drm/i915/bios: Parse the seamless DRRS min refresh rate

Extract the seamless DRRS min refresh rate from the VBT.

v2: Do a version check
Reviewed-by: NJani Nikula <jani.nikula@intel.com>
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220504150440.13748-9-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/display/intel_bios.c

@@ -761,6 +761,7 @@ parse_lfp_data(struct drm_i915_private *i915)
 	const struct bdb_lvds_lfp_data *data;
 	const struct bdb_lvds_lfp_data_tail *tail;
 	const struct bdb_lvds_lfp_data_ptrs *ptrs;
+	int panel_type = i915->vbt.panel_type;
 
 	ptrs = find_section(i915, BDB_LVDS_LFP_DATA_PTRS);
 	if (!ptrs)
@@ -777,7 +778,13 @@ parse_lfp_data(struct drm_i915_private *i915)
 	if (!tail)
 		return;
 
-	(void)tail;
+	if (i915->vbt.version >= 188) {
+		i915->vbt.seamless_drrs_min_refresh_rate =
+			tail->seamless_drrs_min_refresh_rate[panel_type];
+		drm_dbg_kms(&i915->drm,
+			    "Seamless DRRS min refresh rate: %d Hz\n",
+			    i915->vbt.seamless_drrs_min_refresh_rate);
+	}
 }
 
 static void

drivers/gpu/drm/i915/i915_drv.h

@@ -326,6 +326,7 @@ struct intel_vbt_data {
 	bool override_afc_startup;
 	u8 override_afc_startup_val;
 
+	u8 seamless_drrs_min_refresh_rate;
 	enum drrs_type drrs_type;
 
 	struct {