[PATCH net] net: airoha: Add missing RX_CPU_IDX() configuration in airoha_qdma_cleanup_rx_queue()

[Lorenzo Bianconi]

When the descriptor index written in REG_RX_CPU_IDX() is equal to the one
stored in REG_RX_DMA_IDX(), the hw will stop since the QDMA RX ring is
empty.
Add missing REG_RX_CPU_IDX() configuration in airoha_qdma_cleanup_rx_queue
routine during QDMA RX ring cleanup.

Fixes: 514aac359987 ("net: airoha: Add missing cleanup bits in airoha_qdma_cleanup_rx_queue()")
Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
 drivers/net/ethernet/airoha/airoha_eth.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
index 91cb63a32d99..919b7009cbe5 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.c
+++ b/drivers/net/ethernet/airoha/airoha_eth.c
@@ -819,6 +819,11 @@ static void airoha_qdma_cleanup_rx_queue(struct airoha_queue *q)
 	}
 
 	q->head = q->tail;
+	/* Set RX_DMA_IDX to RX_CPU_IDX to notify the hw the QDMA RX ring is
+	 * empty.
+	 */
+	airoha_qdma_rmw(qdma, REG_RX_CPU_IDX(qid), RX_RING_CPU_IDX_MASK,
+			FIELD_PREP(RX_RING_CPU_IDX_MASK, q->head));
 	airoha_qdma_rmw(qdma, REG_RX_DMA_IDX(qid), RX_RING_DMA_IDX_MASK,
 			FIELD_PREP(RX_RING_DMA_IDX_MASK, q->tail));
 }

---
base-commit: f821664dde29302e8450aa0597bf1e4c7c5b0a22
change-id: 20260331-airoha-cpu-idx-airoha_qdma_cleanup_rx_queue-efde9e4ab786

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