diff options
Diffstat (limited to 'target/linux/generic/pending-5.4')
| -rw-r--r-- | target/linux/generic/pending-5.4/481-mtd-spi-nor-rework-broken-flash-reset-support.patch | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/target/linux/generic/pending-5.4/481-mtd-spi-nor-rework-broken-flash-reset-support.patch b/target/linux/generic/pending-5.4/481-mtd-spi-nor-rework-broken-flash-reset-support.patch new file mode 100644 index 0000000000..b2f73a5cbd --- /dev/null +++ b/target/linux/generic/pending-5.4/481-mtd-spi-nor-rework-broken-flash-reset-support.patch @@ -0,0 +1,167 @@ +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/spi-nor.c ++++ b/drivers/mtd/spi-nor/spi-nor.c +@@ -616,6 +616,22 @@ static void spi_nor_set_4byte_opcodes(st + } + } + ++static 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(nor, addr_width == 4); ++} ++ + static int macronix_set_4byte(struct spi_nor *nor, bool enable) + { + if (nor->spimem) { +@@ -1259,6 +1275,10 @@ 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; +@@ -1315,6 +1335,7 @@ static int spi_nor_erase(struct mtd_info + write_disable(nor); + + erase_err: ++ spi_nor_check_set_addr_width(nor, 0); + spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_ERASE); + + return ret; +@@ -1621,7 +1642,9 @@ 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, SPI_NOR_OPS_UNLOCK); + return ret; +@@ -1636,7 +1659,9 @@ 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, SPI_NOR_OPS_LOCK); + return ret; +@@ -1651,7 +1676,9 @@ 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, SPI_NOR_OPS_LOCK); + return ret; +@@ -2557,6 +2584,10 @@ 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; + +@@ -2580,6 +2611,7 @@ 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, SPI_NOR_OPS_READ); + return ret; + } +@@ -2597,6 +2629,10 @@ 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; ++ + write_enable(nor); + + nor->sst_write_second = false; +@@ -2659,6 +2695,7 @@ static int sst_write(struct mtd_info *mt + } + sst_write_err: + *retlen += actual; ++ spi_nor_check_set_addr_width(nor, 0); + spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_WRITE); + return ret; + } +@@ -2681,6 +2718,10 @@ 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; +@@ -2720,6 +2761,7 @@ static int spi_nor_write(struct mtd_info + } + + write_err: ++ spi_nor_check_set_addr_width(nor, 0); + spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_WRITE); + return ret; + } +@@ -4726,9 +4768,13 @@ 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(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(nor, true); ++ } + } + + return 0; |