drm/i915: PSR link standby at debugfs

It is useful to know at debug time if we are keeping main link on.
Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: NDurgadoss R <durgadoss.r@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -2248,6 +2248,9 @@ static int i915_edp_psr_status(struct seq_file *m, void *data)
 		}
 	seq_puts(m, "\n");
 
+	seq_printf(m, "Link standby: %s\n",
+		   yesno((bool)dev_priv->psr.link_standby));
+
 	/* CHV PSR has no kind of performance counter */
 	if (HAS_PSR(dev) && HAS_DDI(dev)) {
 		psrperf = I915_READ(EDP_PSR_PERF_CNT(dev)) &