diff mbox series

[v24,17/34] ASoC: qcom: qdsp6: Add USB backend ASoC driver for Q6

Message ID 20240801011730.4797-18-quic_wcheng@quicinc.com
State Superseded
Headers show
Series [v24,01/34] xhci: add helper to stop endpoint and wait for completion | expand

Commit Message

Wesley Cheng Aug. 1, 2024, 1:17 a.m. UTC 
Create a USB BE component that will register a new USB port to the ASoC USB
framework.  This will handle determination on if the requested audio
profile is supported by the USB device currently selected.

Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
---
 include/sound/q6usboffload.h  |  20 +++
 sound/soc/qcom/Kconfig        |  10 ++
 sound/soc/qcom/qdsp6/Makefile |   1 +
 sound/soc/qcom/qdsp6/q6usb.c  | 238 ++++++++++++++++++++++++++++++++++
 4 files changed, 269 insertions(+)
 create mode 100644 include/sound/q6usboffload.h
 create mode 100644 sound/soc/qcom/qdsp6/q6usb.c

Comments

Pierre-Louis Bossart Aug. 1, 2024, 8:40 a.m. UTC | #1 
> +static int q6usb_hw_params(struct snd_pcm_substream *substream,
> +			   struct snd_pcm_hw_params *params,
> +			   struct snd_soc_dai *dai)
> +{
> +	struct q6usb_port_data *data = dev_get_drvdata(dai->dev);
> +	struct snd_soc_pcm_runtime *rtd = substream->private_data;
> +	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
> +	struct q6afe_port *q6usb_afe;
> +	struct snd_soc_usb_device *sdev;
> +	int ret;
> +
> +	/* No active chip index */
> +	if (list_empty(&data->devices))
> +		return -EINVAL;
> +
> +	mutex_lock(&data->mutex);
> +	sdev = list_last_entry(&data->devices, struct snd_soc_usb_device, list);
> +
> +	q6usb_afe = q6afe_port_get_from_id(cpu_dai->dev, USB_RX);
> +	if (IS_ERR(q6usb_afe))
> +		goto out;
> +
> +	/* Notify audio DSP about the devices being offloaded */
> +	ret = afe_port_send_usb_dev_param(q6usb_afe, sdev->card_idx,
> +						sdev->pcm_idx);
> +
> +out:
> +	mutex_unlock(&data->mutex);
> +
> +	return ret;
> +}

Humm, multiple questions here

a) is this intentional that the params are not used in a hw_params routine?

b) if yes, could this be replaced by a .prepare callback

c) along the same lines as b), is suspend-resume during playback
supported? Usually this is handled with a .prepare callback to restore
connections.
> +
> +static const struct snd_soc_dai_ops q6usb_ops = {
> +	.hw_params = q6usb_hw_params,
> +};
Wesley Cheng Aug. 1, 2024, 11:10 p.m. UTC | #2 
Hi Pierre,

On 8/1/2024 1:40 AM, Pierre-Louis Bossart wrote:
>
>
>> +static int q6usb_hw_params(struct snd_pcm_substream *substream,
>> +			   struct snd_pcm_hw_params *params,
>> +			   struct snd_soc_dai *dai)
>> +{
>> +	struct q6usb_port_data *data = dev_get_drvdata(dai->dev);
>> +	struct snd_soc_pcm_runtime *rtd = substream->private_data;
>> +	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
>> +	struct q6afe_port *q6usb_afe;
>> +	struct snd_soc_usb_device *sdev;
>> +	int ret;
>> +
>> +	/* No active chip index */
>> +	if (list_empty(&data->devices))
>> +		return -EINVAL;
>> +
>> +	mutex_lock(&data->mutex);
>> +	sdev = list_last_entry(&data->devices, struct snd_soc_usb_device, list);
>> +
>> +	q6usb_afe = q6afe_port_get_from_id(cpu_dai->dev, USB_RX);
>> +	if (IS_ERR(q6usb_afe))
>> +		goto out;
>> +
>> +	/* Notify audio DSP about the devices being offloaded */
>> +	ret = afe_port_send_usb_dev_param(q6usb_afe, sdev->card_idx,
>> +						sdev->pcm_idx);
>> +
>> +out:
>> +	mutex_unlock(&data->mutex);
>> +
>> +	return ret;
>> +}
> Humm, multiple questions here
>
> a) is this intentional that the params are not used in a hw_params routine?
Think this was answered in patch#34.
> b) if yes, could this be replaced by a .prepare callback
>
> c) along the same lines as b), is suspend-resume during playback
> supported? Usually this is handled with a .prepare callback to restore
> connections.

