[alsa-devel] [PATCH 0/4] ASoC: SOF: Intel: only use D0i3 if needed

[alsa-devel] [PATCH 0/4] ASoC: SOF: Intel: only use D0i3 if needed

[Pierre-Louis Bossart]

The earlier patches for D0i3/S0ix support went one bridge too far, and
forced the use of D0i3 even when it was not needed, which also had the
side effect of breaking some of our s2idle suspend/resume stress
tests.

Add documentation on supported transitions and only use D0i3 if
necessary.

Keyon Jie (4):
  ASoC: SOF: PM: add state machine to comments
  ASoC: SOF: PM: add check before setting d0_substate
  ASoC: SOF: add helper to check if we should enter d0i3 suspend
  ASoC: SOF: PM: only suspend to D0I3 when needed

 sound/soc/sof/core.c     | 13 +++++++++++++
 sound/soc/sof/pm.c       | 39 +++++++++++++++++++++++++++++++++++++--
 sound/soc/sof/sof-priv.h |  2 ++
 3 files changed, 52 insertions(+), 2 deletions(-)

-- 
2.20.1

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[alsa-devel] [PATCH 1/4] ASoC: SOF: PM: add state machine to comments

[Pierre-Louis Bossart]

From: Keyon Jie <yang.jie@linux.intel.com>

Add Audio DSP state machine with comments. Note that the
'D0<-->runtime D0I3' part is not implemented yet.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/soc/sof/pm.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c
index 560a937e0484..3204c92f0e7d 100644
--- a/sound/soc/sof/pm.c
+++ b/sound/soc/sof/pm.c
@@ -428,6 +428,38 @@ int snd_sof_set_d0_substate(struct snd_sof_dev *sdev,
 }
 EXPORT_SYMBOL(snd_sof_set_d0_substate);
 
+/*
+ * Audio DSP states may transform as below:-
+ *
+ *                                         D0I3 compatible stream
+ *     Runtime    +---------------------+   opened only, timeout
+ *     suspend    |                     +--------------------+
+ *   +------------+       D0(active)    |                    |
+ *   |            |                     <---------------+    |
+ *   |   +-------->                     |               |    |
+ *   |   |Runtime +--^--+---------^--+--+ The last      |    |
+ *   |   |resume     |  |         |  |    opened D0I3   |    |
+ *   |   |           |  |         |  |    compatible    |    |
+ *   |   |     resume|  |         |  |    stream closed |    |
+ *   |   |      from |  | D3      |  |                  |    |
+ *   |   |       D3  |  |suspend  |  | d0i3             |    |
+ *   |   |           |  |         |  |suspend           |    |
+ *   |   |           |  |         |  |                  |    |
+ *   |   |           |  |         |  |                  |    |
+ * +-v---+-----------+--v-------+ |  |           +------+----v----+
+ * |                            | |  +----------->                |
+ * |       D3 (suspended)       | |              |      D0I3      +-----+
+ * |                            | +--------------+                |     |
+ * |                            |  resume from   |                |     |
+ * +-------------------^--------+  d0i3 suspend  +----------------+     |
+ *                     |                                                |
+ *                     |                       D3 suspend               |
+ *                     +------------------------------------------------+
+ *
+ * d0i3_suspend = s0_suspend && D0I3 stream opened,
+ * D3 suspend = !d0i3_suspend,
+ */
+
 int snd_sof_resume(struct device *dev)
 {
 	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
-- 
2.20.1

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[alsa-devel] [PATCH 2/4] ASoC: SOF: PM: add check before setting d0_substate

[Pierre-Louis Bossart]

From: Keyon Jie <yang.jie@linux.intel.com>

Add check before seeting d0_substate and return success if Audio DSP is
already in the target substate.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/soc/sof/pm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c
index 3204c92f0e7d..b89810bf3230 100644
--- a/sound/soc/sof/pm.c
+++ b/sound/soc/sof/pm.c
@@ -416,6 +416,9 @@ int snd_sof_set_d0_substate(struct snd_sof_dev *sdev,
 {
 	int ret;
 
