This is a note to let you know that I've just added the patch titled hwmon: (pmbus/ltc2978) Fix PMBus polling of MFR_COMMON definitions. to the 4.9-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-pmbus-ltc2978-fix-pmbus-polling-of-mfr_common-definitions.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From cf2b012c90e74e85d8aea7d67e48868069cfee0c Mon Sep 17 00:00:00 2001 From: Mike Jones <michael-a1.jones@xxxxxxxxxx> Date: Tue, 28 Jan 2020 10:59:59 -0700 Subject: hwmon: (pmbus/ltc2978) Fix PMBus polling of MFR_COMMON definitions. From: Mike Jones <michael-a1.jones@xxxxxxxxxx> 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@xxxxxxxxxx> Link: https://lore.kernel.org/r/1580234400-2829-2-git-send-email-michael-a1.jones@xxxxxxxxxx Fixes: e04d1ce9bbb49 ("hwmon: (ltc2978) Add polling for chips requiring it") Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 @@ -89,8 +89,8 @@ 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 Patches currently in stable-queue which might be from michael-a1.jones@xxxxxxxxxx are queue-4.9/hwmon-pmbus-ltc2978-fix-pmbus-polling-of-mfr_common-definitions.patch