hwmon: (nct6775) Fix fan6 detection for NCT6793D

Commit 2d99925a15b6 ("hwmon: (nct6775) Separate fan/pwm configuration
detection for NCT6793D") accidentally removed part of the code detecting
if fan6 is enabled or not. As result, fan6 is no longer detected on Asus
PRIME Z370-A. Restore the missing detection code.

Fixes: 2d99925a15b6 ("hwmon: (nct6775) Separate fan/pwm configuration detection for NCT6793D")
Reported-by: Chris Siebenmann <cks@cs.toronto.edu>
Cc: Chris Siebenmann <cks@cs.toronto.edu>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
index 4adec4ab7d06..59ee01f3d022 100644
--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -3594,7 +3594,8 @@ nct6775_check_fan_inputs(struct nct6775_data *data)
                         fan5pin |= cr1b & BIT(5);
                         fan5pin |= creb & BIT(5);
 
-                        fan6pin = creb & BIT(3);
+                        fan6pin = !dsw_en && (cr2d & BIT(1));
+                        fan6pin |= creb & BIT(3);
 
                         pwm5pin |= cr2d & BIT(7);
                         pwm5pin |= (creb & BIT(4)) && !(cr2a & BIT(0));