commit 4d5e0a2e45ca7a52710cd9f650cc128f60f5a1ea
author Ye Li <ye.li@nxp.com> Wed Apr 17 09:41:23 2019 +0000
committer Stefano Babic <sbabic@denx.de> Thu Apr 25 19:16:24 2019 +0200
tree 0d92e4789d72763d559fbb0223989f721ae76de5
parent 2cb89e3e03322acd233b0b767a3e164aa2e1827a

mxc_ocotp: Disable fuse sense for imx8mq B1

On iMX8MQ Rev B1, reading from fuse box is not allowed. The
OCOTP_READ_FUSE_DATA register is tied to magic number 0xff0055aa
for chip rev. So u-boot has to disable the fuse sense function for it.

Signed-off-by: Ye Li <ye.li@nxp.com>
Tested-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>

drivers/misc/mxc_ocotp.c

diff --git a/drivers/misc/mxc_ocotp.c b/drivers/misc/mxc_ocotp.c
index 33ea311..1b945e9 100644
--- a/drivers/misc/mxc_ocotp.c
+++ b/drivers/misc/mxc_ocotp.c
@@ -321,6 +321,11 @@
 	struct ocotp_regs *regs;
 	int ret;
 
+	if (is_imx8mq() && is_soc_rev(CHIP_REV_2_1)) {
+		printf("mxc_ocotp %s(): fuse sense is disabled\n", __func__);
+		return -EPERM;
+	}
+
 	ret = prepare_read(&regs, bank, word, val, __func__);
 	if (ret)
 		return ret;