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

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Message-ID: <aBLAwjELCoWNWDyH@finisterre.sirena.org.uk>
Date: Thu, 1 May 2025 09:30:58 +0900
From: Mark Brown <broonie@...nel.org>
To: Jason Mo <NukaColaM@...look.com>
Cc: Liam Girdwood <lgirdwood@...il.com>,
	"linux-sound@...r.kernel.org" <linux-sound@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mario Limonciello <mario.limonciello@....com>
Subject: Re: sound: soc: amd: rpl: No ALSA DMIC capture interface for ACP6x
 (PCIe rev 62)

On Tue, Apr 29, 2025 at 01:14:07AM +0000, Jason Mo wrote:
> 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.

Adding Mario.

> 
> 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



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