Allow detecting ACP6x DMIC via _DSD

Merge series from Mario Limonciello <mario.limonciello@amd.com>:

It's not possible to probe for the presence of a DMIC, so the ACP6x
machine driver currently has a hardcoded list of all the systems known
to have a DMIC connected to the ACP.

Although this design works it means that the acp6x driver needs to always
grow with more systems and worse, if an OEM introduces a new system there
will be a mismatch in time that even if the driver (otherwise) works fine
it needs their system added to the list to work.

So this series introduces a _DSD that OEMs can populate into the BIOS to
indicate presence of a DMIC.

sound/soc/amd/yc/acp6x-mach.c

@@ -12,6 +12,7 @@
 #include <sound/pcm_params.h>
 #include <linux/io.h>
 #include <linux/dmi.h>
+#include <linux/acpi.h>
 
 #include "acp6x.h"
 
@@ -45,108 +46,126 @@ static struct snd_soc_card acp6x_card = {
 
 static const struct dmi_system_id yc_acp_quirk_table[] = {
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21D2"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21D3"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21D4"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21D5"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21CF"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21CG"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21CQ"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21CR"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21AW"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21AX"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21BN"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21BQ"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21CH"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21CJ"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21CK"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21CL"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21D8"),
 		}
 	},
 	{
+		.driver_data = &acp6x_card,
 		.matches = {
 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "21D9"),
@@ -157,18 +176,33 @@ static const struct dmi_system_id yc_acp_quirk_table[] = {
 
 static int acp6x_probe(struct platform_device *pdev)
 {
+	const struct dmi_system_id *dmi_id;
 	struct acp6x_pdm *machine = NULL;
 	struct snd_soc_card *card;
+	struct acpi_device *adev;
 	int ret;
-	const struct dmi_system_id *dmi_id;
 
+	/* check the parent device's firmware node has _DSD or not */
+	adev = ACPI_COMPANION(pdev->dev.parent);
+	if (adev) {
+		const union acpi_object *obj;
+
+		if (!acpi_dev_get_property(adev, "AcpDmicConnected", ACPI_TYPE_INTEGER, &obj) &&
+		    obj->integer.value == 1)
+			platform_set_drvdata(pdev, &acp6x_card);
+	}
+
+	/* check for any DMI overrides */
 	dmi_id = dmi_first_match(yc_acp_quirk_table);
-	if (!dmi_id)
+	if (dmi_id)
+		platform_set_drvdata(pdev, dmi_id->driver_data);
+
+	card = platform_get_drvdata(pdev);
+	if (!card)
 		return -ENODEV;
-	card = &acp6x_card;
+	dev_info(&pdev->dev, "Enabling ACP DMIC support via %s", dmi_id ? "DMI" : "ACPI");
 	acp6x_card.dev = &pdev->dev;
 
-	platform_set_drvdata(pdev, card);
 	snd_soc_card_set_drvdata(card, machine);
 	ret = devm_snd_soc_register_card(&pdev->dev, card);
 	if (ret) {