Re: [PATCH v5 7/7] drm/i915: Implement fbdev emulation as in-kernel client

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Hi

Am 25.10.23 um 13:36 schrieb Hogander, Jouni:
[...]
+
+       if (!drm_drv_uses_atomic_modeset(dev))
+               drm_helper_disable_unused_functions(dev);

Can you please explain why this is needed here?

This disables some parts of the mode-setting pipeline and is required for drivers with non-atomic commits. AFAICT atomic mode setting is not supported on some very old Intel chips. [1] I'll leave a short comment on the code.

[1] https://elixir.bootlin.com/linux/v6.6/source/drivers/gpu/drm/i915/intel_device_info.c#L399

Best regard
Thomas


+
+       ret = drm_fb_helper_initial_config(fb_helper);
+       if (ret)
+               goto err_drm_fb_helper_fini;
+
+       vga_switcheroo_client_fb_set(pdev, fb_helper->info);
        return 0;
+
+err_drm_fb_helper_fini:
+       drm_fb_helper_fini(fb_helper);
+err_drm_err:
+       drm_err(dev, "Failed to setup i915 fbdev emulation
(ret=%d)\n", ret);
+       return ret;
  }
 static const struct drm_client_funcs intel_fbdev_client_funcs = {
@@ -703,22 +729,23 @@ static const struct drm_client_funcs
intel_fbdev_client_funcs = {
         .hotplug        = intel_fbdev_client_hotplug,
  };
-int intel_fbdev_init(struct drm_device *dev)
+void intel_fbdev_setup(struct drm_i915_private *dev_priv)

Use i915 rather than dev_priv.

BR,

Jouni Högander

  {
-       struct drm_i915_private *dev_priv = to_i915(dev);
+       struct drm_device *dev = &dev_priv->drm;
         struct intel_fbdev *ifbdev;
         int ret;
-       if (drm_WARN_ON(dev, !HAS_DISPLAY(dev_priv)))
-               return -ENODEV;
+       if (!HAS_DISPLAY(dev_priv))
+               return;
        ifbdev = kzalloc(sizeof(*ifbdev), GFP_KERNEL);
         if (!ifbdev)
-               return -ENOMEM;
-
-       mutex_init(&ifbdev->hpd_lock);
+               return;
         drm_fb_helper_prepare(dev, &ifbdev->helper, 32,
&intel_fb_helper_funcs);
+       dev_priv->display.fbdev.fbdev = ifbdev;
+       INIT_WORK(&dev_priv->display.fbdev.suspend_work,
intel_fbdev_suspend_worker);
+       mutex_init(&ifbdev->hpd_lock);
         if (intel_fbdev_init_bios(dev, ifbdev))
                 ifbdev->helper.preferred_bpp = ifbdev->preferred_bpp;
         else
@@ -726,68 +753,19 @@ int intel_fbdev_init(struct drm_device *dev)
        ret = drm_client_init(dev, &ifbdev->helper.client, "i915-
fbdev",
                               &intel_fbdev_client_funcs);
-       if (ret)
+       if (ret) {
+               drm_err(dev, "Failed to register client: %d\n", ret);
                 goto err_drm_fb_helper_unprepare;
+       }
-       ret = drm_fb_helper_init(dev, &ifbdev->helper);
-       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);
+       drm_client_register(&ifbdev->helper.client);
-       return 0;
+       return;
-err_drm_client_release:
-       drm_client_release(&ifbdev->helper.client);
  err_drm_fb_helper_unprepare:
         drm_fb_helper_unprepare(&ifbdev->helper);
+       mutex_destroy(&ifbdev->hpd_lock);
         kfree(ifbdev);
-       return ret;
-}
-
-static void intel_fbdev_initial_config(void *data, async_cookie_t
cookie)
-{
-       struct intel_fbdev *ifbdev = data;
-
-       /* Due to peculiar init order wrt to hpd handling this is
separate. */
-       if (drm_fb_helper_initial_config(&ifbdev->helper))
-               intel_fbdev_unregister(to_i915(ifbdev->helper.dev));
-}
-
-void intel_fbdev_initial_config_async(struct drm_i915_private
*dev_priv)
-{
-       struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
-
-       if (!ifbdev)
-               return;
-
-       ifbdev->cookie = async_schedule(intel_fbdev_initial_config,
ifbdev);
-}
-
-void intel_fbdev_unregister(struct drm_i915_private *dev_priv)
-{
-       struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
-
-       if (!ifbdev)
-               return;
-
-       intel_fbdev_set_suspend(&dev_priv->drm,
FBINFO_STATE_SUSPENDED, true);
-
-       if (!current_is_async())
-               intel_fbdev_sync(ifbdev);
-
-       drm_fb_helper_unregister_info(&ifbdev->helper);
-}
-
-void intel_fbdev_fini(struct drm_i915_private *dev_priv)
-{
-       struct intel_fbdev *ifbdev = fetch_and_zero(&dev_priv-
display.fbdev.fbdev);
-
-       if (!ifbdev)
-               return;
-
-       intel_fbdev_destroy(ifbdev);
  }
 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev
*fbdev)
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.h
b/drivers/gpu/drm/i915/display/intel_fbdev.h
index 8c953f102ba22..08de2d5b34338 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.h
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.h
@@ -14,27 +14,11 @@ struct intel_fbdev;
  struct intel_framebuffer;
 #ifdef CONFIG_DRM_FBDEV_EMULATION
-int intel_fbdev_init(struct drm_device *dev);
-void intel_fbdev_initial_config_async(struct drm_i915_private
*dev_priv);
-void intel_fbdev_unregister(struct drm_i915_private *dev_priv);
-void intel_fbdev_fini(struct drm_i915_private *dev_priv);
+void intel_fbdev_setup(struct drm_i915_private *dev_priv);
  void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool
synchronous);
  struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev
*fbdev);
  #else
-static inline int intel_fbdev_init(struct drm_device *dev)
-{
-       return 0;
-}
-
-static inline void intel_fbdev_initial_config_async(struct
drm_i915_private *dev_priv)
-{
-}
-
-static inline void intel_fbdev_unregister(struct drm_i915_private
*dev_priv)
-{
-}
-
-static inline void intel_fbdev_fini(struct drm_i915_private
*dev_priv)
+static inline void intel_fbdev_setup(struct drm_i915_private
*dev_priv)
  {
  }
diff --git a/drivers/gpu/drm/i915/i915_driver.c
b/drivers/gpu/drm/i915/i915_driver.c
index 86460cd8167d1..53663c0cc3be4 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -817,6 +817,8 @@ int i915_driver_probe(struct pci_dev *pdev, const
struct pci_device_id *ent)
        i915->do_release = true; +       intel_fbdev_setup(i915);
+
         return 0;
 out_cleanup_gem:


--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

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