kernel: 5.10: drop broken-flash-reset patch

Flash accessing instruction templates are determined during probe since
v5.6 for spimem-dirmap support in spi-nor driver in upstream commit:
df5c21002cf4 ("mtd: spi-nor: use spi-mem dirmap API")
As a result, changing bus_width on the fly doesn't work anymore and this
patch will cause executing spi-mem ops with 3-byte address on 16-32M
flash area.
We can't easily revert that behavioral change upstream so drop the patch
to prevent u-boot and eeprom from being erased.

Fixes: b10d6044("kernel: add linux 5.10 support")
Reported-by: Frank Di Matteo <dimatto@foxmail.com>
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

target/linux/generic/pending-5.10/481-mtd-spi-nor-rework-broken-flash-reset-support.patch

-From ea92cbb50a78404e29de2cc3999a240615ffb1c8 Mon Sep 17 00:00:00 2001
-From: Chuanhong Guo <gch981213@gmail.com>
-Date: Mon, 6 Apr 2020 17:58:48 +0800
-Subject: [PATCH] mtd: spi-nor: rework broken-flash-reset support
-
-Instead of resetting flash to 3B address on remove hook, this
-implementation only enters 4B mode when needed, which prevents
-more unexpected reboot stuck. This implementation makes it only
-break when a kernel panic happens during flash operation on 16M+
-areas.
-*OpenWrt only*: silent broken-flash-reset warning. We are not dealing
-with vendors and it's unpleasant for users to se that unnecessary
-and long WARN_ON print.
-
-Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
----
- drivers/mtd/spi-nor/spi-nor.c | 52 +++++++++++++++++++++++++++++++++--
- 1 file changed, 49 insertions(+), 3 deletions(-)
-
---- a/drivers/mtd/spi-nor/core.c
-+++ b/drivers/mtd/spi-nor/core.c
-@@ -1449,6 +1449,23 @@ destroy_erase_cmd_list:
- 	return ret;
- }
- 
-+int spi_nor_check_set_addr_width(struct spi_nor *nor, loff_t addr)
-+{
-+	u8 addr_width;
-+
-+	if ((nor->flags & (SNOR_F_4B_OPCODES | SNOR_F_BROKEN_RESET)) !=
-+	    SNOR_F_BROKEN_RESET)
-+		return 0;
-+
-+	addr_width = addr & 0xff000000 ? 4 : 3;
-+	if (nor->addr_width == addr_width)
-+		return 0;
-+
-+	nor->addr_width = addr_width;
-+
-+	return nor->params->set_4byte_addr_mode(nor, addr_width == 4);
-+}
-+
- /*
-  * Erase an address range on the nor chip.  The address range may extend
-  * one or more erase sectors.  Return an error is there is a problem erasing.
-@@ -1476,6 +1493,10 @@ static int spi_nor_erase(struct mtd_info
- 	if (ret)
- 		return ret;
- 
-+	ret = spi_nor_check_set_addr_width(nor, instr->addr + instr->len);
-+	if (ret < 0)
-+		return ret;
-+
- 	/* whole-chip erase? */
- 	if (len == mtd->size && !(nor->flags & SNOR_F_NO_OP_CHIP_ERASE)) {
- 		unsigned long timeout;
-@@ -1535,6 +1556,7 @@ static int spi_nor_erase(struct mtd_info
- 	ret = spi_nor_write_disable(nor);
- 
- erase_err:
-+	spi_nor_check_set_addr_width(nor, 0);
- 	spi_nor_unlock_and_unprep(nor);
- 
- 	return ret;
-@@ -1874,7 +1896,9 @@ static int spi_nor_lock(struct mtd_info
- 	if (ret)
- 		return ret;
- 
-+	spi_nor_check_set_addr_width(nor, ofs + len);
- 	ret = nor->params->locking_ops->lock(nor, ofs, len);
-+	spi_nor_check_set_addr_width(nor, 0);
- 
- 	spi_nor_unlock_and_unprep(nor);
- 	return ret;
-@@ -1889,7 +1913,9 @@ static int spi_nor_unlock(struct mtd_inf
- 	if (ret)
- 		return ret;
- 
-+	spi_nor_check_set_addr_width(nor, ofs + len);
