[PATCH 2/3] platform/x86/amd: pmf: Add infrastructure for quirking supported funcs

[Mario Limonciello <mario.limonciello@xxxxxxx>]

In the event of a BIOS bug add infrastructure that will be utilized
to override the return value for supported_funcs to avoid enabling
features.

Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
 drivers/platform/x86/amd/pmf/Makefile     |  2 +-
 drivers/platform/x86/amd/pmf/acpi.c       |  5 ++-
 drivers/platform/x86/amd/pmf/core.c       |  1 +
 drivers/platform/x86/amd/pmf/pmf-quirks.c | 43 +++++++++++++++++++++++
 drivers/platform/x86/amd/pmf/pmf.h        |  3 ++
 5 files changed, 52 insertions(+), 2 deletions(-)
 create mode 100644 drivers/platform/x86/amd/pmf/pmf-quirks.c

diff --git a/drivers/platform/x86/amd/pmf/Makefile b/drivers/platform/x86/amd/pmf/Makefile
index 6b26e48ce8ad..7d6079b02589 100644
--- a/drivers/platform/x86/amd/pmf/Makefile
+++ b/drivers/platform/x86/amd/pmf/Makefile
@@ -7,4 +7,4 @@
 obj-$(CONFIG_AMD_PMF) += amd-pmf.o
 amd-pmf-objs := core.o acpi.o sps.o \
 		auto-mode.o cnqf.o \
-		tee-if.o spc.o
+		tee-if.o spc.o pmf-quirks.o
diff --git a/drivers/platform/x86/amd/pmf/acpi.c b/drivers/platform/x86/amd/pmf/acpi.c
index 60fc71c9fb0f..1157ec148880 100644
--- a/drivers/platform/x86/amd/pmf/acpi.c
+++ b/drivers/platform/x86/amd/pmf/acpi.c
@@ -343,7 +343,10 @@ static int apmf_if_verify_interface(struct amd_pmf_dev *pdev)
 	if (err)
 		return err;
 
-	pdev->supported_func = output.supported_functions;
+	/* only set if not already set by a quirk */
+	if (!pdev->supported_func)
+		pdev->supported_func = output.supported_functions;
+
 	dev_dbg(pdev->dev, "supported functions:0x%x notifications:0x%x version:%u\n",
 		output.supported_functions, output.notification_mask, output.version);
 
diff --git a/drivers/platform/x86/amd/pmf/core.c b/drivers/platform/x86/amd/pmf/core.c
index 5d4f80698a8b..64e6e34a2a9a 100644
--- a/drivers/platform/x86/amd/pmf/core.c
+++ b/drivers/platform/x86/amd/pmf/core.c
@@ -445,6 +445,7 @@ static int amd_pmf_probe(struct platform_device *pdev)
 	mutex_init(&dev->lock);
 	mutex_init(&dev->update_mutex);
 
+	amd_pmf_quirks_init(dev);
 	apmf_acpi_init(dev);
 	platform_set_drvdata(pdev, dev);
 	amd_pmf_dbgfs_register(dev);
diff --git a/drivers/platform/x86/amd/pmf/pmf-quirks.c b/drivers/platform/x86/amd/pmf/pmf-quirks.c
new file mode 100644
index 000000000000..9f3790eaaa30
--- /dev/null
+++ b/drivers/platform/x86/amd/pmf/pmf-quirks.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * AMD Platform Management Framework Driver Quirks
+ *
+ * Copyright (c) 2024, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Mario Limonciello <mario.limonciello@xxxxxxx>
+ */
+
+#include <linux/dmi.h>
+
+#include "pmf.h"
+
+struct quirk_entry {
+	u32 supported_func;
+};
+
+static struct quirk_entry quirk_no_sps_bug = {
+	.supported_func = 0x4003,
+};
+
+static const struct dmi_system_id fwbug_list[] = {
+	{}
+};
+
+void amd_pmf_quirks_init(struct amd_pmf_dev *dev)
+{
+	const struct dmi_system_id *dmi_id;
+	struct quirk_entry *quirks;
+
+	dmi_id = dmi_first_match(fwbug_list);
+	if (!dmi_id)
+		return;
+
+	quirks = dmi_id->driver_data;
+	if (quirks->supported_func) {
+		dev->supported_func = quirks->supported_func;
+		pr_info("Using supported funcs quirk to avoid %s platform firmware bug\n",
+			dmi_id->ident);
+	}
+}
+
diff --git a/drivers/platform/x86/amd/pmf/pmf.h b/drivers/platform/x86/amd/pmf/pmf.h
index 8c4df5753f40..eeedd0c0395a 100644
--- a/drivers/platform/x86/amd/pmf/pmf.h
+++ b/drivers/platform/x86/amd/pmf/pmf.h
@@ -720,4 +720,7 @@ int apmf_check_smart_pc(struct amd_pmf_dev *pmf_dev);
 void amd_pmf_populate_ta_inputs(struct amd_pmf_dev *dev, struct ta_pmf_enact_table *in);
 void amd_pmf_dump_ta_inputs(struct amd_pmf_dev *dev, struct ta_pmf_enact_table *in);
 
+/* Quirk infrastructure */
+void amd_pmf_quirks_init(struct amd_pmf_dev *dev);
+
 #endif /* PMF_H */
-- 
2.34.1