linux-kernel - [PATCH v2 4/6] mtd: spi-nor: get rid of SPI_NOR_NO

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Message-Id: <20240419141249.609534-5-mwalle@kernel.org>
Date: Fri, 19 Apr 2024 16:12:47 +0200
From: Michael Walle <mwalle@...nel.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>,
	Pratyush Yadav <pratyush@...nel.org>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>
Cc: Ricardo Ribalda <ribalda@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org,
	Michael Walle <mwalle@...nel.org>
Subject: [PATCH v2 4/6] mtd: spi-nor: get rid of SPI_NOR_NO_FR

The evervision FRAM devices are the only user of the NO_FR flag. Drop
the global flag and instead use a manufacturer fixup for the evervision
flashes to drop the fast read support.

Signed-off-by: Michael Walle <mwalle@...nel.org>
---
Please note, that the fast read opcode will still be set in
spi_nor_init_default_params(), but the selection of the read opcodes
just depends on the mask.

That is also something I want to fix soon: the opcodes can always
be set and the drivers/SFDP will only set the mask. Opcodes then can be
switched between 3b and 4b ones if necessary.
---
 drivers/mtd/spi-nor/core.c     |  9 ++-------
 drivers/mtd/spi-nor/core.h     |  2 --
 drivers/mtd/spi-nor/everspin.c | 19 +++++++++++++++----
 3 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index f4c0b5185818..4e2ae6642d4c 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -2923,15 +2923,10 @@ static void spi_nor_init_default_params(struct spi_nor *nor)
 	params->page_size = info->page_size ?: SPI_NOR_DEFAULT_PAGE_SIZE;
 	params->n_banks = info->n_banks ?: SPI_NOR_DEFAULT_N_BANKS;
 
-	if (!(info->flags & SPI_NOR_NO_FR)) {
-		/* Default to Fast Read for DT and non-DT platform devices. */
+	/* Default to Fast Read for non-DT and enable it if requested by DT. */
+	if (!np || of_property_read_bool(np, "m25p,fast-read"))
 		params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
 
-		/* Mask out Fast Read if not requested at DT instantiation. */
-		if (np && !of_property_read_bool(np, "m25p,fast-read"))
-			params->hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
-	}
-
 	/* (Fast) Read settings. */
 	params->hwcaps.mask |= SNOR_HWCAPS_READ;
 	spi_nor_set_read_settings(&params->reads[SNOR_CMD_READ],
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 497957b64906..1516b6d0dc37 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -470,7 +470,6 @@ struct spi_nor_id {
  *                            Usually these will power-up in a write-protected
  *                            state.
  *   SPI_NOR_NO_ERASE:        no erase command needed.
- *   SPI_NOR_NO_FR:           can't do fastread.
  *   SPI_NOR_QUAD_PP:         flash supports Quad Input Page Program.
  *   SPI_NOR_RWW:             flash supports reads while write.
  *
@@ -519,7 +518,6 @@ struct flash_info {
 #define SPI_NOR_BP3_SR_BIT6		BIT(4)
 #define SPI_NOR_SWP_IS_VOLATILE		BIT(5)
 #define SPI_NOR_NO_ERASE		BIT(6)
-#define SPI_NOR_NO_FR			BIT(7)
 #define SPI_NOR_QUAD_PP			BIT(8)
 #define SPI_NOR_RWW			BIT(9)
 
diff --git a/drivers/mtd/spi-nor/everspin.c b/drivers/mtd/spi-nor/everspin.c
index 5f321e24ae7d..0720a61947e7 100644
--- a/drivers/mtd/spi-nor/everspin.c
+++ b/drivers/mtd/spi-nor/everspin.c
@@ -14,28 +14,39 @@ static const struct flash_info everspin_nor_parts[] = {
 		.size = SZ_16K,
 		.sector_size = SZ_16K,
 		.addr_nbytes = 2,
-		.flags = SPI_NOR_NO_ERASE | SPI_NOR_NO_FR,
+		.flags = SPI_NOR_NO_ERASE,
 	}, {
 		.name = "mr25h256",
 		.size = SZ_32K,
 		.sector_size = SZ_32K,
 		.addr_nbytes = 2,
-		.flags = SPI_NOR_NO_ERASE | SPI_NOR_NO_FR,
+		.flags = SPI_NOR_NO_ERASE,
 	}, {
 		.name = "mr25h10",
 		.size = SZ_128K,
 		.sector_size = SZ_128K,
-		.flags = SPI_NOR_NO_ERASE | SPI_NOR_NO_FR,
+		.flags = SPI_NOR_NO_ERASE,
 	}, {
 		.name = "mr25h40",
 		.size = SZ_512K,
 		.sector_size = SZ_512K,
-		.flags = SPI_NOR_NO_ERASE | SPI_NOR_NO_FR,
+		.flags = SPI_NOR_NO_ERASE,
 	}
 };
 
+static void evervision_nor_default_init(struct spi_nor *nor)
+{
+	/* Everspin FRAMs don't support the fast read opcode. */
+	nor->params->hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
+}
+
+static const struct spi_nor_fixups evervision_nor_fixups = {
+	.default_init = evervision_nor_default_init,
+};
+
 const struct spi_nor_manufacturer spi_nor_everspin = {
 	.name = "everspin",
 	.parts = everspin_nor_parts,
 	.nparts = ARRAY_SIZE(everspin_nor_parts),
+	.fixups = &evervision_nor_fixups,
 };
-- 
2.39.2