hwmon: (pmbus/pxe1610) don't bail out when not all pages are active

[ Upstream commit f025314306ae17a3fdaf2874d7e878ce19cea363 ]

Certain VRs might be configured to use only the first output channel and
so the mode for the second will be 0. Handle this gracefully.

Fixes: b9fa0a3acfd8 ("hwmon: (pmbus/core) Add support for vid mode detection per page bases")
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Link: https://lore.kernel.org/r/20210416102926.13614-1-fercerpav@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/hwmon/pmbus/pxe1610.c b/drivers/hwmon/pmbus/pxe1610.c
index da27ce34ee3fd05153e44b0908a3a32ee2be9235..eb4a06003b7f97cbd5088d319f424059839a398d 100644 (file)
--- a/drivers/hwmon/pmbus/pxe1610.c
+++ b/drivers/hwmon/pmbus/pxe1610.c
@@ -41,6 +41,15 @@ static int pxe1610_identify(struct i2c_client *client,
                                info->vrm_version[i] = vr13;
                                break;
                        default:
+                               /*
+                                * If prior pages are available limit operation
+                                * to them
+                                */
+                               if (i != 0) {
+                                       info->pages = i;
+                                       return 0;
+                               }
+
                                return -ENODEV;
                        }
                }