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 @@
} 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;