[PATCH v5 net 3/3] net: enetc: do not access non-existent registers on pseudo MAC

[Wei Fang]

The ENETC4_PM_IEVENT and ENETC4_PM_CMD_CFG registers do not exist on the
ENETC pseudo MAC, so the driver should prevent from accessing them.

Fixes: 5175c1e4adca ("net: enetc: add basic support for the ENETC with pseudo MAC for i.MX94")
Signed-off-by: Wei Fang <wei.fang@xxxxxxx>
---
Note that the commit 5175c1e4adca ("net: enetc: add basic support for
the ENETC with pseudo MAC for i.MX94") does not have such issue, this
patch depends on the patch 2 in this patch set.
---
 drivers/net/ethernet/freescale/enetc/enetc4_pf.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc4_pf.c b/drivers/net/ethernet/freescale/enetc/enetc4_pf.c
index 53cecbb23a97..56899f2254aa 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc4_pf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc4_pf.c
@@ -814,6 +814,9 @@ static void enetc4_mac_tx_graceful_stop(struct enetc_pf *pf)
 	val |= POR_TXDIS;
 	enetc_port_wr(hw, ENETC4_POR, val);
 
+	if (enetc_is_pseudo_mac(si))
+		return;
+
 	enetc4_mac_wait_tx_empty(si, 0);
 	if (si->hw_features & ENETC_SI_F_QBU)
 		enetc4_mac_wait_tx_empty(si, 1);
@@ -856,6 +859,9 @@ static void enetc4_mac_rx_graceful_stop(struct enetc_pf *pf)
 	struct enetc_si *si = pf->si;
 	u32 val;
 
+	if (enetc_is_pseudo_mac(si))
+		goto check_rx_busy;
+
 	if (si->hw_features & ENETC_SI_F_QBU) {
 		val = enetc_port_rd(hw, ENETC4_PM_CMD_CFG(1));
 		val &= ~PM_CMD_CFG_RX_EN;
@@ -868,6 +874,7 @@ static void enetc4_mac_rx_graceful_stop(struct enetc_pf *pf)
 	enetc_port_wr(hw, ENETC4_PM_CMD_CFG(0), val);
 	enetc4_mac_wait_rx_empty(si, 0);
 
+check_rx_busy:
 	if (read_poll_timeout(enetc_port_rd, val,
 			      !(val & PSR_RX_BUSY),
 			      100, 10000, false, hw,
-- 
2.34.1