[PATCH 2/4] misc: k3_fuse: Check readback on fuse prog

[Anshul Dalal]

From: Vignesh Raghavendra <vigneshr at ti.com>

Error out if readback value doesn't match the programmed value.

Signed-off-by: Vignesh Raghavendra <vigneshr at ti.com>
Signed-off-by: Anshul Dalal <anshuld at ti.com>
---
 drivers/misc/k3_fuse.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/k3_fuse.c b/drivers/misc/k3_fuse.c
index cefdedaf411..882fd431659 100644
--- a/drivers/misc/k3_fuse.c
+++ b/drivers/misc/k3_fuse.c
@@ -52,8 +52,15 @@ int fuse_prog(u32 bank, u32 word, u32 val)
 	arm_smccc_smc(K3_SIP_OTP_WRITE, word,
 		      val, mask, 0, 0, 0, 0, &res);
 
-	if (res.a0 != 0)
+	if (res.a0 != 0) {
 		printf("SMC call failed: Error code %ld\n", res.a0);
+		return res.a0;
+	}
+
+	if (res.a1 != val) {
+		printf("Readback failed, written 0x%x readback 0x%lx\n", val, res.a1);
+		return -EINVAL;
+	}
 
 	return res.a0;
 }

-- 
2.52.0