linux-kernel - Re: [PATCH] clk: amlogic: axg-audio: select RESET_MESON

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Message-ID: <1ja5dk2y5l.fsf@starbuckisacylon.baylibre.com>
Date: Wed, 27 Nov 2024 21:56:54 +0100
From: Jerome Brunet <jbrunet@...libre.com>
To: "Arnd Bergmann" <arnd@...db.de>
Cc: "Neil Armstrong" <neil.armstrong@...aro.org>,  "Michael Turquette"
 <mturquette@...libre.com>,  "Stephen Boyd" <sboyd@...nel.org>,  "Kevin
 Hilman" <khilman@...libre.com>,  "Martin Blumenstingl"
 <martin.blumenstingl@...glemail.com>,  linux-amlogic@...ts.infradead.org,
  linux-clk@...r.kernel.org,  linux-arm-kernel@...ts.infradead.org,
  linux-kernel@...r.kernel.org,  "Mark Brown" <broonie@...nel.org>
Subject: Re: [PATCH] clk: amlogic: axg-audio: select RESET_MESON_AUX

On Wed 27 Nov 2024 at 20:30, "Arnd Bergmann" <arnd@...db.de> wrote:

> On Wed, Nov 27, 2024, at 19:47, Jerome Brunet wrote:
>> Depending on RESET_MESON_AUX result in axg-audio support being turned
>> off by default for the users of arm64 defconfig, which is kind of a
>> regression for them.
>>
>> RESET_MESON_AUX is not in directly the defconfig, so depending on it turn
>> COMMON_CLK_AXG_AUDIO off. The clock provided by this module are
>> necessary for every axg audio devices. Those are now deferring.
>>
>> Select RESET_MESON_AUX rather than just depending on it.
>> With this, the audio subsystem of the affected platform should probe
>> correctly again
>>
>> Cc: Mark Brown <broonie@...nel.org>
>> Fixes: 681ed497d676 ("clk: amlogic: axg-audio: fix Kconfig dependency 
>> on RESET_MESON_AUX")
>> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
>
>
> febb5d7348ff07c2da0cb5fd41d2ad2607e5bd5d..ea16bfde0df2d7bfebb041161f6b96bbb35003ed 
>> 100644
>> --- a/drivers/clk/meson/Kconfig
>> +++ b/drivers/clk/meson/Kconfig
>> @@ -106,7 +106,7 @@ config COMMON_CLK_AXG_AUDIO
>>  	select COMMON_CLK_MESON_SCLK_DIV
>>  	select COMMON_CLK_MESON_CLKC_UTILS
>>  	select REGMAP_MMIO
>> -	depends on RESET_MESON_AUX
>> +	select RESET_MESON_AUX
>>  	help
>>  	  Support for the audio clock controller on AmLogic A113D devices,
>>  	  aka axg, Say Y if you want audio subsystem to work.
>
> You should generally not 'select' a symbol from another
> subsystem, as this risks introducing dependency loops,
> and missing dependencies.

I do understand that one needs to be careful with that sort of things
but I don't think this is happening here.

>
> It looks like RESET_MESON_AUX is a user-visible symbol,
> so you can simply ask users to turn it on, and add it to
> the defconfig.

That would work yes but It's really something a user should not be
concerned with. I can follow-up with another change to remove the user
visibilty of RESET_MESON_AUX. It is always going to be something
requested by another driver.

>
> I also see some silliness going on in the
> include/soc/amlogic/reset-meson-aux.h, which has a
> non-working 'static inline' definition of the exported
> function. Before my fix, that would have caused the
> problem auf a non-working audio driver.

If by 'silliness' you mean there is symbol definition for when
RESET_MESON_AUX is disabled, indeed I guess that could go away.

Thanks for pointing it out.

>
>       Arnd

-- 
Jerome