[PATCH 6.19 046/311] net: enetc: do not access non-existent registers on pseudo MAC

Greg Kroah-Hartman
2026-04-08T18:51:44Z

From: Wei Fang <wei.fang@nxp.com>

[ Upstream commit f2df9567b123145a07ee4ea7440e233f5d0232cc ]

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@nxp.com>
Tested-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260324062121.2745033-4-wei.fang@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 6a334f2848448..993c27e342266 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,
--
2.53.0