linux-kernel - [PATCH 1/6] mtd: spi-nor: Add post_sfdp() hook to tweak flash config

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Date:   Wed, 31 Jul 2019 09:12:08 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <boris.brezillon@...labora.com>, <marek.vasut@...il.com>,
        <vigneshr@...com>
CC:     <dwmw2@...radead.org>, <computersforpeace@...il.com>,
        <miquel.raynal@...tlin.com>, <richard@....at>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <boris.brezillon@...tlin.com>, <Tudor.Ambarus@...rochip.com>
Subject: [PATCH 1/6] mtd: spi-nor: Add post_sfdp() hook to tweak flash config

From: Boris Brezillon <boris.brezillon@...tlin.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@...tlin.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.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