linux-kernel - [PATCH 12/13] net: ravb: Assert/deassert reset on suspend/resume

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Message-Id: <20231120084606.4083194-13-claudiu.beznea.uj@bp.renesas.com>
Date:   Mon, 20 Nov 2023 10:46:05 +0200
From:   Claudiu <claudiu.beznea@...on.dev>
To:     s.shtylyov@....ru, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, p.zabel@...gutronix.de,
        yoshihiro.shimoda.uh@...esas.com, geert+renesas@...der.be,
        wsa+renesas@...g-engineering.com, biju.das.jz@...renesas.com,
        prabhakar.mahadev-lad.rj@...renesas.com,
        sergei.shtylyov@...entembedded.com,
        mitsuhiro.kimura.kc@...esas.com, masaru.nagai.vx@...esas.com
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 12/13] net: ravb: Assert/deassert 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 resumming from such state the Ethernet controller needs to be
reinitialized. Deasserting the reset signal for it should also be done.
Thus add reset assert/deassert on suspend/resume functions.

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

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---
 drivers/net/ethernet/renesas/ravb_main.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index a93b3d6b1863..f4634ac0c972 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2972,7 +2972,10 @@ static int ravb_suspend(struct device *dev)
 	if (priv->info->ccc_gac)
 		ravb_ptp_stop(ndev);
 
-	return ret;
+	if (priv->wol_enabled)
+		return ret;
+
+	return reset_control_assert(priv->rstc);
 }
 
 static int ravb_resume(struct device *dev)
@@ -2980,7 +2983,11 @@ 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