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

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Message-ID: <a08967df-a7cc-499b-94a4-125f9dbf05bf@amd.com>
Date: Thu, 1 May 2025 12:16:50 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Mark Brown <broonie@...nel.org>, 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>
Subject: Re: sound: soc: amd: rpl: No ALSA DMIC capture interface for ACP6x
 (PCIe rev 62)

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,

>>
>> 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
> 
>