target/linux/bcm27xx/patches-5.15/950-0713-drm-vc4-Remove-splitting-the-bridge-chain-from-the-d.patch

   1 From b5e5e7a57e2a0475826df547921d2bc72f0daf02 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Wed, 15 Dec 2021 17:44:49 +0000
   4 Subject: [PATCH] drm/vc4: Remove splitting the bridge chain from the
   5  driver.
   6
   7 Splitting the bridge chain fails for atomic bridges as the
   8 framework can't add the relevant state in
   9 drm_atomic_add_encoder_bridges.
  10 The chain was split because we needed to power up before
  11 calling pre_enable, but that is now done in mode_set, and will
  12 move into the framework.
  13
  14 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  15 ---
  16  drivers/gpu/drm/vc4/vc4_dsi.c | 38 -----------------------------------
  17  1 file changed, 38 deletions(-)
  18
  19 --- a/drivers/gpu/drm/vc4/vc4_dsi.c
  20 +++ b/drivers/gpu/drm/vc4/vc4_dsi.c
  21 @@ -554,7 +554,6 @@ struct vc4_dsi {
  22         struct mipi_dsi_host dsi_host;
  23         struct drm_encoder *encoder;
  24         struct drm_bridge *out_bridge;
  25 -       struct list_head bridge_chain;
  26
  27         void __iomem *regs;
  28
  29 @@ -798,23 +797,9 @@ static void vc4_dsi_encoder_disable(stru
  30         struct vc4_dsi_encoder *vc4_encoder = to_vc4_dsi_encoder(encoder);
  31         struct vc4_dsi *dsi = vc4_encoder->dsi;
  32         struct device *dev = &dsi->pdev->dev;
  33 -       struct drm_bridge *iter;
  34 -
  35 -       list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
  36 -               if (iter->funcs->disable)
  37 -                       iter->funcs->disable(iter);
  38 -
  39 -               if (iter == dsi->out_bridge)
  40 -                       break;
  41 -       }
  42
  43         vc4_dsi_ulps(dsi, true);
  44
  45 -       list_for_each_entry_from(iter, &dsi->bridge_chain, chain_node) {
  46 -               if (iter->funcs->post_disable)
  47 -                       iter->funcs->post_disable(iter);
  48 -       }
  49 -
  50         clk_disable_unprepare(dsi->pll_phy_clock);
  51         clk_disable_unprepare(dsi->escape_clock);
  52         clk_disable_unprepare(dsi->pixel_clock);
  53 @@ -1118,12 +1103,6 @@ static void vc4_dsi_encoder_enable(struc
  54         struct vc4_dsi_encoder *vc4_encoder = to_vc4_dsi_encoder(encoder);
  55         struct vc4_dsi *dsi = vc4_encoder->dsi;
  56         bool debug_dump_regs = false;
  57 -       struct drm_bridge *iter;
  58 -
  59 -       list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
  60 -               if (iter->funcs->pre_enable)
  61 -                       iter->funcs->pre_enable(iter);
  62 -       }
  63
  64         if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
  65                 DSI_PORT_WRITE(DISP0_CTRL,
  66 @@ -1140,11 +1119,6 @@ static void vc4_dsi_encoder_enable(struc
  67                                DSI_DISP0_ENABLE);
  68         }
  69
  70 -       list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
  71 -               if (iter->funcs->enable)
  72 -                       iter->funcs->enable(iter);
  73 -       }
  74 -
  75         if (debug_dump_regs) {
  76                 struct drm_printer p = drm_info_printer(&dsi->pdev->dev);
  77                 dev_info(&dsi->pdev->dev, "DSI regs after:\n");
  78 @@ -1588,7 +1562,6 @@ static int vc4_dsi_bind(struct device *d
  79         if (!vc4_dsi_encoder)
  80                 return -ENOMEM;
  81
  82 -       INIT_LIST_HEAD(&dsi->bridge_chain);
  83         vc4_dsi_encoder->base.type = dsi->variant->port ?
  84                         VC4_ENCODER_TYPE_DSI1 : VC4_ENCODER_TYPE_DSI0;
  85         vc4_dsi_encoder->dsi = dsi;
  86 @@ -1717,12 +1690,6 @@ static int vc4_dsi_bind(struct device *d
  87         ret = drm_bridge_attach(dsi->encoder, dsi->out_bridge, NULL, 0);
  88         if (ret)
  89                 return ret;
  90 -       /* Disable the atomic helper calls into the bridge.  We
  91 -        * manually call the bridge pre_enable / enable / etc. calls
  92 -        * from our driver, since we need to sequence them within the
  93 -        * encoder's enable/disable paths.
  94 -        */
  95 -       list_splice_init(&dsi->encoder->bridge_chain, &dsi->bridge_chain);
  96
  97         vc4_debugfs_add_regset32(drm, dsi->variant->debugfs_name, &dsi->regset);
  98
  99 @@ -1738,11 +1705,6 @@ static void vc4_dsi_unbind(struct device
 100
 101         pm_runtime_disable(dev);
 102
 103 -       /*
 104 -        * Restore the bridge_chain so the bridge detach procedure can happen
 105 -        * normally.
 106 -        */
 107 -       list_splice_init(&dsi->bridge_chain, &dsi->encoder->bridge_chain);
 108         drm_encoder_cleanup(dsi->encoder);
 109  }
 110