linux-kernel - [PATCH] cpupower: Fix querying boost support for amd-pstate-epp mode

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Date:   Fri, 11 Aug 2023 16:35:01 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     <Perry.Yuan@....com>, <ray.huang@....com>, <wyes.karny@....com>,
        <trenn@...e.com>, <shuah@...nel.org>
CC:     <rafael.j.wysocki@...el.com>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Mario Limonciello <mario.limonciello@....com>,
        <chenhq2005@...il.com>
Subject: [PATCH] cpupower: Fix querying boost support for amd-pstate-epp mode

When running in active mode the driver for amd-pstate has -epp appended.
This throws off amd-pstate detection.

To detect amd-pstate look for the prefix instead.

Fixes: ffa5096a7c33 ("cpufreq: amd-pstate: implement Pstate EPP support for the AMD processors")
Reported-by: chenhq2005@...il.com
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217755
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 tools/power/cpupower/utils/helpers/misc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/power/cpupower/utils/helpers/misc.c b/tools/power/cpupower/utils/helpers/misc.c
index 9547b29254a7f..01c0440efe850 100644
--- a/tools/power/cpupower/utils/helpers/misc.c
+++ b/tools/power/cpupower/utils/helpers/misc.c
@@ -95,7 +95,7 @@ bool cpupower_amd_pstate_enabled(void)
 	if (!driver)
 		return ret;
 
-	if (!strcmp(driver, "amd-pstate"))
+	if (!strncmp(driver, "amd-pstate", 10))
 		ret = true;
 
 	cpufreq_put_driver(driver);
-- 
2.34.1