[PATCH 6/7] drm/i915/panel: Add helper to get highest fixed mode

[Ankit Nautiyal]

Add intel_panel_highest_fixed_mode() to return the fixed mode with the
highest pixel clock. Unlike intel_panel_highest_mode(), this function
does not fall back to the adjusted mode and returns NULL if no fixed
modes are available.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_panel.c | 13 +++++++++++++
 drivers/gpu/drm/i915/display/intel_panel.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c
index 2a20aaaaac39..ea4351d11e63 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -158,6 +158,19 @@ intel_panel_highest_mode(struct intel_connector *connector,
 	return best_mode;
 }
 
+const struct drm_display_mode *
+intel_panel_highest_fixed_mode(struct intel_connector *connector)
+{
+	const struct drm_display_mode *fixed_mode, *highest_mode = NULL;
+
+	list_for_each_entry(fixed_mode, &connector->panel.fixed_modes, head) {
+		if (!highest_mode || fixed_mode->clock > highest_mode->clock)
+			highest_mode = fixed_mode;
+	}
+
+	return highest_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..60f6873cdbaa 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_fixed_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