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Message-Id: <1321958137-23281-1-git-send-email-jlee@suse.com>
Date: Tue, 22 Nov 2011 18:35:37 +0800
From: "Lee, Chun-Yi" <joeyli.kernel@...il.com>
To: nic_swsd@...ltek.com
Cc: netdev@...r.kernel.org, "Lee, Chun-Yi" <jlee@...e.com>,
Hayes Wang <hayeswang@...ltek.com>,
Francois Romieu <romieu@...zoreil.com>
Subject: [PATCH] r8169: Restore MAC address after resume on buggy BIOS
When we test r8169 driver with RTL8111E-VL, found have buggy BIOS
write garbage MAC address (e.g. FF:FF:FF:FF:FF:FF) to extended GigaMAC
registers when S3 resume. And, we also found Realtek Windows driver
can cover this buggy BIOS's problem.
So, this patch add a MAC address check in resume callback function and
restore MAC address if buggy BIOS changed it.
Signed-off-by: Lee, Chun-Yi <jlee@...e.com>
Cc: Hayes Wang <hayeswang@...ltek.com>
Cc: Realtek linux nic maintainers <nic_swsd@...ltek.com>
Cc: Francois Romieu <romieu@...zoreil.com>
---
drivers/net/ethernet/realtek/r8169.c | 33 +++++++++++++++++++++++++++++++++
1 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 6f06aa1..91d4a09 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -3335,6 +3335,35 @@ static void rtl_rar_set(struct rtl8169_private *tp, u8 *addr)
spin_unlock_irq(&tp->lock);
}
+static bool rtl_rar_check(struct rtl8169_private *tp, u8 *addr)
+{
+ void __iomem *ioaddr = tp->mmio_addr;
+ u32 high;
+ u32 low;
+
+ low = addr[0] | (addr[1] << 8) | (addr[2] << 16) | (addr[3] << 24);
+ high = addr[4] | (addr[5] << 8);
+
+ if (RTL_R32(MAC4) != high)
+ return false;
+ if (RTL_R32(MAC0) != low)
+ return false;
+
+ if (tp->mac_version == RTL_GIGA_MAC_VER_34) {
+ if (rtl_eri_read(ioaddr, 0xe0, ERIAR_EXGMAC) != low)
+ return false;
+ if (rtl_eri_read(ioaddr, 0xe4, ERIAR_EXGMAC) != high)
+ return false;
+ if (rtl_eri_read(ioaddr, 0xf0, ERIAR_EXGMAC) != (low << 16))
+ return false;
+ if (rtl_eri_read(ioaddr, 0xf4, ERIAR_EXGMAC) != (high << 16 |
+ low >> 16))
+ return false;
+ }
+
+ return true;
+}
+
static int rtl_set_mac_address(struct net_device *dev, void *p)
{
struct rtl8169_private *tp = netdev_priv(dev);
@@ -6098,6 +6127,10 @@ static int rtl8169_resume(struct device *device)
rtl8169_init_phy(dev, tp);
+ /* Restore MAC address if buggy BIOS changed it */
+ if (!rtl_rar_check(tp, dev->dev_addr))
+ rtl_rar_set(tp, dev->dev_addr);
+
if (netif_running(dev))
__rtl8169_resume(dev);
--
1.6.0.2
--
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