From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pa0-x22b.google.com ([2607:f8b0:400e:c03::22b]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1a8uef-0003OA-Ld for linux-mtd@lists.infradead.org; Tue, 15 Dec 2015 18:48:58 +0000 Received: by mail-pa0-x22b.google.com with SMTP id tl7so764928pab.3 for ; Tue, 15 Dec 2015 10:48:37 -0800 (PST) From: Brian Norris To: Cc: , Brian Norris , Daniel Kurtz , Marek Vasut , Bayi Cheng , =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= , Felix Fietkau , =?UTF-8?q?Eddie=20Huang=20=28=E9=BB=83=E6=99=BA=E5=82=91=29?= , =?UTF-8?q?Milton=20Chiang=20=28=E6=B1=9F=E6=98=8E=E6=99=8F=29?= Subject: [PATCH for-4.4 1/2] mtd: spi-nor: fix Spansion regressions (aliased with Winbond) Date: Tue, 15 Dec 2015 10:48:20 -0800 Message-Id: <1450205301-32207-1-git-send-email-computersforpeace@gmail.com> List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Spansion and Winbond have occasionally used the same manufacturer ID, and they don't support the same features. Particularly, writing SR=0 seems to break read access for Spansion's s25fl064k. Unfortunately, we don't currently have a way to differentiate these Spansion and Winbond parts, so rather than regressing support for these Spansion flash, let's drop the new Winbond lock/unlock support for now. We can try to address Winbond support during the next release cycle. Original discussion: http://patchwork.ozlabs.org/patch/549173/ http://patchwork.ozlabs.org/patch/553683/ Fixes: 357ca38d4751 ("mtd: spi-nor: support lock/unlock/is_locked for Winbond") Fixes: c6fc2171b249 ("mtd: spi-nor: disable protection for Winbond flash at startup") Signed-off-by: Brian Norris Reported-by: Felix Fietkau Cc: Felix Fietkau --- drivers/mtd/spi-nor/spi-nor.c | 6 ++---- include/linux/mtd/spi-nor.h | 2 +- 2 files changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index 49883905a434..f5d59de1ee6e 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -1200,8 +1200,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode) if (JEDEC_MFR(info) == SNOR_MFR_ATMEL || JEDEC_MFR(info) == SNOR_MFR_INTEL || - JEDEC_MFR(info) == SNOR_MFR_SST || - JEDEC_MFR(info) == SNOR_MFR_WINBOND) { + JEDEC_MFR(info) == SNOR_MFR_SST) { write_enable(nor); write_sr(nor, 0); } @@ -1217,8 +1216,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode) mtd->_read = spi_nor_read; /* NOR protection support for STmicro/Micron chips and similar */ - if (JEDEC_MFR(info) == SNOR_MFR_MICRON || - JEDEC_MFR(info) == SNOR_MFR_WINBOND) { + if (JEDEC_MFR(info) == SNOR_MFR_MICRON) { nor->flash_lock = stm_lock; nor->flash_unlock = stm_unlock; nor->flash_is_locked = stm_is_locked; diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index c8723b62c4cd..bc742dac7d3a 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -25,7 +25,7 @@ #define SNOR_MFR_MACRONIX CFI_MFR_MACRONIX #define SNOR_MFR_SPANSION CFI_MFR_AMD #define SNOR_MFR_SST CFI_MFR_SST -#define SNOR_MFR_WINBOND 0xef +#define SNOR_MFR_WINBOND 0xef /* Also used by some Spansion */ /* * Note on opcode nomenclature: some opcodes have a format like -- 2.6.0.rc2.230.g3dd15c0