linux-kernel - [PATCH 2/3] mtd: spi_nor: Introduce spi_nor_set_addr

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Date:   Wed, 31 Jul 2019 09:18:47 +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>,
        <Tudor.Ambarus@...rochip.com>
Subject: [PATCH 2/3] mtd: spi_nor: Introduce spi_nor_set_addr_width()

From: Tudor Ambarus <tudor.ambarus@...rochip.com>

Parsing of flash parameters were interleaved with setting of the
nor addr width. Dedicate a function for setting nor addr width.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 50 ++++++++++++++++++++++++++-----------------
 1 file changed, 30 insertions(+), 20 deletions(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index fba941a932cc..c322d7cd8216 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -4773,6 +4773,33 @@ static const struct flash_info *spi_nor_match_id(const char *name)
 	return NULL;
 }
 
+static int spi_nor_set_addr_width(struct spi_nor *nor)
+{
+	if (nor->addr_width) {
+		/* already configured from SFDP */
+	} else if (nor->info->addr_width) {
+		nor->addr_width = nor->info->addr_width;
+	} else if (nor->mtd.size > 0x1000000) {
+		/* enable 4-byte addressing if the device exceeds 16MiB */
+		nor->addr_width = 4;
+	} else {
+		nor->addr_width = 3;
+	}
+
+	if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
+		dev_err(nor->dev, "address width is too large: %u\n",
+			nor->addr_width);
+		return -EINVAL;
+	}
+
+	/* Set 4byte opcodes when possible. */
+	if (nor->addr_width == 4 && nor->flags & SNOR_F_4B_OPCODES &&
+	    !(nor->flags & SNOR_F_HAS_4BAIT))
+		spi_nor_set_4byte_opcodes(nor);
+
+	return 0;
+}
+
 int spi_nor_scan(struct spi_nor *nor, const char *name,
 		 const struct spi_nor_hwcaps *hwcaps)
 {
@@ -4903,29 +4930,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	if (ret)
 		return ret;
 
-	if (nor->addr_width) {
-		/* already configured from SFDP */
-	} else if (info->addr_width) {
-		nor->addr_width = info->addr_width;
-	} else if (mtd->size > 0x1000000) {
-		/* enable 4-byte addressing if the device exceeds 16MiB */
-		nor->addr_width = 4;
-	} else {
-		nor->addr_width = 3;
-	}
-
 	if (info->flags & SPI_NOR_4B_OPCODES)
 		nor->flags |= SNOR_F_4B_OPCODES;
 
-	if (nor->addr_width == 4 && nor->flags & SNOR_F_4B_OPCODES &&
-	    !(nor->flags & SNOR_F_HAS_4BAIT))
-		spi_nor_set_4byte_opcodes(nor);
-
-	if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
-		dev_err(dev, "address width is too large: %u\n",
-			nor->addr_width);
-		return -EINVAL;
-	}
+	ret = spi_nor_set_addr_width(nor);
+	if (ret)
+		return ret;
 
 	/* Send all the required SPI flash commands to initialize device */
 	ret = spi_nor_init(nor);
-- 
2.9.5