The kernel has 2 drivers for the Low Power Engine audio-block on Bay- and Cherry-Trail SoCs. The old SST driver and the new SOF driver. If both drivers are enabled then the kernel will default to using the old SST driver, unless told otherwise through the snd_intel_dspcfg.dsp_driver module-parameter.

Add a boolean SND_INTEL_BYT_PREFER_SOF Kconfig option, which when set to Y will make the kernel default to the new SOF driver instead. The option defaults to n, preserving the current behavior.

Making this configurable will help distributions such as Fedora: https://fedoraproject.org/w/index.php?title=Changes/SofDefaultForIntelLpe to test using SOF on BYT/CHT during the transition phase where we have both drivers (eventually the old driver and this option will be removed).

Note that this drops the acpi_config_table[] containing 2 entries per ACPI hardware-id if both drivers are enabled. snd_intel_acpi_dsp_find_config() will always return the first hit, so we only need a single entry with the flags value set depending on the Kconfig settings.

Suggested-by: Takashi Iwai tiwai@suse.de Signed-off-by: Hans de Goede hdegoede@redhat.com --- Changes in v2: - Rework following Takashi's suggestions --- sound/hda/Kconfig | 14 ++++++++++++++ sound/hda/intel-dsp-config.c | 29 ++++++++++++----------------- 2 files changed, 26 insertions(+), 17 deletions(-)

diff --git a/sound/hda/Kconfig b/sound/hda/Kconfig index 3bc9224d5e4f..9ed5cfa3c18c 100644 --- a/sound/hda/Kconfig +++ b/sound/hda/Kconfig @@ -46,3 +46,17 @@ config SND_INTEL_DSP_CONFIG select SND_INTEL_NHLT if ACPI # this config should be selected only for Intel DSP platforms. # A fallback is provided so that the code compiles in all cases. + +config SND_INTEL_BYT_PREFER_SOF + bool "Prefer SOF driver over SST on BY/CHT platforms" + depends on SND_SST_ATOM_HIFI2_PLATFORM_ACPI && SND_SOC_SOF_BAYTRAIL + default n + help + The kernel has 2 drivers for the Low Power Engine audio-block on + Bay- and Cherry-Trail SoCs. The old SST driver and the new SOF + driver. If both drivers are enabled then the kernel will default + to using the old SST driver, unless told otherwise through the + snd_intel_dspcfg.dsp_driver module-parameter. + + Set this option to Y to make the kernel default to the new SOF + driver instead. diff --git a/sound/hda/intel-dsp-config.c b/sound/hda/intel-dsp-config.c index c45686172517..68bb977c6a37 100644 --- a/sound/hda/intel-dsp-config.c +++ b/sound/hda/intel-dsp-config.c @@ -452,35 +452,30 @@ int snd_intel_dsp_driver_probe(struct pci_dev *pci) } EXPORT_SYMBOL_GPL(snd_intel_dsp_driver_probe);

+/* Should we default to SOF or SST for BYT/CHT ? */ +#if IS_ENABLED(CONFIG_SND_INTEL_BYT_PREFER_SOF) || \ + !IS_ENABLED(CONFIG_SND_SST_ATOM_HIFI2_PLATFORM_ACPI) +#define FLAG_SST_OR_SOF_BYT FLAG_SOF +#else +#define FLAG_SST_OR_SOF_BYT FLAG_SST +#endif + /* * configuration table * - the order of similar ACPI ID entries is important! * - the first successful match will win */ static const struct config_entry acpi_config_table[] = { +#if IS_ENABLED(CONFIG_SND_SST_ATOM_HIFI2_PLATFORM_ACPI) || \ + IS_ENABLED(CONFIG_SND_SOC_SOF_BAYTRAIL) /* BayTrail */ -#if IS_ENABLED(CONFIG_SND_SST_ATOM_HIFI2_PLATFORM_ACPI) - { - .flags = FLAG_SST, - .acpi_hid = "80860F28", - }, -#endif -#if IS_ENABLED(CONFIG_SND_SOC_SOF_BAYTRAIL) { - .flags = FLAG_SOF, + .flags = FLAG_SST_OR_SOF_BYT, .acpi_hid = "80860F28", }, -#endif /* CherryTrail */ -#if IS_ENABLED(CONFIG_SND_SST_ATOM_HIFI2_PLATFORM_ACPI) - { - .flags = FLAG_SST, - .acpi_hid = "808622A8", - }, -#endif -#if IS_ENABLED(CONFIG_SND_SOC_SOF_BAYTRAIL) { - .flags = FLAG_SOF, + .flags = FLAG_SST_OR_SOF_BYT, .acpi_hid = "808622A8", }, #endif