The ASUS Vivobook 18 M1807GA (AMD ACP7.x, PCI 1022:15e2, subsystem
1043:3531) exposes a single Realtek RT721 SDCA codec on SoundWire link 1.
The BIOS reports the ACP audio config flag as 0 (SoundWire mode), so
snd_pci_ps claims the device, brings up the SoundWire managers and
enumerates the RT721 peripheral (sdw:0:1:025d:0721:01); the rt721-sdca
codec driver binds successfully.

No sound card is created, however: acp63_sdw_machine_select() walks
snd_soc_acpi_amd_acp70_sdw_machines[] and finds no entry whose declared
SoundWire peripherals are all present on the bus. The only existing RT721
entry, acp70_rt721_l1u0_tas2783x2_l1u8b, additionally requires two
TAS2783 amplifiers and deliberately exposes the RT721 as jack + DMIC
only. This M1807GA variant has no external amplifiers - the RT721's
internal AIF2 amplifier path drives the speakers - so that entry never
matches and no machine device is registered.

Add a standalone RT721 machine entry for link 1 exposing all three RT721
endpoints (jack/AIF1, speaker amplifier/AIF2, DMIC/AIF3), mirroring the
standalone RT722 configuration. Place it after the TAS2783 combo entry so
platforms that do have the external amplifiers continue to match the more
specific entry first.

ACPI _ADR of the codec: 0x000130025D072101
(link_id=1 version=3 mfg_id=0x025d Realtek part_id=0x0721 class=0x01).

Verified on the hardware: with the entry present the amd_sdw machine
binds, an "amd-soundwire" card is registered exposing the rt721-sdca
AIF1 (SimpleJack) and AIF2 (SmartAmp) PCM devices, and audio plays out
of the built-in speakers.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=221282
Signed-off-by: Aleksander Pshenitsyn <brains.fatman@gmail.com>
---
 sound/soc/amd/acp/amd-acp70-acpi-match.c | 44 ++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/sound/soc/amd/acp/amd-acp70-acpi-match.c b/sound/soc/amd/acp/amd-acp70-acpi-match.c
index 1ae43df..18f2918 100644
--- a/sound/soc/amd/acp/amd-acp70-acpi-match.c
+++ b/sound/soc/amd/acp/amd-acp70-acpi-match.c
@@ -619,6 +619,45 @@ static const struct snd_soc_acpi_link_adr acp70_rt721_l1u0_tas2783x2_l1u8b[] = {
 	{}
 };
 
+static const struct snd_soc_acpi_endpoint rt721_endpoints[] = {
+	{ /* Jack Playback/Capture Endpoint (AIF1) */
+		.num = 0,
+		.aggregated = 0,
+		.group_position = 0,
+		.group_id = 0,
+	},
+	{ /* Speaker Amplifier Endpoint (AIF2, internal amp) */
+		.num = 1,
+		.aggregated = 0,
+		.group_position = 0,
+		.group_id = 0,
+	},
+	{ /* DMIC Capture Endpoint (AIF3) */
+		.num = 2,
+		.aggregated = 0,
+		.group_position = 0,
+		.group_id = 0,
+	},
+};
+
+static const struct snd_soc_acpi_adr_device rt721_1_single_adr[] = {
+	{
+		.adr = 0x000130025D072101ull,
+		.num_endpoints = ARRAY_SIZE(rt721_endpoints),
+		.endpoints = rt721_endpoints,
+		.name_prefix = "rt721"
+	}
+};
+
+static const struct snd_soc_acpi_link_adr acp70_rt721_only[] = {
+	{
+		.mask = BIT(1),
+		.num_adr = ARRAY_SIZE(rt721_1_single_adr),
+		.adr_d = rt721_1_single_adr,
+	},
+	{}
+};
+
 struct snd_soc_acpi_mach snd_soc_acpi_amd_acp70_sdw_machines[] = {
 	{
 		.link_mask = BIT(0) | BIT(1),
@@ -711,6 +750,11 @@ struct snd_soc_acpi_mach snd_soc_acpi_amd_acp70_sdw_machines[] = {
 		.links = acp70_rt721_l1u0_tas2783x2_l1u8b,
 		.drv_name = "amd_sdw",
 	},
+	{
+		.link_mask = BIT(1),
+		.links = acp70_rt721_only,
+		.drv_name = "amd_sdw",
+	},
 	{},
 };
 EXPORT_SYMBOL(snd_soc_acpi_amd_acp70_sdw_machines);
-- 
2.53.0

On Sun, 31 May 2026 13:11:59 +0300, Aleksander Pshenitsyn wrote:
> ASoC: amd: acp70: add standalone RT721 SoundWire machine

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-7.1

Thanks!

[1/1] ASoC: amd: acp70: add standalone RT721 SoundWire machine
      https://git.kernel.org/broonie/sound/c/d2dcd85f9e09

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark