1 files changed, 38 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0645-drm-vc4-crtc-Add-some-logging.patch b/target/linux/bcm27xx/patches-5.10/950-0645-drm-vc4-crtc-Add-some-logging.patch
new file mode 100644
index 0000000000..fbc1f90e3f
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.10/950-0645-drm-vc4-crtc-Add-some-logging.patch
@@ -0,0 +1,38 @@
+From bcdc0a4520ea59c3e888ebb91c8f41e55841297d Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime@cerno.tech>
+Date: Mon, 21 Jun 2021 16:13:02 +0200
+Subject: [PATCH] drm/vc4: crtc: Add some logging
+
+The encoder retrieval code has been a source of bugs and glitches in the
+past and the crtc <-> encoder association been wrong in a number of
+different ways.
+
+Add some logging to quickly spot issues if they occur.
+
+Signed-off-by: Maxime Ripard <maxime@cerno.tech>
+---
+ drivers/gpu/drm/vc4/vc4_crtc.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+--- a/drivers/gpu/drm/vc4/vc4_crtc.c
++++ b/drivers/gpu/drm/vc4/vc4_crtc.c
+@@ -525,6 +525,9 @@ static void vc4_crtc_atomic_disable(stru
+ 	struct drm_encoder *encoder = vc4_get_crtc_encoder(crtc, old_state);
+ 	struct drm_device *dev = crtc->dev;
+ 
++	drm_dbg(dev, "Disabling CRTC %s (%u) connected to Encoder %s (%u)",
++		crtc->name, crtc->base.id, encoder->name, encoder->base.id);
++
+ 	require_hvs_enabled(dev);
+ 
+ 	/* Disable vblank irq handling before crtc is disabled. */
+@@ -556,6 +559,9 @@ static void vc4_crtc_atomic_enable(struc
+ 	struct drm_encoder *encoder = vc4_get_crtc_encoder(crtc, new_state);
+ 	struct vc4_encoder *vc4_encoder = to_vc4_encoder(encoder);
+ 
++	drm_dbg(dev, "Enabling CRTC %s (%u) connected to Encoder %s (%u)",
++		crtc->name, crtc->base.id, encoder->name, encoder->base.id);
++
+ 	require_hvs_enabled(dev);
+ 
+ 	/* Enable vblank irq handling before crtc is started otherwise