[PATCH RFC net-next 06/10] net: stmmac: dche is only for GMAC4 cores

["Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>]

dma_cfg->dche is only read by dwmac4_dma_init(), which is only called
for the DWMAC_CORE_GMAC4 core type. Rather than having a bare IP
version check that can match any core type, make this conditional on
DWMAC_CORE_GMAC4 to make it clear that it's a GMAC4 feature.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 295d31d7b28b..e47321119c83 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -7895,9 +7895,10 @@ static int __stmmac_dvr_probe(struct device *device,
 	if (ret)
 		goto error_hw_init;
 
-	/* Only DWMAC core version 5.20 onwards supports HW descriptor prefetch.
+	/* Only DWMAC4 core version 5.20 onwards support HW descriptor prefetch.
 	 */
-	if (priv->snpsver < DWMAC_CORE_5_20)
+	if (priv->plat->core_type != DWMAC_CORE_GMAC4 ||
+	    priv->snpsver < DWMAC_CORE_5_20)
 		priv->plat->dma_cfg->dche = false;
 
 	stmmac_check_ether_addr(priv);
-- 
2.47.3