Re: [PATCH v7 4/6] drm/i915: Initialize fbdev DRM client with callback functions

["Hogander, Jouni" <jouni.hogander@intel.com>]

On Fri, 2024-03-01 at 14:42 +0100, Thomas Zimmermann wrote:
> Initialize i915's fbdev client by giving an instance of struct
> drm_client_funcs to drm_client_init(). Also clean up with
> drm_client_release().
> 
> Doing this in i915 prevents fbdev helpers from initializing and
> releasing the client internally (see drm_fb_helper_init()). No
> functional change yet; the client callbacks will be filled later.
> 
> v6:
>         * rename client to "intel-fbdev" (Jouni)
> v2:
>         * call drm_fb_helper_unprepare() in error handling (Jani)
>         * fix typo in commit message (Sam)
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>

Reviewed-by: Jouni Högander <jouni.hogander@intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_fbdev.c | 43
> ++++++++++++++++++++--
>  1 file changed, 39 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c
> b/drivers/gpu/drm/i915/display/intel_fbdev.c
> index 76c0e89bf25e8..32aeb5faf706b 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
> @@ -286,6 +286,7 @@ static void intel_fbdev_destroy(struct
> intel_fbdev *ifbdev)
>         if (ifbdev->fb)
>                 drm_framebuffer_remove(&ifbdev->fb->base);
>  
> +       drm_client_release(&ifbdev->helper.client);
>         drm_fb_helper_unprepare(&ifbdev->helper);
>         kfree(ifbdev);
>  }
> @@ -579,6 +580,30 @@ void intel_fbdev_restore_mode(struct
> drm_i915_private *dev_priv)
>                 intel_fbdev_invalidate(ifbdev);
>  }
>  
> +/*
> + * Fbdev client and struct drm_client_funcs
> + */
> +
> +static void intel_fbdev_client_unregister(struct drm_client_dev
> *client)
> +{ }
> +
> +static int intel_fbdev_client_restore(struct drm_client_dev *client)
> +{
> +       return 0;
> +}
> +
> +static int intel_fbdev_client_hotplug(struct drm_client_dev *client)
> +{
> +       return 0;
> +}
> +
> +static const struct drm_client_funcs intel_fbdev_client_funcs = {
> +       .owner          = THIS_MODULE,
> +       .unregister     = intel_fbdev_client_unregister,
> +       .restore        = intel_fbdev_client_restore,
> +       .hotplug        = intel_fbdev_client_hotplug,
> +};
> +
>  int intel_fbdev_init(struct drm_device *dev)
>  {
>         struct drm_i915_private *dev_priv = to_i915(dev);
> @@ -600,16 +625,26 @@ int intel_fbdev_init(struct drm_device *dev)
>         else
>                 ifbdev->preferred_bpp = ifbdev->helper.preferred_bpp;
>  
> +       ret = drm_client_init(dev, &ifbdev->helper.client, "intel-
> fbdev",
> +                             &intel_fbdev_client_funcs);
> +       if (ret)
> +               goto err_drm_fb_helper_unprepare;
> +
>         ret = drm_fb_helper_init(dev, &ifbdev->helper);
> -       if (ret) {
> -               kfree(ifbdev);
> -               return ret;
> -       }
> +       if (ret)
> +               goto err_drm_client_release;
>  
>         dev_priv->display.fbdev.fbdev = ifbdev;
>         INIT_WORK(&dev_priv->display.fbdev.suspend_work,
> intel_fbdev_suspend_worker);
>  
>         return 0;
> +
> +err_drm_client_release:
> +       drm_client_release(&ifbdev->helper.client);
> +err_drm_fb_helper_unprepare:
> +       drm_fb_helper_unprepare(&ifbdev->helper);
> +       kfree(ifbdev);
> +       return ret;
>  }
>  
>  static void intel_fbdev_initial_config(void *data, async_cookie_t
> cookie)