linux-kernel - Re: [PATCH 4/4] ALSA: hda/cirrus: Add Headphone and Headset MIC Volume Control

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Date:   Thu, 4 Mar 2021 18:45:13 +0000
From:   Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
To:     Takashi Iwai <tiwai@...e.de>
CC:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        <alsa-devel@...a-project.org>, <patches@...nsource.cirrus.com>,
        <linux-kernel@...r.kernel.org>,
        Stefan Binding <sbinding@...nsource.cirrus.com>
Subject: Re: [PATCH 4/4] ALSA: hda/cirrus: Add Headphone and Headset MIC
 Volume Control

On 04/03/2021 1:49 pm, Takashi Iwai wrote:
> On Wed, 03 Mar 2021 19:29:59 +0100,
> Vitaly Rodionov wrote:
>> +static int cs8409_cs42l42_volume_get(struct snd_kcontrol *kcontrol,
>> +				 struct snd_ctl_elem_value *ucontrol)
>> +{
>> +	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
>> +	hda_nid_t nid = get_amp_nid(kcontrol);
>> +	int chs = get_amp_channels(kcontrol);
>> +	long *valp = ucontrol->value.integer.value;
>> +	char vol = 0;
>> +
>> +	codec_dbg(codec, "%s() nid: %d\n", __func__, nid);
>> +	snd_hda_power_up(codec);
>> +	switch (nid) {
>> +	case CS8409_CS42L42_HP_PIN_NID:
>> +		mutex_lock(&cs8409_i2c_mux);
>> +		if (chs & 1) {
>> +			vol = -(cs8409_i2c_read(codec, CS42L42_I2C_ADDR,
>> +				CS8409_CS42L42_REG_HS_VOLUME_CHA, 1));
> Better to cache the values instead of i2c read at each time?
> Then the unnecessary power up/down sequence can be avoided, too.
Yes, agree. Will be fixed in next version of patch.
>
>
> thanks,
>
> Takashi

Thank you,

Vitaly