path: root/drivers/gpu
diff options
authorMaxime Ripard <>2021-05-25 11:10:59 +0200
committerMaxime Ripard <>2021-06-16 14:24:23 +0200
commit9984d6664ce9dcbbc713962539eaf7636ea246c2 (patch)
tree46fdbfba890f9f16aa6d3f4ef56c2dad41227963 /drivers/gpu
parent411efa18e4b03840553ff58ad9b4621b82a30c04 (diff)
drm/vc4: hdmi: Make sure the controller is powered in detect
If the HPD GPIO is not available and drm_probe_ddc fails, we end up reading the HDMI_HOTPLUG register, but the controller might be powered off resulting in a CPU hang. Make sure we have the power domain and the HSM clock powered during the detect cycle to prevent the hang from happening. Fixes: 4f6e3d66ac52 ("drm/vc4: Add runtime PM support to the HDMI encoder driver") Signed-off-by: Maxime Ripard <> Reviewed-by: Dave Stevenson <> Link:
Diffstat (limited to 'drivers/gpu')
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 84e218365045..8106b5634fe1 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -159,6 +159,8 @@ vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
bool connected = false;
+ WARN_ON(pm_runtime_resume_and_get(&vc4_hdmi->pdev->dev));
if (vc4_hdmi->hpd_gpio) {
if (gpio_get_value_cansleep(vc4_hdmi->hpd_gpio) ^
@@ -180,10 +182,12 @@ vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
+ pm_runtime_put(&vc4_hdmi->pdev->dev);
return connector_status_connected;
+ pm_runtime_put(&vc4_hdmi->pdev->dev);
return connector_status_disconnected;