linux-kernel - [PATCH 1/2] ASoC: SOF: Activate runtime PM with SOF OF device

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Date:   Thu, 24 Sep 2020 18:15:17 +0300
From:   Daniel Baluta <daniel.baluta@....nxp.com>
To:     broonie@...nel.org
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] ASoC: SOF: Activate runtime PM with SOF OF device

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

SOF boots the DSP at probe and keeps it up all the time.
With this change, after booting if no one is using the DSP
the SOF core will turn off the DSP to save power.

Reviewed-by: Kai Vehmanen <kai.vehmanen@...ux.intel.com>
Reviewed-by: Paul Olaru <paul.olaru@....com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Signed-off-by: Daniel Baluta <daniel.baluta@....com>
---
 sound/soc/sof/sof-of-dev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/sof/sof-of-dev.c b/sound/soc/sof/sof-of-dev.c
index f492c5dfa659..de9acc0e33cb 100644
--- a/sound/soc/sof/sof-of-dev.c
+++ b/sound/soc/sof/sof-of-dev.c
@@ -56,7 +56,11 @@ static void sof_of_probe_complete(struct device *dev)
 	/* allow runtime_pm */
 	pm_runtime_set_autosuspend_delay(dev, SND_SOF_SUSPEND_DELAY_MS);
 	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);
+
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
 }
 
 static int sof_of_probe(struct platform_device *pdev)
-- 
2.17.1