drm/gma500: Remove struct psb_gem_object.npage

Calculate the number of pages in the BO's backing storage from
the size. Remove the npage field.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220308195222.13471-2-tzimmermann@suse.de

drivers/gpu/drm/gma500/gem.c

@@ -51,7 +51,6 @@ int psb_gem_pin(struct psb_gem_object *pobj)
 			     (gpu_base + pobj->offset), npages, 0, 0,
 			     PSB_MMU_CACHED_MEMORY);
 
-	pobj->npage = npages;
 	pobj->pages = pages;
 
 out:
@@ -71,6 +70,7 @@ void psb_gem_unpin(struct psb_gem_object *pobj)
 	struct drm_device *dev = obj->dev;
 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 	u32 gpu_base = dev_priv->gtt.gatt_start;
+	unsigned long npages;
 
 	mutex_lock(&dev_priv->gtt_mutex);
 
@@ -81,16 +81,17 @@ void psb_gem_unpin(struct psb_gem_object *pobj)
 	if (pobj->in_gart || pobj->stolen)
 		goto out;
 
+	npages = obj->size / PAGE_SIZE;
+
 	psb_mmu_remove_pages(psb_mmu_get_default_pd(dev_priv->mmu),
-			     (gpu_base + pobj->offset), pobj->npage, 0, 0);
+			     (gpu_base + pobj->offset), npages, 0, 0);
 	psb_gtt_remove_pages(dev_priv, &pobj->resource);
 
 	/* Reset caching flags */
-	set_pages_array_wb(pobj->pages, pobj->npage);
+	set_pages_array_wb(pobj->pages, npages);
 
 	drm_gem_put_pages(obj, pobj->pages, true, false);
 	pobj->pages = NULL;
-	pobj->npage = 0;
 
 out:
 	mutex_unlock(&dev_priv->gtt_mutex);

drivers/gpu/drm/gma500/gem.h

@@ -23,7 +23,6 @@ struct psb_gem_object {
 	bool stolen;			/* Backed from stolen RAM */
 	bool mmapping;			/* Is mmappable */
 	struct page **pages;		/* Backing pages if present */
-	int npage;			/* Number of backing pages */
 };
 
 static inline struct psb_gem_object *to_psb_gem_object(struct drm_gem_object *obj)

drivers/gpu/drm/gma500/gma_display.c

@@ -391,11 +391,9 @@ int gma_crtc_cursor_set(struct drm_crtc *crtc,
 			goto unref_cursor;
 		}
 
-		/* Prevent overflow */
-		if (pobj->npage > 4)
-			cursor_pages = 4;
-		else
-			cursor_pages = pobj->npage;
+		cursor_pages = obj->size / PAGE_SIZE;
+		if (cursor_pages > 4)
+			cursor_pages = 4; /* Prevent overflow */
 
 		/* Copy the cursor to cursor mem */
 		tmp_dst = dev_priv->vram_addr + cursor_pobj->offset;