From: Keyon Jie yang.jie@linux.intel.com
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@linux.intel.com Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- 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);