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Subject[PATCH 1/6] mtd: spi-nor: Add post_sfdp() hook to tweak flash config
Date
From: Boris Brezillon <boris.brezillon@bootlin.com>

SFDP tables are sometimes wrong and we need a way to override the
config chosen by the SFDP parsing logic without discarding all of it.

Add a new hook called after the SFDP parsing has taken place to deal
with such problems.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
---
drivers/mtd/spi-nor/spi-nor.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 9b9f9b530207..2c2d13060427 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -221,6 +221,11 @@ struct sfdp_bfpt {
* flash parameters when information provided by the flash_info
* table is incomplete or wrong.
* @post_bfpt: called after the BFPT table has been parsed
+ * @post_sfdp: called after SFDP has been parsed (is also called for SPI NORs
+ * that do not support RDSFDP). Typically used to tweak various
+ * parameters that could not be extracted by other means (i.e.
+ * when information provided by the SFDP/flash_info tables are
+ * incomplete or wrong).
*
* Those hooks can be used to tweak the SPI NOR configuration when the SFDP
* table is broken or not available.
@@ -232,6 +237,8 @@ struct spi_nor_fixups {
const struct sfdp_parameter_header *bfpt_header,
const struct sfdp_bfpt *bfpt,
struct spi_nor_flash_parameter *params);
+ void (*post_sfdp)(struct spi_nor *nor,
+ struct spi_nor_flash_parameter *params);
};

struct flash_info {
@@ -4444,6 +4451,13 @@ static void spi_nor_default_init_params(struct spi_nor *nor,
spi_nor_init_uniform_erase_map(map, erase_mask, params->size);
}

+static void spi_nor_post_sfdp_fixups(struct spi_nor *nor,
+ struct spi_nor_flash_parameter *params)
+{
+ if (nor->info->fixups && nor->info->fixups->post_sfdp)
+ return nor->info->fixups->post_sfdp(nor, params);
+}
+
static void spi_nor_init_params(struct spi_nor *nor,
struct spi_nor_flash_parameter *params)
{
@@ -4454,6 +4468,8 @@ static void spi_nor_init_params(struct spi_nor *nor,
if ((nor->info->flags & (SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)) &&
!(nor->info->flags & SPI_NOR_SKIP_SFDP))
spi_nor_sfdp_init_params(nor, params);
+
+ spi_nor_post_sfdp_fixups(nor, params);
}

static int spi_nor_select_read(struct spi_nor *nor,
--
2.9.5
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