net: ethernet: mtk_eth_soc: Fix DIM support for MT7628/88

When updating to latest mainline for some testing on the GARDENA smart
gateway based on the MT7628, I noticed that ethernet does not work any
more. Commit e9229ffd ("net: ethernet: mtk_eth_soc: implement
dynamic interrupt moderation") introduced this problem, as it missed the
RX_DIM & TX_DIM configuration for this SoC variant. This patch fixes
this by calling mtk_dim_rx() & mtk_dim_tx() in this case as well.
Signed-off-by: Stefan Roese <sr@denx.de>
Fixes: e9229ffd ("net: ethernet: mtk_eth_soc: implement dynamic interrupt moderation")
Cc: Felix Fietkau <nbd@nbd.name>
Cc: John Crispin <john@phrozen.org>
Cc: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Cc: Reto Schneider <code@reto-schneider.ch>
Cc: Reto Schneider <reto.schneider@husqvarnagroup.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mediatek/mtk_eth_soc.c

@@ -2423,7 +2423,8 @@ static void mtk_dim_rx(struct work_struct *work)
 	val |= cur << MTK_PDMA_DELAY_RX_PINT_SHIFT;
 
 	mtk_w32(eth, val, MTK_PDMA_DELAY_INT);
-	mtk_w32(eth, val, MTK_QDMA_DELAY_INT);
+	if (MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA))
+		mtk_w32(eth, val, MTK_QDMA_DELAY_INT);
 
 	spin_unlock_bh(&eth->dim_lock);
 
@@ -2452,7 +2453,8 @@ static void mtk_dim_tx(struct work_struct *work)
 	val |= cur << MTK_PDMA_DELAY_TX_PINT_SHIFT;
 
 	mtk_w32(eth, val, MTK_PDMA_DELAY_INT);
-	mtk_w32(eth, val, MTK_QDMA_DELAY_INT);
+	if (MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA))
+		mtk_w32(eth, val, MTK_QDMA_DELAY_INT);
 
 	spin_unlock_bh(&eth->dim_lock);
 
@@ -2480,6 +2482,10 @@ static int mtk_hw_init(struct mtk_eth *eth)
 			goto err_disable_pm;
 		}
 
+		/* set interrupt delays based on current Net DIM sample */
+		mtk_dim_rx(&eth->rx_dim.work);
+		mtk_dim_tx(&eth->tx_dim.work);
+
 		/* disable delay and normal interrupt */
 		mtk_tx_irq_disable(eth, ~0);
 		mtk_rx_irq_disable(eth, ~0);