stmmac: get the descriptor structure from platform

Output for chip that uses the Enhanced descriptors:
[snip]
STMMAC driver:
	platform registration... done!
	DWMAC1000 - user ID: 0x10, Synopsys ID: 0x33
	Enhanced descriptor structure
	no valid MAC address;please, use ifconfig or nwhwconfig!
	eth0 - (dev. name: stmmaceth - id: 0, IRQ #134
	IO base addr: 0xfd110000)
STMMAC MII Bus: probed
[snip]

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 9 insertions, 4 deletions

diff --git a/drivers/net/stmmac/stmmac.h b/drivers/net/stmmac/stmmac.h
index 55b9acae82a1..0d776bc23143 100644
--- a/drivers/net/stmmac/stmmac.h
+++ b/drivers/net/stmmac/stmmac.h
@@ -93,6 +93,7 @@ struct stmmac_priv {
 #ifdef STMMAC_VLAN_TAG_USED
         struct vlan_group *vlgrp;
 #endif
+        int enh_desc;
 };
 
 #ifdef CONFIG_STM_DRIVERS
diff --git a/drivers/net/stmmac/stmmac_main.c b/drivers/net/stmmac/stmmac_main.c
index dfeea96f681a..7ac6ddea989e 100644
--- a/drivers/net/stmmac/stmmac_main.c
+++ b/drivers/net/stmmac/stmmac_main.c
@@ -1581,13 +1581,16 @@ static int stmmac_mac_device_setup(struct net_device *dev)
 
         struct mac_device_info *device;
 
-        if (priv->is_gmac) {
+        if (priv->is_gmac)
                 device = dwmac1000_setup(ioaddr);
-                device->desc = &enh_desc_ops;
-        } else {
+        else
                 device = dwmac100_setup(ioaddr);
+
+        if (priv->enh_desc) {
+                device->desc = &enh_desc_ops;
+                pr_info("\tEnhanced descriptor structure\n");
+        } else
                 device->desc = &ndesc_ops;
-        }
 
         if (!device)
                 return -ENOMEM;
@@ -1729,6 +1732,7 @@ static int stmmac_dvr_probe(struct platform_device *pdev)
         priv->bus_id = plat_dat->bus_id;
         priv->pbl = plat_dat->pbl;      /* TLI */
         priv->is_gmac = plat_dat->has_gmac;     /* GMAC is on board */
+        priv->enh_desc = plat_dat->enh_desc;
 
         platform_set_drvdata(pdev, ndev);