target/linux/bcm27xx/patches-5.10/950-0415-drm-vc4-hdmi-Store-pixel-frequency-in-the-connector-.patch

   1 From 1dd22d945a99fa35e387e01101c758ae7be3d9a4 Mon Sep 17 00:00:00 2001
   2 From: Maxime Ripard <maxime@cerno.tech>
   3 Date: Tue, 15 Dec 2020 16:42:40 +0100
   4 Subject: [PATCH] drm/vc4: hdmi: Store pixel frequency in the connector
   5  state
   6
   7 The pixel rate is for now quite simple to compute, but with more features
   8 (30 and 36 bits output, YUV output, etc.) will depend on a bunch of
   9 connectors properties.
  10
  11 Let's store the rate we have to run the pixel clock at in our custom
  12 connector state, and compute it in atomic_check.
  13
  14 Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
  15 Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  16 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  17 ---
  18  drivers/gpu/drm/vc4/vc4_hdmi.c | 26 +++++++++++++++++++++++++-
  19  drivers/gpu/drm/vc4/vc4_hdmi.h |  1 +
  20  2 files changed, 26 insertions(+), 1 deletion(-)
  21
  22 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
  23 +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
  24 @@ -243,6 +243,7 @@ vc4_hdmi_connector_duplicate_state(struc
  25         if (!new_state)
  26                 return NULL;
  27
  28 +       new_state->pixel_rate = vc4_state->pixel_rate;
  29         __drm_atomic_helper_connector_duplicate_state(connector, &new_state->base);
  30
  31         return &new_state->base;
  32 @@ -669,9 +670,29 @@ static void vc4_hdmi_recenter_fifo(struc
  33                   "VC4_HDMI_FIFO_CTL_RECENTER_DONE");
  34  }
  35
  36 +static struct drm_connector_state *
  37 +vc4_hdmi_encoder_get_connector_state(struct drm_encoder *encoder,
  38 +                                    struct drm_atomic_state *state)
  39 +{
  40 +       struct drm_connector_state *conn_state;
  41 +       struct drm_connector *connector;
  42 +       unsigned int i;
  43 +
  44 +       for_each_new_connector_in_state(state, connector, conn_state, i) {
  45 +               if (conn_state->best_encoder == encoder)
  46 +                       return conn_state;
  47 +       }
  48 +
  49 +       return NULL;
  50 +}
  51 +
  52  static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
  53                                                 struct drm_atomic_state *state)
  54  {
  55 +       struct drm_connector_state *conn_state =
  56 +               vc4_hdmi_encoder_get_connector_state(encoder, state);
  57 +       struct vc4_hdmi_connector_state *vc4_conn_state =
  58 +               conn_state_to_vc4_hdmi_conn_state(conn_state);
  59         struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
  60         struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
  61         unsigned long pixel_rate, hsm_rate;
  62 @@ -683,7 +704,7 @@ static void vc4_hdmi_encoder_pre_crtc_co
  63                 return;
  64         }
  65
  66 -       pixel_rate = mode->clock * 1000 * ((mode->flags & DRM_MODE_FLAG_DBLCLK) ? 2 : 1);
  67 +       pixel_rate = vc4_conn_state->pixel_rate;
  68         ret = clk_set_rate(vc4_hdmi->pixel_clock, pixel_rate);
  69         if (ret) {
  70                 DRM_ERROR("Failed to set pixel clock rate: %d\n", ret);
  71 @@ -845,6 +866,7 @@ static int vc4_hdmi_encoder_atomic_check
  72                                          struct drm_crtc_state *crtc_state,
  73                                          struct drm_connector_state *conn_state)
  74  {
  75 +       struct vc4_hdmi_connector_state *vc4_state = conn_state_to_vc4_hdmi_conn_state(conn_state);
  76         struct drm_display_mode *mode = &crtc_state->adjusted_mode;
  77         struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
  78         unsigned long long pixel_rate = mode->clock * 1000;
  79 @@ -876,6 +898,8 @@ static int vc4_hdmi_encoder_atomic_check
  80         if (pixel_rate > vc4_hdmi->variant->max_pixel_clock)
  81                 return -EINVAL;
  82
  83 +       vc4_state->pixel_rate = pixel_rate;
  84 +
  85         return 0;
  86  }
  87
  88 --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
  89 +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
  90 @@ -189,6 +189,7 @@ encoder_to_vc4_hdmi(struct drm_encoder *
  91
  92  struct vc4_hdmi_connector_state {
  93         struct drm_connector_state      base;
  94 +       unsigned long long              pixel_rate;
  95  };
  96
  97  static inline struct vc4_hdmi_connector_state *