X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=drivers%2Fmtd%2Fspi%2Fsf_probe.c;h=4d148d1ace3749744cbc1e9ef190f5fdcb84649a;hb=2c19478e01ab145c8b3a1f5b1beca9958d942e98;hp=36ae5e0a7736f4b46c3570b42bd2c8aa26bb6822;hpb=dab5e3469d294a4e1ffed8407d296a78e02cc01f;p=u-boot

diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c
index 36ae5e0a77..4d148d1ace 100644
--- a/drivers/mtd/spi/sf_probe.c
+++ b/drivers/mtd/spi/sf_probe.c
@@ -281,6 +281,34 @@ int spi_flash_decode_fdt(const void *blob, struct spi_flash *flash)
 }
 #endif /* CONFIG_OF_CONTROL */
 
+#ifdef CONFIG_SYS_SPI_ST_ENABLE_WP_PIN
+/* enable the W#/Vpp signal to disable writing to the status register */
+static int spi_enable_wp_pin(struct spi_flash *flash)
+{
+	u8 status;
+	int ret;
+
+	ret = spi_flash_cmd_read_status(flash, &status);
+	if (ret < 0)
+		return ret;
+
+	ret = spi_flash_cmd_write_status(flash, STATUS_SRWD);
+	if (ret < 0)
+		return ret;
+
+	ret = spi_flash_cmd_write_disable(flash);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+#else
+static int spi_enable_wp_pin(struct spi_flash *flash)
+{
+	return 0;
+}
+#endif
+
 static struct spi_flash *spi_flash_probe_slave(struct spi_slave *spi)
 {
 	struct spi_flash *flash = NULL;
@@ -351,6 +379,8 @@ static struct spi_flash *spi_flash_probe_slave(struct spi_slave *spi)
 		puts(" Full access #define CONFIG_SPI_FLASH_BAR\n");
 	}
 #endif
+	if (spi_enable_wp_pin(flash))
+		puts("Enable WP pin failed\n");
 
 	/* Release spi bus */
 	spi_release_bus(spi);