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[PATCHv8,3/9] soc: ti: omap-prm: poll for reset complete during de-assert

Message ID 20191008125544.20679-4-t-kristo@ti.com
State New
Headers show
Series soc: ti: add OMAP PRM driver (for reset) | expand

Commit Message

Tero Kristo Oct. 8, 2019, 12:55 p.m. UTC 
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>

---
 drivers/soc/ti/omap_prm.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

-- 
2.17.1

--
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
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Patch

diff --git a/drivers/soc/ti/omap_prm.c b/drivers/soc/ti/omap_prm.c
index ab0b66ad715d..96fa2aad9b93 100644
--- a/drivers/soc/ti/omap_prm.c
+++ b/drivers/soc/ti/omap_prm.c
@@ -153,6 +153,18 @@  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;
 }