netdev - [PATCH] net: stmmac: dwmac-rk: Fix ethernet on rk3399 based devices

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Date:   Wed, 29 Sep 2021 22:50:49 +0900
From:   Punit Agrawal <punitagrawal@...il.com>
To:     netdev@...r.kernel.org
Cc:     linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, davem@...emloft.net,
        peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        kuba@...nel.org, Punit Agrawal <punitagrawal@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Michael Riesch <michael.riesch@...fvision.net>
Subject: [PATCH] net: stmmac: dwmac-rk: Fix ethernet on rk3399 based devices

Commit 2d26f6e39afb ("net: stmmac: dwmac-rk: fix unbalanced pm_runtime_enable warnings")
while getting rid of a runtime PM warning ended up breaking ethernet
on rk3399 based devices. By dropping an extra reference to the device,
the commit ends up enabling suspend / resume of the ethernet device -
which appears to be broken.

While the issue with runtime pm is being investigated, partially
revert commit 2d26f6e39afb to restore the network on rk3399.

Fixes: 2d26f6e39afb ("net: stmmac: dwmac-rk: fix unbalanced pm_runtime_enable warnings")
Suggested-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Punit Agrawal <punitagrawal@...il.com>
Cc: Michael Riesch <michael.riesch@...fvision.net>
---
Hi,

There's been a few reports of broken ethernet on rk3399 based
boards. The issue got introduced due to a late commit in the 5.14
cycle.

It would be great if this commit can be taken as a fix for the next rc
as well as applied to the 5.14 stable releases.

Thanks,
Punit

 drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index ed817011a94a..6924a6aacbd5 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -21,6 +21,7 @@
 #include <linux/delay.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
+#include <linux/pm_runtime.h>
 
 #include "stmmac_platform.h"
 
@@ -1528,6 +1529,8 @@ static int rk_gmac_powerup(struct rk_priv_data *bsp_priv)
 		return ret;
 	}
 
+	pm_runtime_get_sync(dev);
+
 	if (bsp_priv->integrated_phy)
 		rk_gmac_integrated_phy_powerup(bsp_priv);
 
@@ -1539,6 +1542,8 @@ static void rk_gmac_powerdown(struct rk_priv_data *gmac)
 	if (gmac->integrated_phy)
 		rk_gmac_integrated_phy_powerdown(gmac);
 
+	pm_runtime_put_sync(&gmac->pdev->dev);
+
 	phy_power_on(gmac, false);
 	gmac_clk_enable(gmac, false);
 }
-- 
2.32.0