kernel: copy kernel 4.19 code to 5.4

No changes were done to the patches while coping them. Currently they do
not apply on top of kernel 5.4.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 56 insertions, 0 deletions

diff --git a/target/linux/generic/pending-5.4/470-mtd-spi-nor-support-limiting-4K-sectors-support-base.patch b/target/linux/generic/pending-5.4/470-mtd-spi-nor-support-limiting-4K-sectors-support-base.patch
new file mode 100644
index 0000000000..12d785856a
--- /dev/null
+++ b/target/linux/generic/pending-5.4/470-mtd-spi-nor-support-limiting-4K-sectors-support-base.patch
@@ -0,0 +1,56 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Sat, 4 Nov 2017 07:40:23 +0100
+Subject: [PATCH] mtd: spi-nor: support limiting 4K sectors support based on
+ flash size
+
+Some devices need 4K sectors to be able to deal with small flash chips.
+For instance, w25x05 is 64 KiB in size, and without 4K sectors, the
+entire chip is just one erase block.
+On bigger flash chip sizes, using 4K sectors can significantly slow down
+many operations, including using a writable filesystem. There are several
+platforms where it makes sense to use a single kernel on both kinds of
+devices.
+
+To support this properly, allow configuring an upper flash chip size
+limit for 4K sectors support.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/mtd/spi-nor/Kconfig
++++ b/drivers/mtd/spi-nor/Kconfig
+@@ -39,6 +39,17 @@ config SPI_ASPEED_SMC
+ 	  and support for the SPI flash memory controller (SPI) for
+ 	  the host firmware. The implementation only supports SPI NOR.
+ 
++config MTD_SPI_NOR_USE_4K_SECTORS_LIMIT
++	int "Maximum flash chip size to use 4K sectors on (in KiB)"
++	depends on MTD_SPI_NOR_USE_4K_SECTORS
++	default "4096"
++	help
++	  There are many flash chips that support 4K sectors, but are so large
++	  that using them significantly slows down writing large amounts of
++	  data or using a writable filesystem.
++	  Any flash chip larger than the size specified in this option will
++	  not use 4K sectors.
++
+ config SPI_ATMEL_QUADSPI
+ 	tristate "Atmel Quad SPI Controller"
+ 	depends on ARCH_AT91 || (ARM && COMPILE_TEST && !ARCH_EBSA110)
+--- a/drivers/mtd/spi-nor/spi-nor.c
++++ b/drivers/mtd/spi-nor/spi-nor.c
+@@ -2649,10 +2649,12 @@ static int spi_nor_select_erase(struct s
+ 
+ #ifdef CONFIG_MTD_SPI_NOR_USE_4K_SECTORS
+ 	/* prefer "small sector" erase if possible */
+-	if (info->flags & SECT_4K) {
++	if ((info->flags & SECT_4K) && (mtd->size <=
++	    CONFIG_MTD_SPI_NOR_USE_4K_SECTORS_LIMIT * 1024)) {
+ 		nor->erase_opcode = SPINOR_OP_BE_4K;
+ 		mtd->erasesize = 4096;
+-	} else if (info->flags & SECT_4K_PMC) {
++	} else if ((info->flags & SECT_4K_PMC) && (mtd->size <=
++		   CONFIG_MTD_SPI_NOR_USE_4K_SECTORS_LIMIT * 1024)) {
+ 		nor->erase_opcode = SPINOR_OP_BE_4K_PMC;
+ 		mtd->erasesize = 4096;
+ 	} else