[PATCH 1/2] drm/i915/intel_panel: Add a helper to get the highest refresh rate mode

[Ankit Nautiyal <ankit.k.nautiyal@intel.com>]

Introduce a helper intel_panel_highest_vrefresh_mode() to get the
highest refresh rate mode from the list of fixed modes for a connector.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
---
 drivers/gpu/drm/i915/display/intel_panel.c | 15 +++++++++++++++
 drivers/gpu/drm/i915/display/intel_panel.h |  2 ++
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c
index 2a20aaaaac39..5e918ee0c8ea 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -158,6 +158,21 @@ intel_panel_highest_mode(struct intel_connector *connector,
 	return best_mode;
 }
 
+const struct drm_display_mode *
+intel_panel_highest_vrefresh_mode(struct intel_connector *connector)
+{
+	const struct drm_display_mode *fixed_mode, *best_mode = NULL;
+
+	/* pick the fixed_mode that has the highest vrefresh */
+	list_for_each_entry(fixed_mode, &connector->panel.fixed_modes, head) {
+		if (!best_mode ||
+		    drm_mode_vrefresh(fixed_mode) > drm_mode_vrefresh(best_mode))
+			best_mode = fixed_mode;
+	}
+
+	return best_mode;
+}
+
 int intel_panel_get_modes(struct intel_connector *connector)
 {
 	const struct drm_display_mode *fixed_mode;
diff --git a/drivers/gpu/drm/i915/display/intel_panel.h b/drivers/gpu/drm/i915/display/intel_panel.h
index 56a6412cf0fb..2f7a317995ea 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.h
+++ b/drivers/gpu/drm/i915/display/intel_panel.h
@@ -39,6 +39,8 @@ intel_panel_downclock_mode(struct intel_connector *connector,
 const struct drm_display_mode *
 intel_panel_highest_mode(struct intel_connector *connector,
 			 const struct drm_display_mode *adjusted_mode);
+const struct drm_display_mode *
+intel_panel_highest_vrefresh_mode(struct intel_connector *connector);
 int intel_panel_get_modes(struct intel_connector *connector);
 enum drrs_type intel_panel_drrs_type(struct intel_connector *connector);
 enum drm_mode_status
-- 
2.45.2