linux-kernel - [PATCH 5.10 118/154] net: stmmac: dwmac-rk: Fix ethernet on rk3399 based devices

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Message-Id: <20211124115706.097197178@linuxfoundation.org>
Date:   Wed, 24 Nov 2021 12:58:34 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Heiko Stuebner <heiko@...ech.de>,
        Punit Agrawal <punitagrawal@...il.com>,
        Michael Riesch <michael.riesch@...fvision.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 5.10 118/154] net: stmmac: dwmac-rk: Fix ethernet on rk3399 based devices

From: Punit Agrawal <punitagrawal@...il.com>

commit aec3f415f7244b7747a7952596971adb0df2f568 upstream.

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>
Tested-by: Heiko Stuebner <heiko@...ech.de>
Link: https://lore.kernel.org/r/20210929135049.3426058-1-punitagrawal@gmail.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c |    5 +++++
 1 file changed, 5 insertions(+)

--- 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"
 
@@ -1335,6 +1336,8 @@ static int rk_gmac_powerup(struct rk_pri
 		return ret;
 	}
 
+	pm_runtime_get_sync(dev);
+
 	if (bsp_priv->integrated_phy)
 		rk_gmac_integrated_phy_powerup(bsp_priv);
 
@@ -1346,6 +1349,8 @@ static void rk_gmac_powerdown(struct rk_
 	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);
 }