[PATCH] mtd: spi-nor-tiny: fix 4-Byte address instructions for Cypress and ISSI

[Shiji Yang]

In theory, for the same vendor, we should use the same instructions as
the spi-nor-core implementation.

Fixes: 72151ad10f8d ("mtd: spi-nor-core: Add Cypress manufacturer ID in set_4byte")
Fixes: 5bf3f3dd11db ("mtd: spi-nor: Enable QE bit for ISSI flash")
Signed-off-by: Shiji Yang <yangshiji66 at outlook.com>
---
 drivers/mtd/spi/spi-nor-tiny.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mtd/spi/spi-nor-tiny.c b/drivers/mtd/spi/spi-nor-tiny.c
index 23de64a1520..cf00473ee83 100644
--- a/drivers/mtd/spi/spi-nor-tiny.c
+++ b/drivers/mtd/spi/spi-nor-tiny.c
@@ -220,6 +220,7 @@ static inline int set_4byte(struct spi_nor *nor, const struct flash_info *info,
 		/* Some Micron need WREN command; all will accept it */
 		need_wren = true;
 		fallthrough;
+	case SNOR_MFR_ISSI:
 	case SNOR_MFR_MACRONIX:
 	case SNOR_MFR_WINBOND:
 		if (need_wren)
@@ -246,6 +247,9 @@ static inline int set_4byte(struct spi_nor *nor, const struct flash_info *info,
 		}
 
 		return status;
+	case SNOR_MFR_CYPRESS:
+		cmd = enable ? SPINOR_OP_EN4B : SPINOR_OP_EX4B_CYPRESS;
+		return spi_nor_write_reg(nor, cmd, NULL, 0);
 	default:
 		/* Spansion style */
 		nor->cmd_buf[0] = enable << 7;
-- 
2.51.0