| From cb0e093162d7b6589c2217a00e2abfef686b32d6 Mon Sep 17 00:00:00 2001 |
| From: Jesse Barnes <jbarnes@virtuousgeek.org> |
| Date: Thu, 28 Jul 2011 14:50:30 -0700 |
| Subject: drm/i915: fix CB tuning check for ILK+ |
| |
| From: Jesse Barnes <jbarnes@virtuousgeek.org> |
| |
| commit cb0e093162d7b6589c2217a00e2abfef686b32d6 upstream. |
| |
| 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> |
| Signed-off-by: Timo Aaltonen <timo@canonical.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> |
| |
| --- |
| drivers/gpu/drm/i915/intel_display.c | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/drivers/gpu/drm/i915/intel_display.c |
| +++ b/drivers/gpu/drm/i915/intel_display.c |
| @@ -4972,7 +4972,7 @@ static int ironlake_crtc_mode_set(struct |
| } 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; |
