From ad5dd7ae4b0474b8e359c691cddb310940276695 Mon Sep 17 00:00:00 2001
From: Hector Palacios <hector.palacios@digi.com>
Date: Fri, 21 Nov 2014 17:54:43 +0100
Subject: [PATCH] mxs_ocotp: check for errors from the OTP controller after
writing
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>
Reviewed-by: Fabio Estevam <fabio.estevam@freescale.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 09002814f2f..1659ee6a5ee 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))
--
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