[PATCH v4 10/11] platform/x86/amd/pmf: Force load driver on older supported platforms

[Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>]

Some of the older platforms with _HID "AMDI0100" PMF driver can be force
loaded by interested users but only for experimental purposes.

Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>
---
 drivers/platform/x86/amd/pmf/core.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/platform/x86/amd/pmf/core.c b/drivers/platform/x86/amd/pmf/core.c
index 4467d682cd11..dbca5d7c6311 100644
--- a/drivers/platform/x86/amd/pmf/core.c
+++ b/drivers/platform/x86/amd/pmf/core.c
@@ -39,6 +39,7 @@
 #define AMD_PMF_RESULT_FAILED                0xFF
 
 /* List of supported CPU ids */
+#define AMD_CPU_ID_RMB			0x14b5
 #define AMD_CPU_ID_PS			0x14e8
 
 #define PMF_MSG_DELAY_MIN_US		50
@@ -52,6 +53,11 @@ static int metrics_table_loop_ms = 1000;
 module_param(metrics_table_loop_ms, int, 0644);
 MODULE_PARM_DESC(metrics_table_loop_ms, " Metrics Table sample size time (default = 1000ms) ");
 
+/* Force load on supported older platforms */
+static bool force_load;
+module_param(force_load, bool, 0444);
+MODULE_PARM_DESC(force_load, " Force load this driver on supported older platforms (experimental) ");
+
 static int current_power_limits_show(struct seq_file *seq, void *unused)
 {
 	struct amd_pmf_dev *dev = seq->private;
@@ -208,6 +214,7 @@ int amd_pmf_send_cmd(struct amd_pmf_dev *dev, u8 message, bool get, u32 arg, u32
 }
 
 static const struct pci_device_id pmf_pci_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_RMB) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_PS) },
 	{ }
 };
@@ -265,6 +272,7 @@ static void amd_pmf_deinit_features(struct amd_pmf_dev *dev)
 }
 
 static const struct acpi_device_id amd_pmf_acpi_ids[] = {
+	{"AMDI0100", 0x100},
 	{"AMDI0102", 0},
 	{ }
 };
@@ -272,6 +280,7 @@ MODULE_DEVICE_TABLE(acpi, amd_pmf_acpi_ids);
 
 static int amd_pmf_probe(struct platform_device *pdev)
 {
+	const struct acpi_device_id *id;
 	struct amd_pmf_dev *dev;
 	struct pci_dev *rdev;
 	u32 base_addr_lo;
@@ -280,6 +289,13 @@ static int amd_pmf_probe(struct platform_device *pdev)
 	u32 val;
 	int err;
 
+	id = acpi_match_device(amd_pmf_acpi_ids, &pdev->dev);
+	if (!id)
+		return -ENODEV;
+
+	if (id->driver_data == 0x100 && !force_load)
+		return -ENODEV;
+
 	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 	if (!dev)
 		return -ENOMEM;
-- 
2.25.1