Message-Id: <20240812062919.78-3-jackson.lee@chipsnmedia.com>
Date: Mon, 12 Aug 2024 15:29:17 +0900
From: "Jackson.lee" <jackson.lee@...psnmedia.com>
To: mchehab@...nel.org,
	nicolas@...fresne.ca,
	sebastian.fricke@...labora.com
Cc: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	hverkuil@...all.nl,
	nas.chung@...psnmedia.com,
	lafley.kim@...psnmedia.com,
	b-brnich@...com,
	jackson.lee@...psnmedia.com,
	Nicolas Dufresne <nicolas.dufresne@...labora.com>
Subject: [PATCH v7 2/4] media: chips-media: wave5: Support runtime suspend/resume

Add support for runtime suspend/resume in the encoder and decoder. This is
achieved by saving the VPU state and powering it off while the VPU idle.

Signed-off-by: Jackson.lee <jackson.lee@...psnmedia.com>
Signed-off-by: Nas Chung <nas.chung@...psnmedia.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
---
 .../platform/chips-media/wave5/wave5-helper.c | 13 -----
 .../platform/chips-media/wave5/wave5-hw.c     |  4 +-
 .../chips-media/wave5/wave5-vpu-dec.c         | 21 ++++++--
 .../chips-media/wave5/wave5-vpu-enc.c         | 20 ++++++--
 .../platform/chips-media/wave5/wave5-vpu.c    | 50 +++++++++++++++++++
 .../platform/chips-media/wave5/wave5-vpuapi.c | 33 ++++++++++--
 .../media/platform/chips-media/wave5/wave5.h  |  3 ++
 7 files changed, 118 insertions(+), 26 deletions(-)

diff --git a/drivers/media/platform/chips-media/wave5/wave5-helper.c b/drivers/media/platform/chips-media/wave5/wave5-helper.c
index d60841c54a80..a20d84dbe3aa 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-helper.c
+++ b/drivers/media/platform/chips-media/wave5/wave5-helper.c
@@ -58,7 +58,6 @@ int wave5_vpu_release_device(struct file *filp,
 			     char *name)
 {
 	struct vpu_instance *inst = wave5_to_vpu_inst(filp->private_data);
-	struct vpu_device *dev = inst->dev;
 	int ret = 0;
 
 	v4l2_m2m_ctx_release(inst->v4l2_fh.m2m_ctx);
@@ -78,18 +77,6 @@ int wave5_vpu_release_device(struct file *filp,
 	}
 
 	wave5_cleanup_instance(inst);
-	if (dev->irq < 0) {
-		ret = mutex_lock_interruptible(&dev->dev_lock);
-		if (ret)
-			return ret;
-
-		if (list_empty(&dev->instances)) {
-			dev_dbg(dev->dev, "Disabling the hrtimer\n");
-			hrtimer_cancel(&dev->hrtimer);
-		}
-
-		mutex_unlock(&dev->dev_lock);
-	}
 
 	return ret;
 }
diff --git a/drivers/media/platform/chips-media/wave5/wave5-hw.c b/drivers/media/platform/chips-media/wave5/wave5-hw.c
index 2a98bab446d0..c8a905994109 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-hw.c
+++ b/drivers/media/platform/chips-media/wave5/wave5-hw.c
@@ -1228,8 +1228,8 @@ int wave5_vpu_re_init(struct device *dev, u8 *fw, size_t size)
 	return setup_wave5_properties(dev);
 }
 
-static int wave5_vpu_sleep_wake(struct device *dev, bool i_sleep_wake, const uint16_t *code,
-				size_t size)
+int wave5_vpu_sleep_wake(struct device *dev, bool i_sleep_wake, const uint16_t *code,
+			 size_t size)
 {
 	u32 reg_val;
 	struct vpu_buf *common_vb;
diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c b/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
index 0c5c9a8de91f..698c83e3082e 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
+++ b/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
@@ -5,6 +5,7 @@
  * Copyright (C) 2021-2023 CHIPS&MEDIA INC
  */
 
+#include <linux/pm_runtime.h>
 #include "wave5-helper.h"
 
