Commit cb0e0931 authored Jul 28, 2011 by Jesse Barnes Committed by Keith Packard Jul 28, 2011

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>

parent d74362c9

drivers/gpu/drm/i915/intel_display.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;