soc: ti: omap-prm: poll for reset complete during de-assert

Poll for reset completion status during de-assertion of reset, otherwise
the IP in question might be accessed before it has left reset properly.

Signed-off-by: Tero Kristo <[e-mail]>
Reviewed-by: Philipp Zabel <[e-mail]>
Reviewed-by: Tony Lindgren <[e-mail]>
Signed-off-by: Santosh Shilimkar <[e-mail]>

drivers/soc/ti/omap_prm.c

···
 	writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl);
 	spin_unlock_irqrestore(&reset->lock, flags);
 
+	if (!has_rstst)
+		return 0;
+
+	/* wait for the status to be set */
+	ret = readl_relaxed_poll_timeout(reset->prm->base +
+					 reset->prm->data->rstst,
+					 v, v & BIT(st_bit), 1,
+					 OMAP_RESET_MAX_WAIT);
+	if (ret)
+		pr_err("%s: timedout waiting for %s:%lu\n", __func__,
+		       reset->prm->data->name, id);
+
 	return 0;
 }