1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 5be09c048c5f..25763d2223b6 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -80,6 +80,13 @@ superio_inb(int reg)
         return inb(VAL);
 }
 
+static inline void
+superio_outb(int reg, int val)
+{
+        outb(reg, REG);
+        outb(val, VAL);
+}
+
 static int superio_inw(int reg)
 {
         int val;
@@ -1517,6 +1524,21 @@ static int __init it87_find(unsigned short *address,
                         sio_data->vid_value = superio_inb(IT87_SIO_VID_REG);
 
                 reg = superio_inb(IT87_SIO_PINX2_REG);
+                /*
+                 * The IT8720F has no VIN7 pin, so VCCH should always be
+                 * routed internally to VIN7 with an internal divider.
+                 * Curiously, there still is a configuration bit to control
+                 * this, which means it can be set incorrectly. And even
+                 * more curiously, many boards out there are improperly
+                 * configured, even though the IT8720F datasheet claims
+                 * that the internal routing of VCCH to VIN7 is the default
+                 * setting. So we force the internal routing in this case.
+                 */
+                if (sio_data->type == it8720 && !(reg & (1 << 1))) {
+                        reg |= (1 << 1);
+                        superio_outb(IT87_SIO_PINX2_REG, reg);
+                        pr_notice("it87: Routing internal VCCH to in7\n");
+                }
                 if (reg & (1 << 0))
                         pr_info("it87: in3 is VCC (+5V)\n");
                 if (reg & (1 << 1))