diff options
Diffstat (limited to 'drivers/gpu/drm/drm_modes.c')
| -rw-r--r-- | drivers/gpu/drm/drm_modes.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index ab6e70eadc58..49404ce1666e 100644 --- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -566,7 +566,9 @@ EXPORT_SYMBOL(drm_mode_height); * FIXME: why is this needed? shouldn't vrefresh be set already? * * RETURNS: - * Vertical refresh rate of @mode x 1000. For precision reasons. + * Vertical refresh rate. It will be the result of actual value plus 0.5. + * If it is 70.288, it will return 70Hz. + * If it is 59.6, it will return 60Hz. */ int drm_mode_vrefresh(struct drm_display_mode *mode) { @@ -576,14 +578,13 @@ int drm_mode_vrefresh(struct drm_display_mode *mode) 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; - calc_val *= 1000; - calc_val /= mode->vtotal; + refresh = (calc_val + vtotal / 2) / vtotal; - refresh = calc_val; if (mode->flags & DRM_MODE_FLAG_INTERLACE) refresh *= 2; if (mode->flags & DRM_MODE_FLAG_DBLSCAN) |