[alsa-devel] [PATCH] ALSA: hda: add Intel DSP configuration / probe code

* [alsa-devel] [PATCH] ALSA: hda: add Intel DSP configuration / probe code
@ 2019-10-02 11:35 Jaroslav Kysela
  2019-10-02 16:00 ` Pierre-Louis Bossart
  2019-10-02 16:07 ` kbuild test robot
  0 siblings, 2 replies; 5+ messages in thread
From: Jaroslav Kysela @ 2019-10-02 11:35 UTC (permalink / raw)
  To: ALSA development; +Cc: Takashi Iwai, Cezary Rojewski, Pierre-Louis Bossart

For distributions, we need one place where we can decide
which driver will be activated for the auto-configation of the
Intel's HDA hardware with DSP. Actually, we cover three drivers:

* Legacy HDA
* Intel SST
* Intel Sound Open Firmware (SOF)

All those drivers registers similar PCI IDs, so the first
driver probed from the PCI stack can win. But... it is not
guaranteed that the correct driver wins.

This commit changes Intel's NHLT ACPI module to a common
DSP probe module for the Intel's hardware. All above sound
drivers calls this code. The user can force another behaviour
using the module parameter 'dsp_driver' located in
the 'snd-intel-dspcfg' module.

This change allows to add specific dmi checks for the specific
systems like proposed in the pull request:

  https://github.com/thesofproject/linux/pull/927

Tested on Lenovo Carbon X1 7th gen.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: Cezary Rojewski <cezary.rojewski@intel.com>
---
 include/sound/intel-dsp-config.h | 35 ++++++++++++
 sound/hda/Kconfig                | 10 +++-
 sound/hda/Makefile               |  7 ++-
 sound/hda/intel-dsp-config.c     | 97 ++++++++++++++++++++++++++++++++
 sound/hda/intel-nhlt.c           |  3 -
 sound/pci/hda/Kconfig            | 11 +---
 sound/pci/hda/hda_intel.c        | 49 +++++-----------
 sound/soc/intel/Kconfig          |  2 +-
 sound/soc/intel/skylake/skl.c    | 19 ++-----
 sound/soc/sof/intel/Kconfig      |  2 +-
 sound/soc/sof/sof-pci-dev.c      |  6 ++
 11 files changed, 173 insertions(+), 68 deletions(-)
 create mode 100644 include/sound/intel-dsp-config.h
 create mode 100644 sound/hda/intel-dsp-config.c

diff --git a/include/sound/intel-dsp-config.h b/include/sound/intel-dsp-config.h
new file mode 100644
index 000000000000..700f86282a83
--- /dev/null
+++ b/include/sound/intel-dsp-config.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  intel-dsp-config.h - Intel DSP config
+ *
+ *  Copyright (c) 2019 Jaroslav Kysela <perex@perex.cz>
+ */
+
+#ifndef __INTEL_DSP_CONFIG_H__
+#define __INTEL_DSP_CONFIG_H__
+
+struct pci_dev;
+
+enum {
+	SND_INTEL_DSP_DRIVER_ANY = 0,
+	SND_INTEL_DSP_DRIVER_NODSP,
+	SND_INTEL_DSP_DRIVER_LEGACY,
+	SND_INTEL_DSP_DRIVER_SST,
+	SND_INTEL_DSP_DRIVER_SOF,
+	SND_INTEL_DSP_DRIVER_LAST = SND_INTEL_DSP_DRIVER_SOF
+};
+
+#if IS_ENABLED(CONFIG_SND_INTEL_DSP_CONFIG)
+
+int snd_intel_dsp_driver_probe(struct pci_dev *pci);
+
+#else
+
+static inline int snd_intel_dsp_driver_probe(struct pci_dev *pci)
+{
+	return SND_INTEL_DSP_DRIVER_ANY;
+}
+
+#endif
+
+#endif
diff --git a/sound/hda/Kconfig b/sound/hda/Kconfig
index 3d33fc1757ba..b0c88fe040ee 100644
--- a/sound/hda/Kconfig
+++ b/sound/hda/Kconfig
@@ -34,6 +34,12 @@ config SND_HDA_PREALLOC_SIZE
 	  via a proc file (/proc/asound/card*/pcm*/sub*/prealloc), too.
 
