forcedeth: phy status fix

The driver needs to ack only the phy status bits that it is currently
handling and preserve the other bits for the other handlers. For
example, when reading/writing from the phy, it should not clear the link
change interrupt bit. This will cause a missing link change interrupt.

Signed-off-by: Ayaz Abdulla <aabdulla@nvidia.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index 6e47b11..6d5cd94 100644 (file)
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -323,8 +323,8 @@ enum {
        NvRegMIIStatus = 0x180,
 #define NVREG_MIISTAT_ERROR            0x0001
 #define NVREG_MIISTAT_LINKCHANGE       0x0008
-#define NVREG_MIISTAT_MASK             0x000f
-#define NVREG_MIISTAT_MASK2            0x000f
+#define NVREG_MIISTAT_MASK_RW          0x0007
+#define NVREG_MIISTAT_MASK_ALL         0x000f
        NvRegMIIMask = 0x184,
 #define NVREG_MII_LINKCHANGE           0x0008
 
@@ -1064,7 +1064,7 @@ static int mii_rw(struct net_device *dev, int addr, int miireg, int value)
        u32 reg;
        int retval;
 
-       writel(NVREG_MIISTAT_MASK, base + NvRegMIIStatus);
+       writel(NVREG_MIISTAT_MASK_RW, base + NvRegMIIStatus);
 
        reg = readl(base + NvRegMIIControl);
        if (reg & NVREG_MIICTL_INUSE) {
@@ -2995,7 +2995,7 @@ static void nv_link_irq(struct net_device *dev)
        u32 miistat;
 
        miistat = readl(base + NvRegMIIStatus);
-       writel(NVREG_MIISTAT_MASK, base + NvRegMIIStatus);
+       writel(NVREG_MIISTAT_LINKCHANGE, base + NvRegMIIStatus);
        dprintk(KERN_INFO "%s: link change irq, status 0x%x.\n", dev->name, miistat);
 
        if (miistat & (NVREG_MIISTAT_LINKCHANGE))
@@ -4870,7 +4870,7 @@ static int nv_open(struct net_device *dev)
 
        writel(0, base + NvRegMIIMask);
        writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus);
-       writel(NVREG_MIISTAT_MASK2, base + NvRegMIIStatus);
+       writel(NVREG_MIISTAT_MASK_ALL, base + NvRegMIIStatus);
 
        writel(NVREG_MISC1_FORCE | NVREG_MISC1_HD, base + NvRegMisc1);
        writel(readl(base + NvRegTransmitterStatus), base + NvRegTransmitterStatus);
@@ -4908,7 +4908,7 @@ static int nv_open(struct net_device *dev)
 
        nv_disable_hw_interrupts(dev, np->irqmask);
        pci_push(base);
-       writel(NVREG_MIISTAT_MASK2, base + NvRegMIIStatus);
+       writel(NVREG_MIISTAT_MASK_ALL, base + NvRegMIIStatus);
        writel(NVREG_IRQSTAT_MASK, base + NvRegIrqStatus);
        pci_push(base);
 
@@ -4931,7 +4931,7 @@ static int nv_open(struct net_device *dev)
        {
                u32 miistat;
                miistat = readl(base + NvRegMIIStatus);
-               writel(NVREG_MIISTAT_MASK, base + NvRegMIIStatus);
+               writel(NVREG_MIISTAT_MASK_ALL, base + NvRegMIIStatus);
                dprintk(KERN_INFO "startup: got 0x%08x.\n", miistat);
        }
        /* set linkspeed to invalid value, thus force nv_update_linkspeed
@@ -5299,7 +5299,7 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i
                phystate &= ~NVREG_ADAPTCTL_RUNNING;
                writel(phystate, base + NvRegAdapterControl);
        }
-       writel(NVREG_MIISTAT_MASK, base + NvRegMIIStatus);
+       writel(NVREG_MIISTAT_MASK_ALL, base + NvRegMIIStatus);
 
        if (id->driver_data & DEV_HAS_MGMT_UNIT) {
                /* management unit running on the mac? */