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

   1 From 28de437934da2fb9f04b0c4f5aa73553e63894e3 Mon Sep 17 00:00:00 2001
   2 From: Maxime Ripard <maxime@cerno.tech>
   3 Date: Mon, 21 Jun 2021 16:13:02 +0200
   4 Subject: [PATCH] drm/vc4: crtc: Add some logging
   5
   6 The encoder retrieval code has been a source of bugs and glitches in the
   7 past and the crtc <-> encoder association been wrong in a number of
   8 different ways.
   9
  10 Add some logging to quickly spot issues if they occur.
  11
  12 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  13 ---
  14  drivers/gpu/drm/vc4/vc4_crtc.c | 6 ++++++
  15  1 file changed, 6 insertions(+)
  16
  17 --- a/drivers/gpu/drm/vc4/vc4_crtc.c
  18 +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
  19 @@ -545,6 +545,9 @@ static void vc4_crtc_atomic_disable(stru
  20         struct drm_encoder *encoder = vc4_get_crtc_encoder(crtc, old_state);
  21         struct drm_device *dev = crtc->dev;
  22
  23 +       drm_dbg(dev, "Disabling CRTC %s (%u) connected to Encoder %s (%u)",
  24 +               crtc->name, crtc->base.id, encoder->name, encoder->base.id);
  25 +
  26         require_hvs_enabled(dev);
  27
  28         /* Disable vblank irq handling before crtc is disabled. */
  29 @@ -576,6 +579,9 @@ static void vc4_crtc_atomic_enable(struc
  30         struct drm_encoder *encoder = vc4_get_crtc_encoder(crtc, new_state);
  31         struct vc4_encoder *vc4_encoder = to_vc4_encoder(encoder);
  32
  33 +       drm_dbg(dev, "Enabling CRTC %s (%u) connected to Encoder %s (%u)",
  34 +               crtc->name, crtc->base.id, encoder->name, encoder->base.id);
  35 +
  36         require_hvs_enabled(dev);
  37
  38         /* Enable vblank irq handling before crtc is started otherwise