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
