linux-kernel - Re: PM regression in next

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Message-ID: <e168493c-c1db-07e5-a33b-faa447e22f4a@ti.com>
Date:   Wed, 17 Jan 2018 11:47:19 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Tony Lindgren <tony@...mide.com>, Mark Brown <broonie@...nel.org>
CC:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-omap@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        <linux-pm@...r.kernel.org>
Subject: Re: PM regression in next

Hi,

On 2018-01-15 20:55, Tony Lindgren wrote:
> * Mark Brown <broonie@...nel.org> [180115 18:14]:
>> On Mon, Jan 15, 2018 at 10:06:26AM -0800, Tony Lindgren wrote:
>>> * Mark Brown <broonie@...nel.org> [180115 17:56]:
>>
>>>> Sorry, I didn't actually post it - just suggested adding the
>>>> snd_soc_codec_set_regmap() call.
>>
>>> Oh I see. Yeah that seems like a good long term solution after
>>> the regressions are fixed.
>>
>> I would like to see us do that sooner rather than later assuming it
>> addresses the issue, it's quicker and simpler.
> 
> Peter, can you take a look at that?

Sorry I have missed the thread...

> 
> Meanwhile, here's a regression fix for Linux next for twl4030
> and 6040 drivers.

The .read and the .write in snd_soc_codec_driver is needed. Without it
DAPM can not read/write to registers when we have codec driver which
does not have regmap. twl4030/6040 is an MFD device and the regmap is
owned by the mfd driver, the codec, vibra, gpio, clk, etc sub devices
are using callbacks to do IO.

I will look at the local caching, but afaik it was needed and can not be
done in regmap or mfd level.

I will also take a look at the dac33 driver to see if it is broken, but
I don't have Nokia n9/n950 where I could test it.

Acked-by: Peter Ujfalusi <peter.ujfalusi@...com>

> 
> Regards,
> 
> Tony
> 
> 8< ---------------------
> From tony Mon Sep 17 00:00:00 2001
> From: Tony Lindgren <tony@...mide.com>
> Date: Fri, 12 Jan 2018 10:24:36 -0800
> Subject: [PATCH] ASoC: Fix twl4030 and 6040 regression by adding back read
>  and write
> 
> Commit 3bb0f7c31b1a ("ASoC: don't use snd_soc_write/read on twl4030")
> caused regressions for both twl4030 and twl6040 as it assumes the
> ASoC driver is using regmap. As a side effect, this also causes a
> considerable increase in idle power consumption omap3 boards using
> twl4030 as the PMIC.
> 
> This is because the removal of read and write function pointers
> causes some of the ASoC IO functions to not do anything. For example,
> snd_soc_register_card() calls snd_soc_dapm_new_widgets() that calls
> snd_soc_codec_drv_read() that now does nothing.
> 
> A long term solution suggested by Mark Brown <broonie@...nel.org>
> is to make the twl drivers use regmap by adding a call to
> snd_soc_codec_set_regmap(). This however needs more consideration
> as currently the driver internal reads do caching and we would have
> both regmap access and internal read/write access accessing the same
> hardware registers.
> 
> So to fix the regression, let's just do a partial revert adding back
> the read and write function pointers. Note that other non-regmap
> ASoC drivers may need similar patches.
> 
> Fixes: 3bb0f7c31b1a ("ASoC: don't use snd_soc_write/read on twl4030")
> Fixes: 93a00c467fe9 ("ASoC: don't use snd_soc_write/read on twl6040")
> Cc: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
> Cc: Peter Ujfalusi <peter.ujfalusi@...com>
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
>  sound/soc/codecs/twl4030.c | 2 ++
>  sound/soc/codecs/twl6040.c | 2 ++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
> --- a/sound/soc/codecs/twl4030.c
> +++ b/sound/soc/codecs/twl4030.c
> @@ -2195,6 +2195,8 @@ static int twl4030_soc_remove(struct snd_soc_codec *codec)
>  static const struct snd_soc_codec_driver soc_codec_dev_twl4030 = {
>  	.probe = twl4030_soc_probe,
>  	.remove = twl4030_soc_remove,
> +	.read = twl4030_read,
> +	.write = twl4030_write,
>  	.set_bias_level = twl4030_set_bias_level,
>  	.idle_bias_off = true,
>  
> diff --git a/sound/soc/codecs/twl6040.c b/sound/soc/codecs/twl6040.c
> --- a/sound/soc/codecs/twl6040.c
> +++ b/sound/soc/codecs/twl6040.c
> @@ -1158,6 +1158,8 @@ static int twl6040_remove(struct snd_soc_codec *codec)
>  static const struct snd_soc_codec_driver soc_codec_dev_twl6040 = {
>  	.probe = twl6040_probe,
>  	.remove = twl6040_remove,
> +	.read = twl6040_read,
> +	.write = twl6040_write,
>  	.set_bias_level = twl6040_set_bias_level,
>  	.suspend_bias_off = true,
>  	.ignore_pmdown_time = true,
> 

- Péter

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