linux-kernel - [PATCH] ASoC: SOF: pm: Tear down pipelines only if DSP was active

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Date:   Wed,  5 Apr 2023 12:26:55 +0300
From:   Daniel Baluta <daniel.baluta@....nxp.com>
To:     broonie@...nel.org, alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org, cujomalainey@...omium.org,
        tiwai@...e.com, perex@...ex.cz, kai.vehmanen@...ux.intel.com,
        ranjani.sridharan@...ux.intel.com, yung-chuan.liao@...ux.intel.com,
        peter.ujfalusi@...ux.intel.com, lgirdwood@...il.com,
        pierre-louis.bossart@...ux.intel.com
Subject: [PATCH] ASoC: SOF: pm: Tear down pipelines only if DSP was active

From: Daniel Baluta <daniel.baluta@....com>

With PCI if the device was suspended it is brought back to full
power and then suspended again.

This doesn't happen when device is described via DT.

We need to make sure that we tear down pipelines only if the device
was previously active (thus the pipelines were setup).

Otherwise, we can break the use_count:

[  219.009743] sof-audio-of-imx8m 3b6e8000.dsp:
sof_ipc3_tear_down_all_pipelines: widget PIPELINE.2.SAI3.IN is still in use: count -1

and after this everything stops working.

Fixes: d185e0689abc ("ASoC: SOF: pm: Always tear down pipelines before DSP suspend")
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
Signed-off-by: Daniel Baluta <daniel.baluta@....com>
---
 sound/soc/sof/pm.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sof/pm.c b/sound/soc/sof/pm.c
index c74ce8d414e7..2fdbc53ca715 100644
--- a/sound/soc/sof/pm.c
+++ b/sound/soc/sof/pm.c
@@ -188,6 +188,7 @@ static int sof_suspend(struct device *dev, bool runtime_suspend)
 	const struct sof_ipc_tplg_ops *tplg_ops = sof_ipc_get_ops(sdev, tplg);
 	pm_message_t pm_state;
 	u32 target_state = snd_sof_dsp_power_target(sdev);
+	u32 old_state = sdev->dsp_power_state.state;
 	int ret;
 
 	/* do nothing if dsp suspend callback is not set */
@@ -197,7 +198,12 @@ static int sof_suspend(struct device *dev, bool runtime_suspend)
 	if (runtime_suspend && !sof_ops(sdev)->runtime_suspend)
 		return 0;
 
-	if (tplg_ops && tplg_ops->tear_down_all_pipelines)
+	/* we need to tear down pipelines only if the DSP hardware is
+	 * active, which happens for PCI devices. if the device is
+	 * suspended, it is brought back to full power and then
+	 * suspended again
+	 */
+	if (tplg_ops && tplg_ops->tear_down_all_pipelines && (old_state == SOF_DSP_PM_D0))
 		tplg_ops->tear_down_all_pipelines(sdev, false);
 
 	if (sdev->fw_state != SOF_FW_BOOT_COMPLETE)
-- 
2.25.1