diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index dd9fdf5..0c67669 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -353,12 +353,55 @@
 	atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 }
 
+static void atombios_disable_ss(struct drm_crtc *crtc)
+{
+	struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
+	struct drm_device *dev = crtc->dev;
+	struct radeon_device *rdev = dev->dev_private;
+	u32 ss_cntl;
+
+	if (ASIC_IS_DCE4(rdev)) {
+		switch (radeon_crtc->pll_id) {
+		case ATOM_PPLL1:
+			ss_cntl = RREG32(EVERGREEN_P1PLL_SS_CNTL);
+			ss_cntl &= ~EVERGREEN_PxPLL_SS_EN;
+			WREG32(EVERGREEN_P1PLL_SS_CNTL, ss_cntl);
+			break;
+		case ATOM_PPLL2:
+			ss_cntl = RREG32(EVERGREEN_P2PLL_SS_CNTL);
+			ss_cntl &= ~EVERGREEN_PxPLL_SS_EN;
+			WREG32(EVERGREEN_P2PLL_SS_CNTL, ss_cntl);
+			break;
+		case ATOM_DCPLL:
+		case ATOM_PPLL_INVALID:
+			return;
+		}
+	} else if (ASIC_IS_AVIVO(rdev)) {
+		switch (radeon_crtc->pll_id) {
+		case ATOM_PPLL1:
+			ss_cntl = RREG32(AVIVO_P1PLL_INT_SS_CNTL);
+			ss_cntl &= ~1;
+			WREG32(AVIVO_P1PLL_INT_SS_CNTL, ss_cntl);
+			break;
+		case ATOM_PPLL2:
+			ss_cntl = RREG32(AVIVO_P2PLL_INT_SS_CNTL);
+			ss_cntl &= ~1;
+			WREG32(AVIVO_P2PLL_INT_SS_CNTL, ss_cntl);
+			break;
+		case ATOM_DCPLL:
+		case ATOM_PPLL_INVALID:
+			return;
+		}
+	}
+}
+
+
 union atom_enable_ss {
 	ENABLE_LVDS_SS_PARAMETERS legacy;
 	ENABLE_SPREAD_SPECTRUM_ON_PPLL_PS_ALLOCATION v1;
 };
 
-static void atombios_set_ss(struct drm_crtc *crtc, int enable)
+static void atombios_enable_ss(struct drm_crtc *crtc)
 {
 	struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
 	struct drm_device *dev = crtc->dev;
@@ -387,9 +430,9 @@
 					step = dig->ss->step;
 					delay = dig->ss->delay;
 					range = dig->ss->range;
-				} else if (enable)
+				} else
 					return;
-			} else if (enable)
+			} else
 				return;
 			break;
 		}
@@ -406,13 +449,13 @@
 		args.v1.ucSpreadSpectrumDelay = delay;
 		args.v1.ucSpreadSpectrumRange = range;
 		args.v1.ucPpll = radeon_crtc->crtc_id ? ATOM_PPLL2 : ATOM_PPLL1;
-		args.v1.ucEnable = enable;
+		args.v1.ucEnable = ATOM_ENABLE;
 	} else {
 		args.legacy.usSpreadSpectrumPercentage = cpu_to_le16(percentage);
 		args.legacy.ucSpreadSpectrumType = type;
 		args.legacy.ucSpreadSpectrumStepSize_Delay = (step & 3) << 2;
 		args.legacy.ucSpreadSpectrumStepSize_Delay |= (delay & 7) << 4;
-		args.legacy.ucEnable = enable;
+		args.legacy.ucEnable = ATOM_ENABLE;
 	}
 	atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 }
@@ -1086,12 +1129,12 @@
 	/* pick pll */
 	radeon_crtc->pll_id = radeon_atom_pick_pll(crtc);
 
-	atombios_set_ss(crtc, 0);
+	atombios_disable_ss(crtc);
 	/* always set DCPLL */
 	if (ASIC_IS_DCE4(rdev))
 		atombios_crtc_set_dcpll(crtc);
 	atombios_crtc_set_pll(crtc, adjusted_mode);
-	atombios_set_ss(crtc, 1);
+	atombios_enable_ss(crtc);
 
 	if (ASIC_IS_DCE4(rdev))
 		atombios_set_crtc_dtd_timing(crtc, adjusted_mode);