commit cb0e093162d7b6589c2217a00e2abfef686b32d6
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Thu Jul 28 14:50:30 2011 -0700

    drm/i915: fix CB tuning check for ILK+
    
    CB tuning is needed to handle potential process variations that might
    cause clock jitter for certain PLL settings.  However, we were setting
    it incorrectly since we were using the wrong M value as a check (M1 when
    we needed to use the whole M value).  Fix it up, making my HDMI
    attached display a little prettier (used to have occasional dots crawl
    across the display).
    
    Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
    Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8f7ed73..32c8c95 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4994,7 +4994,7 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
 	} else if (is_sdvo && is_tv)
 		factor = 20;
 
-	if (clock.m1 < factor * clock.n)
+	if (clock.m < factor * clock.n)
 		fp |= FP_CB_TUNE;
 
 	dpll = 0;