[PATCH v8 06/10] drm/vc4: crtc: Add some logging

From: Maxime Ripard
Date: Mon Oct 25 2021 - 11:29:40 EST


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@xxxxxxxxxx>
---
drivers/gpu/drm/vc4/vc4_crtc.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index fbc1d4638650..6decaa12a078 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -541,6 +541,9 @@ static void vc4_crtc_atomic_disable(struct drm_crtc *crtc,
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. */
@@ -572,6 +575,9 @@ static void vc4_crtc_atomic_enable(struct drm_crtc *crtc,
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
--
2.31.1