From 1b21ae112e48306f618fd2e47fd2fce719a79475 Mon Sep 17 00:00:00 2001 From: coolsnowwolf Date: Sun, 28 Oct 2018 13:18:54 +0800 Subject: [PATCH] add soft reboot support for mtk762x 32MB spi flash --- .../patches-4.14/999-fix-m25p-shutdown.patch | 34 +++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 target/linux/ramips/patches-4.14/999-fix-m25p-shutdown.patch diff --git a/target/linux/ramips/patches-4.14/999-fix-m25p-shutdown.patch b/target/linux/ramips/patches-4.14/999-fix-m25p-shutdown.patch new file mode 100644 index 000000000..0b825d61e --- /dev/null +++ b/target/linux/ramips/patches-4.14/999-fix-m25p-shutdown.patch @@ -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.