asoc: add pm qos mixer controls

When device enters LPM, it hurts audio latency as
CPU spends more time in entering/exiting LPM.
Hence, for LL and/or ULL, LPM is disabled.
Add pm qos mixer controls for cpu affinity and
increase the delay for the cores to enter LPM mode.

Change-Id: I3aa2d17f6b3ec3ffad180205085bd2f4961858b7
Signed-off-by: Srinivas Marka <quic_smarka@quicinc.com>

asoc/kalama.c

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2016-2021, The Linux Foundation. All rights reserved.
- * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021-2022. Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/clk.h>
@@ -51,9 +51,6 @@
 #define DEV_NAME_STR_LEN            32
 #define WCD_MBHC_HS_V_MAX           1600
 
-#define MSM_LL_QOS_VALUE	300 /* time in us to ensure LPM doesn't go in C3/C4 */
-
-
 #define WCN_CDC_SLIM_RX_CH_MAX 2
 #define WCN_CDC_SLIM_TX_CH_MAX 2
 #define WCN_CDC_SLIM_TX_CH_MAX_LITO 3
@@ -123,53 +120,6 @@ static struct wcd_mbhc_config wcd_mbhc_cfg = {
 	.moisture_duty_cycle_en = true,
 };
 
-/* set audio task affinity to core 1 & 2 */
-static const unsigned int audio_core_list[] = {1, 2};
-static cpumask_t audio_cpu_map = CPU_MASK_NONE;
-static struct dev_pm_qos_request *msm_audio_req = NULL;
-
-static void msm_audio_add_qos_request()
-{
-	int i;
-	int cpu = 0;
-
-	msm_audio_req = kzalloc(sizeof(struct dev_pm_qos_request) * NR_CPUS,
-				 GFP_KERNEL);
-	if (!msm_audio_req) {
-		pr_err("%s failed to alloc mem for qos req.\n", __func__);
-		return;
-	}
-
-	for (i = 0; i < ARRAY_SIZE(audio_core_list); i++) {
-		if (audio_core_list[i] >= NR_CPUS)
-			pr_err("%s incorrect cpu id: %d specified.\n", __func__, audio_core_list[i]);
-		else
-			cpumask_set_cpu(audio_core_list[i], &audio_cpu_map);
-	}
-
-	for_each_cpu(cpu, &audio_cpu_map) {
-		dev_pm_qos_add_request(get_cpu_device(cpu),
-			&msm_audio_req[cpu],
-			DEV_PM_QOS_RESUME_LATENCY,
-			PM_QOS_CPU_LATENCY_DEFAULT_VALUE);
-		pr_debug("%s set cpu affinity to core %d.\n", __func__, cpu);
-	}
-}
-
-static void msm_audio_remove_qos_request()
-{
-	int cpu = 0;
-
-	if (msm_audio_req) {
-		for_each_cpu(cpu, &audio_cpu_map) {
-			dev_pm_qos_remove_request(
-				&msm_audio_req[cpu]);
-			pr_debug("%s remove cpu affinity of core %d.\n", __func__, cpu);
-		}
-		kfree(msm_audio_req);
-	}
-}
-
 static bool msm_usbc_swap_gnd_mic(struct snd_soc_component *component, bool active)
 {
 	struct snd_soc_card *card = component->card;
@@ -1919,9 +1869,6 @@ static int msm_asoc_machine_probe(struct platform_device *pdev)
 
 	is_initial_boot = true;
 
