linux-kernel - [PATCH v2 06/41] mtd: spi-nor: default page

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Message-Id: <20230807-mtd-flash-info-db-rework-v2-6-291a0f39f8d8@kernel.org>
Date:   Tue, 22 Aug 2023 09:09:22 +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:     linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        Michael Walle <mwalle@...nel.org>
Subject: [PATCH v2 06/41] mtd: spi-nor: default page_size to 256 bytes

The INFO() macro always set the page_size to 256 bytes. Make that an
optional parameter. This default is a sane one for all older flashes,
newer ones will set the page size by its SFDP tables anyway.

Signed-off-by: Michael Walle <mwalle@...nel.org>
Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 drivers/mtd/spi-nor/core.c | 7 +------
 drivers/mtd/spi-nor/core.h | 8 ++++++--
 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index f4cc2eafcc5e..d27ad1295ee0 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -2018,11 +2018,6 @@ static const struct spi_nor_manufacturer *manufacturers[] = {
 static const struct flash_info spi_nor_generic_flash = {
 	.name = "spi-nor-generic",
 	.n_banks = 1,
-	/*
-	 * JESD216 rev A doesn't specify the page size, therefore we need a
-	 * sane default.
-	 */
-	.page_size = 256,
 	.parse_sfdp = true,
 };
 
@@ -3001,7 +2996,7 @@ static void spi_nor_init_default_params(struct spi_nor *nor)
 	params->writesize = 1;
 	params->size = info->size;
 	params->bank_size = params->size;
-	params->page_size = info->page_size;
+	params->page_size = info->page_size ?: SPI_NOR_DEFAULT_PAGE_SIZE;
 
 	if (!(info->flags & SPI_NOR_NO_FR)) {
 		/* Default to Fast Read for DT and non-DT platform devices. */
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 12c35409493b..25bc18197614 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -10,6 +10,11 @@
 #include "sfdp.h"
 
 #define SPI_NOR_MAX_ID_LEN	6
+/*
+ * 256 bytes is a sane default for most older flashes. Newer flashes will
+ * have the page size defined within their SFDP tables.
+ */
+#define SPI_NOR_DEFAULT_PAGE_SIZE 256
 
 /* Standard SPI NOR flash operations. */
 #define SPI_NOR_READID_OP(naddr, ndummy, buf, len)			\
@@ -447,7 +452,7 @@ struct spi_nor_fixups {
  * @sector_size:    the size listed here is what works with SPINOR_OP_SE, which
  *                  isn't necessarily called a "sector" by the vendor.
  * @n_banks:        the number of banks.
- * @page_size:      the flash's page size.
+ * @page_size:      (optional) the flash's page size. Defaults to 256.
  * @addr_nbytes:    number of address bytes to send.
  *
  * @parse_sfdp:     true when flash supports SFDP tables. The false value has no
@@ -558,7 +563,6 @@ struct flash_info {
 #define SPI_NOR_GEOMETRY(_sector_size, _n_sectors, _n_banks)		\
 	.size = (_sector_size) * (_n_sectors),				\
 	.sector_size = (_sector_size),					\
-	.page_size = 256,						\
 	.n_banks = (_n_banks)
 
 /* Used when the "_ext_id" is two bytes at most */

-- 
2.39.2