[PATCH net] net: airoha: Wait for NPU PPE configuration to complete in airoha_ppe_offload_setup()

[Lorenzo Bianconi]

In order to properly enable flowtable hw offloading, poll
REG_PPE_PPE_FLOW_CFG register in airoha_ppe_offload_setup routine and
wait for NPU PPE configuration triggered by ppe_init callback to complete
before running airoha_ppe_hw_init().

Fixes: 00a7678310fe3 ("net: airoha: Introduce flowtable offload support")
Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
 drivers/net/ethernet/airoha/airoha_ppe.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/airoha/airoha_ppe.c b/drivers/net/ethernet/airoha/airoha_ppe.c
index c2c32b6833df..52199f6b39f9 100644
--- a/drivers/net/ethernet/airoha/airoha_ppe.c
+++ b/drivers/net/ethernet/airoha/airoha_ppe.c
@@ -1332,6 +1332,7 @@ static int airoha_ppe_offload_setup(struct airoha_eth *eth)
 	struct airoha_npu *npu = airoha_ppe_npu_get(eth);
 	struct airoha_ppe *ppe = eth->ppe;
 	int err, ppe_num_stats_entries;
+	u32 val;
 
 	if (IS_ERR(npu))
 		return PTR_ERR(npu);
@@ -1340,6 +1341,13 @@ static int airoha_ppe_offload_setup(struct airoha_eth *eth)
 	if (err)
 		goto error_npu_put;
 
+	/* Wait for NPU PPE configuration to complete */
+	err = read_poll_timeout(airoha_fe_rr, val, val, USEC_PER_MSEC,
+				100 * USEC_PER_MSEC, false, eth,
+				REG_PPE_PPE_FLOW_CFG(0));
+	if (err)
+		goto error_npu_put;
+
 	ppe_num_stats_entries = airoha_ppe_get_total_num_stats_entries(ppe);
 	if (ppe_num_stats_entries > 0) {
 		err = npu->ops.ppe_init_stats(npu, ppe->foe_stats_dma,

---
base-commit: 02f72964395911e7a09bb2ea2fe6f79eda4ea2c2
change-id: 20260412-airoha-wait-for-npu-config-offload-setup-19d04522412d

Best regards,
-- 
Lorenzo Bianconi <lorenzo at kernel.org>