[PATCH 2/2] net: fec_mxc: Skip recv packet process when fec is halted

[Peng Fan (OSS)]

From: Ye Li <ye.li at nxp.com>

After FEC is halted by calling fec_halt callback, we should not continue
receiving packet. Otherwise it will process previous pending interrupts
on EIR register and uses wrong rbd index as this has been reset to 0.

The GRA interrupt which is triggered by issuing graceful stop command to
FEC transmitter in fec_halt is processed in this case. It causes wrong
receive buffer descriptors be used by FEC in next time.

Signed-off-by: Ye Li <ye.li at nxp.com>
Reviewed-by: Peng Fan <peng.fan at nxp.com>
Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 drivers/net/fec_mxc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index e5d7f0f3e1e..14fea891f7d 100644
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -818,6 +818,9 @@ static int fecmxc_recv(struct udevice *dev, int flags, uchar **packetp)
 		return -ENOMEM;
 	}
 
+	if (!(readl(&fec->eth->ecntrl) & FEC_ECNTRL_ETHER_EN))
+		return 0;
+
 	/* Check if any critical events have happened */
 	ievent = readl(&fec->eth->ievent);
 	writel(ievent, &fec->eth->ievent);
-- 
2.35.3