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From: Michael Walle <michael@walle.cc>
To: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: Vignesh Raghavendra <vigneshr@ti.com>,
	Tudor Ambarus <tudor.ambarus@microchip.com>,
	Richard Weinberger <richard@nod.at>,
	Michael Walle <michael@walle.cc>,
	Boris Brezillon <boris.brezillon@collabora.com>,
	Miquel Raynal <miquel.raynal@bootlin.com>
Subject: [PATCH v4 2/3] mtd: spi-nor: sst: remove global protection flag
Date: Sat,  3 Oct 2020 16:17:37 +0200
Message-ID: <20201003141738.8144-3-michael@walle.cc> (raw)
In-Reply-To: <20201003141738.8144-1-michael@walle.cc>

This is considered bad for the following reasons:
 (1) We only support the block protection with BPn bits for write
     protection. Not all SST parts support this.
 (2) Newly added flash chip will automatically inherit the "has
     locking" support and thus needs to explicitly tested. Better
     be opt-in instead of opt-out.
 (3) There are already supported flashes which doesn't support
     the locking scheme. So I assume this wasn't properly tested
     before adding that chip; which enforces my previous argument
     that locking support should be an opt-in.

Remove the global flag and add individual flags to all flashes
which supports BP locking. In particular the following flashes
don't support the BP scheme:
 - SST26VF016B
 - SST26WF016B
 - SST26VF064B

Signed-off-by: Michael Walle <michael@walle.cc>
---
changes since RFC:
 - none

 drivers/mtd/spi-nor/sst.c | 30 ++++++++++++------------------
 1 file changed, 12 insertions(+), 18 deletions(-)

diff --git a/drivers/mtd/spi-nor/sst.c b/drivers/mtd/spi-nor/sst.c
index e0af6d25d573..8b169fa4102a 100644
--- a/drivers/mtd/spi-nor/sst.c
+++ b/drivers/mtd/spi-nor/sst.c
@@ -11,26 +11,26 @@
 static const struct flash_info sst_parts[] = {
 	/* SST -- large erase sizes are "overlays", "sectors" are 4K */
 	{ "sst25vf040b", INFO(0xbf258d, 0, 64 * 1024,  8,
-			      SECT_4K | SST_WRITE) },
+			      SECT_4K | SST_WRITE | SPI_NOR_HAS_LOCK) },
 	{ "sst25vf080b", INFO(0xbf258e, 0, 64 * 1024, 16,
-			      SECT_4K | SST_WRITE) },
+			      SECT_4K | SST_WRITE | SPI_NOR_HAS_LOCK) },
 	{ "sst25vf016b", INFO(0xbf2541, 0, 64 * 1024, 32,
-			      SECT_4K | SST_WRITE) },
+			      SECT_4K | SST_WRITE | SPI_NOR_HAS_LOCK) },
 	{ "sst25vf032b", INFO(0xbf254a, 0, 64 * 1024, 64,
-			      SECT_4K | SST_WRITE) },
-	{ "sst25vf064c", INFO(0xbf254b, 0, 64 * 1024, 128, SECT_4K) },
+			      SECT_4K | SST_WRITE | SPI_NOR_HAS_LOCK) },
+	{ "sst25vf064c", INFO(0xbf254b, 0, 64 * 1024, 128, SECT_4K | SPI_NOR_HAS_LOCK) },
 	{ "sst25wf512",  INFO(0xbf2501, 0, 64 * 1024,  1,
-			      SECT_4K | SST_WRITE) },
+			      SECT_4K | SST_WRITE | SPI_NOR_HAS_LOCK) },
 	{ "sst25wf010",  INFO(0xbf2502, 0, 64 * 1024,  2,
-			      SECT_4K | SST_WRITE) },
+			      SECT_4K | SST_WRITE | SPI_NOR_HAS_LOCK) },
 	{ "sst25wf020",  INFO(0xbf2503, 0, 64 * 1024,  4,
-			      SECT_4K | SST_WRITE) },
-	{ "sst25wf020a", INFO(0x621612, 0, 64 * 1024,  4, SECT_4K) },
-	{ "sst25wf040b", INFO(0x621613, 0, 64 * 1024,  8, SECT_4K) },
+			      SECT_4K | SST_WRITE | SPI_NOR_HAS_LOCK) },
+	{ "sst25wf020a", INFO(0x621612, 0, 64 * 1024,  4, SECT_4K | SPI_NOR_HAS_LOCK) },
+	{ "sst25wf040b", INFO(0x621613, 0, 64 * 1024,  8, SECT_4K | SPI_NOR_HAS_LOCK) },
 	{ "sst25wf040",  INFO(0xbf2504, 0, 64 * 1024,  8,
-			      SECT_4K | SST_WRITE) },
+			      SECT_4K | SST_WRITE | SPI_NOR_HAS_LOCK) },
 	{ "sst25wf080",  INFO(0xbf2505, 0, 64 * 1024, 16,
-			      SECT_4K | SST_WRITE) },
+			      SECT_4K | SST_WRITE | SPI_NOR_HAS_LOCK) },
 	{ "sst26wf016b", INFO(0xbf2651, 0, 64 * 1024, 32,
 			      SECT_4K | SPI_NOR_DUAL_READ |
 			      SPI_NOR_QUAD_READ) },
@@ -127,11 +127,6 @@ static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
 	return ret;
 }
 
-static void sst_default_init(struct spi_nor *nor)
-{
-	nor->flags |= SNOR_F_HAS_LOCK;
-}
-
 static void sst_post_sfdp_fixups(struct spi_nor *nor)
 {
 	if (nor->info->flags & SST_WRITE)
@@ -139,7 +134,6 @@ static void sst_post_sfdp_fixups(struct spi_nor *nor)
 }
 
 static const struct spi_nor_fixups sst_fixups = {
-	.default_init = sst_default_init,
 	.post_sfdp = sst_post_sfdp_fixups,
 };
 
-- 
2.20.1


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Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-03 14:17 [PATCH v4 0/3] mtd: spi-nor: keep lock bits if they are non-volatile Michael Walle
2020-10-03 14:17 ` [PATCH v4 1/3] mtd: spi-nor: atmel: remove global protection flag Michael Walle
2020-10-03 14:17 ` Michael Walle [this message]
2020-10-03 14:17 ` [PATCH v4 3/3] mtd: spi-nor: keep lock bits if they are non-volatile Michael Walle

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