target/linux/bcm27xx/patches-5.15/950-0712-drm-vc4-Move-DSI-initialisation-to-encoder_mode_set.patch

   1 From d1f7e9e87961139c7da9a570b1858a8841a32d6e Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Mon, 7 Feb 2022 17:14:51 +0000
   4 Subject: [PATCH] drm/vc4: Move DSI initialisation to encoder_mode_set.
   5
   6 Breaking the bridge chain does not work for atomic bridges/panels
   7 and generally causes issues.
   8 We need to initialise the DSI host before the bridge pre_enables
   9 are called, so move that to encoder_mode_set in the same way that
  10 dw-mipi-dsi does.
  11
  12 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  13 ---
  14  drivers/gpu/drm/vc4/vc4_dsi.c | 17 +++++++++++++----
  15  1 file changed, 13 insertions(+), 4 deletions(-)
  16
  17 --- a/drivers/gpu/drm/vc4/vc4_dsi.c
  18 +++ b/drivers/gpu/drm/vc4/vc4_dsi.c
  19 @@ -872,19 +872,19 @@ static bool vc4_dsi_encoder_mode_fixup(s
  20         return true;
  21  }
  22
  23 -static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
  24 +static void vc4_dsi_encoder_mode_set(struct drm_encoder *encoder,
  25 +                                    struct drm_display_mode *user_mode,
  26 +                                    struct drm_display_mode *adjusted_mode)
  27  {
  28 -       struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
  29         struct vc4_dsi_encoder *vc4_encoder = to_vc4_dsi_encoder(encoder);
  30         struct vc4_dsi *dsi = vc4_encoder->dsi;
  31         struct device *dev = &dsi->pdev->dev;
  32         bool debug_dump_regs = false;
  33 -       struct drm_bridge *iter;
  34         unsigned long hs_clock;
  35         u32 ui_ns;
  36         /* Minimum LP state duration in escape clock cycles. */
  37         u32 lpx = dsi_esc_timing(60);
  38 -       unsigned long pixel_clock_hz = mode->clock * 1000;
  39 +       unsigned long pixel_clock_hz = adjusted_mode->clock * 1000;
  40         unsigned long dsip_clock;
  41         unsigned long phy_clock;
  42         int ret;
  43 @@ -1111,6 +1111,14 @@ static void vc4_dsi_encoder_enable(struc
  44                        ~DSI_PORT_BIT(PHY_AFEC0_RESET));
  45
  46         vc4_dsi_ulps(dsi, false);
  47 +}
  48 +
  49 +static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
  50 +{
  51 +       struct vc4_dsi_encoder *vc4_encoder = to_vc4_dsi_encoder(encoder);
  52 +       struct vc4_dsi *dsi = vc4_encoder->dsi;
  53 +       bool debug_dump_regs = false;
  54 +       struct drm_bridge *iter;
  55
  56         list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
  57                 if (iter->funcs->pre_enable)
  58 @@ -1376,6 +1384,7 @@ static const struct drm_encoder_helper_f
  59         .disable = vc4_dsi_encoder_disable,
  60         .enable = vc4_dsi_encoder_enable,
  61         .mode_fixup = vc4_dsi_encoder_mode_fixup,
  62 +       .mode_set = vc4_dsi_encoder_mode_set,
  63  };
  64
  65  static const struct vc4_dsi_variant bcm2711_dsi1_variant = {