target/linux/bcm27xx/patches-5.15/950-0631-drm-vc4-hdmi-Move-clock-calculation-into-its-own-fun.patch

   1 From 60b7ddb0b3c9d906a20d8a84e527ccf5a792a64b Mon Sep 17 00:00:00 2001
   2 From: Maxime Ripard <maxime@cerno.tech>
   3 Date: Thu, 2 Dec 2021 17:04:18 +0100
   4 Subject: [PATCH] drm/vc4: hdmi: Move clock calculation into its own
   5  function
   6
   7 The code to compute our clock rate for a given setup will be called in
   8 multiple places in the next patches, so let's create a separate function
   9 for it.
  10
  11 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  12 ---
  13  drivers/gpu/drm/vc4/vc4_hdmi.c | 49 +++++++++++++++++++++++-----------
  14  1 file changed, 34 insertions(+), 15 deletions(-)
  15
  16 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
  17 +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
  18 @@ -1263,6 +1263,35 @@ vc4_hdmi_encoder_clock_valid(const struc
  19         return MODE_OK;
  20  }
  21
  22 +static unsigned long long
  23 +vc4_hdmi_encoder_compute_mode_clock(const struct drm_display_mode *mode,
  24 +                                   unsigned int bpc)
  25 +{
  26 +       unsigned long long clock = mode->crtc_clock * 1000;
  27 +
  28 +       if (mode->flags & DRM_MODE_FLAG_DBLCLK)
  29 +               clock = clock * 2;
  30 +
  31 +       return clock * bpc / 8;
  32 +}
  33 +
  34 +static int
  35 +vc4_hdmi_encoder_compute_clock(const struct vc4_hdmi *vc4_hdmi,
  36 +                              struct vc4_hdmi_connector_state *vc4_state,
  37 +                              const struct drm_display_mode *mode,
  38 +                              unsigned int bpc)
  39 +{
  40 +       unsigned long long clock;
  41 +
  42 +       clock = vc4_hdmi_encoder_compute_mode_clock(mode, bpc);
  43 +       if (vc4_hdmi_encoder_clock_valid(vc4_hdmi, clock) != MODE_OK)
  44 +               return -EINVAL;
  45 +
  46 +       vc4_state->pixel_rate = clock;
  47 +
  48 +       return 0;
  49 +}
  50 +
  51  #define WIFI_2_4GHz_CH1_MIN_FREQ       2400000000ULL
  52  #define WIFI_2_4GHz_CH1_MAX_FREQ       2422000000ULL
  53
  54 @@ -1275,6 +1304,7 @@ static int vc4_hdmi_encoder_atomic_check
  55         struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
  56         unsigned long long pixel_rate = mode->clock * 1000;
  57         unsigned long long tmds_rate;
  58 +       int ret;
  59
  60         if (vc4_hdmi->variant->unsupported_odd_h_timings &&
  61             !(mode->flags & DRM_MODE_FLAG_DBLCLK) &&
  62 @@ -1296,21 +1326,10 @@ static int vc4_hdmi_encoder_atomic_check
  63                 pixel_rate = mode->clock * 1000;
  64         }
  65
  66 -       if (conn_state->max_bpc == 12) {
  67 -               pixel_rate = pixel_rate * 150;
  68 -               do_div(pixel_rate, 100);
  69 -       } else if (conn_state->max_bpc == 10) {
  70 -               pixel_rate = pixel_rate * 125;
  71 -               do_div(pixel_rate, 100);
  72 -       }
  73 -
  74 -       if (mode->flags & DRM_MODE_FLAG_DBLCLK)
  75 -               pixel_rate = pixel_rate * 2;
  76 -
  77 -       if (vc4_hdmi_encoder_clock_valid(vc4_hdmi, pixel_rate) != MODE_OK)
  78 -               return -EINVAL;
  79 -
  80 -       vc4_state->pixel_rate = pixel_rate;
  81 +       ret = vc4_hdmi_encoder_compute_clock(vc4_hdmi, vc4_state, mode,
  82 +                                            conn_state->max_bpc);
  83 +       if (ret)
  84 +               return ret;
  85
  86         return 0;
  87  }