drm/i915/display: Ignore IGNORE_PSR2_HW_TRACKING for platforms without sel fetch

For platforms without selective fetch this register is reserved so
do not write 0 to it.

Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201007195238.53955-1-jose.souza@intel.com

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

@@ -942,7 +942,7 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp,
 		intel_de_write(dev_priv, EXITLINE(cpu_transcoder), val);
 	}
 
-	if (HAS_PSR_HW_TRACKING(dev_priv))
+	if (HAS_PSR_HW_TRACKING(dev_priv) && HAS_PSR2_SEL_FETCH(dev_priv))
 		intel_de_rmw(dev_priv, CHICKEN_PAR1_1, IGNORE_PSR2_HW_TRACKING,
 			     dev_priv->psr.psr2_sel_fetch_enabled ?
 			     IGNORE_PSR2_HW_TRACKING : 0);