linux-kernel - sound: soc: amd: rpl: No ALSA DMIC capture interface for ACP6x (PCIe rev 62)

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Message-ID:
 <BY5PR07MB66126978095912E5D4A26E50A1802@BY5PR07MB6612.namprd07.prod.outlook.com>
Date: Tue, 29 Apr 2025 01:14:07 +0000
From: Jason Mo <NukaColaM@...look.com>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>
CC: "linux-sound@...r.kernel.org" <linux-sound@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: sound: soc: amd: rpl: No ALSA DMIC capture interface for ACP6x (PCIe
 rev 62)

Hi Liam, Mark,

The `sound/soc/amd/rpl/rpl-pci-acp6x.c` driver for AMD ACP6x (PCIe rev 62) appears to lack ALSA DMIC capture support, making the digital microphone unusable on affected hardware.

Hardware Details:
05:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] ACP/ACP3X/ACP6x Audio Coprocessor (rev 62)
        Subsystem: AIstone Global Limited Device 1301
        Kernel driver in use: snd_rpl_pci_acp6x
        Kernel modules: snd_pci_acp3x, snd_rn_pci_acp3x, snd_pci_acp5x, snd_pci_acp6x, snd_acp_pci, snd_rpl_pci_acp6x, ...

System Information:
Linux version 6.14.4-arch1-1 (linux@...hlinux) (gcc (GCC) 14.2.1 20250207, GNU ld (GNU Binutils) 2.44) #1 SMP PREEMPT_DYNAMIC Sat, 26 Apr 2025 00:06:37 +0000

Symptoms:
*   No corresponding sound card entry in `/proc/asound/cards`.
*   `arecord -l` shows no relevant capture device.
*   No related ALSA mixer controls are exposed.

Code Analysis:
The `rpl-pci-acp6x.c` driver handles basic PCIe initialization but seems to be missing the necessary ALSA/ASoC integration for capture. This contrasts with `sound/soc/amd/yc/pci-acp6x.c` (for rev 60/6f), which includes full ALSA DMIC support.

Attached Logs:
*   dmesg (full & filtered for audio)
*   lspci -vvnn (for audio device)
*   aplay -l / arecord -l
*   /proc/asound/cards
*   lsmod | grep snd

Question:
Is the missing DMIC support in the `rpl` driver for rev 62 intentional, or is this a bug/missing feature?

Happy to test patches or provide more info if DMIC support is planned or contributions are welcome.

Thanks,
Jason Mo

Download attachment "audio_logs_20250429_090217.tar.gz" of type "application/gzip" (24899 bytes)