commit 98bd2ad47d47c0b0c919b42cea8ccdc13e1a9ab7
author Leonid Lobachev <leonidl@google.com> Wed Mar 27 14:02:57 2019 -0700
committer June Tate-Gans <jtgans@google.com> Thu Mar 28 16:25:19 2019 -0700
tree a63261cd218f093f7256d553f689aacb0242788a
parent 5a84e45d4743c90ac940cd00a3e20566794257ab

MLK-19433-3 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>
(cherry picked from commit da95f60611e8859eba3e7ccb715fdce4d6376774)

Change-Id: Idd0a2d96ecff30f091f417a17628ef611b2a38a1

drivers/misc/mxc_ocotp.c

diff --git a/drivers/misc/mxc_ocotp.c b/drivers/misc/mxc_ocotp.c
index 42f2d39..fe9f169 100644
--- a/drivers/misc/mxc_ocotp.c
+++ b/drivers/misc/mxc_ocotp.c
@@ -323,6 +323,11 @@
 	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;