[PATCH] net: stmmac: Read user ID muliple times if needed.

[Hans Andersson]

From: Hans Andersson <hans.anders...@cellavision.se>

When we read user ID / Synopsys ID we might still be in reset,
so read muliple times if needed.

Signed-off-by: Hans Andersson <hans.anders...@cellavision.se>
---
 drivers/net/ethernet/stmicro/stmmac/hwif.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.c 
b/drivers/net/ethernet/stmicro/stmmac/hwif.c
index 6c61b75..3347164 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.c
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.c
@@ -10,7 +10,16 @@
 
 static u32 stmmac_get_id(struct stmmac_priv *priv, u32 id_reg)
 {
-       u32 reg = readl(priv->ioaddr + id_reg);
+       u32 reg;
+       int i;
+
+       /* We might still be in reset when we read, */
+       /* so read multiple times if needed. */
+       for (i = 0; i < 10; i++) {
+               reg = readl(priv->ioaddr + id_reg);
+               if (reg)
+                       break;
+       }
 
        if (!reg) {
                dev_info(priv->device, "Version ID not available\n");
-- 
2.17.1