2 files changed, 38 insertions, 3 deletions

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index c2fabc1853ad..fccb7a371cc8 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -947,6 +947,11 @@ static void gfar_detect_errata(struct gfar_private *priv)
                         (pvr == 0x80861010 && (mod & 0xfff9) == 0x80c0))
                 priv->errata |= GFAR_ERRATA_76;
 
+        /* MPC8313 and MPC837x all rev */
+        if ((pvr == 0x80850010 && mod == 0x80b0) ||
+                        (pvr == 0x80861010 && (mod & 0xfff9) == 0x80c0))
+                priv->errata |= GFAR_ERRATA_A002;
+
         if (priv->errata)
                 dev_info(dev, "enabled errata workarounds, flags: 0x%x\n",
                          priv->errata);
@@ -1570,6 +1575,29 @@ static void init_registers(struct net_device *dev)
         gfar_write(&regs->minflr, MINFLR_INIT_SETTINGS);
 }
 
+static int __gfar_is_rx_idle(struct gfar_private *priv)
+{
+        u32 res;
+
+        /*
+         * Normaly TSEC should not hang on GRS commands, so we should
+         * actually wait for IEVENT_GRSC flag.
+         */
+        if (likely(!gfar_has_errata(priv, GFAR_ERRATA_A002)))
+                return 0;
+
+        /*
+         * Read the eTSEC register at offset 0xD1C. If bits 7-14 are
+         * the same as bits 23-30, the eTSEC Rx is assumed to be idle
+         * and the Rx can be safely reset.
+         */
+        res = gfar_read((void __iomem *)priv->gfargrp[0].regs + 0xd1c);
+        res &= 0x7f807f80;
+        if ((res & 0xffff) == (res >> 16))
+                return 1;
+
+        return 0;
+}
 
 /* Halt the receive and transmit queues */
 static void gfar_halt_nodisable(struct net_device *dev)
@@ -1593,12 +1621,18 @@ static void gfar_halt_nodisable(struct net_device *dev)
         tempval = gfar_read(&regs->dmactrl);
         if ((tempval & (DMACTRL_GRS | DMACTRL_GTS))
             != (DMACTRL_GRS | DMACTRL_GTS)) {
+                int ret;
+
                 tempval |= (DMACTRL_GRS | DMACTRL_GTS);
                 gfar_write(&regs->dmactrl, tempval);
 
-                spin_event_timeout(((gfar_read(&regs->ievent) &
-                         (IEVENT_GRSC | IEVENT_GTSC)) ==
-                         (IEVENT_GRSC | IEVENT_GTSC)), -1, 0);
+                do {
+                        ret = spin_event_timeout(((gfar_read(&regs->ievent) &
+                                 (IEVENT_GRSC | IEVENT_GTSC)) ==
+                                 (IEVENT_GRSC | IEVENT_GTSC)), 1000000, 0);
+                        if (!ret && !(gfar_read(&regs->ievent) & IEVENT_GRSC))
+                                ret = __gfar_is_rx_idle(priv);
+                } while (!ret);
         }
 }
 
diff --git a/drivers/net/gianfar.h b/drivers/net/gianfar.h
index c414374f407f..710810e2adb4 100644
--- a/drivers/net/gianfar.h
+++ b/drivers/net/gianfar.h
@@ -1028,6 +1028,7 @@ struct gfar_priv_grp {
 enum gfar_errata {
         GFAR_ERRATA_74          = 0x01,
         GFAR_ERRATA_76          = 0x02,
+        GFAR_ERRATA_A002        = 0x04,
 };
 
 /* Struct stolen almost completely (and shamelessly) from the FCC enet source