ASoC: sdw_utils: Add quirk for disabling capture ch

[niranjanhyti]

Amps can provide reference stream to hosts DSP which can be used for input audio proocessing. But some AMD HW doesn't
support such a feature and hence reference stream should be selectively disabled for those. This patch adds the following quirk for the same

• ASOC_SDW_CODEC_EXCLUDE_SPK_REF_STREAM

Suggested-by: Vijendar Mukunda Vijendar.Mukunda@amd.com

[sofci]

Can one of the admins verify this patch?

reply test this please to run this test once

[Copilot]

Copilot review overview

🟡 Changes recommended

DMI overrides discard the new quirk, while global codec metadata mutation can leak into unrelated card probes.

Review effort: Balanced
Findings: 2

Open (2)

• Preserve default amp capture exclusion when applying DMI quirks · New
• Avoid mutating shared codec metadata for per-card exclusions · New

What changed in this PR

Adds an AMD SoundWire quirk to suppress unsupported amplifier reference capture streams.

Changes:

• Defines the speaker-reference exclusion quirk.
• Adds a helper to disable amplifier capture directions.
• Enables the quirk for the AMD legacy machine driver.

File	Description
sound/​soc/​sdw_utils/​soc_sdw_utils.c	Adds the capture-disable helper.
sound/​soc/​amd/​acp/​acp-sdw-legacy-mach.c	Applies the new quirk during probing.
include/​sound/​soc_sdw_utils.h	Defines the quirk and exposes mutable directions/helper API.

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[bardliao]

codec_info_list[] provides the codec information and the machine driver can use the information to create the dai links it needs. IMHO, adding a quirk and set dais[j].direction[SNDRV_PCM_STREAM_CAPTURE] = false; is not the right way to fix the issue. I would suggest adding the link conditionally in create_sdw_dailink().
Something like

diff --git a/sound/soc/amd/acp/acp-sdw-legacy-mach.c b/sound/soc/amd/acp/acp-sdw-legacy-mach.c
index 6eac42bac855..9a975a3c7b97 100644
--- a/sound/soc/amd/acp/acp-sdw-legacy-mach.c
+++ b/sound/soc/amd/acp/acp-sdw-legacy-mach.c
@@ -254,6 +254,8 @@ static int create_sdw_dailink(struct snd_soc_card *card,
                list_for_each_entry(soc_end, &soc_dai->endpoints, list) {
                        if (!soc_end->dai_info->direction[stream])
                                continue;
+                       if (dais[j].dai_type == SOC_SDW_DAI_TYPE_AMP && stream == SNDRV_PCM_STREAM_CAPTURE)
+                               continue;

                        int link_num = ffs(soc_end->link_mask) - 1;