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 <j...@phrozen.org>
---
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 4 +++-
drivers/net/ethernet/mediatek/mtk_eth_soc.h | 13 ++++++++++---
2 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 24d5f1cad7f4..92be59a1e4e7 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);
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 3c46a3b613b9..e130c3b24c4c 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -125,7 +125,14 @@
#define MTK_PST_DRX_IDX_CFG(x) (MTK_PST_DRX_IDX0 << (x))
/* PDMA Delay Interrupt Register */
-#define MTK_PDMA_DELAY_INT 0xa0c
+#define MTK_PDMA_DELAY_INT 0xa0c
+#define MTK_PDMA_DELAY_RX_EN BIT(15)
+#define MTK_PDMA_DELAY_RX_PINT 4
+#define MTK_PDMA_DELAY_RX_PINT_SHIFT 8
+#define MTK_PDMA_DELAY_RX_PTIME 4
+#define MTK_PDMA_DELAY_RX_DELAY \
+ (MTK_PDMA_DELAY_RX_EN | MTK_PDMA_DELAY_RX_PTIME | \
+ (MTK_PDMA_DELAY_RX_PINT << MTK_PDMA_DELAY_RX_PINT_SHIFT))
/* PDMA Interrupt Status Register */
#define MTK_PDMA_INT_STATUS 0xa20
@@ -206,6 +213,7 @@
/* QDMA Interrupt Status Register */
#define MTK_QMTK_INT_STATUS 0x1A18
+#define MTK_RX_DONE_DLY BIT(30)
#define MTK_RX_DONE_INT3 BIT(19)
#define MTK_RX_DONE_INT2 BIT(18)
#define MTK_RX_DONE_INT1 BIT(17)
@@ -214,8 +222,7 @@
#define MTK_TX_DONE_INT2 BIT(2)
#define MTK_TX_DONE_INT1 BIT(1)
#define MTK_TX_DONE_INT0 BIT(0)
-#define MTK_RX_DONE_INT (MTK_RX_DONE_INT0 | MTK_RX_DONE_INT1 | \
- MTK_RX_DONE_INT2 | MTK_RX_DONE_INT3)
+#define MTK_RX_DONE_INT MTK_RX_DONE_DLY
#define MTK_TX_DONE_INT (MTK_TX_DONE_INT0 | MTK_TX_DONE_INT1 | \
MTK_TX_DONE_INT2 | MTK_TX_DONE_INT3)
--
2.11.0