 config SND_INTEL_NHLT
-	tristate
+	bool
 	# this config should be selected only for Intel ACPI platforms.
-	# A fallback is provided so that the code compiles in all cases.
\ No newline at end of file
+	# A fallback is provided so that the code compiles in all cases.
+
+config SND_INTEL_DSP_CONFIG
+	tristate
+	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.
diff --git a/sound/hda/Makefile b/sound/hda/Makefile
index 8560f6ef1b19..c593253c9829 100644
--- a/sound/hda/Makefile
+++ b/sound/hda/Makefile
@@ -14,5 +14,8 @@ obj-$(CONFIG_SND_HDA_CORE) += snd-hda-core.o
 #extended hda
 obj-$(CONFIG_SND_HDA_EXT_CORE) += ext/
 
-snd-intel-nhlt-objs := intel-nhlt.o
-obj-$(CONFIG_SND_INTEL_NHLT) += snd-intel-nhlt.o
+snd-intel-dspcfg-objs := intel-dsp-config.o
+ifneq ($(CONFIG_ACPI),)
+  snd-intel-dspcfg-objs += intel-nhlt.o
+endif
+obj-$(CONFIG_SND_INTEL_DSP_CONFIG) += snd-intel-dspcfg.o
diff --git a/sound/hda/intel-dsp-config.c b/sound/hda/intel-dsp-config.c
new file mode 100644
index 000000000000..1abbf74ba643
--- /dev/null
+++ b/sound/hda/intel-dsp-config.c
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 Jaroslav Kysela <perex@perex.cz>
+
+#include <sound/core.h>
+#include <linux/pci.h>
+#include <sound/intel-nhlt.h>
+#include <sound/intel-dsp-config.h>
+
+static int dsp_driver;
+
+module_param(dsp_driver, int, 0444);
+MODULE_PARM_DESC(dsp_driver, "Force the DSP driver for Intel DSP (0=auto, 1=noDSP, 2=legacy, 3=SST, 4=SOF)");
+
+static const u16 sof_skl_table[] = {
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_COMETLAKE_LP)
+	0x02c8,	/* Cometlake-LP */
+#endif
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_COMETLAKE_H)
+	0x06c8,	/* Cometlake-H */
+#endif
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_GEMINILAKE)
+	0x3198,	/* Geminilake */
+#endif
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_APOLLOLAKE)
+	0x5a98,	/* Broxton-P (Appololake) */
+#endif
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_CANNONLAKE)
+	0x9dc8, /* Cannonlake */
+#endif
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_COFFEELAKE)
+	0xa348, /* Coffelake */
+#endif
+};
+
+static int snd_intel_dsp_check_device(u16 device, const u16 *table, u32 len)
+{
+	for (; len > 0; len--, table++) {
+		if (*table == device)
+			return 1;
+	}
+	return 0;
+}
+
+static int snd_intel_dsp_check_dmic(struct pci_dev *pci)
+{
+	struct nhlt_acpi_table *nhlt;
+	int ret = 0;
+
+	if (snd_intel_dsp_check_device(pci->device, sof_skl_table, ARRAY_SIZE(sof_skl_table))) {
+		nhlt = intel_nhlt_init(&pci->dev);
+		if (nhlt) {
+			if (intel_nhlt_get_dmic_geo(&pci->dev, nhlt))
+				ret = 1;
+			intel_nhlt_free(nhlt);
+		}
+	}
+	return ret;
+}
+
+int snd_intel_dsp_driver_probe(struct pci_dev *pci)