 #define VPU_DEC_DEV_NAME "C&M Wave5 VPU decoder"
@@ -518,6 +519,8 @@ static void wave5_vpu_dec_finish_decode(struct vpu_instance *inst)
 	if (q_status.report_queue_count == 0 &&
 	    (q_status.instance_queue_count == 0 || dec_info.sequence_changed)) {
 		dev_dbg(inst->dev->dev, "%s: finishing job.\n", __func__);
+		pm_runtime_mark_last_busy(inst->dev->dev);
+		pm_runtime_put_autosuspend(inst->dev->dev);
 		v4l2_m2m_job_finish(inst->v4l2_m2m_dev, m2m_ctx);
 	}
 }
@@ -1398,6 +1401,7 @@ static int wave5_vpu_dec_start_streaming(struct vb2_queue *q, unsigned int count
 	int ret = 0;
 
 	dev_dbg(inst->dev->dev, "%s: type: %u\n", __func__, q->type);
+	pm_runtime_resume_and_get(inst->dev->dev);
 
 	v4l2_m2m_update_start_streaming_state(m2m_ctx, q);
 
@@ -1429,13 +1433,15 @@ static int wave5_vpu_dec_start_streaming(struct vb2_queue *q, unsigned int count
 		if (ret)
 			goto return_buffers;
 	}
-
+	pm_runtime_mark_last_busy(inst->dev->dev);
+	pm_runtime_put_autosuspend(inst->dev->dev);
 	return ret;
 
 free_bitstream_vbuf:
 	wave5_vdi_free_dma_memory(inst->dev, &inst->bitstream_vbuf);
 return_buffers:
 	wave5_return_bufs(q, VB2_BUF_STATE_QUEUED);
+	pm_runtime_put_autosuspend(inst->dev->dev);
 	return ret;
 }
 
@@ -1521,6 +1527,7 @@ static void wave5_vpu_dec_stop_streaming(struct vb2_queue *q)
 	bool check_cmd = TRUE;
 
 	dev_dbg(inst->dev->dev, "%s: type: %u\n", __func__, q->type);
+	pm_runtime_resume_and_get(inst->dev->dev);
 
 	while (check_cmd) {
 		struct queue_status_info q_status;
@@ -1544,6 +1551,9 @@ static void wave5_vpu_dec_stop_streaming(struct vb2_queue *q)
 		streamoff_output(q);
 	else
 		streamoff_capture(q);
+
+	pm_runtime_mark_last_busy(inst->dev->dev);
+	pm_runtime_put_autosuspend(inst->dev->dev);
 }
 
 static const struct vb2_ops wave5_vpu_dec_vb2_ops = {
@@ -1630,7 +1640,7 @@ static void wave5_vpu_dec_device_run(void *priv)
 	int ret = 0;
 
 	dev_dbg(inst->dev->dev, "%s: Fill the ring buffer with new bitstream data", __func__);
-
+	pm_runtime_resume_and_get(inst->dev->dev);
 	ret = fill_ringbuffer(inst);
 	if (ret) {
 		dev_warn(inst->dev->dev, "Filling ring buffer failed\n");
@@ -1713,6 +1723,8 @@ static void wave5_vpu_dec_device_run(void *priv)
 
 finish_job_and_return:
 	dev_dbg(inst->dev->dev, "%s: leave and finish job", __func__);
+	pm_runtime_mark_last_busy(inst->dev->dev);
+	pm_runtime_put_autosuspend(inst->dev->dev);
 	v4l2_m2m_job_finish(inst->v4l2_m2m_dev, m2m_ctx);
 }
 
@@ -1879,9 +1891,8 @@ static int wave5_vpu_open_dec(struct file *filp)
 	if (ret)
 		goto cleanup_inst;
 
-	if (dev->irq < 0 && !hrtimer_active(&dev->hrtimer) && list_empty(&dev->instances))
-		hrtimer_start(&dev->hrtimer, ns_to_ktime(dev->vpu_poll_interval * NSEC_PER_MSEC),
-			      HRTIMER_MODE_REL_PINNED);
+	if (list_empty(&dev->instances))
+		pm_runtime_use_autosuspend(inst->dev->dev);
 
 	list_add_tail(&inst->list, &dev->instances);
 
diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c b/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
index b731decbfda6..985de0c293e2 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
+++ b/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
@@ -5,6 +5,7 @@
  * Copyright (C) 2021-2023 CHIPS&MEDIA INC
  */
 