+	if (sdev->d0_substate == d0_substate)
+		return 0;
+
 	/* do platform specific set_state */
 	ret = snd_sof_dsp_set_power_state(sdev, d0_substate);
 	if (ret < 0)
-- 
2.20.1

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[alsa-devel] [PATCH 3/4] ASoC: SOF: add helper to check if we should enter d0i3 suspend

[Pierre-Louis Bossart]

From: Keyon Jie <yang.jie@linux.intel.com>

Add helper to check if the DSP should be put in D0i3. This function
returns true if a stream has ignored the SUSPEND trigger to keep the
pipelines running in the DSP.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/soc/sof/core.c     | 13 +++++++++++++
 sound/soc/sof/sof-priv.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/sound/soc/sof/core.c b/sound/soc/sof/core.c
index 8661c2cca76b..805918d3bcc0 100644
--- a/sound/soc/sof/core.c
+++ b/sound/soc/sof/core.c
@@ -132,6 +132,19 @@ struct snd_sof_dai *snd_sof_find_dai(struct snd_sof_dev *sdev,
 	return NULL;
 }
 
+bool snd_sof_dsp_d0i3_on_suspend(struct snd_sof_dev *sdev)
+{
+	struct snd_sof_pcm *spcm;
+
+	list_for_each_entry(spcm, &sdev->pcm_list, list) {
+		if (spcm->stream[SNDRV_PCM_STREAM_PLAYBACK].suspend_ignored ||
+		    spcm->stream[SNDRV_PCM_STREAM_CAPTURE].suspend_ignored)
+			return true;
+	}
+
+	return false;
+}
+
 /*
  * FW Panic/fault handling.
  */
diff --git a/sound/soc/sof/sof-priv.h b/sound/soc/sof/sof-priv.h
index 6408ac88a3e5..c7c2c70ee4d0 100644
--- a/sound/soc/sof/sof-priv.h
+++ b/sound/soc/sof/sof-priv.h
@@ -553,6 +553,8 @@ struct snd_sof_pcm *snd_sof_find_spcm_dai(struct snd_sof_dev *sdev,
 	return NULL;
 }
 
+bool snd_sof_dsp_d0i3_on_suspend(struct snd_sof_dev *sdev);
+
 struct snd_sof_pcm *snd_sof_find_spcm_name(struct snd_sof_dev *sdev,
 					   const char *name);
 struct snd_sof_pcm *snd_sof_find_spcm_comp(struct snd_sof_dev *sdev,
-- 
2.20.1

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[alsa-devel] [PATCH 4/4] ASoC: SOF: PM: only suspend to D0I3 when needed

[Pierre-Louis Bossart]

From: Keyon Jie <yang.jie@linux.intel.com>

We should suspend audio to D3 by default, for the sake of power saving,
change the condition of D0I3 suspending here to that when there is
stream with suspend_ignored specified.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/soc/sof/pm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c
index b89810bf3230..0fd5567237a8 100644
--- a/sound/soc/sof/pm.c
+++ b/sound/soc/sof/pm.c
@@ -468,7 +468,7 @@ int snd_sof_resume(struct device *dev)
 	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
 	int ret;
 
-	if (sdev->s0_suspend) {
+	if (snd_sof_dsp_d0i3_on_suspend(sdev)) {
 		/* resume from D0I3 */
 		dev_dbg(sdev->dev, "DSP will exit from D0i3...\n");
 		ret = snd_sof_set_d0_substate(sdev, SOF_DSP_D0I0);
@@ -497,7 +497,7 @@ int snd_sof_suspend(struct device *dev)
 	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
 	int ret;
 
-	if (sdev->s0_suspend) {
+	if (snd_sof_dsp_d0i3_on_suspend(sdev)) {
 		/* suspend to D0i3 */
 		dev_dbg(sdev->dev, "DSP is trying to enter D0i3...\n");
 		ret = snd_sof_set_d0_substate(sdev, SOF_DSP_D0I3);
-- 
2.20.1

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[alsa-devel] Applied "ASoC: SOF: PM: only suspend to D0I3 when needed" to the asoc tree

[Mark Brown]

