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Date: Fri, 08 Feb 2019 15:24:12 +0300
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Hello, Maxime!

>+mode = drm_mode_duplicate(panel->drm, &default_mode);
>+if (!mode) {
>+DRM_DEV_ERROR(&ctx->dsi->dev,
>+      "Failed to add mode " DRM_MODE_FMT "\n",
>+      DRM_MODE_ARG(mode));
>+return -EINVAL;
>+}

Just small fix: DRM_MODE_ARG(mode) -> DRM_MODE_ARG(&default_mode).
The "mode" variable is NULL, it leads to the UB.