[PATCH net-next v2 0/3] net: fec: driver code clean and bug fix

The patch serial include code clean and bug fix:
Patch#1: avoid dummy operation during suspend/resume test.
Patch#2: bug fix for i.MX6SX SOC that clean all interrupt events during MAC initial process.
Patch#3: before phy device link status is up, only enable MDIO bus interrupt.

V2:
- Modify the comment form from David's suggestion.

Fugang Duan (3):
  net: fec: reset fep link status in suspend function
  net: fec: clear all interrupt events to support i.MX6SX
  net: fec: only enable mdio interrupt before phy device link up

 drivers/net/ethernet/freescale/fec_main.c |   14 ++++++++++++--
 1 files changed, 12 insertions(+), 2 deletions(-)

-- 
1.7.8

For i.MX6SX FEC controller, there have interrupt mask and event
field extension. To support all SOCs FEC, we clear all interrupt
events during MAVC initial process.

Signed-off-by: Fugang Duan <redacted>
---
 drivers/net/ethernet/freescale/fec_main.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index b118b7d..85c955e 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c

@@ -940,7 +940,7 @@ fec_restart(struct net_device *ndev)
 	}
 
 	/* Clear any outstanding interrupt. */
-	writel(0xffc00000, fep->hwp + FEC_IEVENT);
+	writel(0xffffffff, fep->hwp + FEC_IEVENT);
 
 	fec_enet_bd_init(ndev);
 

-- 
1.7.8

Before phy device link up, we only enable FEC mdio interrupt, which
is more reasonable.

Signed-off-by: Fugang Duan <redacted>
---
 drivers/net/ethernet/freescale/fec_main.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 85c955e..8c5b15e 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c

@@ -1075,7 +1075,10 @@ fec_restart(struct net_device *ndev)
 		fec_ptp_start_cyclecounter(ndev);
 
 	/* Enable interrupts we wish to service */
-	writel(FEC_DEFAULT_IMASK, fep->hwp + FEC_IMASK);
+	if (fep->link)
+		writel(FEC_DEFAULT_IMASK, fep->hwp + FEC_IMASK);
+	else
+		writel(FEC_ENET_MII, fep->hwp + FEC_IMASK);
 
 	/* Init the interrupt coalescing */
 	fec_enet_itr_coal_init(ndev);

-- 
1.7.8

On some i.MX6 serial boards, phy power and refrence clock are supplied
or controlled by SOC. When do suspend/resume test, the power and clock
are disabled, so phy device link down.

For current driver, fep->link is still up status, which cause extra operation
like below code. To avoid the dumy operation, we set fep->link to down when
phy device is real down.
...
if (fep->link) {
	napi_disable(&fep->napi);
	netif_tx_lock_bh(ndev);
	fec_stop(ndev);
	netif_tx_unlock_bh(ndev);
	napi_enable(&fep->napi);
	fep->link = phy_dev->link;
	status_change = 1;
}
...

Signed-off-by: Fugang Duan <redacted>
---
 drivers/net/ethernet/freescale/fec_main.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index fee2afe..b118b7d 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c

@@ -3332,6 +3332,12 @@ static int __maybe_unused fec_suspend(struct device *dev)
 	if (fep->reg_phy)
 		regulator_disable(fep->reg_phy);
 
+	/* SOC supply clock to phy, when clock is disabled, phy link down
+	 * SOC control phy regulator, when regulator is disabled, phy link down
+	 */
+	if (fep->clk_enet_out || fep->reg_phy)
+		fep->link = 0;
+
 	return 0;
 }
 

-- 
1.7.8

From: Fugang Duan <redacted>
Date: Thu, 11 Dec 2014 09:20:30 +0800

The patch serial include code clean and bug fix:
Patch#1: avoid dummy operation during suspend/resume test.
Patch#2: bug fix for i.MX6SX SOC that clean all interrupt events during MAC initial process.
Patch#3: before phy device link status is up, only enable MDIO bus interrupt.

V2:
- Modify the comment form from David's suggestion.

Series applied, thanks.