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

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Message-ID:
 <BY5PR07MB661209806C2A917385698B0DA1822@BY5PR07MB6612.namprd07.prod.outlook.com>
Date: Thu, 1 May 2025 23:37:48 +0000
From: Jason Mo <NukaColaM@...look.com>
To: Mario Limonciello <mario.limonciello@....com>
CC: "broonie@...nel.org" <broonie@...nel.org>, 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>
Subject: Re: sound: soc: amd: rpl: No ALSA DMIC capture interface for ACP6x
 (PCIe rev 62)

On Thu, May 1, 2025 at 05:16:00PM +0000, Mario Limonciello wrote:
> On 4/30/2025 7:30 PM, Mark Brown wrote:
>> 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.
>>
>
> Thanks for adding me.  This is a missing feature.  Let me explain the
> background though.  This report was filed with a system with "Dragon
> Range".  The IO die in "Dragon Range" is the exact same IO die as in
> "Raphael" which is what snd_rpl_pci_acp6x was developed for.
>
> "Raphael" is a pure desktop APU, there is never a DMIC connected to it.
> However for Dragon Range, this is used in mobile designs and as you can
> see you have a DMIC connected.
>
> So this would be some new development to add DMIC support.  I'll raise
> some discussions internally about it.
>
> BTW - We will also need to see your dmidecode output.  There aren't any
> ACPI _DSD properties to indicate the presence of a DMIC, so we'll need a
> quirk (similar to how we do quirks for Yellow Carp/Rembrandt which
> predated the introduction of _DSD properties).
>
> Thanks,
>

Thanks for the explanation.
Here is the requested output: 

$ sudo dmidecode -t baseboard
# dmidecode 3.6
Getting SMBIOS data from sysfs.
SMBIOS 3.4.0 present.

Handle 0x0002, DMI type 2, 16 bytes
Base Board Information
        Manufacturer: MECHREVO
        Product Name: MRID6-23
        Version: Base Board Version
        Serial Number: ML238A04LJ
        Asset Tag: Base Board Asset Tag
        Features:
                Board is a hosting board
                Board is replaceable
        Location In Chassis: Base Board Chassis Location
        Chassis Handle: 0x0003
        Type: Motherboard
        Contained Object Handles: 0

Handle 0x0028, DMI type 41, 11 bytes
Onboard Device
        Reference Designation: Realtek
        Type: Ethernet
        Status: Enabled
        Type Instance: 1
        Bus Address: 0000:03:00.0

Handle 0x0029, DMI type 41, 11 bytes
Onboard Device
        Reference Designation: Realtek ALC256
        Type: Sound
        Status: Enabled
        Type Instance: 1
        Bus Address: 00ff:ff:1f.7

>>>
>>> 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
>>
>>