From bce6243f767f7da88aa4674d5d678f9f156eaba9 Mon Sep 17 00:00:00 2001
From: Mark Pearson <markpearson@lenovo.com>
Date: Mon, 27 Jun 2022 14:14:49 -0400
Subject: [PATCH] platform/x86: thinkpad_acpi: do not use PSC mode on Intel
platforms
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@lenovo.com>
Link: https://lore.kernel.org/r/20220627181449.3537-1-markpearson@lenovo.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
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 b4d6a356b7462..a8b3830515285 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -10541,6 +10541,11 @@ 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");
--
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