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authorDaniel Golle <daniel@makrotopia.org>2018-06-07 01:51:58 +0200
committerDaniel Golle <daniel@makrotopia.org>2018-06-07 02:34:13 +0200
commit8796680277f4b231386fbc6e8a1ccae91d9fcbe8 (patch)
tree7b7cc964fec7ef442f0a2fdaba4ae0ce3970583f /target
parent1bbe813db0bb8dc65b8ed7740cf7f35a81b8ba0e (diff)
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ramips: fix reboot with W25Q256 with 4-address-mode enabled
Some board vendors actually changed the loader to expect the chip to come up in 4-address-mode and flipped the ADP bit in the flash chip's configuration register which makes it come up in 4-address-mode. Hence it doesn't make sense to avoid switching to 4-address-mode on those boards but the opposite as otherwise reboot hangs eg. on the WrtNode2 boards. Fix this by checking the ADP register and only using SPI_NOR_4B_READ_OP on chips which have ADP==0 (come up in 3-byte mode). See also datasheet section 7.1.11 Power Up Address Mode (ADP) Fixes: 22d982ea0 ("ramips: add support for switching between 3-byte and 4-byte addressing on w25q256 flash") Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Diffstat (limited to 'target')
-rw-r--r--target/linux/ramips/patches-4.14/0054-mtd-spi-nor-w25q256-respect-default-mode.patch73
1 files changed, 73 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-4.14/0054-mtd-spi-nor-w25q256-respect-default-mode.patch b/target/linux/ramips/patches-4.14/0054-mtd-spi-nor-w25q256-respect-default-mode.patch
new file mode 100644
index 0000000000..568d61db91
--- /dev/null
+++ b/target/linux/ramips/patches-4.14/0054-mtd-spi-nor-w25q256-respect-default-mode.patch
@@ -0,0 +1,73 @@
+--- a/drivers/mtd/spi-nor/spi-nor.c
++++ b/drivers/mtd/spi-nor/spi-nor.c
+@@ -142,20 +142,29 @@ static int read_fsr(struct spi_nor *nor)
+ * location. Return the configuration register value.
+ * Returns negative if error occurred.
+ */
+-static int read_cr(struct spi_nor *nor)
++static int _read_cr(struct spi_nor *nor, u8 reg)
+ {
+ int ret;
+ u8 val;
+
+- ret = nor->read_reg(nor, SPINOR_OP_RDCR, &val, 1);
++ ret = nor->read_reg(nor, reg, &val, 1);
+ if (ret < 0) {
+- dev_err(nor->dev, "error %d reading CR\n", ret);
++ dev_err(nor->dev, "error %d reading %s\n", ret,
++ (reg==SPINOR_OP_RDCR)?"CR":"XCR");
+ return ret;
+ }
+
+ return val;
+ }
+
++static inline int read_cr(struct spi_nor *nor) {
++ return _read_cr(nor, SPINOR_OP_RDCR);
++}
++
++static inline int read_xcr(struct spi_nor *nor) {
++ return _read_cr(nor, SPINOR_OP_RDXCR);
++}
++
+ /*
+ * Write status register 1 byte
+ * Returns negative if error occurred.
+@@ -2878,9 +2887,16 @@ int spi_nor_scan(struct spi_nor *nor, co
+ } else if (mtd->size > 0x1000000) {
+ /* enable 4-byte addressing if the device exceeds 16MiB */
+ nor->addr_width = 4;
+- if (info->flags & SPI_NOR_4B_READ_OP)
+- spi_nor_set_4byte_read(nor, info);
+- else if (JEDEC_MFR(info) == SNOR_MFR_SPANSION ||
++ if (info->flags & SPI_NOR_4B_READ_OP) {
++ if (JEDEC_MFR(info) == SNOR_MFR_WINBOND) {
++ ret = read_xcr(nor);
++ if (!(ret > 0 && (ret & XCR_DEF_4B_ADDR_MODE)))
++ spi_nor_set_4byte_read(nor, info);
++ else
++ set_4byte(nor, info, 1);
++ } else
++ spi_nor_set_4byte_read(nor, info);
++ } else if (JEDEC_MFR(info) == SNOR_MFR_SPANSION ||
+ info->flags & SPI_NOR_4B_OPCODES)
+ spi_nor_set_4byte_opcodes(nor, info);
+ else
+--- a/include/linux/mtd/spi-nor.h
++++ b/include/linux/mtd/spi-nor.h
+@@ -103,6 +103,7 @@
+ #define SPINOR_OP_EN4B 0xb7 /* Enter 4-byte mode */
+ #define SPINOR_OP_EX4B 0xe9 /* Exit 4-byte mode */
+ #define SPINOR_OP_WREAR 0xc5 /* Write extended address register */
++#define SPINOR_OP_RDXCR 0x15 /* Read extended configuration register */
+
+ /* Used for Spansion flashes only. */
+ #define SPINOR_OP_BRWR 0x17 /* Bank register write */
+@@ -135,6 +136,7 @@
+
+ /* Configuration Register bits. */
+ #define CR_QUAD_EN_SPAN BIT(1) /* Spansion Quad I/O */
++#define XCR_DEF_4B_ADDR_MODE BIT(1) /* Winbond 4B mode default */
+
+ /* Status Register 2 bits. */
+ #define SR2_QUAD_EN_BIT7 BIT(7)