ASoC: SOF: Make creation of machine device from SOF core optional

Currently, SOF probes machine drivers by creating a platform device
and passing the machine description as private data.

This is driven by the ACPI restrictions. Ideally, ACPI tables
should contain the description for the machine driver. This is
not possible because ACPI tables are frozen and used on multiple
OS-es (e.g Windows).

In the case of Device Tree we don't have this restriction, so we
choose to probe the machine drivers by creating a DT node as is
the standard ALSA way.

This patch makes the probing of machine drivers from SOF
core optional allowing for Device Tree platforms to decouple
the SOF core from machine driver probing.

Along with this, it also consolidates the machine driver selection
for Intel platforms by defining optional ops for selecting the machine
driver based on the ACPI match for HDA and non-HDA platforms and
setting the mach params.

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191204211556.12671-11-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/sound/soc/sof/intel/byt.c b/sound/soc/sof/intel/byt.c
index 2abf80b3eb52..2f5db1a8c701 100644
--- a/sound/soc/sof/intel/byt.c
+++ b/sound/soc/sof/intel/byt.c
@@ -17,6 +17,7 @@
 #include <sound/sof/xtensa.h>
 #include "../ops.h"
 #include "shim.h"
+#include "../sof-audio.h"
 
 /* DSP memories */
 #define IRAM_OFFSET		0x0C0000
@@ -382,6 +383,32 @@ static int byt_reset(struct snd_sof_dev *sdev)
 	return 0;
 }
 
+static void byt_machine_select(struct snd_sof_dev *sdev)
+{
+	struct snd_sof_pdata *sof_pdata = sdev->pdata;
+	const struct sof_dev_desc *desc = sof_pdata->desc;
+	struct snd_soc_acpi_mach *mach;
+
+	mach = snd_soc_acpi_find_machine(desc->machines);
+	if (!mach) {
+		dev_warn(sdev->dev, "warning: No matching ASoC machine driver found\n");
+		return;
+	}
+
+	sof_pdata->tplg_filename = mach->sof_tplg_filename;
+	mach->mach_params.acpi_ipc_irq_index = desc->irqindex_host_ipc;
+	sof_pdata->machine = mach;
+}
+
+static void byt_set_mach_params(const struct snd_soc_acpi_mach *mach,
+				struct device *dev)
+{
+	struct snd_soc_acpi_mach_params *mach_params;
+
+	mach_params = (struct snd_soc_acpi_mach_params *)&mach->mach_params;
+	mach_params->platform = dev_name(dev);
+}
+
 /* Baytrail DAIs */
 static struct snd_soc_dai_driver byt_dai[] = {
 {
@@ -514,6 +541,12 @@ const struct snd_sof_dsp_ops sof_tng_ops = {
 	.ipc_msg_data	= intel_ipc_msg_data,
 	.ipc_pcm_params	= intel_ipc_pcm_params,
 
+	/* machine driver */
+	.machine_select = byt_machine_select,
+	.machine_register = sof_machine_register,
+	.machine_unregister = sof_machine_unregister,
+	.set_mach_params = byt_set_mach_params,
+
 	/* debug */
 	.debug_map	= byt_debugfs,
 	.debug_map_count	= ARRAY_SIZE(byt_debugfs),
@@ -682,6 +715,12 @@ const struct snd_sof_dsp_ops sof_byt_ops = {
 	.ipc_msg_data	= intel_ipc_msg_data,
 	.ipc_pcm_params	= intel_ipc_pcm_params,
 
+	/* machine driver */
+	.machine_select = byt_machine_select,
+	.machine_register = sof_machine_register,
+	.machine_unregister = sof_machine_unregister,
+	.set_mach_params = byt_set_mach_params,
+
 	/* debug */
 	.debug_map	= byt_debugfs,
 	.debug_map_count	= ARRAY_SIZE(byt_debugfs),
@@ -748,6 +787,12 @@ const struct snd_sof_dsp_ops sof_cht_ops = {
 	.ipc_msg_data	= intel_ipc_msg_data,
 	.ipc_pcm_params	= intel_ipc_pcm_params,
 
+	/* machine driver */
+	.machine_select = byt_machine_select,
+	.machine_register = sof_machine_register,
+	.machine_unregister = sof_machine_unregister,
+	.set_mach_params = byt_set_mach_params,
+
 	/* debug */
 	.debug_map	= cht_debugfs,
 	.debug_map_count	= ARRAY_SIZE(cht_debugfs),