linux-kernel - Re: [PATCH 10/10] ASoC: Intel: soc-acpi: Add CS35L56 Soundwire to TGL

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Date:   Wed, 22 Feb 2023 09:31:52 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>, broonie@...nel.org,
        cezary.rojewski@...el.com, peter.ujfalusi@...ux.intel.com,
        yung-chuan.liao@...ux.intel.com, kai.vehmanen@...ux.intel.com
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        patches@...nsource.cirrus.com
Subject: Re: [PATCH 10/10] ASoC: Intel: soc-acpi: Add CS35L56 Soundwire to TGL



On 2/22/23 06:48, Richard Fitzgerald wrote:
> On 21/02/2023 16:52, Pierre-Louis Bossart wrote:
>>
>>> +static const struct snd_soc_acpi_link_adr
>>> up_extreme_cs35l56_sdw0_one[] = {
>>> +    {
>>> +        .mask = BIT(0),
>>> +        .num_adr = 1,
>>> +        .adr_d = cs35l56_sdw0_adr,
>>> +    },
>>> +    {}
>>> +};
>>> +
>>> +static const struct snd_soc_acpi_link_adr
>>> up_extreme_cs35l56_sdw0_four[] = {
>>> +    {
>>> +        .mask = BIT(0),
>>> +        .num_adr = 4,
>>> +        .adr_d = cs35l56_sdw0_adr,
>>> +    },
>>> +    {}
>>> +};
>>
>> If the machine driver has support for the 2-amplifier configuration,
>> shouldn't it be present here as well?
>>
> 
> Not necessarily.
> It's not a setup we're currently using on this initial TGL
> configuration.
> 
> The machine driver we'd expect to work on multiple hardware. The
> counting algorithm has to go through "2" anyway, and the code to
> handle that is so trivial we may as well include it.

it's fine. usually we are more conservative and have a 1:1 match between
the soc-acpi tables and machine driver, but it doesn't hurt to add the
2-amp case in the machine driver.