linux-kernel - [PATCH] hwmon: pmbus: pxe1610: don't bail out when not all pages are active

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Message-Id: <20210415133535.11171-1-fercerpav@gmail.com>
Date:   Thu, 15 Apr 2021 16:34:56 +0300
From:   Paul Fertser <fercerpav@...il.com>
To:     linux-hwmon@...r.kernel.org
Cc:     Paul Fertser <fercerpav@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>,
        Vadim Pasternak <vadimp@...lanox.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] hwmon: pmbus: pxe1610: don't bail out when not all pages are active

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@...il.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