[PATCH] w1: w1-gpio: Loosen timings to improve cold boot reliability

Chris Morgan macroalpha82 at gmail.com
Mon Nov 8 16:07:16 CET 2021


From: Chris Morgan <macromorgan at hotmail.com>

On my NTC CHIP whenever I do a cold boot any attached DIPs cannot be
found. Rebooting on the other hand appears to fix the issue. I found
that if I modified the timing slightly (but still within spec) the
w1 identification on cold boot became far more reliable.

Signed-off-by: Chris Morgan <macromorgan at hotmail.com>
---
 drivers/w1/w1-gpio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/w1/w1-gpio.c b/drivers/w1/w1-gpio.c
index 9346f810ce..5565de2a92 100644
--- a/drivers/w1/w1-gpio.c
+++ b/drivers/w1/w1-gpio.c
@@ -22,8 +22,8 @@
 #define W1_TIMING_E	9
 #define W1_TIMING_F	55
 #define W1_TIMING_G	0
-#define W1_TIMING_H	480
-#define W1_TIMING_I	70
+#define W1_TIMING_H	600
+#define W1_TIMING_I	100
 #define W1_TIMING_J	410
 
 struct w1_gpio_pdata {
-- 
2.30.2



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