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Thu, 3 Sep 2026 13:35:30 +0000 From: Changhuang Liang To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Iwona Winiarska , Guenter Roeck Cc: openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-hwmon@vger.kernel.org, Philipp Zabel , Changhuang Liang Subject: [PATCH v1 5/6] hwmon: (peci/cputemp) Add support for Granite Rapids (GNR) Date: Thu, 3 Sep 2026 06:34:07 -0700 Message-Id: <20260903133408.110847-6-changhuang.liang@starfivetech.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260903133408.110847-1-changhuang.liang@starfivetech.com> References: <20260903133408.110847-1-changhuang.liang@starfivetech.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SHXPR01CA0020.CHNPR01.prod.partner.outlook.cn (2406:e500:c311:1b::29) To ZQ4PR01MB1202.CHNPR01.prod.partner.outlook.cn (2406:e500:c550:17::6) Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: ZQ4PR01MB1202:EE_|ZQ4PR01MB1201:EE_ X-MS-Office365-Filtering-Correlation-Id: 1608e3c6-1b19-4c78-e88f-08df09c03921 X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|23010399003|366016|52116014|376014|22082099003|38350700014|6133799003|10067099003|56012099006|18002099003; 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The GNR platform does not support the core mask scan via PCI local read, so handle this case explicitly by returning -EPERM and skipping the core mask initialization. Define new cpu_info structure for GNR with minimum PECI revision 0x40 and the thermal margin conversion function dts_ten_dot_six_to_millidegree(). Signed-off-by: Changhuang Liang --- drivers/hwmon/peci/cputemp.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/hwmon/peci/cputemp.c b/drivers/hwmon/peci/cputemp.c index 457089c561b4..43e52a6db79b 100644 --- a/drivers/hwmon/peci/cputemp.c +++ b/drivers/hwmon/peci/cputemp.c @@ -339,6 +339,17 @@ static int init_core_mask(struct peci_cputemp *priv) u32 data; int ret; + /* + * Some platforms (e.g. Granite Rapids) do not expose the RESOLVED_CORES + * register over PECI - per-core temperatures are simply not available. + */ + if (!reg) { + dev_dbg(priv->dev, + "resolved cores scan is not supported on vendor-family-model 0x%x\n", + peci_dev->info.x86_vfm); + return -EOPNOTSUPP; + } + /* Get the RESOLVED_CORES register value */ switch (peci_dev->info.x86_vfm) { case INTEL_ICELAKE_X: @@ -543,6 +554,11 @@ static const struct cpu_info cpu_emr = { .thermal_margin_to_millidegree = &dts_ten_dot_six_to_millidegree, }; +static const struct cpu_info cpu_gnr = { + .min_peci_revision = 0x40, + .thermal_margin_to_millidegree = &dts_ten_dot_six_to_millidegree, +}; + static const struct auxiliary_device_id peci_cputemp_ids[] = { { .name = "peci_cpu.cputemp.hsx", @@ -576,6 +592,10 @@ static const struct auxiliary_device_id peci_cputemp_ids[] = { .name = "peci_cpu.cputemp.emr", .driver_data = (kernel_ulong_t)&cpu_emr, }, + { + .name = "peci_cpu.cputemp.gnr", + .driver_data = (kernel_ulong_t)&cpu_gnr, + }, { } }; MODULE_DEVICE_TABLE(auxiliary, peci_cputemp_ids); -- 2.25.1