From 4ea3bfd13a2484b5f1c19f60b1dc7494f261f0a4 Mon Sep 17 00:00:00 2001 From: Pierre-Louis Bossart Date: Thu, 16 Jun 2022 16:08:24 -0500 Subject: [PATCH] ASoC: SOF: pcm: use pm_resume_and_get() on component probe MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Before initiating IPC and/or bus transactions when loading the topology during a component probe, which happens on card registration/creation, make sure the device for the SOF driver is pm_runtime active. The SOF probe is not necessarily followed by the component probe, such a timing assumption can be broken in driver bind/unbind tests. This can be artifially shown if the module for the machine driver is 'blacklisted' and the SOF device becomes pm_runtime_suspended before manually calling modprobe to register the card. In an initial experiment, pm_resume_and_get() was called from soc-component.c, since the current ASoC component model is arguably missing dependencies between component status and device status. However this approach proved too invasive and breaks all existing HDMI playback solutions on Intel platforms. While this will result in duplication of code, generating pm_runtime transitions only if strictly required for a given component makes more sense overall. This patch adds the pm_runtime resume transition for SOF only. BugLink: https://github.com/thesofproject/linux/issues/3651 Signed-off-by: Pierre-Louis Bossart Reviewed-by: Rander Wang Reviewed-by: Ranjani Sridharan Reviewed-by: Bard Liao Reviewed-by: Péter Ujfalusi Link: https://lore.kernel.org/r/20220616210825.132093-2-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown --- sound/soc/sof/pcm.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/sound/soc/sof/pcm.c b/sound/soc/sof/pcm.c index a76d0b5b2ad9..27504abc5385 100644 --- a/sound/soc/sof/pcm.c +++ b/sound/soc/sof/pcm.c @@ -604,6 +604,14 @@ static int sof_pcm_probe(struct snd_soc_component *component) const char *tplg_filename; int ret; + /* + * make sure the device is pm_runtime_active before loading the + * topology and initiating IPC or bus transactions + */ + ret = pm_runtime_resume_and_get(component->dev); + if (ret < 0 && ret != -EACCES) + return ret; + /* load the default topology */ sdev->component = component; @@ -621,6 +629,9 @@ static int sof_pcm_probe(struct snd_soc_component *component) return ret; } + pm_runtime_mark_last_busy(component->dev); + pm_runtime_put_autosuspend(component->dev); + return ret; }