generic: unlock Winbond flash on boot

The underlying issue breaking Spansion flash has been fixed with "mtd: spi-nor:
wait until lock/unlock operations are ready" and "mtd: spi-nor: wait for SR_WIP
to clear on initial unlock", so we can support unlocking for Winbond flash
again.

This is necessary to have writable flash on certain UBNT devices with some
bootloader versions.

Signed-off-by: Matthias Schiffer <[email protected]>

target/linux/generic/pending-4.14/466-Revert-mtd-spi-nor-fix-Spansion-regressions-aliased-.patch

@@ -0,0 +1,37 @@
+From: Matthias Schiffer <[email protected]>
+Date: Tue, 9 Jan 2018 20:41:48 +0100
+Subject: [PATCH] Revert "mtd: spi-nor: fix Spansion regressions (aliased with
+ Winbond)"
+
+This reverts commit 67b9bcd36906e12a15ffec19463afbbd6a41660e.
+
+The underlying issue breaking Spansion flash has been fixed with "mtd: spi-nor:
+wait until lock/unlock operations are ready" and "mtd: spi-nor: wait for SR_WIP
+to clear on initial unlock", so we can support unlocking for Winbond flash
+again.
+
+Signed-off-by: Matthias Schiffer <[email protected]>
+---
+ drivers/mtd/spi-nor/spi-nor.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+--- a/drivers/mtd/spi-nor/spi-nor.c
++++ b/drivers/mtd/spi-nor/spi-nor.c
+@@ -2717,6 +2717,7 @@ int spi_nor_scan(struct spi_nor *nor, co
+ 	    JEDEC_MFR(info) == SNOR_MFR_INTEL ||
+ 	    JEDEC_MFR(info) == SNOR_MFR_MACRONIX ||
+ 	    JEDEC_MFR(info) == SNOR_MFR_SST ||
++	    JEDEC_MFR(info) == SNOR_MFR_WINBOND ||
+ 	    info->flags & SPI_NOR_HAS_LOCK) {
+ 		write_enable(nor);
+ 		write_sr(nor, 0);
+@@ -2735,7 +2736,8 @@ int spi_nor_scan(struct spi_nor *nor, co
+ 
+ 	/* NOR protection support for STmicro/Micron chips and similar */
+ 	if (JEDEC_MFR(info) == SNOR_MFR_MICRON ||
+-			info->flags & SPI_NOR_HAS_LOCK) {
++	    JEDEC_MFR(info) == SNOR_MFR_WINBOND ||
++	    info->flags & SPI_NOR_HAS_LOCK) {
+ 		nor->flash_lock = stm_lock;
+ 		nor->flash_unlock = stm_unlock;
+ 		nor->flash_is_locked = stm_is_locked;

target/linux/generic/pending-4.9/466-Revert-mtd-spi-nor-fix-Spansion-regressions-aliased-.patch

@@ -0,0 +1,37 @@
+From: Matthias Schiffer <[email protected]>
+Date: Tue, 9 Jan 2018 20:41:48 +0100
+Subject: [PATCH] Revert "mtd: spi-nor: fix Spansion regressions (aliased with
+ Winbond)"
+
+This reverts commit 67b9bcd36906e12a15ffec19463afbbd6a41660e.
+
+The underlying issue breaking Spansion flash has been fixed with "mtd: spi-nor:
+wait until lock/unlock operations are ready" and "mtd: spi-nor: wait for SR_WIP
+to clear on initial unlock", so we can support unlocking for Winbond flash
+again.
+
+Signed-off-by: Matthias Schiffer <[email protected]>
+---
+ drivers/mtd/spi-nor/spi-nor.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+--- a/drivers/mtd/spi-nor/spi-nor.c
++++ b/drivers/mtd/spi-nor/spi-nor.c
+@@ -1597,6 +1597,7 @@ int spi_nor_scan(struct spi_nor *nor, co
+ 	    JEDEC_MFR(info) == SNOR_MFR_INTEL ||
+ 	    JEDEC_MFR(info) == SNOR_MFR_MACRONIX ||
+ 	    JEDEC_MFR(info) == SNOR_MFR_SST ||
++	    JEDEC_MFR(info) == SNOR_MFR_WINBOND ||
+ 	    info->flags & SPI_NOR_HAS_LOCK) {
+ 		write_enable(nor);
+ 		write_sr(nor, 0);
+@@ -1615,7 +1616,8 @@ int spi_nor_scan(struct spi_nor *nor, co
+ 
+ 	/* NOR protection support for STmicro/Micron chips and similar */
+ 	if (JEDEC_MFR(info) == SNOR_MFR_MICRON ||
+-			info->flags & SPI_NOR_HAS_LOCK) {
++	    JEDEC_MFR(info) == SNOR_MFR_WINBOND ||
++	    info->flags & SPI_NOR_HAS_LOCK) {
+ 		nor->flash_lock = stm_lock;
+ 		nor->flash_unlock = stm_unlock;
+ 		nor->flash_is_locked = stm_is_locked;