platform/x86: amd: pmc: provide user message where s0ix is not supported

Some platforms do not support hardware backed s0i3 transitions. When such
CPUs are detected, provide a warning message to the user.

Suggested-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20230412111500.2602529-1-Shyam-sundar.S-k@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Author: Shyam Sundar S K

drivers/platform/x86/amd/pmc.c

@@ -94,6 +94,7 @@
 #define AMD_CPU_ID_YC			0x14B5
 #define AMD_CPU_ID_CB			0x14D8
 #define AMD_CPU_ID_PS			0x14E8
+#define AMD_CPU_ID_SP			0x14A4
 
 #define PMC_MSG_DELAY_MIN_US		50
 #define RESPONSE_REGISTER_LOOP_MAX	20000
@@ -886,6 +887,7 @@ static const struct pci_device_id pmc_pci_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_RN) },
 	{ 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) },
 	{ }
 };
 
@@ -964,6 +966,13 @@ static int amd_pmc_probe(struct platform_device *pdev)
 	}
 
 	dev->cpu_id = rdev->device;
+
+	if (dev->cpu_id == AMD_CPU_ID_SP) {
+		dev_warn_once(dev->dev, "S0i3 is not supported on this hardware\n");
+		err = -ENODEV;
+		goto err_pci_dev_put;
+	}
+
 	dev->rdev = rdev;
 	err = amd_smn_read(0, AMD_PMC_BASE_ADDR_LO, &val);
 	if (err) {