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Message-ID: <777c81510ea6fbaee4aa6b32595d5386523261a4.camel@ndufresne.ca>
Date: Fri, 06 Sep 2024 13:08:15 -0400
From: Nicolas Dufresne <nicolas@...fresne.ca>
To: "Jackson.lee" <jackson.lee@...psnmedia.com>, mchehab@...nel.org, 
	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
Subject: Re: [RESEND PATCH v7 2/4] media: chips-media: wave5: Support
 runtime suspend/resume

Hi,

Le lundi 12 août 2024 à 16:08 +0900, Jackson.lee a écrit :
> 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.

If you don't, I'll edit to "while the VPU *is* idle".

regards,
Nicolas

> 
> 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);


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