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>

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index b4d6a356b7462ce5b3363aa973afdd7c59a6b9a9..a8b383051528517a452b2a13e60f55c908d94f26 100644 (file)
--- 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");