+#include <linux/pm_runtime.h>
 #include "wave5-helper.h"
 
 #define VPU_ENC_DEV_NAME "C&M Wave5 VPU encoder"
@@ -1310,6 +1311,7 @@ static int wave5_vpu_enc_start_streaming(struct vb2_queue *q, unsigned int count
 	struct v4l2_m2m_ctx *m2m_ctx = inst->v4l2_fh.m2m_ctx;
 	int ret = 0;
 
+	pm_runtime_resume_and_get(inst->dev->dev);
 	v4l2_m2m_update_start_streaming_state(m2m_ctx, q);
 
 	if (inst->state == VPU_INST_STATE_NONE && q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
@@ -1364,9 +1366,13 @@ static int wave5_vpu_enc_start_streaming(struct vb2_queue *q, unsigned int count
 	if (ret)
 		goto return_buffers;
 
+	pm_runtime_mark_last_busy(inst->dev->dev);
+	pm_runtime_put_autosuspend(inst->dev->dev);
 	return 0;
 return_buffers:
 	wave5_return_bufs(q, VB2_BUF_STATE_QUEUED);
+	pm_runtime_mark_last_busy(inst->dev->dev);
+	pm_runtime_put_autosuspend(inst->dev->dev);
 	return ret;
 }
 
@@ -1408,6 +1414,7 @@ static void wave5_vpu_enc_stop_streaming(struct vb2_queue *q)
 	 */
 
 	dev_dbg(inst->dev->dev, "%s: type: %u\n", __func__, q->type);
+	pm_runtime_resume_and_get(inst->dev->dev);
 
 	if (wave5_vpu_both_queues_are_streaming(inst))
 		switch_state(inst, VPU_INST_STATE_STOP);
@@ -1432,6 +1439,9 @@ static void wave5_vpu_enc_stop_streaming(struct vb2_queue *q)
 		streamoff_output(inst, q);
 	else
 		streamoff_capture(inst, q);
+
+	pm_runtime_mark_last_busy(inst->dev->dev);
+	pm_runtime_put_autosuspend(inst->dev->dev);
 }
 
 static const struct vb2_ops wave5_vpu_enc_vb2_ops = {
@@ -1478,6 +1488,7 @@ static void wave5_vpu_enc_device_run(void *priv)
 	u32 fail_res = 0;
 	int ret = 0;
 
+	pm_runtime_resume_and_get(inst->dev->dev);
 	switch (inst->state) {
 	case VPU_INST_STATE_PIC_RUN:
 		ret = start_encode(inst, &fail_res);
@@ -1491,6 +1502,8 @@ static void wave5_vpu_enc_device_run(void *priv)
 			break;
 		}
 		dev_dbg(inst->dev->dev, "%s: leave with active job", __func__);
+		pm_runtime_mark_last_busy(inst->dev->dev);
+		pm_runtime_put_autosuspend(inst->dev->dev);
 		return;
 	default:
 		WARN(1, "Execution of a job in state %s is invalid.\n",
@@ -1498,6 +1511,8 @@ static void wave5_vpu_enc_device_run(void *priv)
 		break;
 	}
 	dev_dbg(inst->dev->dev, "%s: leave and finish job", __func__);
+	pm_runtime_mark_last_busy(inst->dev->dev);
+	pm_runtime_put_autosuspend(inst->dev->dev);
 	v4l2_m2m_job_finish(inst->v4l2_m2m_dev, m2m_ctx);
 }
 
@@ -1739,9 +1754,8 @@ static int wave5_vpu_open_enc(struct file *filp)
 	if (ret)
 		goto cleanup_inst;
 
