[PATCH 1/6] drm/vc4: Release runtime PM reference after binding V3D

[Maíra Canal <mcanal@igalia.com>]

The vc4_v3d_bind() function acquires a runtime PM reference via
pm_runtime_resume_and_get() to access V3D registers during setup.
However, this reference is never released after a successful bind.
This prevents the device from ever runtime suspending, since the
reference count never reaches zero.

Release the runtime PM reference by adding pm_runtime_put_autosuspend()
after autosuspend is configured, allowing the device to runtime suspend
after the delay.

Fixes: 266cff37d7fc ("drm/vc4: v3d: Rework the runtime_pm setup")
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
---
 drivers/gpu/drm/vc4/vc4_v3d.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/vc4/vc4_v3d.c b/drivers/gpu/drm/vc4/vc4_v3d.c
index 3ffe09bc89d273c2ec598f391147425d9f6785bf..d31b906cb8e787517ba3ff72c236ffcf810522b1 100644
--- a/drivers/gpu/drm/vc4/vc4_v3d.c
+++ b/drivers/gpu/drm/vc4/vc4_v3d.c
@@ -481,6 +481,7 @@ static int vc4_v3d_bind(struct device *dev, struct device *master, void *data)
 
 	pm_runtime_use_autosuspend(dev);
 	pm_runtime_set_autosuspend_delay(dev, 40); /* a little over 2 frames. */
+	pm_runtime_put_autosuspend(dev);
 
 	return 0;
 

-- 
2.53.0