drm/i915: Change intel_fbdev_fb_alloc() return type

Change intel_fbdev_fb_alloc() to return struct intel_fb instead
of struct drm_framebuffer. Let's us eliminate some annoying
aliasing variables in the fbdev setup code.

v2: Assing the results to the correct variable (Jani)
    Fix xe's copy
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240510102233.25057-1-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Lucas De Marchi <lucas.demarchi@intel.com>

drivers/gpu/drm/i915/display/intel_fbdev.c

@@ -207,13 +207,12 @@ static int intelfb_create(struct drm_fb_helper *helper,
 		intel_fb = ifbdev->fb = NULL;
 	}
 	if (!intel_fb || drm_WARN_ON(dev, !intel_fb_obj(&intel_fb->base))) {
-		struct drm_framebuffer *fb;
 		drm_dbg_kms(&dev_priv->drm,
 			    "no BIOS fb, allocating a new one\n");
-		fb = intel_fbdev_fb_alloc(helper, sizes);
-		if (IS_ERR(fb))
-			return PTR_ERR(fb);
-		intel_fb = ifbdev->fb = to_intel_framebuffer(fb);
+		intel_fb = intel_fbdev_fb_alloc(helper, sizes);
+		if (IS_ERR(intel_fb))
+			return PTR_ERR(intel_fb);
+		ifbdev->fb = intel_fb;
 	} else {
 		drm_dbg_kms(&dev_priv->drm, "re-using BIOS fb\n");
 		prealloc = true;

drivers/gpu/drm/i915/display/intel_fbdev_fb.c

@@ -11,7 +11,7 @@
 #include "intel_display_types.h"
 #include "intel_fbdev_fb.h"
 
-struct drm_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper,
+struct intel_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper,
 					       struct drm_fb_helper_surface_size *sizes)
 {
 	struct drm_framebuffer *fb;
@@ -63,7 +63,7 @@ struct drm_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper,
 	fb = intel_framebuffer_create(obj, &mode_cmd);
 	i915_gem_object_put(obj);
 
-	return fb;
+	return to_intel_framebuffer(fb);
 }
 
 int intel_fbdev_fb_fill_info(struct drm_i915_private *i915, struct fb_info *info,

drivers/gpu/drm/i915/display/intel_fbdev_fb.h

@@ -13,7 +13,7 @@ struct drm_i915_private;
 struct fb_info;
 struct i915_vma;
 
-struct drm_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper,
+struct intel_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper,
 					       struct drm_fb_helper_surface_size *sizes);
 int intel_fbdev_fb_fill_info(struct drm_i915_private *i915, struct fb_info *info,
 			     struct drm_i915_gem_object *obj, struct i915_vma *vma);

drivers/gpu/drm/xe/display/intel_fbdev_fb.c

@@ -13,7 +13,7 @@
 #include "i915_drv.h"
 #include "intel_display_types.h"
 
-struct drm_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper,
+struct intel_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper,
 					       struct drm_fb_helper_surface_size *sizes)
 {
 	struct drm_framebuffer *fb;
@@ -70,10 +70,11 @@ struct drm_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper,
 	}
 
 	drm_gem_object_put(intel_bo_to_drm_bo(obj));
-	return fb;
+
+	return to_intel_framebuffer(fb);
 
 err:
-	return fb;
+	return ERR_CAST(fb);
 }
 
 int intel_fbdev_fb_fill_info(struct drm_i915_private *i915, struct fb_info *info,