linux-kernel - Re: [PATCH] ALSA: hda/realtek: Fix quirk for TongFang PHxTxX1

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Date:   Thu, 2 Dec 2021 16:35:23 +0100
From:   Werner Sembach <wse@...edocomputers.com>
To:     perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: hda/realtek: Fix quirk for TongFang PHxTxX1

Am 02.12.21 um 16:28 schrieb Werner Sembach:
> This fixes the SND_PCI_QUIRK(...) of the TongFang PHxTxX1 barebone. This
> fixes the issue of sound not working after s3 suspend.
>
> When waking up from s3 suspend the Coef 0x10 is set to 0x0220 instead of
> 0x0020. Setting the value manually makes the sound work again. This patch
> does this automatically.
An educational question: Is there any, at least partial, documentation available on what these Coef values actually do
besides https://www.kernel.org/doc/html/v5.15/sound/hd-audio/realtek-pc-beep.html ?
>
> While being on it, I also fixed the comment formatting of the quirk.
>
> Signed-off-by: Werner Sembach <wse@...edocomputers.com>
> Cc: <stable@...r.kernel.org>
> ---
>  sound/pci/hda/patch_realtek.c | 25 ++++++++++++++-----------
>  1 file changed, 14 insertions(+), 11 deletions(-)
>
> diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
> index 9ce7457533c96..d3a16843c7afd 100644
> --- a/sound/pci/hda/patch_realtek.c
> +++ b/sound/pci/hda/patch_realtek.c
> @@ -6503,22 +6503,25 @@ static void alc287_fixup_legion_15imhg05_speakers(struct hda_codec *codec,
>  /* for alc285_fixup_ideapad_s740_coef() */
>  #include "ideapad_s740_helper.c"
>  
> +static const struct coef_fw alc256_fixup_tongfang_reset_persistent_settings_coefs[] = {
> +	WRITE_COEF(0x10, 0x0020), WRITE_COEF(0x24, 0x0000), WRITE_COEF(0x26, 0x0000),
> +	WRITE_COEF(0x29, 0x3000), WRITE_COEF(0x37, 0xfe05), WRITE_COEF(0x45, 0x5089),
> +	{}
> +};
> +
>  static void alc256_fixup_tongfang_reset_persistent_settings(struct hda_codec *codec,
>  							    const struct hda_fixup *fix,
>  							    int action)
>  {
>  	/*
> -	* A certain other OS sets these coeffs to different values. On at least one TongFang
> -	* barebone these settings might survive even a cold reboot. So to restore a clean slate the
> -	* values are explicitly reset to default here. Without this, the external microphone is
> -	* always in a plugged-in state, while the internal microphone is always in an unplugged
> -	* state, breaking the ability to use the internal microphone.
> -	*/
> -	alc_write_coef_idx(codec, 0x24, 0x0000);
> -	alc_write_coef_idx(codec, 0x26, 0x0000);
> -	alc_write_coef_idx(codec, 0x29, 0x3000);
> -	alc_write_coef_idx(codec, 0x37, 0xfe05);
> -	alc_write_coef_idx(codec, 0x45, 0x5089);
> +	 * A certain other OS sets these coeffs to different values. On at least
> +	 * one TongFang barebone these settings might survive even a cold
> +	 * reboot. So to restore a clean slate the values are explicitly reset
> +	 * to default here. Without this, the external microphone is always in a
> +	 * plugged-in state, while the internal microphone is always in an
> +	 * unplugged state, breaking the ability to use the internal microphone.
> +	 */
> +	alc_process_coef_fw(codec, alc256_fixup_tongfang_reset_persistent_settings_coefs);
>  }
>  
>  static const struct coef_fw alc233_fixup_no_audio_jack_coefs[] = {