linux-kernel - [PATCH net-next v2 06/21] net: ravb: Assert/de-assert reset on suspend/resume

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Message-Id: <20231214114600.2451162-7-claudiu.beznea.uj@bp.renesas.com>
Date:   Thu, 14 Dec 2023 13:45:45 +0200
From:   Claudiu <claudiu.beznea@...on.dev>
To:     s.shtylyov@....ru, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, richardcochran@...il.com,
        p.zabel@...gutronix.de, yoshihiro.shimoda.uh@...esas.com,
        wsa+renesas@...g-engineering.com, geert+renesas@...der.be
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH net-next v2 06/21] net: ravb: Assert/de-assert reset on suspend/resume

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

RZ/G3S can go to deep sleep states where power to most of the SoC parts is
off. When resuming from such a state, the Ethernet controller needs to be
reinitialized. De-asserting the reset signal for it should also be done.
Thus, add reset assert/de-assert on suspend/resume functions.

On the resume function, the de-assert was not reverted in case of failures
to give the user a chance to restore the interface (e.g., bringing down/up
the interface) in case suspend/resume failed.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---

Changes in v2:
- fixed typos in patch description and subject
- on ravb_suspend() assert the reset signal in case interface is down;
  due to this the Sergey's Rb tag was left aside in this version

 drivers/net/ethernet/renesas/ravb_main.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 5a57383762e7..9a618d8dbfcd 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2985,7 +2985,7 @@ static int ravb_suspend(struct device *dev)
 	int ret;
 
 	if (!netif_running(ndev))
-		return 0;
+		goto reset_assert;
 
 	netif_device_detach(ndev);
 
@@ -2997,7 +2997,11 @@ static int ravb_suspend(struct device *dev)
 	if (priv->info->ccc_gac)
 		ravb_ptp_stop(ndev);
 
-	return ret;
+	if (priv->wol_enabled)
+		return ret;
+
+reset_assert:
+	return reset_control_assert(priv->rstc);
 }
 
 static int ravb_resume(struct device *dev)
@@ -3005,7 +3009,11 @@ static int ravb_resume(struct device *dev)
 	struct net_device *ndev = dev_get_drvdata(dev);
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
-	int ret = 0;
+	int ret;
+
+	ret = reset_control_deassert(priv->rstc);
+	if (ret)
+		return ret;
 
 	/* If WoL is enabled set reset mode to rearm the WoL logic */
 	if (priv->wol_enabled) {
-- 
2.39.2