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Subject[PATCH] net: stmmac: Read user ID muliple times if needed.
Date
From: Hans Andersson <hans.andersson@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.andersson@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
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