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

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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Fixes: e04d1ce9bbb49 ("hwmon: (ltc2978) Add polling for chips requiring it")
Signed-off-by: Guenter Roeck <[e-mail]>

drivers/hwmon/pmbus/ltc2978.c

···
 
 #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