target/linux/mediatek/patches-5.4/9018-drivers-mtd-spi-nor-Add-calibration-support-for-spi-nor.patch

From b242e30661dac5c1c127999600029cd5b3f6b458 Mon Sep 17 00:00:00 2001
From: "SkyLake.Huang" <skylake.huang@mediatek.com>
Date: Thu, 23 Jun 2022 18:40:59 +0800
Subject: [PATCH] drivers: mtd: spi-nor: Add calibration support for spi-nor

Signed-off-by: SkyLake.Huang <skylake.huang@mediatek.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -4897,6 +4897,35 @@ static void spi_nor_debugfs_init(struct
 					 info->id_len, info->id);
 }
 
+static int spi_nor_cal_read(void *priv, u32 *addr, int addrlen, u8 *buf, int readlen)
+{
+	int ret;
+	struct spi_nor *nor = (struct spi_nor *)priv;
+
+	nor->reg_proto = SNOR_PROTO_1_1_1;
+	nor->read_proto = SNOR_PROTO_1_1_1;
+	nor->read_opcode = SPINOR_OP_READ;
+	nor->addr_width = 3;
+	nor->read_dummy = 0;
+
+	return spi_nor_read_raw(nor, *addr, readlen, buf);
+}
+
+static int spi_nor_cal_read_4B(void *priv, u32 *addr, int addrlen, u8 *buf,
+			    int readlen)
+{
+	int ret;
+	struct spi_nor *nor = (struct spi_nor *)priv;
+
+	nor->reg_proto = SNOR_PROTO_1_1_1;
+	nor->read_proto = SNOR_PROTO_1_1_1;
+	nor->read_opcode = SPINOR_OP_READ_4B;
+	nor->addr_width = 4;
+	nor->read_dummy = 0;
+
+	return spi_nor_read_raw(nor, *addr, readlen, buf);
+}
+
 static const struct flash_info *spi_nor_get_flash_info(struct spi_nor *nor,
 						       const char *name)
 {
@@ -4971,6 +5000,17 @@ int spi_nor_scan(struct spi_nor *nor, co
 	if (!nor->bouncebuf)
 		return -ENOMEM;
 
+	if(nor->spimem) {
+		ret = spi_mem_do_calibration(nor->spimem,
+					     spi_nor_cal_read, nor);
+		if (ret) {
+			ret = spi_mem_do_calibration(nor->spimem,
+						     spi_nor_cal_read_4B, nor);
+			if (ret)
+				return ret;
+		}
+	}
+
 	info = spi_nor_get_flash_info(nor, name);
 	if (IS_ERR(info))
 		return PTR_ERR(info);