gluon/patches/openwrt/0027-kernel-mtd-spi-nor-wait-until-status-register-writes-are-ready.patch

From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Sat, 7 May 2016 00:17:55 +0200
Subject: kernel: mtd: spi-nor: wait until status register writes are ready

diff --git a/target/linux/generic/patches-3.18/094-0001-mtd-spi-nor-wait-until-lock-unlock-operations-are-re.patch b/target/linux/generic/patches-3.18/094-0001-mtd-spi-nor-wait-until-lock-unlock-operations-are-re.patch
new file mode 100644
index 0000000..2c2e5f3
--- /dev/null
+++ b/target/linux/generic/patches-3.18/094-0001-mtd-spi-nor-wait-until-lock-unlock-operations-are-re.patch
@@ -0,0 +1,66 @@
+From 32321e950d8a237d7e8f3a9b76220007dfa87544 Mon Sep 17 00:00:00 2001
+Message-Id: <32321e950d8a237d7e8f3a9b76220007dfa87544.1462572686.git.mschiffer@universe-factory.net>
+From: =?UTF-8?q?Ezequiel=20Garc=C3=ADa?= <ezequiel@vanguardiasur.com.ar>
+Date: Mon, 28 Dec 2015 17:54:51 -0300
+Subject: [PATCH] mtd: spi-nor: wait until lock/unlock operations are ready
+
+On Micron and Numonyx devices, the status register write command
+(WRSR), raises a work-in-progress bit (WIP) on the status register.
+The datasheets for these devices specify that while the status
+register write is in progress, the status register WIP bit can still
+be read to check the end of the operation.
+
+This commit adds a wait_till_ready call on lock/unlock operations,
+which is required for Micron and Numonyx but should be harmless for
+others. This is needed to prevent applications from issuing erase or
+program operations before the unlock operation is completed.
+
+Reported-by: Stas Sergeev <stsp@list.ru>
+Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
+Signed-off-by: Brian Norris <computersforpeace@gmail.com>
+---
+ drivers/mtd/spi-nor/spi-nor.c | 12 ++++++++++--
+ 1 file changed, 10 insertions(+), 2 deletions(-)
+
+--- a/drivers/mtd/spi-nor/spi-nor.c
++++ b/drivers/mtd/spi-nor/spi-nor.c
+@@ -462,6 +462,7 @@ static int stm_lock(struct spi_nor *nor,
+ 	u8 status_old, status_new;
+ 	u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
+ 	u8 shift = ffs(mask) - 1, pow, val;
++	int ret;
+ 
+ 	status_old = read_sr(nor);
+ 
+@@ -498,7 +499,10 @@ static int stm_lock(struct spi_nor *nor,
+ 		return -EINVAL;
+ 
+ 	write_enable(nor);
+-	return write_sr(nor, status_new);
++	ret = write_sr(nor, status_new);
++	if (ret)
++		return ret;
++	return spi_nor_wait_till_ready(nor);
+ }
+ 
+ /*
+@@ -512,6 +516,7 @@ static int stm_unlock(struct spi_nor *no
+ 	uint8_t status_old, status_new;
+ 	u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
+ 	u8 shift = ffs(mask) - 1, pow, val;
++	int ret;
+ 
+ 	status_old = read_sr(nor);
+ 
+@@ -546,7 +551,10 @@ static int stm_unlock(struct spi_nor *no
+ 		return -EINVAL;
+ 
+ 	write_enable(nor);
+-	return write_sr(nor, status_new);
++	ret = write_sr(nor, status_new);
++	if (ret)
++		return ret;
++	return spi_nor_wait_till_ready(nor);
+ }
+ 
+ /*
diff --git a/target/linux/generic/patches-3.18/094-0002-mtd-spi-nor-wait-for-SR_WIP-to-clear-on-initial-unlo.patch b/target/linux/generic/patches-3.18/094-0002-mtd-spi-nor-wait-for-SR_WIP-to-clear-on-initial-unlo.patch
new file mode 100644
index 0000000..a0573d5
--- /dev/null
+++ b/target/linux/generic/patches-3.18/094-0002-mtd-spi-nor-wait-for-SR_WIP-to-clear-on-initial-unlo.patch
@@ -0,0 +1,33 @@
+From edf891ef9ab773363f8e58022a26d7d31604aed6 Mon Sep 17 00:00:00 2001
+Message-Id: <edf891ef9ab773363f8e58022a26d7d31604aed6.1462572703.git.mschiffer@universe-factory.net>
+From: Brian Norris <computersforpeace@gmail.com>
+Date: Fri, 29 Jan 2016 11:25:30 -0800
+Subject: [PATCH] mtd: spi-nor: wait for SR_WIP to clear on initial unlock
+
+Fixup a piece leftover by commit 32321e950d8a ("mtd: spi-nor: wait until
+lock/unlock operations are ready"). That commit made us wait for the WIP
+bit to settle after lock/unlock operations, but it missed the open-coded
+"unlock" that happens at probe() time.
+
+We should probably have this code utilize the unlock() routines in the
+future, to avoid duplication, but unfortunately, flash which need to be
+unlocked don't all have a proper ->flash_unlock() callback.
+
+Signed-off-by: Brian Norris <computersforpeace@gmail.com>
+Cc: Stas Sergeev <stsp@users.sourceforge.net>
+Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
+Tested-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
+---
+ drivers/mtd/spi-nor/spi-nor.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/drivers/mtd/spi-nor/spi-nor.c
++++ b/drivers/mtd/spi-nor/spi-nor.c
+@@ -1167,6 +1167,7 @@ int spi_nor_scan(struct spi_nor *nor, co
+ 	    JEDEC_MFR(info) == SNOR_MFR_SST) {
+ 		write_enable(nor);
+ 		write_sr(nor, 0);
++		spi_nor_wait_till_ready(nor);
+ 	}
+ 
+ 	if (!mtd->name)