target/linux/layerscape/patches-5.4/805-display-0052-LF-323-1-drm-bridge-cdns-move-link-training-to-bridg.patch

   1 From fa76cd6f0ed305fb2870083842b1ff7bcf027655 Mon Sep 17 00:00:00 2001
   2 From: Sandor Yu <Sandor.yu@nxp.com>
   3 Date: Mon, 9 Dec 2019 17:52:35 +0800
   4 Subject: [PATCH] LF-323-1: drm/bridge/cdns: move link training to bridge
   5  enable function
   6
   7 Move link training and video enable functions from mode_set to
   8 bridge_enable. it is more reasonable.
   9 cdns_dp_mode_set don't needed in HPD thread, DP link training will
  10 resetup in bridge_enable when cable connecting.
  11
  12 Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
  13 Reviewed-by: Robby Cai <robby.cai@nxp.com>
  14 ---
  15  drivers/gpu/drm/bridge/cadence/cdns-dp-core.c | 34 +++++++++++++--------------
  16  1 file changed, 16 insertions(+), 18 deletions(-)
  17
  18 --- a/drivers/gpu/drm/bridge/cadence/cdns-dp-core.c
  19 +++ b/drivers/gpu/drm/bridge/cadence/cdns-dp-core.c
  20 @@ -178,19 +178,6 @@ static void cdns_dp_mode_set(struct cdns
  21                 return;
  22         }
  23
  24 -       /* Link trainning */
  25 -       ret = cdns_mhdp_train_link(mhdp);
  26 -       if (ret) {
  27 -               DRM_DEV_ERROR(mhdp->dev, "Failed link train %d\n", ret);
  28 -               return;
  29 -       }
  30 -
  31 -       ret = cdns_mhdp_set_video_status(mhdp, CONTROL_VIDEO_VALID);
  32 -       if (ret) {
  33 -               DRM_DEV_ERROR(mhdp->dev, "Failed to valid video %d\n", ret);
  34 -               return;
  35 -       }
  36 -
  37         return;
  38  }
  39
  40 @@ -339,6 +326,21 @@ static void cdns_dp_bridge_mode_set(stru
  41
  42  static void cdn_hdp_bridge_enable(struct drm_bridge *bridge)
  43  {
  44 +       struct cdns_mhdp_device *mhdp = bridge->driver_private;
  45 +       int ret;
  46 +
  47 +       /* Link trainning */
  48 +       ret = cdns_mhdp_train_link(mhdp);
  49 +       if (ret) {
  50 +               DRM_DEV_ERROR(mhdp->dev, "Failed link train %d\n", ret);
  51 +               return;
  52 +       }
  53 +
  54 +       ret = cdns_mhdp_set_video_status(mhdp, CONTROL_VIDEO_VALID);
  55 +       if (ret) {
  56 +               DRM_DEV_ERROR(mhdp->dev, "Failed to valid video %d\n", ret);
  57 +               return;
  58 +       }
  59  }
  60
  61  static void cdn_hdp_bridge_disable(struct drm_bridge *bridge)
  62 @@ -366,11 +368,7 @@ static void hotplug_work_func(struct wor
  63         drm_helper_hpd_irq_event(connector->dev);
  64
  65         if (connector->status == connector_status_connected) {
  66 -               /* reset video mode after cable plugin */
  67 -               mutex_lock(&mhdp->lock);
  68 -               cdns_dp_mode_set(mhdp);
  69 -               mutex_unlock(&mhdp->lock);
  70 -
  71 +               /* Cable connedted  */
  72                 DRM_INFO("HDMI/DP Cable Plug In\n");
  73                 enable_irq(mhdp->irq[IRQ_OUT]);
  74         } else if (connector->status == connector_status_disconnected) {