linux-kernel - [PATCH 2/2] ACPI: PM: Include alternate AMDI0005 id in special behaviour

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Date:   Sat,  2 Oct 2021 14:18:40 +1000
From:   Sachi King <nakato@...ato.io>
To:     Shyam-sundar.S-k@....com, hdegoede@...hat.com,
        mgross@...ux.intel.com, mario.limonciello@....com,
        rafael@...nel.org, lenb@...nel.org
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, Sachi King <nakato@...ato.io>,
        stable@...r.kernel.org
Subject: [PATCH 2/2] ACPI: PM: Include alternate AMDI0005 id in special behaviour

The Surface Laptop 4 AMD has used the AMD0005 to identify this
controller instead of using the appropriate ACPI ID AMDI0005.  The
AMD0005 needs the same special casing as AMDI0005.

Cc: <stable@...r.kernel.org> # 5.14+
Signed-off-by: Sachi King <nakato@...ato.io>
---
 drivers/acpi/x86/s2idle.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/x86/s2idle.c b/drivers/acpi/x86/s2idle.c
index bd92b549fd5a..1c48358b43ba 100644
--- a/drivers/acpi/x86/s2idle.c
+++ b/drivers/acpi/x86/s2idle.c
@@ -371,7 +371,7 @@ static int lps0_device_attach(struct acpi_device *adev,
 		return 0;
 
 	if (acpi_s2idle_vendor_amd()) {
-		/* AMD0004, AMDI0005:
+		/* AMD0004, AMD0005, 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
@@ -390,6 +390,7 @@ static int lps0_device_attach(struct acpi_device *adev,
 					ACPI_LPS0_DSM_UUID_MICROSOFT, 0,
 					&lps0_dsm_guid_microsoft);
 		if (lps0_dsm_func_mask > 0x3 && (!strcmp(hid, "AMD0004") ||
+						 !strcmp(hid, "AMD0005") ||
 						 !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",
-- 
2.33.0