netdev - [PATCH] net: stmmac: dwmac4: Re-enable MAC Rx before powering down

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Message-Id: <1506422693-26144-1-git-send-email-ed.blake@sondrel.com>
Date:   Tue, 26 Sep 2017 11:44:53 +0100
From:   Ed Blake <ed.blake@...drel.com>
To:     peppe.cavallaro@...com, alexandre.torgue@...com
Cc:     netdev@...r.kernel.org, Ed Blake <ed.blake@...drel.com>
Subject: [PATCH] net: stmmac: dwmac4: Re-enable MAC Rx before powering down

Re-enable the MAC receiver by setting CONFIG_RE before powering down,
as instructed in section 6.3.5.1 of [1].  Without this the MAC fails
to receive WoL packets and never wakes up.

[1] DWC Ethernet QoS Databook 4.10a October 2014

Signed-off-by: Ed Blake <ed.blake@...drel.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index c4407e8..2f7d7ec 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -296,6 +296,7 @@ static void dwmac4_pmt(struct mac_device_info *hw, unsigned long mode)
 {
 	void __iomem *ioaddr = hw->pcsr;
 	unsigned int pmt = 0;
+	u32 config;
 
 	if (mode & WAKE_MAGIC) {
 		pr_debug("GMAC: WOL Magic frame\n");
@@ -306,6 +307,12 @@ static void dwmac4_pmt(struct mac_device_info *hw, unsigned long mode)
 		pmt |= power_down | global_unicast | wake_up_frame_en;
 	}
 
+	if (pmt) {
+		/* The receiver must be enabled for WOL before powering down */
+		config = readl(ioaddr + GMAC_CONFIG);
+		config |= GMAC_CONFIG_RE;
+		writel(config, ioaddr + GMAC_CONFIG);
+	}
 	writel(pmt, ioaddr + GMAC_PMT);
 }
 
-- 
1.9.1