drm: omapdrm: Drop manual framebuffer pin handling

Since the removal of omap_plane_mode_set(), framebuffers are now pinned
exclusively through the plane .prepare_fb() and .cleanup_fb() operations
as the remaining callers of omap_plane_setup() don't modify the
framebuffer. Remove the manual pin/unpin infrastructure.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/omap_crtc.c

@@ -52,9 +52,6 @@ struct omap_crtc {
 	struct omap_drm_irq vblank_irq;
 	struct omap_drm_irq error_irq;
 
-	/* list of framebuffers to unpin */
-	struct list_head pending_unpins;
-
 	/* pending event */
 	struct drm_pending_vblank_event *event;
 	wait_queue_head_t flip_wait;
@@ -64,11 +61,6 @@ struct omap_crtc {
 	bool ignore_digit_sync_lost;
 };
 
-struct omap_framebuffer_unpin {
-	struct list_head list;
-	struct drm_framebuffer *fb;
-};
-
 /* -----------------------------------------------------------------------------
  * Helper Functions
  */
@@ -365,7 +357,6 @@ static void omap_crtc_vblank_irq(struct omap_drm_irq *irq, uint32_t irqstatus)
 int omap_crtc_flush(struct drm_crtc *crtc)
 {
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
-	struct omap_framebuffer_unpin *fb, *next;
 
 	DBG("%s: GO", omap_crtc->name);
 
@@ -385,29 +376,6 @@ int omap_crtc_flush(struct drm_crtc *crtc)
 
 	dispc_runtime_put();
 
-	/* Unpin and unreference pending framebuffers. */
-	list_for_each_entry_safe(fb, next, &omap_crtc->pending_unpins, list) {
-		omap_framebuffer_unpin(fb->fb);
-		drm_framebuffer_unreference(fb->fb);
-		list_del(&fb->list);
-		kfree(fb);
-	}
-
-	return 0;
-}
-
-int omap_crtc_queue_unpin(struct drm_crtc *crtc, struct drm_framebuffer *fb)
-{
-	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
-	struct omap_framebuffer_unpin *unpin;
-
-	unpin = kzalloc(sizeof(*unpin), GFP_KERNEL);
-	if (!unpin)
-		return -ENOMEM;
-
-	unpin->fb = fb;
-	list_add_tail(&unpin->list, &omap_crtc->pending_unpins);
-
 	return 0;
 }
 
@@ -643,9 +611,6 @@ struct drm_crtc *omap_crtc_init(struct drm_device *dev,
 	crtc = &omap_crtc->base;
 
 	init_waitqueue_head(&omap_crtc->flip_wait);
-
-	INIT_LIST_HEAD(&omap_crtc->pending_unpins);
-
 	init_completion(&omap_crtc->completion);
 
 	omap_crtc->channel = channel;

drivers/gpu/drm/omapdrm/omap_drv.h

@@ -143,7 +143,6 @@ void omap_fbdev_free(struct drm_device *dev);
 const struct omap_video_timings *omap_crtc_timings(struct drm_crtc *crtc);
 enum omap_channel omap_crtc_channel(struct drm_crtc *crtc);
 int omap_crtc_flush(struct drm_crtc *crtc);
-int omap_crtc_queue_unpin(struct drm_crtc *crtc, struct drm_framebuffer *fb);
 void omap_crtc_cancel_page_flip(struct drm_crtc *crtc, struct drm_file *file);
 void omap_crtc_pre_init(void);
 void omap_crtc_pre_uninit(void);

drivers/gpu/drm/omapdrm/omap_plane.c

@@ -45,49 +45,12 @@ struct omap_plane {
 	struct omap_drm_window win;
 	bool enabled;
 
-	/* last fb that we pinned: */
-	struct drm_framebuffer *pinned_fb;
-
 	uint32_t nformats;
 	uint32_t formats[32];
 
 	struct omap_drm_irq error_irq;
 };
 
-/* update which fb (if any) is pinned for scanout */
-static int omap_plane_update_pin(struct drm_plane *plane)
-{
-	struct omap_plane *omap_plane = to_omap_plane(plane);
-	struct drm_framebuffer *pinned_fb = omap_plane->pinned_fb;
-	struct drm_framebuffer *fb = omap_plane->enabled ? plane->fb : NULL;
-	int ret = 0;
-
-	if (pinned_fb == fb)
-		return 0;
-
-	DBG("%p -> %p", pinned_fb, fb);
-
-	if (fb) {
-		drm_framebuffer_reference(fb);
-		ret = omap_framebuffer_pin(fb);
-	}
-
-	if (pinned_fb)
-		omap_crtc_queue_unpin(plane->crtc, pinned_fb);
-
-	if (ret) {
-		dev_err(plane->dev->dev, "could not swap %p -> %p\n",
-				omap_plane->pinned_fb, fb);
-		drm_framebuffer_unreference(fb);
-		omap_plane->pinned_fb = NULL;
-		return ret;
-	}
-
-	omap_plane->pinned_fb = fb;
-
-	return 0;
-}
-
 static int __omap_plane_setup(struct omap_plane *omap_plane,
 			      struct drm_crtc *crtc,
 			      struct drm_framebuffer *fb)
@@ -133,10 +96,6 @@ static int omap_plane_setup(struct omap_plane *omap_plane)
 	struct drm_plane *plane = &omap_plane->base;
 	int ret;
 
-	ret = omap_plane_update_pin(plane);
-	if (ret < 0)
-		return ret;
-
 	dispc_runtime_get();
 	ret = __omap_plane_setup(omap_plane, plane->crtc, plane->fb);
 	dispc_runtime_put();