drm/i915/pps: Stash away original BIOS programmed PPS delays

In order to do the panel VBT parsing after the EDID read
(needed to determine panel_type from PNPID) we need to stash
away the original BIOS programmed PPS delays so that we
can consult them again when we reinit the PPS delays after
the VBT parsing has been done.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220510104242.6099-7-ville.syrjala@linux.intel.comReviewed-by: NJani Nikula <jani.nikula@intel.com>

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

@@ -1496,6 +1496,7 @@ struct intel_pps {
 	 */
 	bool pps_reset;
 	struct edp_power_seq pps_delays;
+	struct edp_power_seq bios_pps_delays;
 };
 
 struct intel_psr {

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

@@ -1165,16 +1165,19 @@ static bool pps_delays_valid(struct edp_power_seq *delays)
 		delays->t10 || delays->t11_t12;
 }
 
-static void pps_init_delays_cur(struct intel_dp *intel_dp,
-				struct edp_power_seq *cur)
+static void pps_init_delays_bios(struct intel_dp *intel_dp,
+				 struct edp_power_seq *bios)
 {
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 
 	lockdep_assert_held(&dev_priv->pps_mutex);
 
-	intel_pps_readout_hw_state(intel_dp, cur);
+	if (!pps_delays_valid(&intel_dp->pps.bios_pps_delays))
+		intel_pps_readout_hw_state(intel_dp, &intel_dp->pps.bios_pps_delays);
 
-	intel_pps_dump_state(intel_dp, "cur", cur);
+	*bios = intel_dp->pps.bios_pps_delays;
+
+	intel_pps_dump_state(intel_dp, "bios", bios);
 }
 
 static void pps_init_delays_vbt(struct intel_dp *intel_dp,
@@ -1242,7 +1245,7 @@ static void pps_init_delays(struct intel_dp *intel_dp)
 	if (pps_delays_valid(final))
 		return;
 
-	pps_init_delays_cur(intel_dp, &cur);
+	pps_init_delays_bios(intel_dp, &cur);
 	pps_init_delays_vbt(intel_dp, &vbt);
 	pps_init_delays_spec(intel_dp, &spec);