I don't see us supporting that throughout any of the QC based DAI drivers, so this probably isn't implemented yet.  In terms of supporting system PM suspend for this USB offload path, we're going to explicitly stop the audio stream from the USB offload driver (qc_audio_offload) before we suspend the usb device. (refer to qc_usb_audio_offload_suspend())

Thanks

Wesley Cheng

>> +
>> +static const struct snd_soc_dai_ops q6usb_ops = {
>> +	.hw_params = q6usb_hw_params,
>> +};
>
Pierre-Louis Bossart Aug. 2, 2024, 6:32 a.m. UTC | #3 
On 8/2/24 01:10, Wesley Cheng wrote:
> Hi Pierre,
> 
> On 8/1/2024 1:40 AM, Pierre-Louis Bossart wrote:
>>
>>
>>> +static int q6usb_hw_params(struct snd_pcm_substream *substream,
>>> +			   struct snd_pcm_hw_params *params,
>>> +			   struct snd_soc_dai *dai)
>>> +{
>>> +	struct q6usb_port_data *data = dev_get_drvdata(dai->dev);
>>> +	struct snd_soc_pcm_runtime *rtd = substream->private_data;
>>> +	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
>>> +	struct q6afe_port *q6usb_afe;
>>> +	struct snd_soc_usb_device *sdev;
>>> +	int ret;
>>> +
>>> +	/* No active chip index */
>>> +	if (list_empty(&data->devices))
>>> +		return -EINVAL;
>>> +
>>> +	mutex_lock(&data->mutex);
>>> +	sdev = list_last_entry(&data->devices, struct snd_soc_usb_device, list);
>>> +
>>> +	q6usb_afe = q6afe_port_get_from_id(cpu_dai->dev, USB_RX);
>>> +	if (IS_ERR(q6usb_afe))
>>> +		goto out;
>>> +
>>> +	/* Notify audio DSP about the devices being offloaded */
>>> +	ret = afe_port_send_usb_dev_param(q6usb_afe, sdev->card_idx,
>>> +						sdev->pcm_idx);
>>> +
>>> +out:
>>> +	mutex_unlock(&data->mutex);
>>> +
>>> +	return ret;
>>> +}
>> Humm, multiple questions here
>>
>> a) is this intentional that the params are not used in a hw_params routine?
> Think this was answered in patch#34.

yes, but that really begs the question if the format check shouldn't be
added here.

>> b) if yes, could this be replaced by a .prepare callback
>>
>> c) along the same lines as b), is suspend-resume during playback
>> supported? Usually this is handled with a .prepare callback to restore
>> connections.
> 
> I don't see us supporting that throughout any of the QC based DAI drivers, so this probably isn't implemented yet.  In terms of supporting system PM suspend for this USB offload path, we're going to explicitly stop the audio stream from the USB offload driver (qc_audio_offload) before we suspend the usb device. (refer to qc_usb_audio_offload_suspend()

The system suspend-resume during playback is not enabled in all
platforms indeed, it mostly depends on what userspace does. IIRC this is
required for Chrome/CRAS and it's supported by aplay.
diff mbox series

Patch

diff --git a/include/sound/q6usboffload.h b/include/sound/q6usboffload.h
new file mode 100644
index 000000000000..fdc1f5c53a3b
--- /dev/null
+++ b/include/sound/q6usboffload.h
@@ -0,0 +1,20 @@ 
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * linux/sound/q6usboffload.h -- QDSP6 USB offload
+ *
+ * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+/**
+ * struct q6usb_offload
+ * @dev - dev handle to usb be
+ * @sid - streamID for iommu
+ * @intr_num - usb interrupter number
+ * @domain - allocated iommu domain
+ **/
+struct q6usb_offload {
+	struct device *dev;
+	long long sid;
+	u16 intr_num;
+	struct iommu_domain *domain;
+};
diff --git a/sound/soc/qcom/Kconfig b/sound/soc/qcom/Kconfig
index 762491d6f2f2..a1beafe2b1dd 100644
--- a/sound/soc/qcom/Kconfig
+++ b/sound/soc/qcom/Kconfig
@@ -118,6 +118,16 @@  config SND_SOC_QDSP6_PRM
 	tristate
 	select SND_SOC_QDSP6_PRM_LPASS_CLOCKS
 
