linux-kernel - Re: [PATCH] ASoC: rt5677: Reintroduce I2C device IDs

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Message-ID: <20170825193323.GO2827@bill-the-cat>
Date:   Fri, 25 Aug 2017 15:33:23 -0400
From:   Tom Rini <trini@...sulko.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     John Keeping <john@...anate.com>, linux-kernel@...r.kernel.org,
        Bard Liao <bardliao@...ltek.com>,
        Oder Chiou <oder_chiou@...ltek.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        Mark Brown <broonie@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] ASoC: rt5677: Reintroduce I2C device IDs

On Fri, Aug 25, 2017 at 07:42:51PM +0300, Andy Shevchenko wrote:
> On Fri, 2017-08-25 at 17:05 +0100, John Keeping wrote:
> > On Fri, 25 Aug 2017 10:24:26 -0400, Tom Rini wrote:
> > > On Fri, Aug 25, 2017 at 04:56:47PM +0300, Andy Shevchenko wrote:
> 
> > > > Apparently you are the one who tested the commit
> > > > 	89128534f925 ("ASoC: rt5677: Add ACPI support")
> > > > year ago.  
> > > 
> > > Yes.
> > > 
> > > > The commit states that ACPI properties that are used in Chromebook
> > > > Pixel
> > > > 2015 is non-standard (not the same as for DT).
> > > > 
> > > > However, DSDT shows the opposite!  
> > > 
> > > Interesting.  I'm not an ACPI person, I just tested what John came
> > > up
> > > with.
> > 
> > And the patch adding this was the first (and still only) time I've
> > really looked at ACPI, so it's quite possible that I misunderstood
> > something at the time.
> 
> Maybe.
> 
> > From memory, I think the particular problem I was referring to in the
> > commit message was that certain GPIOs were only defined by index and
> > not
> > by property name (specifically "plug-det-gpios", "mic-present-gpios"
> > and
> > "headphone-enable-gpios"), and having dumped DSDT just now I do not
> > see
> > those strings appearing anywhere.
> 
> Exactly, and this part of the patch I'm _not_ talking about (it's pretty
> much good and working).
> 
> What I'm talking about is a specific function called
> 
> rt5677_read_acpi_properties()
> 
> in the rt5677.c codec driver.
> 
> The question is do we have _real publicly available_ hardware with that
> kind of properties?
> 
> Because now it's a mess (wrt to real DSDT attached to the thread).
> 
> The proposed change to fix this is like
> 
> diff --git a/sound/soc/codecs/rt5677.c b/sound/soc/codecs/rt5677.c
> index 6448b7a00203..28bde5f50ed9 100644
> --- a/sound/soc/codecs/rt5677.c
> +++ b/sound/soc/codecs/rt5677.c
> @@ -5145,20 +5145,18 @@ static int rt5677_i2c_probe(struct i2c_client
> *i2c)
>  		match_id = of_match_device(rt5677_of_match, &i2c->dev);
>  		if (match_id)
>  			rt5677->type = (enum rt5677_type)match_id-
> >data;
> -
> -		rt5677_read_device_properties(rt5677, &i2c->dev);
>  	} else if (ACPI_HANDLE(&i2c->dev)) {
>  		const struct acpi_device_id *acpi_id;
>  
>  		acpi_id = acpi_match_device(rt5677_acpi_match, &i2c-
> >dev);
>  		if (acpi_id)
>  			rt5677->type = (enum rt5677_type)acpi_id-
> >driver_data;
> -
> -		rt5677_read_acpi_properties(rt5677, &i2c->dev);
>  	} else {
>  		return -EINVAL;
>  	}
>  
> +	rt5677_read_device_properties(rt5677, &i2c->dev);
> +
>  	/* pow-ldo2 and reset are optional. The codec pins may be
> statically
>  	 * connected on the board without gpios. If the gpio device
> property
>  	 * isn't specified, devm_gpiod_get_optional returns NULL.
> 
> + removing rt5677_read_acpi_properties() completely.
> 
> Tom, if you can test it (basic test + might be quality of sound) on your
> Chromebook, it would be nice!

OK.  I did the above manually (on top of the correct fix for the problem
I originally reported from asoc-next), also removed
rt5677_read_acpi_properties and gave the various THX/Dolby sound tests a
spin and they sound good.

As an unrelated request for help, the headphone jack isn't automatically
detected and used, but I assume this is a user configuration issue.
This is unchanged with your patch :)

-- 
Tom

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