From: Hector Palacios <hector.palacios@digi.com>
Date: Fri, 21 Nov 2014 16:54:43 +0000 (+0100)
Subject: mxs_ocotp: check for errors from the OTP controller after writing
X-Git-Tag: v2015.01-rc4~30^2~11
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ad5dd7ae4b0474b8e359c691cddb310940276695;p=platform%2Fkernel%2Fu-boot.git

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>
---

diff --git a/drivers/misc/mxs_ocotp.c b/drivers/misc/mxs_ocotp.c
index 0900281..1659ee6 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))