+config SND_SOC_QDSP6_USB
+    tristate "SoC ALSA USB offloading backing for QDSP6"
+    depends on SND_SOC_USB
+    help
+      Adds support for USB offloading for QDSP6 ASoC
+      based platform sound cards.  This will enable the
+      Q6USB DPCM backend DAI link, which will interact
+      with the SoC USB framework to initialize a session
+      with active USB SND devices.
+
 config SND_SOC_QDSP6
 	tristate "SoC ALSA audio driver for QDSP6"
 	depends on QCOM_APR
diff --git a/sound/soc/qcom/qdsp6/Makefile b/sound/soc/qcom/qdsp6/Makefile
index 26b7c55c9c11..67267304e7e9 100644
--- a/sound/soc/qcom/qdsp6/Makefile
+++ b/sound/soc/qcom/qdsp6/Makefile
@@ -17,3 +17,4 @@  obj-$(CONFIG_SND_SOC_QDSP6_APM_DAI) += q6apm-dai.o
 obj-$(CONFIG_SND_SOC_QDSP6_APM_LPASS_DAI) += q6apm-lpass-dais.o
 obj-$(CONFIG_SND_SOC_QDSP6_PRM) += q6prm.o
 obj-$(CONFIG_SND_SOC_QDSP6_PRM_LPASS_CLOCKS) += q6prm-clocks.o
+obj-$(CONFIG_SND_SOC_QDSP6_USB) += q6usb.o
diff --git a/sound/soc/qcom/qdsp6/q6usb.c b/sound/soc/qcom/qdsp6/q6usb.c
new file mode 100644
index 000000000000..9a46532e8c16
--- /dev/null
+++ b/sound/soc/qcom/qdsp6/q6usb.c
@@ -0,0 +1,238 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/dma-map-ops.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <sound/asound.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/q6usboffload.h>
+#include <sound/soc.h>
+#include <sound/soc-usb.h>
+
+#include <dt-bindings/sound/qcom,q6afe.h>
+
+#include "q6afe.h"
+#include "q6dsp-lpass-ports.h"
+
+#define Q6_USB_SID_MASK	0xF
+
+struct q6usb_port_data {
+	struct q6afe_usb_cfg usb_cfg;
+	struct snd_soc_usb *usb;
+	struct q6usb_offload priv;
+	struct mutex mutex;
+	struct list_head devices;
+};
+
+static const struct snd_soc_dapm_widget q6usb_dai_widgets[] = {
+	SND_SOC_DAPM_HP("USB_RX_BE", NULL),
+};
+
+static const struct snd_soc_dapm_route q6usb_dapm_routes[] = {
+	{"USB Playback", NULL, "USB_RX_BE"},
+};
+
+static int q6usb_hw_params(struct snd_pcm_substream *substream,
+			   struct snd_pcm_hw_params *params,
+			   struct snd_soc_dai *dai)
+{
+	struct q6usb_port_data *data = dev_get_drvdata(dai->dev);
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
+	struct q6afe_port *q6usb_afe;
+	struct snd_soc_usb_device *sdev;
+	int ret;
+
+	/* No active chip index */
+	if (list_empty(&data->devices))
+		return -EINVAL;
+
+	mutex_lock(&data->mutex);
+	sdev = list_last_entry(&data->devices, struct snd_soc_usb_device, list);
+
+	q6usb_afe = q6afe_port_get_from_id(cpu_dai->dev, USB_RX);
+	if (IS_ERR(q6usb_afe))
+		goto out;
+
+	/* Notify audio DSP about the devices being offloaded */
+	ret = afe_port_send_usb_dev_param(q6usb_afe, sdev->card_idx,
+						sdev->pcm_idx);
+
+out:
+	mutex_unlock(&data->mutex);
+
+	return ret;
+}
+
+static const struct snd_soc_dai_ops q6usb_ops = {
+	.hw_params = q6usb_hw_params,
+};
+
+static struct snd_soc_dai_driver q6usb_be_dais[] = {
+	{
+		.playback = {
+			.stream_name = "USB BE RX",
+			.rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
+				SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |
+				SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
+				SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 |
+				SNDRV_PCM_RATE_192000,
+			.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
+				SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE |
+				SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |
+				SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_U24_BE,
+			.channels_min = 1,
+			.channels_max = 2,
+			.rate_max =     192000,
