From: Marcin Rajwa marcin.rajwa@linux.intel.com

This patch fixes the suspend & resume procedure to allow entry into the low power states with some streams being active as a wake source - wake on voice is a perfect example. The current implementation does not stop the CORB/RIRB DMA and does not power down the HDA links. With firmware's help, the platform has been able to still enter s0ix state on older platforms, but the sequence is still incorrect, and the additional driver actions are needed to ensure correct s0ix behaviour.

Signed-off-by: Marcin Rajwa marcin.rajwa@linux.intel.com Signed-off-by: Keyon Jie yang.jie@linux.intel.com Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Kai Vehmanen kai.vehmanen@linux.intel.com Signed-off-by: Ranjani Sridharan ranjani.sridharan@linux.intel.com --- sound/soc/sof/intel/hda-dsp.c | 38 +++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+)

diff --git a/sound/soc/sof/intel/hda-dsp.c b/sound/soc/sof/intel/hda-dsp.c index 4a40944acaef..89961397010a 100644 --- a/sound/soc/sof/intel/hda-dsp.c +++ b/sound/soc/sof/intel/hda-dsp.c @@ -696,12 +696,35 @@ int hda_dsp_resume(struct snd_sof_dev *sdev) .state = SOF_DSP_PM_D0, .substate = SOF_HDA_DSP_PM_D0I0, }; +#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA) + struct hdac_bus *bus = sof_to_bus(sdev); + struct hdac_ext_link *hlink = NULL; +#endif int ret;

/* resume from D0I3 */ if (sdev->dsp_power_state.state == SOF_DSP_PM_D0) { hda_codec_i915_display_power(sdev, true);

+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA) + /* power up links that were active before suspend */ + list_for_each_entry(hlink, &bus->hlink_list, list) { + if (hlink->ref_count) { + ret = snd_hdac_ext_bus_link_power_up(hlink); + if (ret < 0) { + dev_dbg(sdev->dev, + "error %x in %s: failed to power up links", + ret, __func__); + return ret; + } + } + } + + /* set up CORB/RIRB buffers if was on before suspend */ + if (bus->cmd_dma_state) + snd_hdac_bus_init_cmd_io(bus); +#endif + /* Set DSP power state */ ret = snd_sof_dsp_set_power_state(sdev, &target_state); if (ret < 0) { @@ -808,6 +831,21 @@ int hda_dsp_suspend(struct snd_sof_dev *sdev, u32 target_state) HDA_VS_INTEL_EM2_L1SEN, HDA_VS_INTEL_EM2_L1SEN);

+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA) + /* stop the CORB/RIRB DMA if it is On */ + if (bus->cmd_dma_state) + snd_hdac_bus_stop_cmd_io(bus); + + /* no link can be powered in s0ix state */ + ret = snd_hdac_ext_bus_link_power_down_all(bus); + if (ret < 0) { + dev_dbg(sdev->dev, + "error %d in %s: failed to power down links", + ret, __func__); + return ret; + } +#endif + /* enable the system waking up via IPC IRQ */ enable_irq_wake(pci->irq); pci_save_state(pci);