drm/armada: only enable HSMOOTH if scaling horizontally

Only enable the HSMOOTH control bit if we are scaling horizontally,
otherwise it makes no sense to enable the horizontal scaler.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

drivers/gpu/drm/armada/armada_crtc.c

@@ -583,7 +583,8 @@ static void armada_drm_primary_set(struct drm_crtc *crtc,
 	armada_reg_queue_mod(regs, i, ctrl0, CFG_GRAFORMAT |
 			     CFG_GRA_MOD(CFG_SWAPRB | CFG_SWAPUV |
 					 CFG_SWAPYU | CFG_YUV2RGB) |
-			     CFG_PALETTE_ENA | CFG_GRA_FTOGGLE,
+			     CFG_PALETTE_ENA | CFG_GRA_FTOGGLE |
+			     CFG_GRA_HSMOOTH | CFG_GRA_ENA,
 			     LCD_SPU_DMA_CTRL0);
 	armada_reg_queue_end(regs, i);
 	armada_drm_crtc_update_regs(dcrtc, regs);
@@ -605,7 +606,7 @@ static int armada_drm_crtc_mode_set(struct drm_crtc *crtc,
 
 	interlaced = !!(adj->flags & DRM_MODE_FLAG_INTERLACE);
 
-	val = CFG_GRA_ENA | CFG_GRA_HSMOOTH;
+	val = CFG_GRA_ENA;
 	val |= CFG_GRA_FMT(drm_fb_to_armada_fb(dcrtc->crtc.primary->fb)->fmt);
 	val |= CFG_GRA_MOD(drm_fb_to_armada_fb(dcrtc->crtc.primary->fb)->mod);
 

drivers/gpu/drm/armada/armada_overlay.c

@@ -120,11 +120,11 @@ armada_ovl_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
 
 	ctrl0 = CFG_DMA_FMT(drm_fb_to_armada_fb(fb)->fmt) |
 		CFG_DMA_MOD(drm_fb_to_armada_fb(fb)->mod) |
-		CFG_CBSH_ENA | CFG_DMA_HSMOOTH | CFG_DMA_ENA;
-
-	/* Does the position/size result in nothing to display? */
-	if (!visible)
-		ctrl0 &= ~CFG_DMA_ENA;
+		CFG_CBSH_ENA;
+	if (visible)
+		ctrl0 |= CFG_DMA_ENA;
+	if (drm_rect_width(&src) >> 16 != drm_rect_width(&dest))
+		ctrl0 |= CFG_DMA_HSMOOTH;
 
 	/*
 	 * Shifting a YUV packed format image by one pixel causes the U/V