diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_panel.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_panel.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c index 77c1ca387de0..a0c8e43db5eb 100644 --- a/drivers/gpu/drm/i915/display/intel_panel.c +++ b/drivers/gpu/drm/i915/display/intel_panel.c @@ -53,6 +53,21 @@ int intel_panel_compute_config(struct intel_connector *connector, if (!fixed_mode) return 0; + /* + * We don't want to lie too much to the user about the refresh + * rate they're going to get. But we have to allow a bit of latitude + * for Xorg since it likes to automagically cook up modes with slightly + * off refresh rates. + */ + if (abs(drm_mode_vrefresh(adjusted_mode) - drm_mode_vrefresh(fixed_mode)) > 1) { + drm_dbg_kms(connector->base.dev, + "[CONNECTOR:%d:%s] Requested mode vrefresh (%d Hz) does not match fixed mode vrefresh (%d Hz)\n", + connector->base.base.id, connector->base.name, + drm_mode_vrefresh(adjusted_mode), drm_mode_vrefresh(fixed_mode)); + + return -EINVAL; + } + drm_mode_copy(adjusted_mode, fixed_mode); drm_mode_set_crtcinfo(adjusted_mode, 0); |