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ALSA: hda/intel: stop probe if DMICS are detected on Skylake+ platforms 

The legacy HD-Audio driver cannot handle Skylake+ platforms with
digital microphones. For those platforms, the SOF or SST drivers need
to be used.

This patch provides an automatic way of detecting the presence of
DMICs using NHTL information reported by the BIOS. A kernel kconfig
option or a kernel module parameter provide an opt-in means of
stopping the probe. The kernel would then look for an alternate driver
registered for the same PCI ID to probe.

With this capability, distros no longer have to blacklist
snd-hda-intel, but still need to make sure the SOF/SST drivers are
functional by providing the relevant firmware and topology files in
/lib/firmware/intel

The coexistence between SOF and SST drivers and their dynamic
detection is not addressed by this patch, different mechanisms need to
be used, e.g. DMI-based quirks.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Pierre-Louis Bossart 2019-07-29 10:51:51 -05:00 committed by Takashi Iwai
parent 1169cbf6b9
commit 8c57588313
2 changed files with 44 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
sound/pci/hda/Kconfig
View File

@ -12,6 +12,7 @@ config SND_HDA_INTEL
tristate "HD Audio PCI"
depends on SND_PCI
select SND_HDA
select SND_INTEL_NHLT if ACPI
help
Say Y here to include support for Intel "High Definition
Audio" (Azalia) and its compatible devices.
@ -22,6 +23,15 @@ config SND_HDA_INTEL
To compile this driver as a module, choose M here: the module
will be called snd-hda-intel.
config SND_HDA_INTEL_DETECT_DMIC
bool "DMIC detection and probe abort"
depends on SND_HDA_INTEL
help
Say Y to detect digital microphones on SKL+ devices. DMICs
cannot be handled by the HDaudio legacy driver and are
currently only supported by the SOF driver.
If unsure say N.
config SND_HDA_TEGRA
tristate "NVIDIA Tegra HD Audio"
depends on ARCH_TEGRA

34
sound/pci/hda/hda_intel.c
View File

@ -46,6 +46,7 @@
#include <sound/initval.h>
#include <sound/hdaudio.h>
#include <sound/hda_i915.h>
#include <sound/intel-nhlt.h>
#include <linux/vgaarb.h>
#include <linux/vga_switcheroo.h>
#include <linux/firmware.h>
@ -124,6 +125,7 @@ static char *patch[SNDRV_CARDS];
static bool beep_mode[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] =
CONFIG_SND_HDA_INPUT_BEEP_MODE};
#endif
static bool dmic_detect = IS_ENABLED(CONFIG_SND_HDA_INTEL_DETECT_DMIC);
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for Intel HD audio interface.");
@ -158,6 +160,8 @@ module_param_array(beep_mode, bool, NULL, 0444);
MODULE_PARM_DESC(beep_mode, "Select HDA Beep registration mode "
"(0=off, 1=on) (default=1).");
#endif
module_param(dmic_detect, bool, 0444);
MODULE_PARM_DESC(dmic_detect, "DMIC detect on SKL+ platforms");
#ifdef CONFIG_PM
static int param_set_xint(const char *val, const struct kernel_param *kp);
@ -2025,6 +2029,25 @@ static const struct hda_controller_ops pci_hda_ops = {
.position_check = azx_position_check,
};
static int azx_check_dmic(struct pci_dev *pci, struct azx *chip)
{
struct nhlt_acpi_table *nhlt;
int ret = 0;
if (chip->driver_type == AZX_DRIVER_SKL &&
pci->class != 0x040300) {
nhlt = intel_nhlt_init(&pci->dev);
if (nhlt) {
if (intel_nhlt_get_dmic_geo(&pci->dev, nhlt)) {
ret = -ENODEV;
dev_info(&pci->dev, "Digital mics found on Skylake+ platform, aborting probe\n");
}
intel_nhlt_free(nhlt);
}
}
return ret;
}
static int azx_probe(struct pci_dev *pci,
const struct pci_device_id *pci_id)
{
@ -2055,6 +2078,17 @@ static int azx_probe(struct pci_dev *pci,
card->private_data = chip;
hda = container_of(chip, struct hda_intel, chip);
/*
* stop probe if digital microphones detected on Skylake+ platform
* with the DSP enabled. This is an opt-in behavior defined at build
* time or at run-time with a module parameter
*/
if (dmic_detect) {
err = azx_check_dmic(pci, chip);
if (err < 0)
goto out_free;
}
pci_set_drvdata(pci, card);
err = register_vga_switcheroo(chip);