linux-kernel - [PATCH v6 3/9] ACPI: CPPC: Rename EPP constants for clarity

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Message-ID: <20260120145623.2959636-4-sumitg@nvidia.com>
Date: Tue, 20 Jan 2026 20:26:17 +0530
From: Sumit Gupta <sumitg@...dia.com>
To: <rafael@...nel.org>, <viresh.kumar@...aro.org>, <pierre.gondois@....com>,
	<zhenglifeng1@...wei.com>, <ionela.voinescu@....com>, <lenb@...nel.org>,
	<robert.moore@...el.com>, <corbet@....net>, <rdunlap@...radead.org>,
	<ray.huang@....com>, <gautham.shenoy@....com>, <mario.limonciello@....com>,
	<perry.yuan@....com>, <zhanjie9@...ilicon.com>, <linux-pm@...r.kernel.org>,
	<linux-acpi@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<acpica-devel@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
CC: <linux-tegra@...r.kernel.org>, <treding@...dia.com>,
	<jonathanh@...dia.com>, <vsethi@...dia.com>, <ksitaraman@...dia.com>,
	<sanjayc@...dia.com>, <nhartman@...dia.com>, <bbasu@...dia.com>,
	<sumitg@...dia.com>
Subject: [PATCH v6 3/9] ACPI: CPPC: Rename EPP constants for clarity

Update EPP (Energy Performance Preference) constants for better clarity:
- Add CPPC_EPP_PERFORMANCE_PREF (0x00) for performance preference
- Rename CPPC_ENERGY_PERF_MAX to CPPC_EPP_ENERGY_EFFICIENCY_PREF (0xFF)
  for energy efficiency

Signed-off-by: Sumit Gupta <sumitg@...dia.com>
---
 drivers/acpi/cppc_acpi.c | 2 +-
 include/acpi/cppc_acpi.h | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 22d7fd669a6c..a09bdabaa804 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -1615,7 +1615,7 @@ EXPORT_SYMBOL_GPL(cppc_set_epp_perf);
  */
 int cppc_set_epp(int cpu, u64 epp_val)
 {
-	if (epp_val > CPPC_ENERGY_PERF_MAX)
+	if (epp_val > CPPC_EPP_ENERGY_EFFICIENCY_PREF)
 		return -EINVAL;
 
 	return cppc_set_reg_val(cpu, ENERGY_PERF, epp_val);
diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h
index 6573a759eb8d..4d644f03098e 100644
--- a/include/acpi/cppc_acpi.h
+++ b/include/acpi/cppc_acpi.h
@@ -39,7 +39,8 @@
 /* CPPC_AUTO_ACT_WINDOW_MAX_SIG is 127, so 128 and 129 will decay to 127 when writing */
 #define CPPC_AUTO_ACT_WINDOW_SIG_CARRY_THRESH 129
 
-#define CPPC_ENERGY_PERF_MAX	(0xFF)
+#define CPPC_EPP_PERFORMANCE_PREF		0x00
+#define CPPC_EPP_ENERGY_EFFICIENCY_PREF		0xFF
 
 /* Each register has the folowing format. */
 struct cpc_reg {
-- 
2.34.1