From: Martin Fuzzey <martin.fuzzey@flowbird.group>
Date: Fri, 23 Nov 2018 09:53:06 +0000 (+0100)
Subject: w1: fix occasional enumeration failure
X-Git-Url: http://git.dujemihanovic.xyz/%22/img/sics.gif/%22/static/git-favicon.png?a=commitdiff_plain;h=b95938117cb2bd9b020305a58bd748a48e58d30a;p=u-boot.git

w1: fix occasional enumeration failure

Sometimes enumeration fails (about 1 in 50 times on my custom board).

The underlying reason is probably electrical but Linux does not have
the problem.

Comparing the Linux / u-boot implementations shows that Linux
retries the error case whereas u-boot aborts early.

Removing the early abort in u-boot fixes the problem.

Signed-off-by: Martin Fuzzey <martin.fuzzey@flowbird.group>
---

diff --git a/drivers/w1/w1-uclass.c b/drivers/w1/w1-uclass.c
index cb41b68eff..042b3b5ce0 100644
--- a/drivers/w1/w1-uclass.c
+++ b/drivers/w1/w1-uclass.c
@@ -84,10 +84,6 @@ static int w1_enumerate(struct udevice *bus)
 			rn |= (tmp64 << i);
 		}
 
-		/* last device or error, aborting here */
-		if ((triplet_ret & 0x03) == 0x03)
-			last_device = true;
-
 		if ((triplet_ret & 0x03) != 0x03) {
 			if (desc_bit == last_zero || last_zero < 0) {
 				last_device = 1;