linux-kernel - [PATCH AUTOSEL 5.18 13/22] platform/x86: thinkpad_acpi: do not use PSC mode on Intel platforms

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Date:   Wed,  6 Jul 2022 11:30:31 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Mark Pearson <markpearson@...ovo.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Sasha Levin <sashal@...nel.org>, hmh@....eng.br,
        markgross@...nel.org, ibm-acpi-devel@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org
Subject: [PATCH AUTOSEL 5.18 13/22] platform/x86: thinkpad_acpi: do not use PSC mode on Intel platforms

From: Mark Pearson <markpearson@...ovo.com>

[ Upstream commit bce6243f767f7da88aa4674d5d678f9f156eaba9 ]

PSC platform profile mode is only supported on Linux for AMD platforms.

Some older Intel platforms (e.g T490) are advertising it's capability
as Windows uses it - but on Linux we should only be using MMC profile
for Intel systems.

Add a check to prevent it being enabled incorrectly.

Signed-off-by: Mark Pearson <markpearson@...ovo.com>
Link: https://lore.kernel.org/r/20220627181449.3537-1-markpearson@lenovo.com
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/platform/x86/thinkpad_acpi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 5d1e0a3a5c1e..832ab77ab961 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -10540,6 +10540,11 @@ static int tpacpi_dytc_profile_init(struct ibm_init_struct *iibm)
 				dytc_mmc_get_available = true;
 		}
 	} else if (dytc_capabilities & BIT(DYTC_FC_PSC)) { /* PSC MODE */
+		/* Support for this only works on AMD platforms */
+		if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) {
+			dbg_printk(TPACPI_DBG_INIT, "PSC not support on Intel platforms\n");
+			return -ENODEV;
+		}
 		pr_debug("PSC is supported\n");
 	} else {
 		dbg_printk(TPACPI_DBG_INIT, "No DYTC support available\n");
-- 
2.35.1