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hwmon: (pmbus/ltc2978) Fix PMBus polling of MFR_COMMON definitions.

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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 <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Fixes: e04d1ce9bb ("hwmon: (ltc2978) Add polling for chips requiring it")
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Mike Jones 2020-01-28 10:59:59 -07:00 • committed by Greg Kroah-Hartman
commit 671338889e
1 changed files with 2 additions and 2 deletions
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4
drivers/hwmon/pmbus/ltc2978.c
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@ -82,8 +82,8 @@ enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc2980, ltc3880, ltc3882,
#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