drm/i915/vbt: Parse power conservation features block

From VBT 228+ this is block that PSR and other power saving
features configuration should be read from.

v3:
Using DRRS from this new block

v4:
Using BIT()
Fixing DRRS comment in parse_power_conservation_features()

Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191128014852.214135-5-jose.souza@intel.com

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

@@ -659,6 +659,7 @@ parse_driver_features(struct drm_i915_private *dev_priv,
 			dev_priv->vbt.int_lvds_support = 0;
 	}
 
+	if (bdb->version < 228) {
 		DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled);
 		/*
 		 * If DRRS is not supported, drrs_type has to be set to 0.
@@ -668,7 +669,35 @@ parse_driver_features(struct drm_i915_private *dev_priv,
 		 */
 		if (!driver->drrs_enabled)
 			dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
+
 		dev_priv->vbt.psr.enable = driver->psr_enabled;
+	}
+}
+
+static void
+parse_power_conservation_features(struct drm_i915_private *dev_priv,
+				  const struct bdb_header *bdb)
+{
+	const struct bdb_lfp_power *power;
+	u8 panel_type = dev_priv->vbt.panel_type;
+
+	if (bdb->version < 228)
+		return;
+
+	power = find_section(bdb, BDB_LVDS_POWER);
+	if (!power)
+		return;
+
+	dev_priv->vbt.psr.enable = power->psr & BIT(panel_type);
+
+	/*
+	 * If DRRS is not supported, drrs_type has to be set to 0.
+	 * This is because, VBT is configured in such a way that
+	 * static DRRS is 0 and DRRS not supported is represented by
+	 * power->drrs & BIT(panel_type)=false
+	 */
+	if (!(power->drrs & BIT(panel_type)))
+		dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
 }
 
 static void
@@ -1973,6 +2002,7 @@ void intel_bios_init(struct drm_i915_private *dev_priv)
 	parse_lfp_backlight(dev_priv, bdb);
 	parse_sdvo_panel_data(dev_priv, bdb);
 	parse_driver_features(dev_priv, bdb);
+	parse_power_conservation_features(dev_priv, bdb);
 	parse_edp(dev_priv, bdb);
 	parse_psr(dev_priv, bdb);
 	parse_mipi_config(dev_priv, bdb);

drivers/gpu/drm/i915/display/intel_vbt_defs.h

@@ -793,6 +793,35 @@ struct bdb_lfp_backlight_data {
 	struct lfp_backlight_control_method backlight_control[16];
 } __packed;
 
+/*
+ * Block 44 - LFP Power Conservation Features Block
+ */
+
+struct als_data_entry {
+	u16 backlight_adjust;
+	u16 lux;
+} __packed;
+
+struct agressiveness_profile_entry {
+	u8 dpst_agressiveness : 4;
+	u8 lace_agressiveness : 4;
+} __packed;
+
+struct bdb_lfp_power {
+	u8 lfp_feature_bits;
+	struct als_data_entry als[5];
+	u8 lace_aggressiveness_profile;
+	u16 dpst;
+	u16 psr;
+	u16 drrs;
+	u16 lace_support;
+	u16 adt;
+	u16 dmrrs;
+	u16 adb;
+	u16 lace_enabled_status;
+	struct agressiveness_profile_entry aggressivenes[16];
+} __packed;
+
 /*
  * Block 52 - MIPI Configuration Block
  */