kernel: add bcm47xxpart patches sent for 4.5 merge window

This replaces old bcm53xx patch for scanning whole flash and makes
bcm47xxpart compatible with NAND.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 47800

1 files changed, 97 insertions, 0 deletions

diff --git a/target/linux/generic/patches-4.4/144-mtd-bcm47xxpart-don-t-fail-because-of-bit-flips.patch b/target/linux/generic/patches-4.4/144-mtd-bcm47xxpart-don-t-fail-because-of-bit-flips.patch
new file mode 100644
index 0000000000..f9e81f9395
--- /dev/null
+++ b/target/linux/generic/patches-4.4/144-mtd-bcm47xxpart-don-t-fail-because-of-bit-flips.patch
@@ -0,0 +1,97 @@
+From dfe4b4c732365fc1d83c2d2fd9cc18054ae850b7 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
+Date: Sun, 6 Dec 2015 11:24:05 +0100
+Subject: [PATCH] mtd: bcm47xxpart: don't fail because of bit-flips
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Bit-flip errors may occur on NAND flashes and are harmless. Handle them
+gracefully as read content is still reliable and can be parsed.
+
+Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
+---
+ drivers/mtd/bcm47xxpart.c | 38 ++++++++++++++++++++++----------------
+ 1 file changed, 22 insertions(+), 16 deletions(-)
+
+diff --git a/drivers/mtd/bcm47xxpart.c b/drivers/mtd/bcm47xxpart.c
+index 4450e74..1ab3451 100644
+--- a/drivers/mtd/bcm47xxpart.c
++++ b/drivers/mtd/bcm47xxpart.c
+@@ -66,11 +66,13 @@ static const char *bcm47xxpart_trx_data_part_name(struct mtd_info *master,
+ {
+ 	uint32_t buf;
+ 	size_t bytes_read;
++	int err;
+ 
+-	if (mtd_read(master, offset, sizeof(buf), &bytes_read,
+-		     (uint8_t *)&buf) < 0) {
+-		pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
+-			offset);
++	err  = mtd_read(master, offset, sizeof(buf), &bytes_read,
++			(uint8_t *)&buf);
++	if (err && !mtd_is_bitflip(err)) {
++		pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",
++			offset, err);
+ 		goto out_default;
+ 	}
+ 
+@@ -95,6 +97,7 @@ static int bcm47xxpart_parse(struct mtd_info *master,
+ 	int trx_part = -1;
+ 	int last_trx_part = -1;
+ 	int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
++	int err;
+ 
+ 	/*
+ 	 * Some really old flashes (like AT45DB*) had smaller erasesize-s, but
+@@ -128,10 +131,11 @@ static int bcm47xxpart_parse(struct mtd_info *master,
+ 		}
+ 
+ 		/* Read beginning of the block */
+-		if (mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,
+-			     &bytes_read, (uint8_t *)buf) < 0) {
+-			pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
+-			       offset);
++		err = mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,
++			       &bytes_read, (uint8_t *)buf);
++		if (err && !mtd_is_bitflip(err)) {
++			pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",
++			       offset, err);
+ 			continue;
+ 		}
+ 
+@@ -254,10 +258,11 @@ static int bcm47xxpart_parse(struct mtd_info *master,
+ 		}
+ 
+ 		/* Read middle of the block */
+-		if (mtd_read(master, offset + 0x8000, 0x4,
+-			     &bytes_read, (uint8_t *)buf) < 0) {
+-			pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
+-			       offset);
++		err = mtd_read(master, offset + 0x8000, 0x4, &bytes_read,
++			       (uint8_t *)buf);
++		if (err && !mtd_is_bitflip(err)) {
++			pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",
++			       offset, err);
+ 			continue;
+ 		}
+ 
+@@ -277,10 +282,11 @@ static int bcm47xxpart_parse(struct mtd_info *master,
+ 		}
+ 
+ 		offset = master->size - possible_nvram_sizes[i];
+-		if (mtd_read(master, offset, 0x4, &bytes_read,
+-			     (uint8_t *)buf) < 0) {
+-			pr_err("mtd_read error while reading at offset 0x%X!\n",
+-			       offset);
++		err = mtd_read(master, offset, 0x4, &bytes_read,
++			       (uint8_t *)buf);
++		if (err && !mtd_is_bitflip(err)) {
++			pr_err("mtd_read error while reading (offset 0x%X): %d\n",
++			       offset, err);
+ 			continue;
+ 		}
+ 
+-- 
+1.8.4.5
+