ASoC: SOF: Intel: hda-dsp: implement suspend/resume for S0ix<->S0 transition

Enable system wake up via IPC interrupt from DSP when the system is
suspending to the S0ix state, and disable it in the corresponding
resuming.

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/20191025224122.7718-24-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/intel/hda-dsp.c b/sound/soc/sof/intel/hda-dsp.c
index b507040..d23573d 100644 (file)
--- a/sound/soc/sof/intel/hda-dsp.c
+++ b/sound/soc/sof/intel/hda-dsp.c
@@ -477,6 +477,15 @@ static int hda_resume(struct snd_sof_dev *sdev, bool runtime_resume)
 
 int hda_dsp_resume(struct snd_sof_dev *sdev)
 {
+       struct pci_dev *pci = to_pci_dev(sdev->dev);
+
+       if (sdev->s0_suspend) {
+               /* restore and disable the system wakeup */
+               pci_restore_state(pci);
+               disable_irq_wake(pci->irq);
+               return 0;
+       }
+
        /* init hda controller. DSP cores will be powered up during fw boot */
        return hda_resume(sdev, false);
 }
@@ -509,8 +518,16 @@ int hda_dsp_runtime_suspend(struct snd_sof_dev *sdev)
 int hda_dsp_suspend(struct snd_sof_dev *sdev)
 {
        struct hdac_bus *bus = sof_to_bus(sdev);
+       struct pci_dev *pci = to_pci_dev(sdev->dev);
        int ret;
 
+       if (sdev->s0_suspend) {
+               /* enable the system waking up via IPC IRQ */
+               enable_irq_wake(pci->irq);
+               pci_save_state(pci);
+               return 0;
+       }
+
        /* stop hda controller and power dsp off */
        ret = hda_suspend(sdev, false);
        if (ret < 0) {