3.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deuc...@amd.com>

commit d8e24525094200601236fa64a54cf73e3d682f2e upstream.

Seems to cause problems with certain DP monitors.

Bug:
https://bugs.freedesktop.org/show_bug.cgi?id=40699

Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/gpu/drm/radeon/atombios_crtc.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -938,11 +938,14 @@ static bool atombios_crtc_prepare_pll(st
                                                        
radeon_atombios_get_ppll_ss_info(rdev,
                                                                                
         &radeon_crtc->ss,
                                                                                
         ATOM_DP_SS_ID1);
-                               } else
+                               } else {
                                        radeon_crtc->ss_enabled =
                                                
radeon_atombios_get_ppll_ss_info(rdev,
                                                                                
 &radeon_crtc->ss,
                                                                                
 ATOM_DP_SS_ID1);
+                               }
+                               /* disable spread spectrum on DCE3 DP */
+                               radeon_crtc->ss_enabled = false;
                        }
                        break;
                case ATOM_ENCODER_MODE_LVDS:


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