drm/i915: Respect VBT seamless DRRS min refresh rate

Make sure our choice of downclock mode respects the VBT
seameless DRRS min refresh rate limit.

v2: s/vrefesh/vrefresh/ (Jani)

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220504150440.13748-10-ville.syrjala@linux.intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c
index 03398fe..d1d1b59 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -75,13 +75,17 @@ const struct drm_display_mode *
 intel_panel_downclock_mode(struct intel_connector *connector,
                           const struct drm_display_mode *adjusted_mode)
 {
+       struct drm_i915_private *i915 = to_i915(connector->base.dev);
        const struct drm_display_mode *fixed_mode, *best_mode = NULL;
-       int vrefresh = drm_mode_vrefresh(adjusted_mode);
+       int min_vrefresh = i915->vbt.seamless_drrs_min_refresh_rate;
+       int max_vrefresh = drm_mode_vrefresh(adjusted_mode);
 
        /* pick the fixed_mode with the lowest refresh rate */
        list_for_each_entry(fixed_mode, &connector->panel.fixed_modes, head) {
-               if (drm_mode_vrefresh(fixed_mode) < vrefresh) {
-                       vrefresh = drm_mode_vrefresh(fixed_mode);
+               int vrefresh = drm_mode_vrefresh(fixed_mode);
+
+               if (vrefresh >= min_vrefresh && vrefresh < max_vrefresh) {
+                       max_vrefresh = vrefresh;
                        best_mode = fixed_mode;
                }
        }