openwrt/target/linux/bcm27xx/patches-5.15/950-0016-drm-vc4-crtc-Add-some-logging.patch

From 28de437934da2fb9f04b0c4f5aa73553e63894e3 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
@@ -543,6 +543,9 @@ 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. */
@@ -574,6 +577,9 @@ 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