+			.rate_min =	8000,
+		},
+		.id = USB_RX,
+		.name = "USB_RX_BE",
+		.ops = &q6usb_ops,
+	},
+};
+
+static int q6usb_audio_ports_of_xlate_dai_name(struct snd_soc_component *component,
+					const struct of_phandle_args *args,
+					const char **dai_name)
+{
+	int id = args->args[0];
+	int ret = -EINVAL;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(q6usb_be_dais); i++) {
+		if (q6usb_be_dais[i].id == id) {
+			*dai_name = q6usb_be_dais[i].name;
+			ret = 0;
+			break;
+		}
+	}
+
+	return ret;
+}
+
+static int q6usb_alsa_connection_cb(struct snd_soc_usb *usb,
+			struct snd_soc_usb_device *sdev, bool connected)
+{
+	struct q6usb_port_data *data;
+
+	if (!usb->component)
+		return -ENODEV;
+
+	data = dev_get_drvdata(usb->component->dev);
+
+	mutex_lock(&data->mutex);
+	if (connected) {
+		/* Selects the latest USB headset plugged in for offloading */
+		list_add_tail(&sdev->list, &data->devices);
+	} else {
+		list_del(&sdev->list);
+	}
+	mutex_unlock(&data->mutex);
+
+	return 0;
+}
+
+static int q6usb_component_probe(struct snd_soc_component *component)
+{
+	struct q6usb_port_data *data = dev_get_drvdata(component->dev);
+	struct snd_soc_usb *usb;
+
+	usb = snd_soc_usb_allocate_port(component, 1, &data->priv);
+	if (IS_ERR(usb))
+		return -ENOMEM;
+
+	usb->connection_status_cb = q6usb_alsa_connection_cb;
+
+	snd_soc_usb_add_port(usb);
+	data->usb = usb;
+
+	return 0;
+}
+
+static void q6usb_component_remove(struct snd_soc_component *component)
+{
+	struct q6usb_port_data *data = dev_get_drvdata(component->dev);
+
+	snd_soc_usb_remove_port(data->usb);
+	snd_soc_usb_free_port(data->usb);
+}
+
+static const struct snd_soc_component_driver q6usb_dai_component = {
+	.probe = q6usb_component_probe,
+	.remove = q6usb_component_remove,
+	.name = "q6usb-dai-component",
+	.dapm_widgets = q6usb_dai_widgets,
+	.num_dapm_widgets = ARRAY_SIZE(q6usb_dai_widgets),
+	.dapm_routes = q6usb_dapm_routes,
+	.num_dapm_routes = ARRAY_SIZE(q6usb_dapm_routes),
+	.of_xlate_dai_name = q6usb_audio_ports_of_xlate_dai_name,
+};
+
+static int q6usb_dai_dev_probe(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct q6usb_port_data *data;
+	struct device *dev = &pdev->dev;
+	struct of_phandle_args args;
+	int ret;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	ret = of_property_read_u16(node, "qcom,usb-audio-intr-idx",
+				&data->priv.intr_num);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to read intr idx.\n");
+		return ret;
+	}
+
+	ret = of_parse_phandle_with_fixed_args(node, "iommus", 1, 0, &args);
+	if (ret < 0)
+		data->priv.sid = -1;
+	else
+		data->priv.sid = args.args[0] & Q6_USB_SID_MASK;
+
+	data->priv.domain = iommu_get_domain_for_dev(&pdev->dev);
+
+	data->priv.dev = dev;
+	INIT_LIST_HEAD(&data->devices);
+	dev_set_drvdata(dev, data);
+
+	return devm_snd_soc_register_component(dev, &q6usb_dai_component,
+					q6usb_be_dais, ARRAY_SIZE(q6usb_be_dais));
+}
+
+static const struct of_device_id q6usb_dai_device_id[] = {
+	{ .compatible = "qcom,q6usb" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, q6usb_dai_device_id);
+
+static struct platform_driver q6usb_dai_platform_driver = {
+	.driver = {
+		.name = "q6usb-dai",
+		.of_match_table = of_match_ptr(q6usb_dai_device_id),
+	},
+	.probe = q6usb_dai_dev_probe,
+	/*
+	 * Remove not required as resources are cleaned up as part of
+	 * component removal.  Others are device managed resources.
+	 */
+};
+module_platform_driver(q6usb_dai_platform_driver);
+
+MODULE_DESCRIPTION("Q6 USB backend dai driver");
+MODULE_LICENSE("GPL");