netdev - [PATCH 4.6 fix] bgmac: reset & enable Ethernet core before using it

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Message-Id: <1460460645-10016-1-git-send-email-zajec5@gmail.com>
Date:	Tue, 12 Apr 2016 13:30:45 +0200
From:	Rafał Miłecki <zajec5@...il.com>
To:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:	Hauke Mehrtens <hauke@...ke-m.de>,
	Rafał Miłecki <zajec5@...il.com>,
	Felix Fietkau <nbd@...nwrt.org>
Subject: [PATCH 4.6 fix] bgmac: reset & enable Ethernet core before using it

This fixes Ethernet on D-Link DIR-885L with BCM47094 SoC. Felix reported
similar fix was needed for his BCM4709 device (Buffalo WXR-1900DHP?).
I tested this for regressions on BCM4706, BCM4708A0 and BCM47081A0.

Cc: Felix Fietkau <nbd@...nwrt.org>
Signed-off-by: Rafał Miłecki <zajec5@...il.com>
---
 drivers/net/ethernet/broadcom/bgmac.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index 99b30a9..38db2e4 100644
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -1572,6 +1572,11 @@ static int bgmac_probe(struct bcma_device *core)
 		dev_warn(&core->dev, "Using random MAC: %pM\n", mac);
 	}
 
+	/* This (reset &) enable is not preset in specs or reference driver but
+	 * Broadcom does it in arch PCI code when enabling fake PCI device.
+	 */
+	bcma_core_enable(core, 0);
+
 	/* Allocation and references */
 	net_dev = alloc_etherdev(sizeof(*bgmac));
 	if (!net_dev)
-- 
1.8.4.5