The patch

   ASoC: SOF: PM: only suspend to D0I3 when needed

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.5

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 5e35d5f4224adb24c2bfa814b9fb562050aba3ea Mon Sep 17 00:00:00 2001
From: Keyon Jie <yang.jie@linux.intel.com>
Date: Mon, 11 Nov 2019 16:33:43 -0600
Subject: [PATCH] ASoC: SOF: PM: only suspend to D0I3 when needed

We should suspend audio to D3 by default, for the sake of power saving,
change the condition of D0I3 suspending here to that when there is
stream with suspend_ignored specified.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191111223343.19986-5-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/sof/pm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c
index b89810bf3230..0fd5567237a8 100644
--- a/sound/soc/sof/pm.c
+++ b/sound/soc/sof/pm.c
@@ -468,7 +468,7 @@ int snd_sof_resume(struct device *dev)
 	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
 	int ret;
 
-	if (sdev->s0_suspend) {
+	if (snd_sof_dsp_d0i3_on_suspend(sdev)) {
 		/* resume from D0I3 */
 		dev_dbg(sdev->dev, "DSP will exit from D0i3...\n");
 		ret = snd_sof_set_d0_substate(sdev, SOF_DSP_D0I0);
@@ -497,7 +497,7 @@ int snd_sof_suspend(struct device *dev)
 	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
 	int ret;
 
-	if (sdev->s0_suspend) {
+	if (snd_sof_dsp_d0i3_on_suspend(sdev)) {
 		/* suspend to D0i3 */
 		dev_dbg(sdev->dev, "DSP is trying to enter D0i3...\n");
 		ret = snd_sof_set_d0_substate(sdev, SOF_DSP_D0I3);
-- 
2.20.1

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[alsa-devel] Applied "ASoC: SOF: PM: add state machine to comments" to the asoc tree

[Mark Brown]

The patch

   ASoC: SOF: PM: add state machine to comments

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.5

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 74b4dd04b19cc03e1cc369d9c371cf4206367df4 Mon Sep 17 00:00:00 2001
From: Keyon Jie <yang.jie@linux.intel.com>
Date: Mon, 11 Nov 2019 16:33:40 -0600
Subject: [PATCH] ASoC: SOF: PM: add state machine to comments

Add Audio DSP state machine with comments. Note that the
'D0<-->runtime D0I3' part is not implemented yet.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191111223343.19986-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/sof/pm.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c
index 560a937e0484..3204c92f0e7d 100644
--- a/sound/soc/sof/pm.c
+++ b/sound/soc/sof/pm.c
@@ -428,6 +428,38 @@ int snd_sof_set_d0_substate(struct snd_sof_dev *sdev,
 }
 EXPORT_SYMBOL(snd_sof_set_d0_substate);
 
+/*
+ * Audio DSP states may transform as below:-
+ *
+ *                                         D0I3 compatible stream
+ *     Runtime    +---------------------+   opened only, timeout
+ *     suspend    |                     +--------------------+
+ *   +------------+       D0(active)    |                    |
+ *   |            |                     <---------------+    |
+ *   |   +-------->                     |               |    |
+ *   |   |Runtime +--^--+---------^--+--+ The last      |    |
+ *   |   |resume     |  |         |  |    opened D0I3   |    |
+ *   |   |           |  |         |  |    compatible    |    |
+ *   |   |     resume|  |         |  |    stream closed |    |
+ *   |   |      from |  | D3      |  |                  |    |
+ *   |   |       D3  |  |suspend  |  | d0i3             |    |
+ *   |   |           |  |         |  |suspend           |    |
+ *   |   |           |  |         |  |                  |    |
+ *   |   |           |  |         |  |                  |    |
+ * +-v---+-----------+--v-------+ |  |           +------+----v----+
+ * |                            | |  +----------->                |
+ * |       D3 (suspended)       | |              |      D0I3      +-----+
+ * |                            | +--------------+                |     |
+ * |                            |  resume from   |                |     |
+ * +-------------------^--------+  d0i3 suspend  +----------------+     |
+ *                     |                                                |
+ *                     |                       D3 suspend               |
+ *                     +------------------------------------------------+
+ *
+ * d0i3_suspend = s0_suspend && D0I3 stream opened,
+ * D3 suspend = !d0i3_suspend,
+ */
+
 int snd_sof_resume(struct device *dev)
 {
 	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
-- 
2.20.1

