[U-Boot] [PATCH 2/3] mxs_ocotp: check for errors from the OTP controller after writing

Hector Palacios
2014-11-21T16:54:43Z

The write operation may fail when trying to write to a locked area. In
this case the ERROR bit is set in the CTRL register. Check for that
condition and return an error.

Signed-off-by: Hector Palacios <hector.palacios@digi.com>
---
drivers/misc/mxs_ocotp.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/misc/mxs_ocotp.c b/drivers/misc/mxs_ocotp.c
index 09002814f2f0..1659ee6a5eec 100644
--- a/drivers/misc/mxs_ocotp.c
+++ b/drivers/misc/mxs_ocotp.c
@@ -221,6 +221,13 @@ static int mxs_ocotp_write_fuse(uint32_t addr, uint32_t mask)
goto fail;
}

+ /* Check for errors */
+ if (readl(&ocotp_regs->hw_ocotp_ctrl) & OCOTP_CTRL_ERROR) {
+ puts("Failed writing fuses!\n");
+ ret = -EPERM;
+ goto fail;
+ }
+
fail:
mxs_ocotp_scale_vddio(0, &vddio_val);
if (mxs_ocotp_scale_hclk(0, &hclk_val))