+{
+	if (dsp_driver > 0 && dsp_driver <= SND_INTEL_DSP_DRIVER_LAST)
+		return dsp_driver;
+
+	/* Intel vendor only */
+	if (snd_BUG_ON(pci->vendor != 0x8086))
+		return SND_INTEL_DSP_DRIVER_ANY;
+
+	/*
+	 * detect DSP by checking class/subclass/prog-id information
+	 * class=04 subclass 03 prog-if 00: no DSP, use legacy driver
+	 * class=04 subclass 01 prog-if 00: DSP is present
+	 *  (and may be required e.g. for DMIC or SSP support)
+	 * class=04 subclass 03 prog-if 80: use DSP or legacy mode
+	 */
+	if (pci->class == 0x040300)
+		return SND_INTEL_DSP_DRIVER_NODSP;
+	if (pci->class != 0x040100 && pci->class != 0x040380) {
+		dev_err(&pci->dev, "Unknown PCI class/subclass/prog-if information (0x%06x) found, selecting HDA legacy driver\n", pci->class);
+		return SND_INTEL_DSP_DRIVER_LEGACY;
+	}
+
+	dev_info(&pci->dev, "DSP detected with PCI class/subclass/prog-if info 0x%06x\n", pci->class);
+
+	/* DMIC check for Skylake+ */
+	if (snd_intel_dsp_check_dmic(pci)) {
+		dev_info(&pci->dev, "Digital mics found on Skylake+ platform, using SOF driver\n");
+		return SND_INTEL_DSP_DRIVER_SOF;
+	}
+
+	return SND_INTEL_DSP_DRIVER_ANY;
+}
+
+EXPORT_SYMBOL_GPL(snd_intel_dsp_driver_probe);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Intel DSP config driver");
diff --git a/sound/hda/intel-nhlt.c b/sound/hda/intel-nhlt.c
index daede96f28ee..097ff6c10099 100644
--- a/sound/hda/intel-nhlt.c
+++ b/sound/hda/intel-nhlt.c
@@ -102,6 +102,3 @@ int intel_nhlt_get_dmic_geo(struct device *dev, struct nhlt_acpi_table *nhlt)
 	return dmic_geo;
 }
 EXPORT_SYMBOL_GPL(intel_nhlt_get_dmic_geo);
-
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("Intel NHLT driver");
diff --git a/sound/pci/hda/Kconfig b/sound/pci/hda/Kconfig
index dae47a45b2b8..bd48335d09d7 100644
--- a/sound/pci/hda/Kconfig
+++ b/sound/pci/hda/Kconfig
@@ -12,7 +12,7 @@ config SND_HDA_INTEL
 	tristate "HD Audio PCI"
 	depends on SND_PCI
 	select SND_HDA
-	select SND_INTEL_NHLT if ACPI
+	select SND_INTEL_DSP_CONFIG
 	help
 	  Say Y here to include support for Intel "High Definition
 	  Audio" (Azalia) and its compatible devices.
@@ -23,15 +23,6 @@ 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
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 240f4ca76391..c76c2deea47c 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -46,7 +46,7 @@
 #include <sound/initval.h>
 #include <sound/hdaudio.h>
 #include <sound/hda_i915.h>
-#include <sound/intel-nhlt.h>
+#include <sound/intel-dsp-config.h>
 #include <linux/vgaarb.h>
 #include <linux/vga_switcheroo.h>
 #include <linux/firmware.h>
@@ -124,7 +124,7 @@ 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);
+static bool no_dsp_driver;
 
