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: <3e50185b-d674-4890-8173-7bdd54c4eafb@opensource.cirrus.com>
Date:   Thu, 4 Mar 2021 18:36:35 +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>
Subject: Re: [PATCH 2/4] ALSA: hda/cirrus: Add support for CS8409 HDA bridge
 and CS42L42 companion codec.

On 04/03/2021 1:39 pm, Takashi Iwai wrote:
Thank you very much for quick response!
> 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.
Yes, This should be removed
>
>> +	{ 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.
Will handle via spec 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...
This was added in the next patch, but you are right we should handle it 
here.
>
>> +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).
Yes, needs to be fixed. I will make v2 patch set.
>
>
> thanks,
>
> Takashi