soundwire: Intel: introduce DMI quirks for HP Spectre x360 Convertible

HP Spectre x360 Convertible devices expose invalid _ADR fields in the
DSDT, which prevents codec drivers from probing. A possible solution
is to override the DSDT, but that's just too painful for users.

This patch suggests a simple DMI-based quirk to remap the existing
invalid ADR information into valid ones.

BugLink: https://github.com/thesofproject/linux/issues/2700
Co-developed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20210302075105.11515-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/Makefile

@@ -20,7 +20,7 @@ soundwire-cadence-y := cadence_master.o
 obj-$(CONFIG_SOUNDWIRE_CADENCE) += soundwire-cadence.o
 
 #Intel driver
-soundwire-intel-y :=	intel.o intel_init.o
+soundwire-intel-y :=	intel.o intel_init.o dmi-quirks.o
 obj-$(CONFIG_SOUNDWIRE_INTEL) += soundwire-intel.o
 
 #Qualcomm driver

drivers/soundwire/bus.h

@@ -7,6 +7,8 @@
 #define DEFAULT_BANK_SWITCH_TIMEOUT 3000
 #define DEFAULT_PROBE_TIMEOUT       2000
 
+u64 sdw_dmi_override_adr(struct sdw_bus *bus, u64 addr);
+
 #if IS_ENABLED(CONFIG_ACPI)
 int sdw_acpi_find_slaves(struct sdw_bus *bus);
 #else

drivers/soundwire/dmi-quirks.c

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+// Copyright(c) 2021 Intel Corporation.
+
+/*
+ * Soundwire DMI quirks
+ */
+
+#include <linux/device.h>
+#include <linux/dmi.h>
+#include <linux/soundwire/sdw.h>
+#include "bus.h"
+
+struct adr_remap {
+	u64 adr;
+	u64 remapped_adr;
+};
+
+/*
+ * HP Spectre 360 Convertible devices do not expose the correct _ADR
+ * in the DSDT.
+ * Remap the bad _ADR values to the ones reported by hardware
+ */
+static const struct adr_remap hp_spectre_360[] = {
+	{
+		0x000010025D070100,
+		0x000020025D071100
+	},
+	{
+		0x000110025d070100,
+		0x000120025D130800
+	},
+	{}
+};
+
+static const struct dmi_system_id adr_remap_quirk_table[] = {
+	{
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "HP Spectre x360 Convertible"),
+		},
+		.driver_data = (void *)hp_spectre_360,
+	},
+	{}
+};
+
+u64 sdw_dmi_override_adr(struct sdw_bus *bus, u64 addr)
+{
+	const struct dmi_system_id *dmi_id;
+
+	/* check if any address remap quirk applies */
+	dmi_id = dmi_first_match(adr_remap_quirk_table);
+	if (dmi_id) {
+		struct adr_remap *map = dmi_id->driver_data;
+
+		for (map = dmi_id->driver_data; map->adr; map++) {
+			if (map->adr == addr) {
+				dev_dbg(bus->dev, "remapped _ADR 0x%llx as 0x%llx\n",
+					addr, map->remapped_adr);
+				addr = map->remapped_adr;
+				break;
+			}
+		}
+	}
+
+	return addr;
+}

drivers/soundwire/intel.c

@@ -1302,6 +1302,7 @@ static int intel_prop_read(struct sdw_bus *bus)
 
 static struct sdw_master_ops sdw_intel_ops = {
 	.read_prop = sdw_master_read_prop,
+	.override_adr = sdw_dmi_override_adr,
 	.xfer_msg = cdns_xfer_msg,
 	.xfer_msg_defer = cdns_xfer_msg_defer,
 	.reset_page_addr = cdns_reset_page_addr,