net-next: mediatek: add RX IRQ delay support
The PDMA engine used for RX allows IRQ aggregation. The patch sets up the
corresponding registers to aggregate 4 IRQs into one. Using aggregation
reduces the load on the core handling to a quarter thus reducing IRQ
latency and increasing RX performance by around 10%.
Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 24d5f1c..92be59a 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1861,9 +1861,11 @@ static int mtk_hw_init(struct mtk_eth *eth)
/* Enable RX VLan Offloading */
mtk_w32(eth, 1, MTK_CDMP_EG_CTRL);
+ /* enable interrupt delay for RX */
+ mtk_w32(eth, MTK_PDMA_DELAY_RX_DELAY, MTK_PDMA_DELAY_INT);
+
/* disable delay and normal interrupt */
mtk_w32(eth, 0, MTK_QDMA_DELAY_INT);
- mtk_w32(eth, 0, MTK_PDMA_DELAY_INT);
mtk_irq_disable(eth, MTK_QDMA_INT_MASK, ~0);
mtk_irq_disable(eth, MTK_PDMA_INT_MASK, ~0);
mtk_w32(eth, RST_GL_PSE, MTK_RST_GL);