[PATCH 07/11] drm/vc4: hdmi: Disable connector status polling during suspend

[Stefan Wahren <wahrenst@gmx.net>]

Suspend of VC4 HDMI will likely triggers a warning from
vc4_hdmi_connector_detect_ctx() during poll of connector status.
The power management will prevent the resume and keep the relevant
power domain disabled.

Since there is no reason to poll the connector status during
suspend, the polling should be disabled during this.

It not possible to use drm_mode_config_helper_suspend() here,
because the callbacks might be called during bind phase and not all
components are fully initialized.

Link: https://lore.kernel.org/dri-devel/7003512d-7303-4f41-b0d6-a8af5bf8e497@gmx.net/
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index b3a42b709718..e80495cea6ac 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -3106,6 +3106,13 @@ static int vc5_hdmi_init_resources(struct drm_device *drm,
 static int vc4_hdmi_runtime_suspend(struct device *dev)
 {
 	struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
+	struct drm_device *drm = vc4_hdmi->connector.dev;
+
+	/*
+	 * Don't disable polling if it was never initialized
+	 */
+	if (drm && drm->mode_config.poll_enabled)
+		drm_kms_helper_poll_disable(drm);

 	clk_disable_unprepare(vc4_hdmi->hsm_clock);

@@ -3115,6 +3122,7 @@ static int vc4_hdmi_runtime_suspend(struct device *dev)
 static int vc4_hdmi_runtime_resume(struct device *dev)
 {
 	struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
+	struct drm_device *drm = vc4_hdmi->connector.dev;
 	unsigned long __maybe_unused flags;
 	u32 __maybe_unused value;
 	unsigned long rate;
@@ -3159,6 +3167,9 @@ static int vc4_hdmi_runtime_resume(struct device *dev)
 	}
 #endif

+	if (drm && drm->mode_config.poll_enabled)
+		drm_kms_helper_poll_enable(drm);
+
 	return 0;

 err_disable_clk:
--
2.34.1