drm/i915/fb: add intel_framebuffer_alloc()

Add intel_framebuffer_alloc() to hide intel_bo_alloc_framebuffer(), as
that doesn't feel like the correct abstraction.

Cc: Jocelyn Falempe <[e-mail]>
Cc: Maarten Lankhorst <[e-mail]>
Signed-off-by: Jani Nikula <[e-mail]>
Reviewed-by: Jocelyn Falempe <[e-mail]>
Link: https://lore.kernel.org/r/379[e-mail]

drivers/gpu/drm/i915/display/i9xx_plane.c

···
 #include "i9xx_plane.h"
 #include "i9xx_plane_regs.h"
 #include "intel_atomic.h"
-#include "intel_bo.h"
 #include "intel_de.h"
 #include "intel_display_irq.h"
 #include "intel_display_regs.h"
···
 
 	drm_WARN_ON(display->drm, pipe != crtc->pipe);
 
-	intel_fb = intel_bo_alloc_framebuffer();
+	intel_fb = intel_framebuffer_alloc();
 	if (!intel_fb) {
 		drm_dbg_kms(display->drm, "failed to alloc fb\n");
 		return;

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

···
 	return fb;
 }
 
+struct intel_framebuffer *intel_framebuffer_alloc(void)
+{
+	return intel_bo_alloc_framebuffer();
+}
+
 struct drm_framebuffer *
 intel_framebuffer_create(struct drm_gem_object *obj,
 			 struct drm_mode_fb_cmd2 *mode_cmd)
···
 	struct intel_framebuffer *intel_fb;
 	int ret;
 
-	intel_fb = intel_bo_alloc_framebuffer();
+	intel_fb = intel_framebuffer_alloc();
 	if (!intel_fb)
 		return ERR_PTR(-ENOMEM);
 

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

···
 int intel_framebuffer_init(struct intel_framebuffer *ifb,
 			   struct drm_gem_object *obj,
 			   struct drm_mode_fb_cmd2 *mode_cmd);
+
+struct intel_framebuffer *intel_framebuffer_alloc(void);
+
 struct drm_framebuffer *
 intel_framebuffer_create(struct drm_gem_object *obj,
 			 struct drm_mode_fb_cmd2 *mode_cmd);

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

···
 		return;
 	}
 
-	intel_fb = intel_bo_alloc_framebuffer();
+	intel_fb = intel_framebuffer_alloc();
 	if (!intel_fb) {
 		drm_dbg_kms(display->drm, "failed to alloc fb\n");
 		return;