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[alsa-devel] Applied "ASoC: SOF: PM: add check before setting d0_substate" to the asoc tree

[Mark Brown]

The patch

   ASoC: SOF: PM: add check before setting d0_substate

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.5

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 58a972efd21bb5adadd97f2546693ec64bfc99b9 Mon Sep 17 00:00:00 2001
From: Keyon Jie <yang.jie@linux.intel.com>
Date: Mon, 11 Nov 2019 16:33:41 -0600
Subject: [PATCH] ASoC: SOF: PM: add check before setting d0_substate

Add check before seeting d0_substate and return success if Audio DSP is
already in the target substate.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191111223343.19986-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/sof/pm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c
index 3204c92f0e7d..b89810bf3230 100644
--- a/sound/soc/sof/pm.c
+++ b/sound/soc/sof/pm.c
@@ -416,6 +416,9 @@ int snd_sof_set_d0_substate(struct snd_sof_dev *sdev,
 {
 	int ret;
 
+	if (sdev->d0_substate == d0_substate)
+		return 0;
+
 	/* do platform specific set_state */
 	ret = snd_sof_dsp_set_power_state(sdev, d0_substate);
 	if (ret < 0)
-- 
2.20.1

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[alsa-devel] Applied "ASoC: SOF: add helper to check if we should enter d0i3 suspend" to the asoc tree

[Mark Brown]

The patch

   ASoC: SOF: add helper to check if we should enter d0i3 suspend

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.5

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From a77e5d573f847d2f984c38eb711351326bc55258 Mon Sep 17 00:00:00 2001
From: Keyon Jie <yang.jie@linux.intel.com>
Date: Mon, 11 Nov 2019 16:33:42 -0600
Subject: [PATCH] ASoC: SOF: add helper to check if we should enter d0i3
 suspend

Add helper to check if the DSP should be put in D0i3. This function
returns true if a stream has ignored the SUSPEND trigger to keep the
pipelines running in the DSP.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191111223343.19986-4-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/sof/core.c     | 13 +++++++++++++
 sound/soc/sof/sof-priv.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/sound/soc/sof/core.c b/sound/soc/sof/core.c
index 8661c2cca76b..805918d3bcc0 100644
--- a/sound/soc/sof/core.c
+++ b/sound/soc/sof/core.c
@@ -132,6 +132,19 @@ struct snd_sof_dai *snd_sof_find_dai(struct snd_sof_dev *sdev,
 	return NULL;
 }
 
+bool snd_sof_dsp_d0i3_on_suspend(struct snd_sof_dev *sdev)
+{
+	struct snd_sof_pcm *spcm;
+
+	list_for_each_entry(spcm, &sdev->pcm_list, list) {
+		if (spcm->stream[SNDRV_PCM_STREAM_PLAYBACK].suspend_ignored ||
+		    spcm->stream[SNDRV_PCM_STREAM_CAPTURE].suspend_ignored)
+			return true;
+	}
+
+	return false;
+}
+
 /*
  * FW Panic/fault handling.
  */
diff --git a/sound/soc/sof/sof-priv.h b/sound/soc/sof/sof-priv.h
index 6408ac88a3e5..c7c2c70ee4d0 100644
--- a/sound/soc/sof/sof-priv.h
+++ b/sound/soc/sof/sof-priv.h
@@ -553,6 +553,8 @@ struct snd_sof_pcm *snd_sof_find_spcm_dai(struct snd_sof_dev *sdev,
 	return NULL;
 }
 
+bool snd_sof_dsp_d0i3_on_suspend(struct snd_sof_dev *sdev);
+
 struct snd_sof_pcm *snd_sof_find_spcm_name(struct snd_sof_dev *sdev,
 					   const char *name);
 struct snd_sof_pcm *snd_sof_find_spcm_comp(struct snd_sof_dev *sdev,
-- 
2.20.1

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