-	/* Add QoS request for audio tasks */
-	msm_audio_add_qos_request();
-
 	/* change card status to ONLINE */
 	dev_dbg(&pdev->dev, "%s: setting snd_card to ONLINE\n", __func__);
 	snd_card_set_card_status(SND_CARD_STATUS_ONLINE);
@@ -1947,7 +1894,6 @@ static int msm_asoc_machine_remove(struct platform_device *pdev)
 	msm_common_snd_deinit(common_pdata);
 	snd_event_master_deregister(&pdev->dev);
 	snd_soc_unregister_card(card);
-	msm_audio_remove_qos_request();
 
 	return 0;
 }

asoc/msm_common.c

@@ -1,13 +1,7 @@
-/* Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
+// SPDX-License-Identifier: GPL-2.0-only
- *
+/*
- * This program is free software; you can redistribute it and/or modify
+ * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
- * it under the terms of the GNU General Public License version 2 and
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
- * only version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
  */
 
 #include <linux/gpio.h>
@@ -79,6 +73,16 @@ struct chmap_pdata {
 
 #define MAX_USR_INPUT 10
 
+static int qos_vote_status;
+static struct dev_pm_qos_request latency_pm_qos_req; /* pm_qos request */
+static unsigned int qos_client_active_cnt;
+/* set audio task affinity to core 1 & 2 */
+static const unsigned int audio_core_list[] = {1, 2};
+static cpumask_t audio_cpu_map = CPU_MASK_NONE;
+static struct dev_pm_qos_request *msm_audio_req = NULL;
+static bool kregister_pm_qos_latency_controls = false;
+#define MSM_LL_QOS_VALUE	300 /* time in us to ensure LPM doesn't go in C3/C4 */
+
 static ssize_t aud_dev_sysfs_store(struct kobject *kobj,
 		struct attribute *attr,
 		const char *buf, size_t count)
@@ -594,6 +598,55 @@ void msm_common_snd_shutdown(struct snd_pcm_substream *substream)
 	}
 }
 
+static void msm_audio_add_qos_request()
+{
+	int i;
+	int cpu = 0;
+	int ret = 0;
+
+	msm_audio_req = kcalloc(num_possible_cpus(),
+			sizeof(struct dev_pm_qos_request), GFP_KERNEL);
+	if (!msm_audio_req)
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(audio_core_list); i++) {
+		if (audio_core_list[i] >= num_possible_cpus())
+			pr_err("%s incorrect cpu id: %d specified.\n",
+                                    __func__, audio_core_list[i]);
+		else
+			cpumask_set_cpu(audio_core_list[i], &audio_cpu_map);
+	}
+
+	for_each_cpu(cpu, &audio_cpu_map) {
+		ret = dev_pm_qos_add_request(get_cpu_device(cpu),
+			    &msm_audio_req[cpu],
+			    DEV_PM_QOS_RESUME_LATENCY,
+			    PM_QOS_CPU_LATENCY_DEFAULT_VALUE);
+		if (ret < 0)
+			pr_err("%s error (%d) adding resume latency to cpu %d.\n",
+                                                __func__, ret, cpu);
+		pr_debug("%s set cpu affinity to core %d.\n", __func__, cpu);
+	}
+}
+
+static void msm_audio_remove_qos_request()
+{
+	int cpu = 0;
+	int ret = 0;
+
+	if (msm_audio_req) {
+		for_each_cpu(cpu, &audio_cpu_map) {
+			ret = dev_pm_qos_remove_request(
+				    &msm_audio_req[cpu]);
+			if (ret < 0)
+				pr_err("%s error (%d) removing request from cpu %d.\n",
+                                                __func__, ret, cpu);
+			pr_debug("%s remove cpu affinity of core %d.\n", __func__, cpu);
+		}
+		kfree(msm_audio_req);
+	}
+}
+
 int msm_common_snd_init(struct platform_device *pdev, struct snd_soc_card *card)
 {
 	struct msm_common_pdata *common_pdata = NULL;
@@ -699,6 +752,10 @@ int msm_common_snd_init(struct platform_device *pdev, struct snd_soc_card *card)
 	aud_dev_sysfs_init(common_pdata);
 
 	msm_common_set_pdata(card, common_pdata);
+
+	/* Add QoS request for audio tasks */
+	msm_audio_add_qos_request();
+
 	return 0;
 };
 
