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| author | Paulo Zanoni <paulo.r.zanoni@intel.com> | 2013-05-04 00:23:40 +0400 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-05-21 13:26:52 +0400 |
| commit | eaa591ec528ad75bb4c77606c5cb671f05e04db6 (patch) | |
| tree | 3021f454514d44379ecf9f9b5d57c24341f64b36 /drivers/gpu/drm/i915/intel_pm.c | |
| parent | 7366937312d4e406539b1cf70e1562358bdd560e (diff) | |
| download | linux-eaa591ec528ad75bb4c77606c5cb671f05e04db6.tar.xz | |
drm/i915: fix haswell linetime watermarks calculation
Move the "*8" calculation to the left side so we don't propagate
rounding errors. Also use DIV_ROUND_CLOSEST because that's what the
spec says we need to do.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_pm.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_pm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 198d9c9ada68..2c406ddc6354 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -2093,7 +2093,7 @@ haswell_update_linetime_wm(struct drm_device *dev, struct drm_crtc *crtc) * row at the given clock rate, multiplied by 8. * */ temp |= PIPE_WM_LINETIME_TIME( - ((mode->htotal * 1000) / mode->clock) * 8); + DIV_ROUND_CLOSEST(mode->htotal * 1000 * 8, mode->clock)); /* IPS watermarks are only used by pipe A, and are ignored by * pipes B and C. They are calculated similarly to the common |