From: Keyon Jie <yang.jie@xxxxxxxxxxxxxxx>
Set L1SEN to make sure the system can enter S0ix, and restore it on
resume.
Signed-off-by: Keyon Jie <yang.jie@xxxxxxxxxxxxxxx>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
sound/soc/sof/intel/hda-dsp.c | 15 +++++++++++++++
sound/soc/sof/intel/hda.h | 3 +++
2 files changed, 18 insertions(+)
diff --git a/sound/soc/sof/intel/hda-dsp.c b/sound/soc/sof/intel/hda-dsp.c
index d23573d9e9c4..3a54edd017fe 100644
--- a/sound/soc/sof/intel/hda-dsp.c
+++ b/sound/soc/sof/intel/hda-dsp.c
@@ -477,9 +477,16 @@ static int hda_resume(struct snd_sof_dev *sdev, bool runtime_resume)
int hda_dsp_resume(struct snd_sof_dev *sdev)
{
+ struct sof_intel_hda_dev *hda = sdev->pdata->hw_pdata;
struct pci_dev *pci = to_pci_dev(sdev->dev);
if (sdev->s0_suspend) {
+ /* restore L1SEN bit */
+ if (hda->l1_support_changed)
+ snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR,
+ HDA_VS_INTEL_EM2,
+ HDA_VS_INTEL_EM2_L1SEN, 0);
+
/* restore and disable the system wakeup */
pci_restore_state(pci);
disable_irq_wake(pci->irq);
@@ -517,11 +524,19 @@ int hda_dsp_runtime_suspend(struct snd_sof_dev *sdev)
int hda_dsp_suspend(struct snd_sof_dev *sdev)
{
+ struct sof_intel_hda_dev *hda = sdev->pdata->hw_pdata;
struct hdac_bus *bus = sof_to_bus(sdev);
struct pci_dev *pci = to_pci_dev(sdev->dev);
int ret;
if (sdev->s0_suspend) {
+ /* enable L1SEN to make sure the system can enter S0Ix */
+ hda->l1_support_changed =
+ snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR,
+ HDA_VS_INTEL_EM2,
+ HDA_VS_INTEL_EM2_L1SEN,
+ HDA_VS_INTEL_EM2_L1SEN);
+
/* enable the system waking up via IPC IRQ */
enable_irq_wake(pci->irq);
pci_save_state(pci);
diff --git a/sound/soc/sof/intel/hda.h b/sound/soc/sof/intel/hda.h
index 5ad73a34b09c..18d7e72bf9b7 100644
--- a/sound/soc/sof/intel/hda.h
+++ b/sound/soc/sof/intel/hda.h
@@ -408,6 +408,9 @@ struct sof_intel_hda_dev {
int irq;
+ /* PM related */
+ bool l1_support_changed;/* during suspend, is L1SEN changed or not */
+
/* DMIC device */
struct platform_device *dmic_dev;
};
--
2.20.1
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