[PATCH 3/3] ASoC: SOF: Intel: hda-dsp: simplify S3 resume flows

[Pierre-Louis Bossart]

The flow contains surprising parts that seem to have been inspired by
the Skylake driver.

During a resume from S3, the state of the links prior to suspend
should not matter. One would have to assume that the links are powered
down anyways prior to suspend, and there is also no specific code that
turns links on unconditionally on resume.

Likewise, the snd_hdac_init_chip() routine will start the cmd_io
handling, and it's not clear why we should care about the state of the
DMA prior to suspend.

This patch removes these two sequences to simplify the flow.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
Reviewed-by: Rander Wang <rander.wang at intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao at linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi at linux.intel.com>
---
 sound/soc/sof/intel/hda-dsp.c | 14 --------------
 1 file changed, 14 deletions(-)

diff --git a/sound/soc/sof/intel/hda-dsp.c b/sound/soc/sof/intel/hda-dsp.c
index 3c76f843454b6..799c50fe24dab 100644
--- a/sound/soc/sof/intel/hda-dsp.c
+++ b/sound/soc/sof/intel/hda-dsp.c
@@ -677,10 +677,6 @@ static int hda_suspend(struct snd_sof_dev *sdev, bool runtime_suspend)
 
 static int hda_resume(struct snd_sof_dev *sdev, bool runtime_resume)
 {
-#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;
 
 	/* display codec must be powered before link reset */
@@ -707,16 +703,6 @@ static int hda_resume(struct snd_sof_dev *sdev, bool runtime_resume)
 		if (sdev->system_suspend_target == SOF_SUSPEND_NONE)
 			hda_codec_jack_check(sdev);
 	}
-
-	/* turn off the links that were off before suspend */
-	list_for_each_entry(hlink, &bus->hlink_list, list) {
-		if (!hlink->ref_count)
-			snd_hdac_ext_bus_link_power_down(hlink);
-	}
-
-	/* check dma status and clean up CORB/RIRB buffers */
-	if (!bus->cmd_dma_state)
-		snd_hdac_bus_stop_cmd_io(bus);
 #endif
 
 	/* enable ppcap interrupt */
-- 
2.34.1