hwmon: (nct6775) Use different register to get fan RPM for fan7

The documented register to retrieve the fan RPM for fan7 is found
to be unreliable at least with NCT6796D revision 3. Let's use
register 0x4ce instead. This is undocumented for NCT6796D, but
documented for NCT6797D and NCT6798D and known to be working.

Reported-by: Robert Kern <ulteq@web.de>
Cc: Robert Kern <ulteq@web.de>
Fixes: 81820059a428 ("hwmon: (nct6775) Add support for NCT6796D")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
index af4d8792bbb5123a82051d85d0daae713f9cd742..78603b78cf410de903aa22d55147e6b600ab0398 100644 (file)
--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -502,7 +502,7 @@ static const s8 NCT6779_BEEP_BITS[] = {
        30, 31 };                       /* intrusion0, intrusion1 */
 
 static const u16 NCT6779_REG_FAN[] = {
-       0x4c0, 0x4c2, 0x4c4, 0x4c6, 0x4c8, 0x4ca, 0x660 };
+       0x4c0, 0x4c2, 0x4c4, 0x4c6, 0x4c8, 0x4ca, 0x4ce };
 static const u16 NCT6779_REG_FAN_PULSES[NUM_FAN] = {
        0x644, 0x645, 0x646, 0x647, 0x648, 0x649 };
 
@@ -1293,7 +1293,7 @@ static bool is_word_sized(struct nct6775_data *data, u16 reg)
                  reg == 0x402 ||
                  reg == 0x63a || reg == 0x63c || reg == 0x63e ||
                  reg == 0x640 || reg == 0x642 || reg == 0x64a ||
-                 reg == 0x64c || reg == 0x660 ||
+                 reg == 0x64c ||
                  reg == 0x73 || reg == 0x75 || reg == 0x77 || reg == 0x79 ||
                  reg == 0x7b || reg == 0x7d;
        }