linux-kernel - Re: [PATCH v9 3/4] ASoC: tda998x: add a codec to the HDMI transmitter

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Message-ID: <54AFAC4C.7010209@ti.com>
Date:	Fri, 9 Jan 2015 12:24:12 +0200
From:	Jyri Sarha <jsarha@...com>
To:	Jean-Francois Moine <moinejf@...e.fr>,
	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Andrew Jackson <Andrew.Jackson@....com>,
	Mark Brown <broonie@...nel.org>,
	Dave Airlie <airlied@...il.com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 3/4] ASoC: tda998x: add a codec to the HDMI transmitter

On 01/07/2015 08:02 PM, Jean-Francois Moine wrote:
> On Wed, 7 Jan 2015 15:41:38 +0000
> Russell King - ARM Linux <linux@....linux.org.uk> wrote:
>
>> On Wed, Jan 07, 2015 at 03:10:47PM +0000, Andrew Jackson wrote:
>>> On 01/07/15 10:51, Jean-Francois Moine wrote:
>>>> diff --git a/drivers/gpu/drm/i2c/Kconfig b/drivers/gpu/drm/i2c/Kconfig
>>>> index 22c7ed6..24fc975 100644
>>>> --- a/drivers/gpu/drm/i2c/Kconfig
>>>> +++ b/drivers/gpu/drm/i2c/Kconfig
>>>> @@ -28,6 +28,7 @@ config DRM_I2C_SIL164
>>>>   config DRM_I2C_NXP_TDA998X
>>>>          tristate "NXP Semiconductors TDA998X HDMI encoder"
>>>>          default m if DRM_TILCDC
>>>> +       select SND_SOC_TDA998X
>>>
>>> Do you need this since sound/soc/codecs/Kconfig conditionally brings in the
>>> CODEC driver?
>
> For SND_SOC_ALL_CODECS only.
>
>> More importantly, it's broken, because it'll cause Kconfig to complain
>> if you enable DRM_I2C_NXP_TDA998X, but have ASoC disabled.
>>
>> Moreover, if you decide you want the sound and ASoC built as a module,
>> but want to build in DRM and TDA998x support (so you can get video
>> output working on boot before initramfs/rootfs), Kconfig may well
>> complain.
>
> 	select SND_SOC_TDA998X if SND_SOC
>
> should work in all cases.
>

I think that would still fail if DRM and TDA998x is built in and SND_SOC 
is built as modules. A request_module() call before 
tda9998x_codec_register() should help. Or could could write:

select SND_SOC_TDA998X if (SND_SOC=DRM_I2C_NXP_TDA998X || SND_SOC=y)

>>>> +static int __init tda998x_codec_init(void)
>>>> +{
>>>> +       return 0;
>>>> +}
>>>> +static void __exit tda998x_codec_exit(void)
>>>> +{
>>>> +}
>>>> +module_init(tda998x_codec_init);
>>>> +module_exit(tda998x_codec_exit);
>>
>> There's no need for these if they remain as the above.  Modules can have
>> both init/exit functions, or neither, and they are still unloadable.
>> Only modules which provide only an init function get locked in on load.
>
> Thanks.
>

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