patches.baytrail/1025-drm-i915-Don-t-lie-about-findind-suitable-PLL-settin.patch

From b9b0cd5eed925a46ed8e4a952cd7fe47c8788e90 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Tue, 24 Sep 2013 21:26:31 +0300
Subject: drm/i915: Don't lie about findind suitable PLL settings on VLV
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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>
(cherry picked from commit 49e497ef43e06dbf65e0a3637bcaedb31ce17d34)
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ed05713b54b7..bda31bf68a8f 100644
--- 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)
-- 
1.8.5.rc3