From: Mike Jones michael-a1.jones@analog.com
commit cf2b012c90e74e85d8aea7d67e48868069cfee0c upstream.
Change 21537dc driver PMBus polling of MFR_COMMON from bits 5/4 to bits 6/5. This fixs a LTC297X family bug where polling always returns not busy even when the part is busy. This fixes a LTC388X and LTM467X bug where polling used PEND and NOT_IN_TRANS, and BUSY was not polled, which can lead to NACKing of commands. LTC388X and LTM467X modules now poll BUSY and PEND, increasing reliability by eliminating NACKing of commands.
Signed-off-by: Mike Jones michael-a1.jones@analog.com Link: https://lore.kernel.org/r/1580234400-2829-2-git-send-email-michael-a1.jones@... Fixes: e04d1ce9bbb49 ("hwmon: (ltc2978) Add polling for chips requiring it") Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/hwmon/pmbus/ltc2978.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/hwmon/pmbus/ltc2978.c +++ b/drivers/hwmon/pmbus/ltc2978.c @@ -82,8 +82,8 @@ enum chips { ltc2974, ltc2975, ltc2977,
#define LTC_POLL_TIMEOUT 100 /* in milli-seconds */
-#define LTC_NOT_BUSY BIT(5) -#define LTC_NOT_PENDING BIT(4) +#define LTC_NOT_BUSY BIT(6) +#define LTC_NOT_PENDING BIT(5)
/* * LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which