[alsa-devel] Applied "ASoC: SOF: PM: Add support for DSP D0i3 state when entering S0ix" to the asoc tree

[Mark Brown]

The patch

   ASoC: SOF: PM: Add support for DSP D0i3 state when entering S0ix

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 c470fc3f61b25e955f8ba90fc9dc554881e4e72c Mon Sep 17 00:00:00 2001
From: Keyon Jie <yang.jie at linux.intel.com>
Date: Fri, 25 Oct 2019 17:41:21 -0500
Subject: [PATCH] ASoC: SOF: PM: Add support for DSP D0i3 state when entering
 S0ix

When system is entering into S0ix, the PCI device may transition to the
D0i3 substate instead of D3. In D0i3, some always-on functionality can
be enabled, such as acoustic event detection, voice activity detection
or hotwording. When an event is detected, the DSP firmware can wake-up
the device for a transition to D0 with an interrupt.

Signed-off-by: Keyon Jie <yang.jie at linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Link: https://lore.kernel.org/r/20191025224122.7718-26-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie at kernel.org>
---
 sound/soc/sof/pm.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c
index 99e4e6ffff74..560a937e0484 100644
--- a/sound/soc/sof/pm.c
+++ b/sound/soc/sof/pm.c
@@ -430,12 +430,58 @@ EXPORT_SYMBOL(snd_sof_set_d0_substate);
 
 int snd_sof_resume(struct device *dev)
 {
+	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
+	int ret;
+
+	if (sdev->s0_suspend) {
+		/* resume from D0I3 */
+		dev_dbg(sdev->dev, "DSP will exit from D0i3...\n");
+		ret = snd_sof_set_d0_substate(sdev, SOF_DSP_D0I0);
+		if (ret == -ENOTSUPP) {
+			/* fallback to resume from D3 */
+			dev_dbg(sdev->dev, "D0i3 not supported, fall back to resume from D3...\n");
+			goto d3_resume;
+		} else if (ret < 0) {
+			dev_err(sdev->dev, "error: failed to exit from D0I3 %d\n",
+				ret);
+			return ret;
+		}
+
+		/* platform-specific resume from D0i3 */
+		return snd_sof_dsp_resume(sdev);
+	}
+
+d3_resume:
+	/* resume from D3 */
 	return sof_resume(dev, false);
 }
 EXPORT_SYMBOL(snd_sof_resume);
 
 int snd_sof_suspend(struct device *dev)
 {
+	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
+	int ret;
+
+	if (sdev->s0_suspend) {
+		/* suspend to D0i3 */
+		dev_dbg(sdev->dev, "DSP is trying to enter D0i3...\n");
+		ret = snd_sof_set_d0_substate(sdev, SOF_DSP_D0I3);
+		if (ret == -ENOTSUPP) {
+			/* fallback to D3 suspend */
+			dev_dbg(sdev->dev, "D0i3 not supported, fall back to D3...\n");
+			goto d3_suspend;
+		} else if (ret < 0) {
+			dev_err(sdev->dev, "error: failed to enter D0I3, %d\n",
+				ret);
+			return ret;
+		}
+
+		/* platform-specific suspend to D0i3 */
+		return snd_sof_dsp_suspend(sdev);
+	}
+
+d3_suspend:
+	/* suspend to D3 */
 	return sof_suspend(dev, false);
 }
 EXPORT_SYMBOL(snd_sof_suspend);
-- 
2.20.1