target/linux/bcm27xx/patches-5.10/950-0476-drm-vc4-Add-connector-check-to-trigger-mode_change-w.patch

   1 From c8a76985213abda828a2098c3d6ce8a49b5f9766 Mon Sep 17 00:00:00 2001
   2 From: Dom Cobley <popcornmix@gmail.com>
   3 Date: Fri, 5 Feb 2021 14:07:12 +0000
   4 Subject: [PATCH] drm/vc4: Add connector check to trigger mode_change
   5  when hdr metadata changes
   6
   7 Signed-off-by: Dom Cobley <popcornmix@gmail.com>
   8 ---
   9  drivers/gpu/drm/vc4/vc4_hdmi.c | 40 ++++++++++++++++++++++++++++++++++
  10  1 file changed, 40 insertions(+)
  11
  12 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
  13 +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
  14 @@ -223,6 +223,45 @@ static int vc4_hdmi_connector_get_modes(
  15         return ret;
  16  }
  17
  18 +static bool hdr_metadata_equal(const struct drm_connector_state *old_state,
  19 +                              const struct drm_connector_state *new_state)
  20 +{
  21 +       struct drm_property_blob *old_blob = old_state->hdr_output_metadata;
  22 +       struct drm_property_blob *new_blob = new_state->hdr_output_metadata;
  23 +
  24 +       if (!old_blob || !new_blob)
  25 +               return old_blob == new_blob;
  26 +
  27 +       if (old_blob->length != new_blob->length)
  28 +               return false;
  29 +
  30 +       return !memcmp(old_blob->data, new_blob->data, old_blob->length);
  31 +}
  32 +
  33 +static int vc4_hdmi_connector_atomic_check(struct drm_connector *connector,
  34 +                                         struct drm_atomic_state *state)
  35 +{
  36 +       struct drm_connector_state *old_state =
  37 +               drm_atomic_get_old_connector_state(state, connector);
  38 +       struct drm_connector_state *new_state =
  39 +               drm_atomic_get_new_connector_state(state, connector);
  40 +       struct drm_crtc *crtc = new_state->crtc;
  41 +       struct drm_crtc_state *crtc_state;
  42 +
  43 +       if (!crtc)
  44 +               return 0;
  45 +
  46 +       if (!hdr_metadata_equal(old_state, new_state)) {
  47 +               crtc_state = drm_atomic_get_crtc_state(state, crtc);
  48 +               if (IS_ERR(crtc_state))
  49 +                       return PTR_ERR(crtc_state);
  50 +
  51 +               crtc_state->mode_changed = true;
  52 +       }
  53 +
  54 +       return 0;
  55 +}
  56 +
  57  static void vc4_hdmi_connector_reset(struct drm_connector *connector)
  58  {
  59         struct vc4_hdmi_connector_state *old_state =
  60 @@ -272,6 +311,7 @@ static const struct drm_connector_funcs
  61
  62  static const struct drm_connector_helper_funcs vc4_hdmi_connector_helper_funcs = {
  63         .get_modes = vc4_hdmi_connector_get_modes,
  64 +       .atomic_check = vc4_hdmi_connector_atomic_check,
  65  };
  66
  67  static int vc4_hdmi_connector_init(struct drm_device *dev,