target/linux/layerscape/patches-5.4/805-display-0055-LF-568-2-drm-gpu-bridge-cdns-Add-force-mode-set-flag.patch

   1 From d13b544c949e85e39f6c1c20485d8f37f5127e59 Mon Sep 17 00:00:00 2001
   2 From: Sandor Yu <Sandor.yu@nxp.com>
   3 Date: Fri, 20 Dec 2019 17:31:52 +0800
   4 Subject: [PATCH] LF-568-2: drm: gpu: bridge: cdns: Add force mode set flag
   5
   6 In DRM framework, when hdmi/dp cable plugout/plugin in the same HDMI
   7 sink, because the video mode is same, DRM will not call mode_set.
   8 But for HDMI 2.0 sink the SCDC configurate will lost, and DP sink
   9 linktraning status will lost too after cable plugout then plugin.
  10
  11 Currently, hdmi/dp driver will call mode_set function in HPD thread,
  12 But the mode_set function is called out of DRM framework, and it have
  13 chance to fail.
  14 In the patch add force_mode_set flag, set the crtc_state->mode_changed
  15 to force drm call mode_set when cable plugin.
  16
  17 Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
  18 ---
  19  drivers/gpu/drm/bridge/cadence/cdns-dp-core.c   |  5 +++++
  20  drivers/gpu/drm/bridge/cadence/cdns-hdmi-core.c | 12 ++++++++----
  21  drivers/gpu/drm/imx/cdn-mhdp-imxdrv.c           |  4 ++++
  22  include/drm/bridge/cdns-mhdp-common.h           |  1 +
  23  4 files changed, 18 insertions(+), 4 deletions(-)
  24
  25 --- a/drivers/gpu/drm/bridge/cadence/cdns-dp-core.c
  26 +++ b/drivers/gpu/drm/bridge/cadence/cdns-dp-core.c
  27 @@ -322,6 +322,9 @@ static void cdns_dp_bridge_mode_set(stru
  28         mutex_lock(&mhdp->lock);
  29         cdns_dp_mode_set(mhdp);
  30         mutex_unlock(&mhdp->lock);
  31 +
  32 +       /* reset force mode set flag */
  33 +       mhdp->force_mode_set = false;
  34  }
  35
  36  static void cdn_dp_bridge_enable(struct drm_bridge *bridge)
  37 @@ -375,6 +378,8 @@ static void hotplug_work_func(struct wor
  38         } else if (connector->status == connector_status_disconnected) {
  39                 /* Cable Disconnedted  */
  40                 DRM_INFO("HDMI/DP Cable Plug Out\n");
  41 +               /* force mode set for cable replugin to recovery DP video modes */
  42 +               mhdp->force_mode_set = true;
  43                 enable_irq(mhdp->irq[IRQ_IN]);
  44         }
  45  }
  46 --- a/drivers/gpu/drm/bridge/cadence/cdns-hdmi-core.c
  47 +++ b/drivers/gpu/drm/bridge/cadence/cdns-hdmi-core.c
  48 @@ -178,6 +178,10 @@ void cdns_hdmi_mode_set(struct cdns_mhdp
  49         struct drm_display_mode *mode = &mhdp->mode;
  50         int ret;
  51
  52 +       /* video mode valid check */
  53 +       if (mode->clock == 0 || mode->hdisplay == 0 ||  mode->vdisplay == 0)
  54 +               return;
  55 +
  56         hdmi_lanes_config(mhdp);
  57
  58         cdns_mhdp_plat_call(mhdp, pclk_rate);
  59 @@ -393,6 +397,8 @@ static void cdns_hdmi_bridge_mode_set(st
  60         mutex_lock(&mhdp->lock);
  61         cdns_hdmi_mode_set(mhdp);
  62         mutex_unlock(&mhdp->lock);
  63 +       /* reset force mode set flag */
  64 +       mhdp->force_mode_set = false;
  65  }
  66
  67  bool cdns_hdmi_bridge_mode_fixup(struct drm_bridge *bridge,
  68 @@ -467,14 +473,12 @@ static void hotplug_work_func(struct wor
  69
  70         if (connector->status == connector_status_connected) {
  71                 DRM_INFO("HDMI Cable Plug In\n");
  72 -               /* reset video mode after cable plugin */
  73 -               mutex_lock(&mhdp->lock);
  74 -               cdns_hdmi_mode_set(mhdp);
  75 -               mutex_unlock(&mhdp->lock);
  76                 enable_irq(mhdp->irq[IRQ_OUT]);
  77         } else if (connector->status == connector_status_disconnected) {
  78                 /* Cable Disconnedted  */
  79                 DRM_INFO("HDMI Cable Plug Out\n");
  80 +               /* force mode set for cable replugin to recovery HDMI2.0 video modes */
  81 +               mhdp->force_mode_set = true;
  82                 enable_irq(mhdp->irq[IRQ_IN]);
  83         }
  84  }
  85 --- a/drivers/gpu/drm/imx/cdn-mhdp-imxdrv.c
  86 +++ b/drivers/gpu/drm/imx/cdn-mhdp-imxdrv.c
  87 @@ -40,6 +40,10 @@ static int cdns_mhdp_imx_encoder_atomic_
  88
  89         if (mhdp->plat_data->video_format != 0)
  90                 imx_crtc_state->bus_format = mhdp->plat_data->video_format;
  91 +
  92 +       if (mhdp->force_mode_set)
  93 +               crtc_state->mode_changed = true;
  94 +
  95         return 0;
  96  }
  97
  98 --- a/include/drm/bridge/cdns-mhdp-common.h
  99 +++ b/include/drm/bridge/cdns-mhdp-common.h
 100 @@ -684,6 +684,7 @@ struct cdns_mhdp_device {
 101         bool link_up;
 102         bool power_up;
 103         bool plugged;
 104 +       bool force_mode_set;
 105         bool is_hpd;
 106         bool is_ls1028a;
 107         struct mutex lock;