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From:   Paul Fertser <fercerpav@gmail.com>
To:     linux-hwmon@vger.kernel.org
Cc:     Paul Fertser <fercerpav@gmail.com>,
        Guenter Roeck <linux@roeck-us.net>,
        Jean Delvare <jdelvare@suse.com>,
        Vadim Pasternak <vadimp@mellanox.com>,
        linux-kernel@vger.kernel.org
Subject: [PATCH] hwmon: pmbus: pxe1610: don't bail out when not all pages are active
Date:   Thu, 15 Apr 2021 16:34:56 +0300
Message-Id: <20210415133535.11171-1-fercerpav@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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>
---
 drivers/hwmon/pmbus/pxe1610.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/pmbus/pxe1610.c b/drivers/hwmon/pmbus/pxe1610.c
index 517584cff3de..ff6f6e05923b 100644
--- a/drivers/hwmon/pmbus/pxe1610.c
+++ b/drivers/hwmon/pmbus/pxe1610.c
@@ -41,7 +41,16 @@ static int pxe1610_identify(struct i2c_client *client,
 				info->vrm_version[i] = vr13;
 				break;
 			default:
-				return -ENODEV;
+				/*
+				 * If prior pages are available limit operation
+				 * to them
+				 */
+				if (i != 0) {
+					info->pages = i;
+					return 0;
+				} else {
+					return -ENODEV;
+				}
 			}
 		}
 	}
-- 
2.17.1