[U-Boot] [PATCH v2] net: macb: Not all the GEM are gigabit capable

[Gregory CLEMENT]

During the initialization of PHY the gigabit bit capable is set if the
controller is a GEM. However, for sama5d2 and sama5d4, the GEM is
configured to support only 10/100.

Improperly setting the GBE capability leads to an unresponsive MAC
controller. This patch fix this behavior allowing to use the gmac with
these SoCs.

Suggested-by: Nicolas Ferre <nicolas.ferre at atmel.com>
Signed-off-by: Gregory CLEMENT <gregory.clement at free-electrons.com>

fix gem
---
 drivers/net/macb.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index a5c1880..ab38f48 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -109,6 +109,15 @@ static int macb_is_gem(struct macb_device *macb)
 	return MACB_BFEXT(IDNUM, macb_readl(macb, MID)) == 0x2;
 }
 
+static int gem_is_gigabit_capable(struct macb_device *macb)
+{
+	/*
+	 * The GEM controllers embeded in SAMA5D2 and SAMA5D4 are
+	 * configured to support only 10/100.
+	 */
+	return macb_is_gem(macb) && !cpu_is_sama5d2() && !cpu_is_sama5d2();
+}
+
 static void macb_mdio_write(struct macb_device *macb, u8 reg, u16 value)
 {
 	unsigned long netctl;
@@ -480,8 +489,8 @@ static int macb_phy_init(struct macb_device *macb)
 		return 0;
 	}
 
-	/* First check for GMAC */
-	if (macb_is_gem(macb)) {
+	/* First check for GMAC and that it is GiB capable */
+	if (gem_is_gigabit_capable(macb))
 		lpa = macb_mdio_read(macb, MII_STAT1000);
 
 		if (lpa & (LPA_1000FULL | LPA_1000HALF)) {
-- 
2.5.0