@@ -709,6 +766,8 @@ void msm_common_snd_deinit(struct msm_common_pdata *common_pdata)
 	if (!common_pdata)
 		return;
 
+	msm_audio_remove_qos_request();
+
 	for (count = 0; count < MI2S_TDM_AUXPCM_MAX; count++) {
 		mutex_destroy(&common_pdata->lock[count]);
 	}
@@ -854,6 +913,88 @@ void msm_common_get_backend_name(const char *stream_name, char **backend_name)
 	strlcpy(*backend_name, arg, ARRAY_SZ);
 }
 
+static void msm_audio_update_qos_request(u32 latency)
+{
+	int cpu = 0;
+	int ret = -1;
+
+	if (msm_audio_req) {
+		for_each_cpu(cpu, &audio_cpu_map) {
+			ret = dev_pm_qos_update_request(
+					&msm_audio_req[cpu], latency);
+			if (1 == ret ) {
+				pr_debug("%s: updated latency of core %d to %u.\n",
+								__func__, cpu, latency);
+			} else if (0 == ret) {
+				pr_debug("%s: latency of core %d not changed. latency %u.\n",
+								__func__, cpu, latency);
+			} else {
+				pr_err("%s: failed to update latency of core %d, error %d \n",
+								__func__, cpu, ret);
+			}
+		}
+	}
+}
+
+static int msm_qos_ctl_put(struct snd_kcontrol *kcontrol,
+		struct snd_ctl_elem_value *ucontrol)
+{
+	qos_vote_status = ucontrol->value.enumerated.item[0];
+	if (qos_vote_status) {
+		if (dev_pm_qos_request_active(&latency_pm_qos_req))
+			dev_pm_qos_remove_request(&latency_pm_qos_req);
+
+		qos_client_active_cnt++;
+		if (qos_client_active_cnt == 1)
+			msm_audio_update_qos_request(MSM_LL_QOS_VALUE);
+	} else {
+		if (qos_client_active_cnt > 0)
+			qos_client_active_cnt--;
+		if (qos_client_active_cnt == 0)
+			msm_audio_update_qos_request(PM_QOS_CPU_LATENCY_DEFAULT_VALUE);
+	}
+
+	return 0;
+}
+
+static int msm_qos_ctl_get(struct snd_kcontrol *kcontrol,
+		struct snd_ctl_elem_value *ucontrol)
+{
+	ucontrol->value.enumerated.item[0] = qos_vote_status;
+	return 0;
+}
+
+static const char *const qos_text[] = {"Disable", "Enable"};
+
+static SOC_ENUM_SINGLE_EXT_DECL(qos_vote, qos_text);
+
+static const struct snd_kcontrol_new card_pm_qos_controls[] = {
+	SOC_ENUM_EXT("PM_QOS Vote", qos_vote,
+			msm_qos_ctl_get, msm_qos_ctl_put),
+};
+
+static int msm_register_pm_qos_latency_controls(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_component *lpass_cdc_component = NULL;
+	int ret = 0;
+
+	lpass_cdc_component = snd_soc_rtdcom_lookup(rtd, "lpass-cdc");
+	if (!lpass_cdc_component) {
+		pr_err("%s: could not find component for lpass-cdc\n",
+				__func__);
+		return -EINVAL;
+	}
+
+	ret = snd_soc_add_component_controls(lpass_cdc_component,
+			card_pm_qos_controls, ARRAY_SIZE(card_pm_qos_controls));
+	if (ret < 0) {
+		pr_err("%s: add common snd controls failed: %d\n",
+				__func__, ret);
+		return -EINVAL;
+	}
+	return 0;
+}
+
 int msm_common_dai_link_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
@@ -933,9 +1074,20 @@ int msm_common_dai_link_init(struct snd_soc_pcm_runtime *rtd)
 			}
 		}
 		kctl->private_data = pdata;
+	}
+	if (!kregister_pm_qos_latency_controls) {
+		if (!msm_register_pm_qos_latency_controls(rtd))
+			kregister_pm_qos_latency_controls = true;
+	}
+
 free_mixer_str:
+	if (backend_name) {
 		kfree(backend_name);
+		backend_name = NULL;
+	}
+	if (mixer_str) {
 		kfree(mixer_str);
+		mixer_str = NULL;
 	}
 
 	return ret;

asoc/waipio.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2016-2021, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/clk.h>
@@ -50,9 +51,6 @@
 #define DEV_NAME_STR_LEN            32
 #define WCD_MBHC_HS_V_MAX           1600
 
