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-rw-r--r--drivers/nvmem/sprd-efuse.c24
1 files changed, 20 insertions, 4 deletions
diff --git a/drivers/nvmem/sprd-efuse.c b/drivers/nvmem/sprd-efuse.c
index 7a189ef52333..43b3f6ef8c20 100644
--- a/drivers/nvmem/sprd-efuse.c
+++ b/drivers/nvmem/sprd-efuse.c
@@ -217,12 +217,14 @@ static int sprd_efuse_raw_prog(struct sprd_efuse *efuse, u32 blk, bool doub,
* Enable the auto-check function to validate if the programming is
* successful.
*/
- sprd_efuse_set_auto_check(efuse, true);
+ if (lock)
+ sprd_efuse_set_auto_check(efuse, true);
writel(*data, efuse->base + SPRD_EFUSE_MEM(blk));
/* Disable auto-check and data double after programming */
- sprd_efuse_set_auto_check(efuse, false);
+ if (lock)
+ sprd_efuse_set_auto_check(efuse, false);
sprd_efuse_set_data_double(efuse, false);
/*
@@ -237,7 +239,7 @@ static int sprd_efuse_raw_prog(struct sprd_efuse *efuse, u32 blk, bool doub,
writel(SPRD_EFUSE_ERR_CLR_MASK,
efuse->base + SPRD_EFUSE_ERR_CLR);
ret = -EBUSY;
- } else {
+ } else if (lock) {
sprd_efuse_set_prog_lock(efuse, lock);
writel(0, efuse->base + SPRD_EFUSE_MEM(blk));
sprd_efuse_set_prog_lock(efuse, false);
@@ -322,6 +324,7 @@ unlock:
static int sprd_efuse_write(void *context, u32 offset, void *val, size_t bytes)
{
struct sprd_efuse *efuse = context;
+ bool lock;
int ret;
ret = sprd_efuse_lock(efuse);
@@ -332,7 +335,20 @@ static int sprd_efuse_write(void *context, u32 offset, void *val, size_t bytes)
if (ret)
goto unlock;
- ret = sprd_efuse_raw_prog(efuse, offset, false, false, val);
+ /*
+ * If the writing bytes are equal with the block width, which means the
+ * whole block will be programmed. For this case, we should not allow
+ * this block to be programmed again by locking this block.
+ *
+ * If the block was programmed partially, we should allow this block to
+ * be programmed again.
+ */
+ if (bytes < SPRD_EFUSE_BLOCK_WIDTH)
+ lock = false;
+ else
+ lock = true;
+
+ ret = sprd_efuse_raw_prog(efuse, offset, false, lock, val);
clk_disable_unprepare(efuse->clk);