ASoC: amd: Add support for enabling DMIC on acp6x via _DSD

Currently the acp6x machine driver requires a hardcoded list of systems
that physically have DMIC connected.

To avoid having to continually add to an evergrowing list of systems add
support for a _DSD that can advertise this.

OEMs can add this _DSD to their BIOS under the ACP device to automatically
add the device to this driver without requiring any driver modifications.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20220411134532.13538-3-mario.limonciello@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/amd/yc/acp6x-mach.c b/sound/soc/amd/yc/acp6x-mach.c
index 959b70e..f06e6c1 100644 (file)
--- a/sound/soc/amd/yc/acp6x-mach.c
+++ b/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"
 
@@ -178,8 +179,19 @@ 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;
 
+       /* 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)
@@ -188,6 +200,7 @@ static int acp6x_probe(struct platform_device *pdev)
        card = platform_get_drvdata(pdev);
        if (!card)
                return -ENODEV;
+       dev_info(&pdev->dev, "Enabling ACP DMIC support via %s", dmi_id ? "DMI" : "ACPI");
        acp6x_card.dev = &pdev->dev;
 
        snd_soc_card_set_drvdata(card, machine);