linux-kernel - [PATCH 1/2] ALSA: hda/realtek: Accelerate the front MIC charging and discharging of the 897 codec

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Message-Id: <20250804030518.424229-1-wangdich9700@163.com>
Date: Mon,  4 Aug 2025 11:05:17 +0800
From: wangdich9700@....com
To: lgirdwood@...il.com,
	broonie@...nel.org,
	perex@...ex.cz,
	tiwai@...e.com
Cc: linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org,
	linux-arm-kernel@...ts.infradead.org,
	wangdicheng <wangdicheng@...inos.cn>
Subject: [PATCH 1/2] ALSA: hda/realtek: Accelerate the front MIC charging and discharging of the 897 codec

From: wangdicheng <wangdicheng@...inos.cn>

The front MIC capacitance of the Inspur board is too large, resulting in a longer charging and discharging time required,
which in turn prevents recording for 5 seconds before startup.
Therefore, software is used to increase the delay by 2 seconds to avoid this issue.

Signed-off-by: wangdicheng <wangdicheng@...inos.cn>
---
 sound/pci/hda/patch_realtek.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 877137cb09ac..88675eae9447 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -1001,6 +1001,14 @@ static int alc_resume(struct hda_codec *codec)
 	if (!spec->no_depop_delay)
 		msleep(150); /* to avoid pop noise */
 	codec->patch_ops.init(codec);
+
+	if (codec->core.subsystem_id == 0x10ec1304) {
+		snd_hda_codec_write(codec, 0x19, 0, AC_VERB_SET_PIN_WIDGET_CONTROL, 0x04);
+		msleep(50);
+		snd_hda_codec_write(codec, 0x19, 0, AC_VERB_SET_PIN_WIDGET_CONTROL, 0x44);
+		msleep(2000);
+		snd_hda_codec_write(codec, 0x19, 0, AC_VERB_SET_PIN_WIDGET_CONTROL, PIN_VREF80);
+	}
 	snd_hda_regmap_sync(codec);
 	hda_call_check_power_status(codec, 0x01);
 	return 0;
-- 
2.25.1