drm/i915: Don't lie about findind suitable PLL settings on VLV

If vlv_find_best_dpll() couldn't find suitable PLL settings,
just say so instead of lying to caller.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 1ea6d49..0e87970 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -662,6 +662,7 @@ vlv_find_best_dpll(const intel_limit_t *limit, struct drm_crtc *crtc,
        unsigned int bestppm = 1000000;
        /* min update 19.2 MHz */
        int max_n = min(limit->n.max, refclk / 19200);
+       bool found = false;
 
        target *= 5; /* fast clock */
 
@@ -692,18 +693,20 @@ vlv_find_best_dpll(const intel_limit_t *limit, struct drm_crtc *crtc,
                                        if (ppm < 100 && clock.p > best_clock->p) {
                                                bestppm = 0;
                                                *best_clock = clock;
+                                               found = true;
                                        }
 
                                        if (bestppm >= 10 && ppm < bestppm - 10) {
                                                bestppm = ppm;
                                                *best_clock = clock;
+                                               found = true;
                                        }
                                }
                        }
                }
        }
 
-       return true;
+       return found;
 }
 
 bool intel_crtc_active(struct drm_crtc *crtc)