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SPI 32MB soft reboot patch for ramips

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coolsnowwolf 2018-11-11 01:51:08 +08:00
parent 366ad4ca67
commit 3bb61a1c01
1 changed files with 34 additions and 0 deletions
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34
target/linux/ramips/patches-4.14/999-fix-m25p-shutdown.patch Normal file
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@ -0,0 +1,34 @@
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 24e1ea3..b1ff69a 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -313,6 +313,21 @@ static int m25p_remove(struct spi_device *spi)
return mtd_device_unregister(&flash->spi_nor.mtd);
}
+static void m25p_shutdown(struct spi_device *spi)
+{
+ struct m25p *flash = spi_get_drvdata(spi);
+
+ if ((&flash->spi_nor)->addr_width > 3) {
+ printk(KERN_INFO "m25p80: exit 4-byte address mode\n");
+ flash->command[0] = SPINOR_OP_EX4B; // exit 4-byte address mode: 0xe9
+ spi_write(flash->spi, flash->command, 1);
+ flash->command[0] = 0x66; // enable reset
+ spi_write(flash->spi, flash->command, 1);
+ flash->command[0] = 0x99; // reset
+ spi_write(flash->spi, flash->command, 1);
+ }
+}
+
/*
* Do NOT add to this array without reading the following:
*
@@ -387,6 +402,7 @@ 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.