remove(struct spi_device *spi)
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return mtd_device_unregister(&flash->spi_nor.mtd);
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}
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+static void m25p_shutdown(struct spi_device *spi)
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+{
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+ struct m25p *flash = spi_get_drvdata(spi);
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+
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+ if ((&flash->spi_nor)->addr_width > 3) {
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+ printk(KERN_INFO "m25p80: exit 4-byte address mode\n");
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+ flash->command[0] = SPINOR_OP_EX4B; // exit 4-byte address mode: 0xe9
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+ spi_write(flash->spi, flash->command, 1);
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+ flash->command[0] = 0x66; // enable reset
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+ spi_write(flash->spi, flash->command, 1);
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+ flash->command[0] = 0x99; // reset
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+ spi_write(flash->spi, flash->command, 1);
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+ }
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+}
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+
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/*
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* Do NOT add to this array without reading the following:
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*
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@@ -387,6 +402,7 @@ static struct spi_driver m25p80_driver = {
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.id_table = m25p_ids,
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.probe = m25p_probe,
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.remove = m25p_remove,
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+ .shutdown = m25p_shutdown,
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/* REVISIT: many of these chips have deep power-down modes, which
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* should clearly be entered on suspend() to minimize power use.
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