 module_param_array(index, int, NULL, 0444);
 MODULE_PARM_DESC(index, "Index value for Intel HD audio interface.");
@@ -159,8 +159,8 @@ 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");
+module_param(no_dsp_driver, bool, 0444);
+MODULE_PARM_DESC(no_dsp_driver, "Do not return from probe when another DSP driver claims device");
 
 #ifdef CONFIG_PM
 static int param_set_xint(const char *val, const struct kernel_param *kp);
@@ -2020,25 +2020,6 @@ 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)
 {
@@ -2056,6 +2037,17 @@ static int azx_probe(struct pci_dev *pci,
 		return -ENOENT;
 	}
 
+	/*
+	 * stop probe if another Intel's DSP driver should be activated
+	 */
+	if (!no_dsp_driver) {
+		err = snd_intel_dsp_driver_probe(pci);
+		if (err != SND_INTEL_DSP_DRIVER_ANY &&
+		    err != SND_INTEL_DSP_DRIVER_NODSP &&
+		    err != SND_INTEL_DSP_DRIVER_LEGACY)
+			return -ENODEV;
+	}
+
 	err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
 			   0, &card);
 	if (err < 0) {
@@ -2069,17 +2061,6 @@ 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);
diff --git a/sound/soc/intel/Kconfig b/sound/soc/intel/Kconfig
index 01c99750212a..9ad89d56092b 100644
--- a/sound/soc/intel/Kconfig
+++ b/sound/soc/intel/Kconfig
@@ -215,7 +215,7 @@ config SND_SOC_INTEL_SKYLAKE_COMMON
 	select SND_SOC_INTEL_SST
 	select SND_SOC_HDAC_HDA if SND_SOC_INTEL_SKYLAKE_HDAUDIO_CODEC
 	select SND_SOC_ACPI_INTEL_MATCH
-	select SND_INTEL_NHLT if ACPI
+	select SND_INTEL_DSP_CONFIG
 	help
 	  If you have a Intel Skylake/Broxton/ApolloLake/KabyLake/
 	  GeminiLake or CannonLake platform with the DSP enabled in the BIOS
diff --git a/sound/soc/intel/skylake/skl.c b/sound/soc/intel/skylake/skl.c
index 141dbbf975ac..58ba3e9469ba 100644
--- a/sound/soc/intel/skylake/skl.c
+++ b/sound/soc/intel/skylake/skl.c
@@ -27,6 +27,7 @@
 #include <sound/hda_i915.h>
 #include <sound/hda_codec.h>
 #include <sound/intel-nhlt.h>
+#include <sound/intel-dsp-config.h>
 #include "skl.h"
 #include "skl-sst-dsp.h"
 #include "skl-sst-ipc.h"
@@ -987,22 +988,10 @@ static int skl_probe(struct pci_dev *pci,
 
 	switch (skl_pci_binding) {
 	case SND_SKL_PCI_BIND_AUTO:
-		/*
-		 * detect DSP by checking class/subclass/prog-id information
-		 * class=04 subclass 03 prog-if 00: no DSP, use legacy driver
-		 * class=04 subclass 01 prog-if 00: DSP is present
-		 *   (and may be required e.g. for DMIC or SSP support)
-		 * class=04 subclass 03 prog-if 80: use DSP or legacy mode
-		 */
-		if (pci->class == 0x040300) {
-			dev_info(&pci->dev, "The DSP is not enabled on this platform, aborting probe\n");
+		err = snd_intel_dsp_driver_probe(pci);
+		if (err != SND_INTEL_DSP_DRIVER_ANY &&
+		    err != SND_INTEL_DSP_DRIVER_SST)
 			return -ENODEV;
-		}
-		if (pci->class != 0x040100 && pci->class != 0x040380) {
-			dev_err(&pci->dev, "Unknown PCI class/subclass/prog-if information (0x%06x) found, aborting probe\n", pci->class);
-			return -ENODEV;
-		}
-		dev_info(&pci->dev, "DSP detected with PCI class/subclass/prog-if info 0x%06x\n", pci->class);
 		break;
 	case SND_SKL_PCI_BIND_LEGACY:
 		dev_info(&pci->dev, "Module parameter forced binding with HDaudio legacy, aborting probe\n");
diff --git a/sound/soc/sof/intel/Kconfig b/sound/soc/sof/intel/Kconfig
index 479ba249e219..8a5d5c0f95f2 100644
--- a/sound/soc/sof/intel/Kconfig
+++ b/sound/soc/sof/intel/Kconfig
@@ -286,7 +286,7 @@ 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 SND_INTEL_NHLT if ACPI
+	select SND_INTEL_DSP_CONFIG
 	help
 	  This option is not user-selectable but automagically handled by
 	  'select' statements at a higher level
diff --git a/sound/soc/sof/sof-pci-dev.c b/sound/soc/sof/sof-pci-dev.c
index d66412a77873..3a9e0e2a150d 100644
--- a/sound/soc/sof/sof-pci-dev.c
+++ b/sound/soc/sof/sof-pci-dev.c
@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/pm_runtime.h>
+#include <sound/intel-dsp-config.h>
 #include <sound/soc-acpi.h>
 #include <sound/soc-acpi-intel-match.h>
 #include <sound/sof.h>
@@ -277,6 +278,11 @@ static int sof_pci_probe(struct pci_dev *pci,
 	const struct snd_sof_dsp_ops *ops;
 	int ret;
 
+	ret = snd_intel_dsp_driver_probe(pci);
+	if (ret != SND_INTEL_DSP_DRIVER_ANY &&
+	    ret != SND_INTEL_DSP_DRIVER_SOF)
+		return -ENODEV;
+
 	dev_dbg(&pci->dev, "PCI DSP detected");
 
 	/* get ops for platform */
-- 
2.20.1
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