platform/x86/amd/pmc: Notify user when platform does not support s0ix transition

Some of the AMD platforms do not support modern standby, so when such
CPU ID is detected, a warning message will be displayed to the user.

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Co-developed-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20250305142615.410178-1-Shyam-sundar.S-k@amd.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: Shyam Sundar S K

drivers/platform/x86/amd/pmc/pmc.c

@@ -808,6 +808,7 @@ static const struct pci_device_id pmc_pci_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_PCO) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_RV) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_SP) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_SHP) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M20H_ROOT) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M60H_ROOT) },
 	{ }
@@ -832,7 +833,7 @@ static int amd_pmc_probe(struct platform_device *pdev)
 
 	dev->cpu_id = rdev->device;
 
-	if (dev->cpu_id == AMD_CPU_ID_SP) {
+	if (dev->cpu_id == AMD_CPU_ID_SP || dev->cpu_id == AMD_CPU_ID_SHP) {
 		dev_warn_once(dev->dev, "S0i3 is not supported on this hardware\n");
 		err = -ENODEV;
 		goto err_pci_dev_put;

drivers/platform/x86/amd/pmc/pmc.h

@@ -79,6 +79,7 @@ void amd_mp2_stb_deinit(struct amd_pmc_dev *dev);
 #define AMD_CPU_ID_CB			0x14D8
 #define AMD_CPU_ID_PS			0x14E8
 #define AMD_CPU_ID_SP			0x14A4
+#define AMD_CPU_ID_SHP			0x153A
 #define PCI_DEVICE_ID_AMD_1AH_M20H_ROOT 0x1507
 #define PCI_DEVICE_ID_AMD_1AH_M60H_ROOT 0x1122
 #define PCI_DEVICE_ID_AMD_MP2_STB	0x172c