linux-kernel - Re: [PATCH 2/4] ALSA: hda/cirrus: Add support for CS8409 HDA bridge and CS42L42 companion codec.

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Message-ID: <s5h8s739gxf.wl-tiwai@suse.de>
Date:   Thu, 04 Mar 2021 14:39:24 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
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>
Subject: Re: [PATCH 2/4] ALSA: hda/cirrus: Add support for CS8409 HDA bridge and CS42L42 companion codec.

On Wed, 03 Mar 2021 19:29:57 +0100,
Vitaly Rodionov wrote:
> 
> +static const struct hda_verb cs8409_cs42l42_init_verbs[] = {
> +	{ 0x01, AC_VERB_SET_POWER_STATE, 0x0000 },    /* AFG: D0 */

I guess this power state change is superfluous.  The AFG node is
already powered up when the codec probe or init is called.

> +	{ 0x01, AC_VERB_SET_GPIO_DIRECTION, 0x0020 }, /* GPIO 5 out, 3,4 in */
> +	{ 0x01, AC_VERB_SET_GPIO_DATA, 0x0000 },      /* GPIO  data 0 */
> +	{ 0x01, AC_VERB_SET_GPIO_MASK, 0x003f },      /* Enable GPIO */

Those are handled in spec->gpio_dir, gpio->data and gpio->mask
fields.

> +	{ 0x01, AC_VERB_SET_GPIO_WAKE_MASK, 0x0018 }, /* WAKE from GPIO 3,4 */
> +	{ 0x47, AC_VERB_SET_PROC_STATE, 0x0001 },     /* Enable VPW processing  */
> +	{ 0x47, AC_VERB_SET_COEF_INDEX, 0x0002 },     /* Configure GPIO 6,7 */
> +	{ 0x47, AC_VERB_SET_PROC_COEF,  0x0080 },     /* I2C mode */
> +	{ 0x47, AC_VERB_SET_COEF_INDEX, 0x005b },     /* Set I2C bus speed */
> +	{ 0x47, AC_VERB_SET_PROC_COEF,  0x0200 },     /* 100kHz I2C_STO = 2 */

Those remaining verbs are good in the init verbs.  But I suppose they
have to be applied at the resume as well?  But...

> +static int cs8409_cs42l42_fixup(struct hda_codec *codec)
> +{
> +	int err = 0;
> +	struct cs_spec *spec = codec->spec;
> +	unsigned int pincap = 0;
> +
> +	/* Basic initial sequence for specific hw configuration */
> +	snd_hda_sequence_write(codec, cs8409_cs42l42_init_verbs);

... it seems applied only at the fixup call at parsing?

Ditto about cs8409_cs42l42_hw_init(codec).


thanks,

Takashi