-	if (dev->irq < 0 && !hrtimer_active(&dev->hrtimer) && list_empty(&dev->instances))
-		hrtimer_start(&dev->hrtimer, ns_to_ktime(dev->vpu_poll_interval * NSEC_PER_MSEC),
-			      HRTIMER_MODE_REL_PINNED);
+	if (list_empty(&dev->instances))
+		pm_runtime_use_autosuspend(inst->dev->dev);
 
 	list_add_tail(&inst->list, &dev->instances);
 
diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu.c b/drivers/media/platform/chips-media/wave5/wave5-vpu.c
index 7273254ecb03..41c4bf64f27d 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-vpu.c
+++ b/drivers/media/platform/chips-media/wave5/wave5-vpu.c
@@ -10,6 +10,7 @@
 #include <linux/clk.h>
 #include <linux/firmware.h>
 #include <linux/interrupt.h>
+#include <linux/pm_runtime.h>
 #include <linux/reset.h>
 #include "wave5-vpu.h"
 #include "wave5-regdefine.h"
@@ -153,6 +154,45 @@ static int wave5_vpu_load_firmware(struct device *dev, const char *fw_name,
 	return 0;
 }
 
+static __maybe_unused int wave5_pm_suspend(struct device *dev)
+{
+	struct vpu_device *vpu = dev_get_drvdata(dev);
+
+	if (pm_runtime_suspended(dev))
+		return 0;
+
+	if (vpu->irq < 0)
+		hrtimer_cancel(&vpu->hrtimer);
+
+	wave5_vpu_sleep_wake(dev, true, NULL, 0);
+	clk_bulk_disable_unprepare(vpu->num_clks, vpu->clks);
+
+	return 0;
+}
+
+static __maybe_unused int wave5_pm_resume(struct device *dev)
+{
+	struct vpu_device *vpu = dev_get_drvdata(dev);
+	int ret = 0;
+
+	wave5_vpu_sleep_wake(dev, false, NULL, 0);
+	ret = clk_bulk_prepare_enable(vpu->num_clks, vpu->clks);
+	if (ret) {
+		dev_err(dev, "Enabling clocks, fail: %d\n", ret);
+		return ret;
+	}
+
+	if (vpu->irq < 0 && !hrtimer_active(&vpu->hrtimer))
+		hrtimer_start(&vpu->hrtimer, ns_to_ktime(vpu->vpu_poll_interval * NSEC_PER_MSEC),
+				HRTIMER_MODE_REL_PINNED);
+
+	return ret;
+}
+
+static const struct dev_pm_ops wave5_pm_ops = {
+	SET_RUNTIME_PM_OPS(wave5_pm_suspend, wave5_pm_resume, NULL)
+};
+
 static int wave5_vpu_probe(struct platform_device *pdev)
 {
 	int ret;
@@ -281,6 +321,12 @@ static int wave5_vpu_probe(struct platform_device *pdev)
 		 (match_data->flags & WAVE5_IS_DEC) ? "'DECODE'" : "");
 	dev_info(&pdev->dev, "Product Code:      0x%x\n", dev->product_code);
 	dev_info(&pdev->dev, "Firmware Revision: %u\n", fw_revision);
+
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 100);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	wave5_vpu_sleep_wake(&pdev->dev, true, NULL, 0);
+
 	return 0;
 
 err_enc_unreg:
@@ -310,6 +356,9 @@ static void wave5_vpu_remove(struct platform_device *pdev)
 		hrtimer_cancel(&dev->hrtimer);
 	}
 
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
 	mutex_destroy(&dev->dev_lock);
 	mutex_destroy(&dev->hw_lock);
 	reset_control_assert(dev->resets);
@@ -337,6 +386,7 @@ static struct platform_driver wave5_vpu_driver = {
 	.driver = {
 		.name = VPU_PLATFORM_DEVICE_NAME,
 		.of_match_table = of_match_ptr(wave5_dt_ids),
+		.pm = &wave5_pm_ops,
 		},
 	.probe = wave5_vpu_probe,
 	.remove_new = wave5_vpu_remove,
diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpuapi.c b/drivers/media/platform/chips-media/wave5/wave5-vpuapi.c
index 1a3efb638dde..e16b990041c2 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-vpuapi.c
+++ b/drivers/media/platform/chips-media/wave5/wave5-vpuapi.c
@@ -6,6 +6,8 @@
  */
 
 #include <linux/bug.h>
+#include <linux/pm_runtime.h>
+#include <linux/delay.h>
 #include "wave5-vpuapi.h"
 #include "wave5-regdefine.h"
 #include "wave5.h"
@@ -195,14 +197,20 @@ int wave5_vpu_dec_close(struct vpu_instance *inst, u32 *fail_res)
 	int retry = 0;
 	struct vpu_device *vpu_dev = inst->dev;
 	int i;
+	int inst_count = 0;
+	struct vpu_instance *inst_elm;
 
