[PATCH v2] sf: Querying write-protect status before operating the flash

[chaochao2021666@163.com]

From: chao zeng <chao.zeng@siemens.com>

When operating the write-protection flash,spi_flash_std_write() and
spi_flash_std_erase() would return wrong result.The flash is protected,
but write or erase the flash would show "OK".

Check the flash write protection state before operating the flash
and give a prompt to show it has been locked if the write-protection
has enbale

Signed-off-by: chao zeng <chao.zeng@siemens.com>

---

Changes for V2:
     - Return 0 not ENOPROTOOPT to refelect the flash feature
     - Output prompt information
---
 drivers/mtd/spi/sf_probe.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c
index f461082e03..995801817d 100644
--- a/drivers/mtd/spi/sf_probe.c
+++ b/drivers/mtd/spi/sf_probe.c
@@ -109,6 +109,11 @@ static int spi_flash_std_write(struct udevice *dev, u32 offset, size_t len,
 	struct mtd_info *mtd = &flash->mtd;
 	size_t retlen;
 
+	if (flash->flash_is_locked && flash->flash_is_locked(flash, offset, len)) {
+		printf("SF: Flash is locked\n");
+		return 0;
+	}
+
 	return mtd->_write(mtd, offset, len, &retlen, buf);
 }
 
@@ -127,6 +132,11 @@ static int spi_flash_std_erase(struct udevice *dev, u32 offset, size_t len)
 	instr.addr = offset;
 	instr.len = len;
 
+	if (flash->flash_is_locked && flash->flash_is_locked(flash, offset, len)) {
+		printf("SF: Flash is locked\n");
+		return 0;
+	}
+
 	return mtd->_erase(mtd, &instr);
 }
 
-- 
2.33.1