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Date:   Tue, 12 Jan 2021 21:32:18 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Mark Brown <broonie@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        sound-open-firmware@...a-project.org
Subject: [PATCH 2/2] ASoC: intel: fix soundwire dependencies

From: Arnd Bergmann <arnd@...db.de>

The Kconfig logic around SND_SOC_SOF_INTEL_SOUNDWIRE tries to
ensure that all sound modules can be built with the minimal
dependencies, but this fails in some configurations:

x86_64-linux-ld: sound/hda/intel-dsp-config.o: in function `snd_intel_dsp_driver_probe':
intel-dsp-config.c:(.text+0x134): undefined reference to `sdw_intel_acpi_scan'

Specifically, this happens if the dsp-config driver is built-in but does
not need to use soundwire, while CONFIG_SOUNDWIRE_INTEL is enabled as
a loadable module.

An easier and more correct way to do this is to remove
CONFIG_SND_SOC_SOF_INTEL_SOUNDWIRE_LINK and instead have
the two drivers that can link against SOUNDWIRE_INTEL,
i.e. DSP_CONFIG and SND_SOC_SOF_HDA, select that driver whenever
SND_SOC_SOF_INTEL_SOUNDWIRE_LINK is set.

This however means that SND_SOC_SOF_INTEL_SOUNDWIRE cannot be selected
by users when SOUNDWIRE is only usable by loadable modules and one or
more drivers using SND_SOC_SOF_INTEL_SOUNDWIRE_LINK_BASELINE is built-in.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 sound/hda/Kconfig           |  1 +
 sound/soc/sof/intel/Kconfig | 16 ++++++----------
 2 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/sound/hda/Kconfig b/sound/hda/Kconfig
index 3bc9224d5e4f..ecab814d7698 100644
--- a/sound/hda/Kconfig
+++ b/sound/hda/Kconfig
@@ -44,5 +44,6 @@ config SND_INTEL_NHLT
 config SND_INTEL_DSP_CONFIG
 	tristate
 	select SND_INTEL_NHLT if ACPI
+	select SOUNDWIRE_INTEL if SND_SOC_SOF_INTEL_SOUNDWIRE
 	# this config should be selected only for Intel DSP platforms.
 	# A fallback is provided so that the code compiles in all cases.
diff --git a/sound/soc/sof/intel/Kconfig b/sound/soc/sof/intel/Kconfig
index 67365ce0d86d..df8f9760870e 100644
--- a/sound/soc/sof/intel/Kconfig
+++ b/sound/soc/sof/intel/Kconfig
@@ -330,13 +330,17 @@ config SND_SOC_SOF_HDA
 	tristate
 	select SND_HDA_EXT_CORE if SND_SOC_SOF_HDA_LINK
 	select SND_SOC_HDAC_HDA if SND_SOC_SOF_HDA_AUDIO_CODEC
+	select SOUNDWIRE_INTEL if SND_SOC_SOF_INTEL_SOUNDWIRE
 	help
 	  This option is not user-selectable but automagically handled by
 	  'select' statements at a higher level.
 
-config SND_SOC_SOF_INTEL_SOUNDWIRE_LINK
+config SND_SOC_SOF_INTEL_SOUNDWIRE
 	bool "SOF support for SoundWire"
-	depends on SOUNDWIRE && ACPI
+	depends on SND_SOC_SOF_INTEL_SOUNDWIRE_LINK_BASELINE
+	depends on SOUNDWIRE
+	depends on ACPI
+	depends on !(SOUNDWIRE=m && SND_SOC_SOF_INTEL_SOUNDWIRE_LINK_BASELINE=y)
 	help
 	  This adds support for SoundWire with Sound Open Firmware
 	  for Intel(R) platforms.
@@ -345,14 +349,6 @@ config SND_SOC_SOF_INTEL_SOUNDWIRE_LINK
 
 config SND_SOC_SOF_INTEL_SOUNDWIRE_LINK_BASELINE
 	tristate
-	select SND_SOC_SOF_INTEL_SOUNDWIRE if SND_SOC_SOF_INTEL_SOUNDWIRE_LINK
-	help
-	  This option is not user-selectable but automagically handled by
-	  'select' statements at a higher level.
-
-config SND_SOC_SOF_INTEL_SOUNDWIRE
-	tristate
-	select SOUNDWIRE_INTEL
 	help
 	  This option is not user-selectable but automagically handled by
 	  'select' statements at a higher level.
-- 
2.29.2

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