From: Guenter Roeck <linux@roeck-us.net> stable inclusion from stable-v5.10.96 commit b48a05cee2c05e021036305b774ddf19dfb532b4 bugzilla: https://gitee.com/openeuler/kernel/issues/I55NWB Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit a66c5ed539277b9f2363bbace0dba88b85b36c26 ] 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@roeck-us.net> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Yu Liao <liaoyu15@huawei.com> Reviewed-by: Wei Li <liwei391@huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- drivers/hwmon/lm90.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c index 36c04feedc5d..ee9d49d4d8d0 100644 --- a/drivers/hwmon/lm90.c +++ b/drivers/hwmon/lm90.c @@ -373,7 +373,7 @@ static const struct lm90_params lm90_params[] = { .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 -- 2.20.1