[PATCH v4 01/11] ASoC: SOF: core: add 'no_wq' probe and remove callbacks

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

The existing DSP probe may be handled in a workqueue to allow for
extra time, typically for the i915 request_module and HDAudio codec
handling.

With the upcoming changes for i915/Xe driver relying on the
-EPROBE_DEFER mechanism, we need to have a first pass of the probe
which cannot be pushed to a workqueue. Introduce 2 new optional
callbacks.

Note that instead of probe_no_wq/probe we could have use a more
self-explanatory naming such as probe/probe_wq_allowed, but that would
have been a very intrusive change.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 sound/soc/sof/core.c     | 11 +++++++++--
 sound/soc/sof/ops.h      | 16 ++++++++++++++++
 sound/soc/sof/sof-priv.h |  2 ++
 3 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sof/core.c b/sound/soc/sof/core.c
index 30db685cc5f4b..54c384a5d6140 100644
--- a/sound/soc/sof/core.c
+++ b/sound/soc/sof/core.c
@@ -327,8 +327,6 @@ static int sof_probe_continue(struct snd_sof_dev *sdev)
 dsp_err:
 	snd_sof_remove(sdev);
 probe_err:
-	sof_ops_free(sdev);
-
 	/* all resources freed, update state to match */
 	sof_set_fw_state(sdev, SOF_FW_BOOT_NOT_STARTED);
 	sdev->first_boot = true;
@@ -436,6 +434,14 @@ int snd_sof_device_probe(struct device *dev, struct snd_sof_pdata *plat_data)
 
 	sof_set_fw_state(sdev, SOF_FW_BOOT_NOT_STARTED);
 
+	/*
+	 * first pass of probe which isn't allowed to run in a work-queue,
+	 * typically to rely on -EPROBE_DEFER dependencies
+	 */
+	ret = snd_sof_probe_no_wq(sdev);
+	if (ret < 0)
+		return ret;
+
 	if (IS_ENABLED(CONFIG_SND_SOC_SOF_PROBE_WORK_QUEUE)) {
 		INIT_WORK(&sdev->probe_work, sof_probe_work);
 		schedule_work(&sdev->probe_work);
@@ -487,6 +493,7 @@ int snd_sof_device_remove(struct device *dev)
 		snd_sof_free_debug(sdev);
 		snd_sof_remove(sdev);
 	}
+	snd_sof_remove_no_wq(sdev);
 
 	sof_ops_free(sdev);
 
diff --git a/sound/soc/sof/ops.h b/sound/soc/sof/ops.h
index 9ab7b9be765bc..2a03b152e9313 100644
--- a/sound/soc/sof/ops.h
+++ b/sound/soc/sof/ops.h
@@ -38,6 +38,14 @@ static inline void sof_ops_free(struct snd_sof_dev *sdev)
 /* Mandatory operations are verified during probing */
 
 /* init */
+static inline int snd_sof_probe_no_wq(struct snd_sof_dev *sdev)
+{
+	if (sof_ops(sdev)->probe_no_wq)
+		return sof_ops(sdev)->probe_no_wq(sdev);
+
+	return 0;
+}
+
 static inline int snd_sof_probe(struct snd_sof_dev *sdev)
 {
 	return sof_ops(sdev)->probe(sdev);
@@ -51,6 +59,14 @@ static inline int snd_sof_remove(struct snd_sof_dev *sdev)
 	return 0;
 }
 
+static inline int snd_sof_remove_no_wq(struct snd_sof_dev *sdev)
+{
+	if (sof_ops(sdev)->remove_no_wq)
+		return sof_ops(sdev)->remove_no_wq(sdev);
+
+	return 0;
+}
+
 static inline int snd_sof_shutdown(struct snd_sof_dev *sdev)
 {
 	if (sof_ops(sdev)->shutdown)
diff --git a/sound/soc/sof/sof-priv.h b/sound/soc/sof/sof-priv.h
index d4f6702e93dcb..addaef282ee92 100644
--- a/sound/soc/sof/sof-priv.h
+++ b/sound/soc/sof/sof-priv.h
@@ -165,6 +165,8 @@ struct sof_firmware {
 struct snd_sof_dsp_ops {
 
 	/* probe/remove/shutdown */
+	int (*probe_no_wq)(struct snd_sof_dev *sof_dev); /* optional */
+	int (*remove_no_wq)(struct snd_sof_dev *sof_dev); /* optional */
 	int (*probe)(struct snd_sof_dev *sof_dev); /* mandatory */
 	int (*remove)(struct snd_sof_dev *sof_dev); /* optional */
 	int (*shutdown)(struct snd_sof_dev *sof_dev); /* optional */
-- 
2.39.2