-#define MSM_LL_QOS_VALUE	300 /* time in us to ensure LPM doesn't go in C3/C4 */
-
-
 #define WCN_CDC_SLIM_RX_CH_MAX 2
 #define WCN_CDC_SLIM_TX_CH_MAX 2
 #define WCN_CDC_SLIM_TX_CH_MAX_LITO 3
@@ -120,53 +118,6 @@ static struct wcd_mbhc_config wcd_mbhc_cfg = {
 	.moisture_duty_cycle_en = true,
 };
 
-/* set audio task affinity to core 1 & 2 */
-static const unsigned int audio_core_list[] = {1, 2};
-static cpumask_t audio_cpu_map = CPU_MASK_NONE;
-static struct dev_pm_qos_request *msm_audio_req = NULL;
-
-static void msm_audio_add_qos_request()
-{
-	int i;
-	int cpu = 0;
-
-	msm_audio_req = kzalloc(sizeof(struct dev_pm_qos_request) * NR_CPUS,
-				 GFP_KERNEL);
-	if (!msm_audio_req) {
-		pr_err("%s failed to alloc mem for qos req.\n", __func__);
-		return;
-	}
-
-	for (i = 0; i < ARRAY_SIZE(audio_core_list); i++) {
-		if (audio_core_list[i] >= NR_CPUS)
-			pr_err("%s incorrect cpu id: %d specified.\n", __func__, audio_core_list[i]);
-		else
-			cpumask_set_cpu(audio_core_list[i], &audio_cpu_map);
-	}
-
-	for_each_cpu(cpu, &audio_cpu_map) {
-		dev_pm_qos_add_request(get_cpu_device(cpu),
-			&msm_audio_req[cpu],
-			DEV_PM_QOS_RESUME_LATENCY,
-			PM_QOS_CPU_LATENCY_DEFAULT_VALUE);
-		pr_debug("%s set cpu affinity to core %d.\n", __func__, cpu);
-	}
-}
-
-static void msm_audio_remove_qos_request()
-{
-	int cpu = 0;
-
-	if (msm_audio_req) {
-		for_each_cpu(cpu, &audio_cpu_map) {
-			dev_pm_qos_remove_request(
-				&msm_audio_req[cpu]);
-			pr_debug("%s remove cpu affinity of core %d.\n", __func__, cpu);
-		}
-		kfree(msm_audio_req);
-	}
-}
-
 static bool msm_usbc_swap_gnd_mic(struct snd_soc_component *component, bool active)
 {
 	struct snd_soc_card *card = component->card;
@@ -1891,9 +1842,6 @@ static int msm_asoc_machine_probe(struct platform_device *pdev)
 
 	is_initial_boot = true;
 
-	/* Add QoS request for audio tasks */
-	msm_audio_add_qos_request();
-
 	/* change card status to ONLINE */
 	dev_dbg(&pdev->dev, "%s: setting snd_card to ONLINE\n", __func__);
 	snd_card_set_card_status(SND_CARD_STATUS_ONLINE);
@@ -1919,7 +1867,6 @@ static int msm_asoc_machine_remove(struct platform_device *pdev)
 	msm_common_snd_deinit(common_pdata);
 	snd_event_master_deregister(&pdev->dev);
 	snd_soc_unregister_card(card);
-	msm_audio_remove_qos_request();
 
 	return 0;
 }