From: Tero Kristo <t-kristo@ti.com>
Date: Wed, 9 Oct 2019 15:55:37 +0000 (-0700)
Subject: soc: ti: omap-prm: poll for reset complete during de-assert
X-Git-Tag: v5.5-rc1~40^2~14^2~8
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=c5117a78dd88e5b673897baec0a6eed9ee599e02;p=linux.git

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 <t-kristo@ti.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
---

diff --git a/drivers/soc/ti/omap_prm.c b/drivers/soc/ti/omap_prm.c
index d171e96e4ef1..a3ffb19e402f 100644
--- a/drivers/soc/ti/omap_prm.c
+++ b/drivers/soc/ti/omap_prm.c
@@ -152,6 +152,18 @@ static int omap_reset_deassert(struct reset_controller_dev *rcdev,
 	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;
 }