 	*fail_res = 0;
 	if (!inst->codec_info)
 		return -EINVAL;
 
+	pm_runtime_resume_and_get(inst->dev->dev);
+
 	ret = mutex_lock_interruptible(&vpu_dev->hw_lock);
-	if (ret)
+	if (ret) {
+		pm_runtime_put_sync(inst->dev->dev);
 		return ret;
+	}
 
 	do {
 		ret = wave5_vpu_dec_finish_seq(inst, fail_res);
@@ -232,9 +240,14 @@ int wave5_vpu_dec_close(struct vpu_instance *inst, u32 *fail_res)
 
 	wave5_vdi_free_dma_memory(vpu_dev, &p_dec_info->vb_task);
 
+	list_for_each_entry(inst_elm, &vpu_dev->instances, list)
+		inst_count++;
+	if (inst_count == 1)
+		pm_runtime_dont_use_autosuspend(vpu_dev->dev);
+
 unlock_and_return:
 	mutex_unlock(&vpu_dev->hw_lock);
-
+	pm_runtime_put_sync(inst->dev->dev);
 	return ret;
 }
 
@@ -697,25 +710,33 @@ int wave5_vpu_enc_close(struct vpu_instance *inst, u32 *fail_res)
 	int ret;
 	int retry = 0;
 	struct vpu_device *vpu_dev = inst->dev;
+	int inst_count = 0;
+	struct vpu_instance *inst_elm;
 
 	*fail_res = 0;
 	if (!inst->codec_info)
 		return -EINVAL;
 
+	pm_runtime_resume_and_get(inst->dev->dev);
+
 	ret = mutex_lock_interruptible(&vpu_dev->hw_lock);
-	if (ret)
+	if (ret) {
+		pm_runtime_resume_and_get(inst->dev->dev);
 		return ret;
+	}
 
 	do {
 		ret = wave5_vpu_enc_finish_seq(inst, fail_res);
 		if (ret < 0 && *fail_res != WAVE5_SYSERR_VPU_STILL_RUNNING) {
 			dev_warn(inst->dev->dev, "enc_finish_seq timed out\n");
+			pm_runtime_resume_and_get(inst->dev->dev);
 			mutex_unlock(&vpu_dev->hw_lock);
 			return ret;
 		}
 
 		if (*fail_res == WAVE5_SYSERR_VPU_STILL_RUNNING &&
 		    retry++ >= MAX_FIRMWARE_CALL_RETRY) {
+			pm_runtime_resume_and_get(inst->dev->dev);
 			mutex_unlock(&vpu_dev->hw_lock);
 			return -ETIMEDOUT;
 		}
@@ -734,7 +755,13 @@ int wave5_vpu_enc_close(struct vpu_instance *inst, u32 *fail_res)
 
 	wave5_vdi_free_dma_memory(vpu_dev, &p_enc_info->vb_task);
 
+	list_for_each_entry(inst_elm, &vpu_dev->instances, list)
+		inst_count++;
+	if (inst_count == 1)
+		pm_runtime_dont_use_autosuspend(vpu_dev->dev);
+
 	mutex_unlock(&vpu_dev->hw_lock);
+	pm_runtime_put_sync(inst->dev->dev);
 
 	return 0;
 }
diff --git a/drivers/media/platform/chips-media/wave5/wave5.h b/drivers/media/platform/chips-media/wave5/wave5.h
index 2a29b9164f97..2caab356f3e1 100644
--- a/drivers/media/platform/chips-media/wave5/wave5.h
+++ b/drivers/media/platform/chips-media/wave5/wave5.h
@@ -62,6 +62,9 @@ int wave5_vpu_get_version(struct vpu_device *vpu_dev, u32 *revision);
 
 int wave5_vpu_init(struct device *dev, u8 *fw, size_t size);
 
+int wave5_vpu_sleep_wake(struct device *dev, bool i_sleep_wake, const uint16_t *code,
+			 size_t size);
+
 int wave5_vpu_reset(struct device *dev, enum sw_reset_mode reset_mode);
 
 int wave5_vpu_build_up_dec_param(struct vpu_instance *inst, struct dec_open_param *param);
-- 
2.43.0

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