This is a note to let you know that I've just added the patch titled
hwmon: (lm90) Reduce maximum conversion rate for G781
to the 5.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hwmon-lm90-reduce-maximum-conversion-rate-for-g781.patch
and it can be found in the queue-5.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a66c5ed539277b9f2363bbace0dba88b85b36c26 Mon Sep 17 00:00:00 2001
From: Guenter Roeck <linux@xxxxxxxxxxxx>
Date: Thu, 6 Jan 2022 11:48:52 -0800
Subject: hwmon: (lm90) Reduce maximum conversion rate for G781
From: Guenter Roeck <linux@xxxxxxxxxxxx>
commit a66c5ed539277b9f2363bbace0dba88b85b36c26 upstream.
According to its datasheet, G781 supports a maximum conversion rate value
of 8 (62.5 ms). However, chips labeled G781 and G780 were found to only
support a maximum conversion rate value of 7 (125 ms). On the other side,
chips labeled G781-1 and G784 were found to support a conversion rate value
of 8. There is no known means to distinguish G780 from G781 or G784; all
chips report the same manufacturer ID and chip revision.
Setting the conversion rate register value to 8 on chips not supporting
it causes unexpected behavior since the real conversion rate is set to 0
(16 seconds) if a value of 8 is written into the conversion rate register.
Limit the conversion rate register value to 7 for all G78x chips to avoid
the problem.
Fixes: ae544f64cc7b ("hwmon: (lm90) Add support for GMT G781")
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hwmon/lm90.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -373,7 +373,7 @@ static const struct lm90_params lm90_par
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
| LM90_HAVE_BROKEN_ALERT | LM90_HAVE_CRIT,
.alert_alarms = 0x7c,
- .max_convrate = 8,
+ .max_convrate = 7,
},
[lm86] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
Patches currently in stable-queue which might be from linux@xxxxxxxxxxxx are
queue-5.16/usb-typec-tcpci-don-t-touch-cc-line-if-it-s-vconn-source.patch
queue-5.16/hwmon-lm90-mark-alert-as-broken-for-max6680.patch
queue-5.16/hwmon-lm90-reduce-maximum-conversion-rate-for-g781.patch
queue-5.16/hwmon-lm90-mark-alert-as-broken-for-max6646-6647-6649.patch