- 	ret = nor->params->locking_ops->unlock(nor, ofs, len);
-+	spi_nor_check_set_addr_width(nor, 0);
- 
- 	spi_nor_unlock_and_unprep(nor);
- 	return ret;
-@@ -1904,7 +1930,9 @@ static int spi_nor_is_locked(struct mtd_
- 	if (ret)
- 		return ret;
- 
-+	spi_nor_check_set_addr_width(nor, ofs + len);
- 	ret = nor->params->locking_ops->is_locked(nor, ofs, len);
-+	spi_nor_check_set_addr_width(nor, 0);
- 
- 	spi_nor_unlock_and_unprep(nor);
- 	return ret;
-@@ -2097,6 +2125,10 @@ static int spi_nor_read(struct mtd_info
- 	if (ret)
- 		return ret;
- 
-+	ret = spi_nor_check_set_addr_width(nor, from + len);
-+	if (ret < 0)
-+		return ret;
-+
- 	while (len) {
- 		loff_t addr = from;
- 
-@@ -2120,6 +2152,7 @@ static int spi_nor_read(struct mtd_info
- 	ret = 0;
- 
- read_err:
-+	spi_nor_check_set_addr_width(nor, 0);
- 	spi_nor_unlock_and_unprep(nor);
- 	return ret;
- }
-@@ -2142,6 +2175,10 @@ static int spi_nor_write(struct mtd_info
- 	if (ret)
- 		return ret;
- 
-+	ret = spi_nor_check_set_addr_width(nor, to + len);
-+	if (ret < 0)
-+		return ret;
-+
- 	for (i = 0; i < len; ) {
- 		ssize_t written;
- 		loff_t addr = to + i;
-@@ -2184,6 +2221,7 @@ static int spi_nor_write(struct mtd_info
- 	}
- 
- write_err:
-+	spi_nor_check_set_addr_width(nor, 0);
- 	spi_nor_unlock_and_unprep(nor);
- 	return ret;
- }
-@@ -2983,9 +3021,13 @@ static int spi_nor_init(struct spi_nor *
- 		 * reboots (e.g., crashes). Warn the user (or hopefully, system
- 		 * designer) that this is bad.
- 		 */
--		WARN_ONCE(nor->flags & SNOR_F_BROKEN_RESET,
--			  "enabling reset hack; may not recover from unexpected reboots\n");
--		nor->params->set_4byte_addr_mode(nor, true);
-+		if (nor->flags & SNOR_F_BROKEN_RESET) {
-+			dev_warn(nor->dev,
-+				"enabling reset hack; may not recover from unexpected reboots\n");
-+			nor->addr_width = 3;
-+		} else {
-+			nor->params->set_4byte_addr_mode(nor, true);
-+		}
- 	}
- 
- 	return 0;
---- a/drivers/mtd/spi-nor/core.h
-+++ b/drivers/mtd/spi-nor/core.h
-@@ -400,6 +400,7 @@ extern const struct spi_nor_manufacturer
- extern const struct spi_nor_manufacturer spi_nor_xmc;
- extern const struct spi_nor_manufacturer spi_nor_xtx;
- 
-+int spi_nor_check_set_addr_width(struct spi_nor *nor, loff_t addr);
- int spi_nor_write_enable(struct spi_nor *nor);
- int spi_nor_write_disable(struct spi_nor *nor);
- int spi_nor_set_4byte_addr_mode(struct spi_nor *nor, bool enable);
---- a/drivers/mtd/spi-nor/sst.c
-+++ b/drivers/mtd/spi-nor/sst.c
-@@ -55,6 +55,10 @@ static int sst_write(struct mtd_info *mt
- 	if (ret)
- 		return ret;
- 
-+	ret = spi_nor_check_set_addr_width(nor, to + len);
-+	if (ret < 0)
-+		return ret;
-+
- 	ret = spi_nor_write_enable(nor);
- 	if (ret)
- 		goto out;
-@@ -124,6 +128,7 @@ static int sst_write(struct mtd_info *mt
- 	}
- out:
- 	*retlen += actual;
-+	spi_nor_check_set_addr_width(nor, 0);
- 	spi_nor_unlock_and_unprep(nor);
- 	return ret;
- }

target/linux/ramips/patches-5.10/405-mtd-spi-nor-Add-support-for-BoHong-bh25q128as.patch

@@ -55,7 +55,7 @@ Signed-off-by: David Bauer <mail@david-bauer.net>
 +};
 --- a/drivers/mtd/spi-nor/core.c
 +++ b/drivers/mtd/spi-nor/core.c
-@@ -2040,6 +2040,7 @@ int spi_nor_sr2_bit7_quad_enable(struct
+@@ -2012,6 +2012,7 @@ int spi_nor_sr2_bit7_quad_enable(struct
  
  static const struct spi_nor_manufacturer *manufacturers[] = {
  	&spi_nor_atmel,