restore auto-mute mode for Dell Chrome platform

[Kailang <kailang@realtek.com>]

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Hi Takashi,

Attach patch was approved by Google guy.

BR,
Kailang

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From 666477e29df30398dc0922a383f23543ccd3513c Mon Sep 17 00:00:00 2001
From: Kailang Yang <kailang@realtek.com>
Date: Fri, 16 May 2025 14:53:37 +0800
Subject: [PATCH] ALSA: hda/realtek - restore auto-mute mode for Dell Chrome platform

This board need to shutdown Class-D amp to avoid EMI issue.
Restore the Auto-Mute mode item will off pin control when Auto-mute mode was enable.

Signed-off-by: Kailang Yang <kailang@realtek.com>

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 877137cb09ac..2eadee7f9b38 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -6811,7 +6811,10 @@ static void alc256_fixup_chromebook(struct hda_codec *codec,
 
 	switch (action) {
 	case HDA_FIXUP_ACT_PRE_PROBE:
-		spec->gen.suppress_auto_mute = 1;
+		if (codec->core.subsystem_id == 0x10280d76)
+			spec->gen.suppress_auto_mute = 0;
+		else
+			spec->gen.suppress_auto_mute = 1;
 		spec->gen.suppress_auto_mic = 1;
 		spec->en_3kpull_low = false;
 		break;