drm/armada: re-organise overlay register update generation

Re-organise overlay register generation so that we do not have to wait
for the previous update to complete while creating the new state.  This
allows the update to be fully prepared before queueing it for the next
interrupt.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

drivers/gpu/drm/armada/armada_overlay.c

@@ -136,43 +136,18 @@ armada_ovl_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
 	if (format->num_planes == 1 && state.src.x1 >> 16 & (format->hsub - 1))
 		ctrl0 ^= CFG_DMA_MOD(CFG_SWAPUV);
 
-	fb_changed = plane->fb != fb ||
-		     dplane->base.state.src_x != state.src.x1 >> 16 ||
-	             dplane->base.state.src_y != state.src.y1 >> 16;
-
-	/* FIXME: overlay on an interlaced display */
-	/* Just updating the position/size? */
-	if (!fb_changed && dplane->base.state.ctrl0 == ctrl0) {
-		val = (drm_rect_height(&state.src) & 0xffff0000) |
-		       drm_rect_width(&state.src) >> 16;
-		dplane->base.state.src_hw = val;
-		writel_relaxed(val, dcrtc->base + LCD_SPU_DMA_HPXL_VLN);
-
-		val = drm_rect_height(&state.dst) << 16 |
-		      drm_rect_width(&state.dst);
-		dplane->base.state.dst_hw = val;
-		writel_relaxed(val, dcrtc->base + LCD_SPU_DZM_HPXL_VLN);
-
-		val = state.dst.y1 << 16 | state.dst.x1;
-		dplane->base.state.dst_yx = val;
-		writel_relaxed(val, dcrtc->base + LCD_SPU_DMA_OVSA_HPXL_VLN);
-
-		return 0;
-	} else if (~dplane->base.state.ctrl0 & ctrl0 & CFG_DMA_ENA) {
+	if (~dplane->base.state.ctrl0 & ctrl0 & CFG_DMA_ENA) {
 		/* Power up the Y/U/V FIFOs on ENA 0->1 transitions */
 		armada_reg_queue_mod(work->regs, idx,
 				     0, CFG_PDWN16x66 | CFG_PDWN32x66,
 				     LCD_SPU_SRAM_PARA1);
 	}
 
-	if (armada_drm_plane_work_wait(&dplane->base, HZ / 25) == 0)
-		armada_drm_plane_work_cancel(dcrtc, &dplane->base);
-
-	if (!dcrtc->plane) {
-		dcrtc->plane = plane;
-		armada_ovl_update_attr(&dplane->prop, dcrtc);
-	}
+	fb_changed = plane->fb != fb ||
+		     dplane->base.state.src_x != state.src.x1 >> 16 ||
+	             dplane->base.state.src_y != state.src.y1 >> 16;
 
+	/* FIXME: overlay on an interlaced display */
 	if (fb_changed) {
 		u32 addrs[3];
 
@@ -243,6 +218,23 @@ armada_ovl_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
 			CFG_YUV2RGB) | CFG_DMA_ENA,
 			LCD_SPU_DMA_CTRL0);
 	}
+
+	/* Just updating the position/size? */
+	if (!fb_changed && dplane->base.state.ctrl0 == ctrl0) {
+		armada_reg_queue_end(work->regs, idx);
+		armada_ovl_plane_work(dcrtc, work);
+		return 0;
+	}
+
+	/* Wait for pending work to complete */
+	if (armada_drm_plane_work_wait(&dplane->base, HZ / 25) == 0)
+		armada_drm_plane_work_cancel(dcrtc, &dplane->base);
+
+	if (!dcrtc->plane) {
+		dcrtc->plane = plane;
+		armada_ovl_update_attr(&dplane->prop, dcrtc);
+	}
+
 	if (idx) {
 		armada_reg_queue_end(work->regs, idx);
 		/* Queue it for update on the next interrupt if we are enabled */