[PATCH V3 4/9] drm/vc4: hdmi: add PM suspend/resume support

[Stefan Wahren <wahrenst@gmx.net>]

Add suspend/resume support for the VC4 HDMI component in order
to handle suspend to idle properly. Since the HDMI power domain
is powered down during suspend, this makes connector status polling
pointless.

Link: https://lore.kernel.org/dri-devel/7003512d-7303-4f41-b0d6-a8af5bf8e497@gmx.net/
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Acked-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 6611ab7c26a6..f7a4ed16094e 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -3104,6 +3104,31 @@ static int vc5_hdmi_init_resources(struct drm_device *drm,
 	return 0;
 }

+static int vc4_hdmi_suspend(struct device *dev)
+{
+	struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
+	struct drm_device *drm = vc4_hdmi->connector.dev;
+
+	if (drm && drm->mode_config.poll_enabled)
+		drm_kms_helper_poll_disable(drm);
+
+	return pm_runtime_force_suspend(dev);
+}
+
+static int vc4_hdmi_resume(struct device *dev)
+{
+	struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
+	struct drm_device *drm = vc4_hdmi->connector.dev;
+	int ret;
+
+	ret = pm_runtime_force_resume(dev);
+
+	if (drm && drm->mode_config.poll_enabled)
+		drm_kms_helper_poll_enable(drm);
+
+	return ret;
+}
+
 static int vc4_hdmi_runtime_suspend(struct device *dev)
 {
 	struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
@@ -3405,6 +3430,7 @@ static const struct dev_pm_ops vc4_hdmi_pm_ops = {
 	SET_RUNTIME_PM_OPS(vc4_hdmi_runtime_suspend,
 			   vc4_hdmi_runtime_resume,
 			   NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(vc4_hdmi_suspend, vc4_hdmi_resume)
 };

 struct platform_driver vc4_hdmi_driver = {
--
2.34.1