diff options
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_modes.c | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index 4157250140b0..f6b7c0e36a1a 100644 --- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -773,24 +773,23 @@ EXPORT_SYMBOL(drm_mode_hsync); int drm_mode_vrefresh(const struct drm_display_mode *mode) { int refresh = 0; - unsigned int calc_val; if (mode->vrefresh > 0) refresh = mode->vrefresh; else if (mode->htotal > 0 && mode->vtotal > 0) { - int vtotal; - vtotal = mode->vtotal; - /* work out vrefresh the value will be x1000 */ - calc_val = (mode->clock * 1000); - calc_val /= mode->htotal; - refresh = (calc_val + vtotal / 2) / vtotal; + unsigned int num, den; + + num = mode->clock * 1000; + den = mode->htotal * mode->vtotal; if (mode->flags & DRM_MODE_FLAG_INTERLACE) - refresh *= 2; + num *= 2; if (mode->flags & DRM_MODE_FLAG_DBLSCAN) - refresh /= 2; + den *= 2; if (mode->vscan > 1) - refresh /= mode->vscan; + den *= mode->vscan; + + refresh = DIV_ROUND_CLOSEST(num, den); } return refresh; } |