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For single-page devices, select page 0 explicitly. Fixes: cb3d37b59012 ("hwmon: (pmbus/tps53679) Add support for TI TPS53676") Cc: stable@vger.kernel.org Signed-off-by: Sanman Pradhan --- drivers/hwmon/pmbus/tps53679.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/hwmon/pmbus/tps53679.c b/drivers/hwmon/pmbus/tps53679.c index dcd4250b679d..4f91b0a43ad0 100644 --- a/drivers/hwmon/pmbus/tps53679.c +++ b/drivers/hwmon/pmbus/tps53679.c @@ -246,6 +246,15 @@ static int tps53676_identify(struct i2c_client *client, if (phases_b > 0) { info->pages =3D 2; info->phases[1] =3D phases_b; + } else { + /* + * pmbus_set_page() does not update the PAGE register on + * single-page devices, so select page 0 explicitly in case + * the boot firmware left the device on another page. + */ + ret =3D i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); + if (ret < 0) + return ret; } =20 return 0; --=20 2.34.1 From nobody Fri Sep 25 04:09:08 2026 Received: from mx0a-002e3701.pphosted.com (mx0a-002e3701.pphosted.com [148.163.147.86]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E88634D599E; 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Select page 0 explicitly before configuring PHASE. Signed-off-by: Sanman Pradhan --- drivers/hwmon/pmbus/tps53679.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/hwmon/pmbus/tps53679.c b/drivers/hwmon/pmbus/tps53679.c index 4f91b0a43ad0..df21bc5aa128 100644 --- a/drivers/hwmon/pmbus/tps53679.c +++ b/drivers/hwmon/pmbus/tps53679.c @@ -284,6 +284,17 @@ static int tps536c7_identify(struct i2c_client *client, */ info->pages =3D phases_b ? 2 : 1; =20 + /* + * pmbus_set_page() does not update the PAGE register on single-page + * devices, so select page 0 explicitly in case the boot firmware + * left the device on another page. + */ + if (info->pages =3D=3D 1) { + ret =3D i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); + if (ret < 0) + return ret; + } + /* * With info->phases[] left unset the PMBus core never programs the * PHASE selector, so make sure each page reports the aggregate --=20 2.34.1