[PATCH v2] ALSA: hda: intel-dsp-config: Add SND_INTEL_BYT_PREFER_SOF Kconfig option

[Pierre-Louis Bossart]

On 2/8/21 7:59 AM, Hans de Goede wrote:
> 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 at suse.de>
> Signed-off-by: Hans de Goede <hdegoede at redhat.com>

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>

Thanks Hans!