Re: [PATCH] ASoC: SOF: amd: fix soundwire dependencies

From: "Mukunda,Vijendar" <vijendar.mukunda@amd.com>
To: Arnd Bergmann <arnd@kernel.org>,
	Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Peter Ujfalusi <peter.ujfalusi@linux.intel.com>,
	Bard Liao <yung-chuan.liao@linux.intel.com>,
	Ranjani Sridharan <ranjani.sridharan@linux.intel.com>,
	Daniel Baluta <daniel.baluta@nxp.com>,
	Mark Brown <broonie@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Kai Vehmanen <kai.vehmanen@linux.intel.com>,
	Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
	V sujith kumar Reddy <Vsujithkumar.Reddy@amd.com>,
	Venkata Prasad Potturu <venkataprasad.potturu@amd.com>,
	sound-open-firmware@alsa-project.org,
	linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ASoC: SOF: amd: fix soundwire dependencies
Date: Tue, 20 Feb 2024 15:49:32 +0530	[thread overview]
Message-ID: <e16dc980-fd69-4b5b-9c68-6107dd2f3145@amd.com> (raw)
In-Reply-To: <20240219093900.644574-1-arnd@kernel.org>

On 19/02/24 15:08, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> The soundwire-amd driver has a bit of a layering violation requiring
> the SOF driver to directly call into its exported symbols rather than
> through an abstraction.
>
> The SND_SOC_SOF_AMD_SOUNDWIRE Kconfig symbol tries to deal with the
> dependency by selecting SOUNDWIRE_AMD in a complicated set of conditions,
> but gets it wrong for a configuration involving SND_SOC_SOF_AMD_COMMON=y,
> SND_SOC_SOF_AMD_ACP63=m, and SND_SOC_SOF_AMD_SOUNDWIRE_LINK_BASELINE=m
> SOUNDWIRE_AMD=m, which results in a link failure:
>
> ld.lld: error: undefined symbol: sdw_amd_get_slave_info
>>>> referenced by acp-common.c
> ld.lld: error: undefined symbol: amd_sdw_scan_controller
> ld.lld: error: undefined symbol: sdw_amd_probe
> ld.lld: error: undefined symbol: sdw_amd_exit
>>>> referenced by acp.c
>>>>               sound/soc/sof/amd/acp.o:(amd_sof_acp_remove) in archive vmlinux.a
> In essence, the SND_SOC_SOF_AMD_COMMON option cannot be built-in when
> trying to link against a modular SOUNDWIRE_AMD driver.
>
> Since CONFIG_SOUNDWIRE_AMD is a user-visible option, it really should
> never be selected by another driver in the first place, so replace the
> extra complexity with a normal Kconfig dependency in SND_SOC_SOF_AMD_SOUNDWIRE,
> plus a top-level check that forbids any of the AMD SOF drivers from being
> built-in with CONFIG_SOUNDWIRE_AMD=m.
>
> In normal configs, they should all either be built-in or all loadable
> modules anyway, so this simplification does not limit any real usecases.
Tested-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
>
> Fixes: d948218424bf ("ASoC: SOF: amd: add code for invoking soundwire manager helper functions")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  sound/soc/sof/amd/Kconfig | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/sound/soc/sof/amd/Kconfig b/sound/soc/sof/amd/Kconfig
> index c3bbe6c70fb2..2729c6eb3feb 100644
> --- a/sound/soc/sof/amd/Kconfig
> +++ b/sound/soc/sof/amd/Kconfig
> @@ -6,6 +6,7 @@
>  
>  config SND_SOC_SOF_AMD_TOPLEVEL
>  	tristate "SOF support for AMD audio DSPs"
> +	depends on SOUNDWIRE_AMD || !SOUNDWIRE_AMD
>  	depends on X86 || COMPILE_TEST
>  	help
>  	  This adds support for Sound Open Firmware for AMD platforms.
> @@ -62,15 +63,14 @@ config SND_SOC_SOF_ACP_PROBES
>  
>  config SND_SOC_SOF_AMD_SOUNDWIRE_LINK_BASELINE
>  	tristate
> -	select SOUNDWIRE_AMD if SND_SOC_SOF_AMD_SOUNDWIRE != n
>  	select SND_AMD_SOUNDWIRE_ACPI if ACPI
>  
>  config SND_SOC_SOF_AMD_SOUNDWIRE
>  	tristate "SOF support for SoundWire based AMD platforms"
>  	default SND_SOC_SOF_AMD_SOUNDWIRE_LINK_BASELINE
>  	depends on SND_SOC_SOF_AMD_SOUNDWIRE_LINK_BASELINE
> -	depends on ACPI && SOUNDWIRE
> -	depends on !(SOUNDWIRE=m && SND_SOC_SOF_AMD_SOUNDWIRE_LINK_BASELINE=y)
> +	depends on ACPI
> +	depends on SOUNDWIRE_AMD
>  	help
>  	  This adds support for SoundWire with Sound Open Firmware
>  	  for AMD platforms.