linux-kernel - [PATCH] docs: driver-api/thermal/intel

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Message-ID: <20251118223620.554798-1-srinivas.pandruvada@linux.intel.com>
Date: Tue, 18 Nov 2025 14:36:19 -0800
From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To: rafael@...nel.org,
	daniel.lezcano@...aro.org
Cc: corbet@....net,
	linux-pm@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	rdunlap@...radead.org,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [PATCH] docs: driver-api/thermal/intel_dptf: Add new workload type hint

Add documentation for longer term classification of workload type for
power or performance.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
 .../driver-api/thermal/intel_dptf.rst         | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/Documentation/driver-api/thermal/intel_dptf.rst b/Documentation/driver-api/thermal/intel_dptf.rst
index c51ac793dc06..916bf0f36a03 100644
--- a/Documentation/driver-api/thermal/intel_dptf.rst
+++ b/Documentation/driver-api/thermal/intel_dptf.rst
@@ -409,3 +409,26 @@ based on the processor generation.
 		Limit 1 from being exhausted.
 
 	4 – Unknown: Can't classify.
+
+	On processors starting from Panther Lake additional hints are provided.
+	The hardware analyzes workload residencies over an extended period to
+	determine whether the workload classification tends toward idle/battery
+	life states or sustained/performance states. Based on this long-term
+	analysis, it classifies:
+
+	Power Classification: If the workload exhibits more idle or battery life
+	residencies, it is classified as "power".
+
+	Performance Classification: If the workload exhibits more sustained or
+	performance residencies, it is classified as "performance".
+
+	This approach enables applications to ignore short-term workload
+	fluctuations and instead respond to longer-term power vs. performance
+	trends.
+
+	Residency thresholds for this classification are CPU generation-specific.
+	Classification is reported via bit 4 of the workload_type_index:
+
+	Bit 4 = 1: Power classification
+
+	Bit 4 = 0: Performance classification
-- 
2.51.0