[RFC PATCH 6/6] ALSA: hda: add fallback capabilities for SKL+ platforms

[Pierre-Louis Bossart]

Enable fallback for select PCI IDs

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
 sound/pci/hda/Kconfig     | 40 +++++++++++++++++++++++++++++++++++++++
 sound/pci/hda/hda_intel.c | 19 +++++++++++++------
 sound/soc/intel/Kconfig   |  6 ++++++
 3 files changed, 59 insertions(+), 6 deletions(-)

diff --git a/sound/pci/hda/Kconfig b/sound/pci/hda/Kconfig
index 4235907b7858..9bb317fb3507 100644
--- a/sound/pci/hda/Kconfig
+++ b/sound/pci/hda/Kconfig
@@ -228,4 +228,44 @@ config SND_HDA_POWER_SAVE_DEFAULT
 
 endif
 
+if SND_HDA_INTEL
+
+config SND_HDA_INTEL_LEGACY_FALLBACK_SKL
+	bool
+	help
+	  This option enables HD-audio legacy fallback for
+	  Skylake machines
+
+config SND_HDA_INTEL_LEGACY_FALLBACK_APL
+	bool
+	help
+	  This option enables HD-audio legacy fallback for
+	  Broxton/ApolloLake machines
+
+config SND_HDA_INTEL_LEGACY_FALLBACK_KBL
+	bool
+	help
+	  This option enables HD-audio legacy fallback for
+	  KabyLake machines
+
+config SND_HDA_INTEL_LEGACY_FALLBACK_GLK
+	bool
+	help
+	  This option enables HD-audio legacy fallback for
+	  GeminiLake machines
+
+config SND_HDA_INTEL_LEGACY_FALLBACK_CNL
+	bool
+	help
+	  This option enables HD-audio legacy fallback for
+	  CannonLake machines
+
+config SND_HDA_INTEL_LEGACY_FALLBACK_CFL
+	bool
+	help
+	  This option enables HD-audio legacy fallback for
+	  CoffeeLake machines
+
+endif ## SND_HDA_INTEL
+
 endmenu
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index eb00e37c1c27..569419242da3 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -360,6 +360,7 @@ enum {
 	 AZX_DCAPS_NO_64BIT |\
 	 AZX_DCAPS_4K_BDLE_BOUNDARY | AZX_DCAPS_SNOOP_OFF)
 
+#define AZX_DCAPS_INTEL_LEGACY_FALLBACK(conf) (IS_ENABLED(conf) ? AZX_DCAPS_INTEL_SHARED : 0)
 /*
  * vga_switcheroo support
  */
@@ -2416,34 +2417,40 @@ static const struct pci_device_id azx_ids[] = {
 	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE },
 	/* Sunrise Point-LP */
 	{ PCI_DEVICE(0x8086, 0x9d70),
-	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE },
+	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE |
+	  AZX_DCAPS_INTEL_LEGACY_FALLBACK(CONFIG_SND_HDA_INTEL_LEGACY_FALLBACK_SKL) },
 	/* Kabylake */
 	{ PCI_DEVICE(0x8086, 0xa171),
 	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE },
 	/* Kabylake-LP */
 	{ PCI_DEVICE(0x8086, 0x9d71),
-	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE },
+	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE |
+	  AZX_DCAPS_INTEL_LEGACY_FALLBACK(CONFIG_SND_HDA_INTEL_LEGACY_FALLBACK_KBL) },
 	/* Kabylake-H */
 	{ PCI_DEVICE(0x8086, 0xa2f0),
 	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE },
 	/* Coffelake */
 	{ PCI_DEVICE(0x8086, 0xa348),
-	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE},
+	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE |
+	  AZX_DCAPS_INTEL_LEGACY_FALLBACK(CONFIG_SND_HDA_INTEL_LEGACY_FALLBACK_CFL) },
 	/* Cannonlake */
 	{ PCI_DEVICE(0x8086, 0x9dc8),
-	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE},
+	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE |
+	  AZX_DCAPS_INTEL_LEGACY_FALLBACK(CONFIG_SND_HDA_INTEL_LEGACY_FALLBACK_CNL) },
 	/* Icelake */
 	{ PCI_DEVICE(0x8086, 0x34c8),
 	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE},
 	/* Broxton-P(Apollolake) */
 	{ PCI_DEVICE(0x8086, 0x5a98),
-	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_BROXTON },
+	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_BROXTON |
+	  AZX_DCAPS_INTEL_LEGACY_FALLBACK(CONFIG_SND_HDA_INTEL_LEGACY_FALLBACK_APL) },
 	/* Broxton-T */
 	{ PCI_DEVICE(0x8086, 0x1a98),
 	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_BROXTON },
 	/* Gemini-Lake */
 	{ PCI_DEVICE(0x8086, 0x3198),
-	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_BROXTON },
+	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_BROXTON |
+	  AZX_DCAPS_INTEL_LEGACY_FALLBACK(CONFIG_SND_HDA_INTEL_LEGACY_FALLBACK_GLK) },
 	/* Haswell */
 	{ PCI_DEVICE(0x8086, 0x0a0c),
 	  .driver_data = AZX_DRIVER_HDMI | AZX_DCAPS_INTEL_HASWELL },
diff --git a/sound/soc/intel/Kconfig b/sound/soc/intel/Kconfig
index c02d08d31d0d..4c6abdbb0b90 100644
--- a/sound/soc/intel/Kconfig
+++ b/sound/soc/intel/Kconfig
@@ -197,6 +197,12 @@ config SND_SOC_INTEL_SKYLAKE_COMMON
 config SND_SOC_INTEL_SKL_LEGACY_SUPPORT
 	bool "Fallback legacy HD-audio binding"
 	depends on SND_HDA_INTEL=y || SND_SOC_INTEL_SKYLAKE_FAMILY=SND_HDA_INTEL
+	select SND_HDA_INTEL_LEGACY_FALLBACK_SKL if SND_SOC_INTEL_SKL
+	select SND_HDA_INTEL_LEGACY_FALLBACK_APL if SND_SOC_INTEL_APL
+	select SND_HDA_INTEL_LEGACY_FALLBACK_KBL if SND_SOC_INTEL_KBL
+	select SND_HDA_INTEL_LEGACY_FALLBACK_GLK if SND_SOC_INTEL_GLK
+	select SND_HDA_INTEL_LEGACY_FALLBACK_CNL if SND_SOC_INTEL_CNL
+	select SND_HDA_INTEL_LEGACY_FALLBACK_CFL if SND_SOC_INTEL_CFL
 	help
 	  Fallback binding with the legacy HD-audio driver when no DSP is
 	  found
-- 
2.17.1