X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=drivers%2Fnet%2Fmacb.c;h=781a272cff2edec4650025c5c3b94515186e0f41;hb=05d134b084590684bcf4d832c0035952727b7cd9;hp=bf3983a00c67a5ce8b51292955f1a24064691dd9;hpb=47f75cf2e1d8648e3438630f3a4bddf9b5caa25d;p=oweals%2Fu-boot.git

diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index bf3983a00c..781a272cff 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -621,6 +621,24 @@ static u32 gem_mdc_clk_div(int id, struct macb_device *macb)
 	return config;
 }
 
+/*
+ * Get the DMA bus width field of the network configuration register that we
+ * should program. We find the width from decoding the design configuration
+ * register to find the maximum supported data bus width.
+ */
+static u32 macb_dbw(struct macb_device *macb)
+{
+	switch (GEM_BFEXT(DBWDEF, gem_readl(macb, DCFG1))) {
+	case 4:
+		return GEM_BF(DBW, GEM_DBW128);
+	case 2:
+		return GEM_BF(DBW, GEM_DBW64);
+	case 1:
+	default:
+		return GEM_BF(DBW, GEM_DBW32);
+	}
+}
+
 int macb_eth_initialize(int id, void *regs, unsigned int phy_addr)
 {
 	struct macb_device *macb;
@@ -665,7 +683,7 @@ int macb_eth_initialize(int id, void *regs, unsigned int phy_addr)
 	 */
 	if (macb_is_gem(macb)) {
 		ncfgr = gem_mdc_clk_div(id, macb);
-		ncfgr |= GEM_BF(DBW, 1);
+		ncfgr |= macb_dbw(macb);
 	} else {
 		ncfgr = macb_mdc_clk_div(id, macb);
 	}