[L/Unstable] [PATCH 15/16] ALSA: hda: cs35l41: Add device_link between HDA and cs35l41_hda

[Kai-Heng Feng]

From: Stefan Binding <sbinding at opensource.cirrus.com>

BugLink: https://bugs.launchpad.net/bugs/2029199

To ensure consistency between the HDA core and the CS35L41 HDA
driver, add a device_link between them. This ensures that the
HDA core will suspend first, and resume second, meaning the
amp driver will not miss any events from the playback hook from
the HDA core during system suspend and resume.

Signed-off-by: Stefan Binding <sbinding at opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230721151816.2080453-11-sbinding@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai at suse.de>
(cherry picked from commit 7cf5ce66dfda2be444ea668c3d48f732ba4a7fd1 linux-next)
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
---
 sound/pci/hda/cs35l41_hda.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/cs35l41_hda.c b/sound/pci/hda/cs35l41_hda.c
index fa8c286c3370..3e1eb63f0c15 100644
--- a/sound/pci/hda/cs35l41_hda.c
+++ b/sound/pci/hda/cs35l41_hda.c
@@ -1067,6 +1067,7 @@ static int cs35l41_hda_bind(struct device *dev, struct device *master, void *mas
 {
 	struct cs35l41_hda *cs35l41 = dev_get_drvdata(dev);
 	struct hda_component *comps = master_data;
+	unsigned int sleep_flags;
 	int ret = 0;
 
 	if (!comps || cs35l41->index < 0 || cs35l41->index >= HDA_MAX_COMPONENTS)
@@ -1106,6 +1107,11 @@ static int cs35l41_hda_bind(struct device *dev, struct device *master, void *mas
 
 	mutex_unlock(&cs35l41->fw_mutex);
 
+	sleep_flags = lock_system_sleep();
+	if (!device_link_add(&comps->codec->core.dev, cs35l41->dev, DL_FLAG_STATELESS))
+		dev_warn(dev, "Unable to create device link\n");
+	unlock_system_sleep(sleep_flags);
+
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_put_autosuspend(dev);
 
@@ -1116,9 +1122,14 @@ static void cs35l41_hda_unbind(struct device *dev, struct device *master, void *
 {
 	struct cs35l41_hda *cs35l41 = dev_get_drvdata(dev);
 	struct hda_component *comps = master_data;
+	unsigned int sleep_flags;
 
-	if (comps[cs35l41->index].dev == dev)
+	if (comps[cs35l41->index].dev == dev) {
 		memset(&comps[cs35l41->index], 0, sizeof(*comps));
+		sleep_flags = lock_system_sleep();
+		device_link_remove(&comps->codec->core.dev, cs35l41->dev);
+		unlock_system_sleep(sleep_flags);
+	}
 }
 
 static const struct component_ops cs35l41_hda_comp_ops = {
-- 
2.34.1