linux-kernel - [PATCH v2] platform/x86: thinkpad_acpi: Explicitly set to balanced mode on startup

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Date:   Fri, 19 Aug 2022 13:01:00 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Mark Pearson <markpearson@...ovo.com>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>
CC:     Mario Limonciello <mario.limonciello@....com>, <madcatx@...as.cz>,
        <ibm-acpi-devel@...ts.sourceforge.net>,
        <platform-driver-x86@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] platform/x86: thinkpad_acpi: Explicitly set to balanced mode on startup

It was observed that on a Thinkpad T14 Gen1 (AMD) that the platform
profile is starting up in 'low-power' mode after refreshing what the
firmware had.  This is most likely a firmware bug, but as a harmless
workaround set the default profile to 'balanced' at thinkpad_acpi startup.

Reported-by: madcatx@...as.cz
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216347
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
v1->v2
 * Only run on AMD systems (PSC mode)

 drivers/platform/x86/thinkpad_acpi.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 22d4e8633e30..2dbb9fc011a7 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -10592,10 +10592,9 @@ static int tpacpi_dytc_profile_init(struct ibm_init_struct *iibm)
 	/* Ensure initial values are correct */
 	dytc_profile_refresh();
 
-	/* Set AMT correctly now we know current profile */
-	if ((dytc_capabilities & BIT(DYTC_FC_PSC)) &&
-	    (dytc_capabilities & BIT(DYTC_FC_AMT)))
-	    dytc_control_amt(dytc_current_profile == PLATFORM_PROFILE_BALANCED);
+	/* Workaround for https://bugzilla.kernel.org/show_bug.cgi?id=216347 */
+	if (dytc_capabilities & BIT(DYTC_FC_PSC))
+		dytc_profile_set(NULL, PLATFORM_PROFILE_BALANCED);
 
 	return 0;
 }
-- 
2.34.1