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authorMario Limonciello <mario.limonciello@amd.com>2021-06-17 11:42:12 -0500
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2021-06-18 18:39:54 +0200
commit8fbd6c15ea0a1d5e5d4e8ce4cc31e31afbcc1678 (patch)
treeda35b604766452da07549de88e14e8fcc6706940 /drivers/acpi
parent5dbf509975780851251361f2db287fdce11b7cae (diff)
ACPI: PM: Adjust behavior for field problems on AMD systems
Some AMD Systems with uPEP _HID AMD004/AMDI005 have an off by one bug in their function mask return. This means that they will call entrance but not exit for matching functions. Other AMD systems with this HID should use the Microsoft generic UUID. AMD systems with uPEP HID AMDI006 should be using the Microsoft method. Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Tested-by: Julian Sikorski <belegdol@gmail.com> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/x86/s2idle.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/acpi/x86/s2idle.c b/drivers/acpi/x86/s2idle.c
index 3f2a90648ec9..816bf2c34b7a 100644
--- a/drivers/acpi/x86/s2idle.c
+++ b/drivers/acpi/x86/s2idle.c
@@ -371,12 +371,27 @@ static int lps0_device_attach(struct acpi_device *adev,
return 0;
if (acpi_s2idle_vendor_amd()) {
+ /* AMD0004, AMDI0005:
+ * - Should use rev_id 0x0
+ * - function mask > 0x3: Should use AMD method, but has off by one bug
+ * - function mask = 0x3: Should use Microsoft method
+ * AMDI0006:
+ * - should use rev_id 0x0
+ * - function mask = 0x3: Should use Microsoft method
+ */
+ const char *hid = acpi_device_hid(adev);
rev_id = 0;
lps0_dsm_func_mask = validate_dsm(adev->handle,
ACPI_LPS0_DSM_UUID_AMD, rev_id, &lps0_dsm_guid);
lps0_dsm_func_mask_microsoft = validate_dsm(adev->handle,
ACPI_LPS0_DSM_UUID_MICROSOFT, rev_id,
&lps0_dsm_guid_microsoft);
+ if (lps0_dsm_func_mask > 0x3 && (!strcmp(hid, "AMD0004") ||
+ !strcmp(hid, "AMDI0005"))) {
+ lps0_dsm_func_mask = (lps0_dsm_func_mask << 1) | 0x1;
+ acpi_handle_debug(adev->handle, "_DSM UUID %s: Adjusted function mask: 0x%x\n",
+ ACPI_LPS0_DSM_UUID_AMD, lps0_dsm_func_mask);
+ }
} else {
rev_id = 1;
lps0_dsm_func_mask = validate_dsm(adev->handle,