[PATCH v10 2/2] mtd: spi-nor: Set default Quad Enable method for ISSI flashes

[<Tudor.Ambarus@microchip.com>]

From: Sagar Shrikant Kadam <sagar.kadam@sifive.com>

Set the default Quad Enable method for ISSI flashes. Used for
ISSI flashes (IS25WP256D-JMLE) that do not support SFDP tables
and can not determine the Quad Enable method by parsing BFPT.

Based on code originally written by Wesley Terpstra <wesley@sifive.com>
and/or Palmer Dabbelt <palmer@sifive.com>
https://github.com/riscv/riscv-linux/commit/c94e267766d62bc9a669611c3d0c8ed5ea26569b

Signed-off-by: Sagar Shrikant Kadam <sagar.kadam@sifive.com>
[tudor.ambarus@microchip.com:
- rebase, split and adapt for v5.4-rc4,
- use PMC CFI ID for ISSI. According to JEP106BA, "Programmable Micro Corp"
  changed its name to Integrated Silicon Solution (ISSI)]
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
---
Sagar, this is needed just for the ISSI flashes that can't retrieve the
Quad Enable method from BFPT. It deserves a separate patch. Let me know
if you are ok with how I reorganized the patches.

 drivers/mtd/spi-nor/spi-nor.c | 9 +++++++++
 include/linux/mtd/spi-nor.h   | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 3fc1eb20dca5..122e5bedf4f2 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -4385,6 +4385,11 @@ static int spi_nor_setup(struct spi_nor *nor,
 	return nor->params.setup(nor, hwcaps);
 }
 
+static void issi_set_default_init(struct spi_nor *nor)
+{
+	nor->params.quad_enable = macronix_quad_enable;
+}
+
 static void macronix_set_default_init(struct spi_nor *nor)
 {
 	nor->params.quad_enable = macronix_quad_enable;
@@ -4412,6 +4417,10 @@ static void spi_nor_manufacturer_init_params(struct spi_nor *nor)
 {
 	/* Init flash parameters based on MFR */
 	switch (JEDEC_MFR(nor->info)) {
+	case SNOR_MFR_ISSI:
+		issi_set_default_init(nor);
+		break;
+
 	case SNOR_MFR_MACRONIX:
 		macronix_set_default_init(nor);
 		break;
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index fc0b4b19c900..b4636ff707ad 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -22,6 +22,7 @@
 #define SNOR_MFR_INTEL		CFI_MFR_INTEL
 #define SNOR_MFR_ST		CFI_MFR_ST	/* ST Micro */
 #define SNOR_MFR_MICRON		CFI_MFR_MICRON	/* Micron */
+#define SNOR_MFR_ISSI		CFI_MFR_PMC
 #define SNOR_MFR_MACRONIX	CFI_MFR_MACRONIX
 #define SNOR_MFR_SPANSION	CFI_MFR_AMD
 #define SNOR_MFR_SST		CFI_MFR_SST
-- 
2.9.5


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