redonkable/alistair23-linux
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drm/i915: fix CB tuning check for ILK+

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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>
This commit is contained in:
Jesse Barnes 2011-07-28 14:50:30 -07:00 committed by Keith Packard
parent d74362c9e4
commit cb0e093162
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_display.c
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@ -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;