* [PATCH] net: ethernet: ti: am65-cpsw-nuss: fix irqs type
@ 2020-05-05 16:31 Grygorii Strashko
2020-05-07 0:53 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Grygorii Strashko @ 2020-05-05 16:31 UTC (permalink / raw)
To: David S. Miller
Cc: netdev, Sekhar Nori, linux-kernel, linux-arm-kernel,
Murali Karicheri, Grygorii Strashko
The K3 INTA driver, which is source TX/RX IRQs for CPSW NUSS, defines IRQs
triggering type as EDGE by default, but triggering type for CPSW NUSS TX/RX
IRQs has to be LEVEL as the EDGE triggering type may cause unnecessary IRQs
triggering and NAPI scheduling for empty queues. It was discovered with
RT-kernel.
Fix it by explicitly specifying CPSW NUSS TX/RX IRQ type as
IRQF_TRIGGER_HIGH.
Fixes: 93a76530316a ("net: ethernet: ti: introduce am65x/j721e gigabit eth subsystem driver")
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
drivers/net/ethernet/ti/am65-cpsw-nuss.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 2bf56733ba94..2517ffba8178 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -1719,7 +1719,8 @@ static int am65_cpsw_nuss_ndev_add_napi_2g(struct am65_cpsw_common *common)
ret = devm_request_irq(dev, tx_chn->irq,
am65_cpsw_nuss_tx_irq,
- 0, tx_chn->tx_chn_name, tx_chn);
+ IRQF_TRIGGER_HIGH,
+ tx_chn->tx_chn_name, tx_chn);
if (ret) {
dev_err(dev, "failure requesting tx%u irq %u, %d\n",
tx_chn->id, tx_chn->irq, ret);
@@ -1744,7 +1745,7 @@ static int am65_cpsw_nuss_ndev_reg_2g(struct am65_cpsw_common *common)
ret = devm_request_irq(dev, common->rx_chns.irq,
am65_cpsw_nuss_rx_irq,
- 0, dev_name(dev), common);
+ IRQF_TRIGGER_HIGH, dev_name(dev), common);
if (ret) {
dev_err(dev, "failure requesting rx irq %u, %d\n",
common->rx_chns.irq, ret);
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] net: ethernet: ti: am65-cpsw-nuss: fix irqs type
2020-05-05 16:31 [PATCH] net: ethernet: ti: am65-cpsw-nuss: fix irqs type Grygorii Strashko
@ 2020-05-07 0:53 ` David Miller
0 siblings, 0 replies; 2+ messages in thread
From: David Miller @ 2020-05-07 0:53 UTC (permalink / raw)
To: grygorii.strashko
Cc: netdev, nsekhar, linux-kernel, linux-arm-kernel, m-karicheri2
From: Grygorii Strashko <grygorii.strashko@ti.com>
Date: Tue, 5 May 2020 19:31:26 +0300
> The K3 INTA driver, which is source TX/RX IRQs for CPSW NUSS, defines IRQs
> triggering type as EDGE by default, but triggering type for CPSW NUSS TX/RX
> IRQs has to be LEVEL as the EDGE triggering type may cause unnecessary IRQs
> triggering and NAPI scheduling for empty queues. It was discovered with
> RT-kernel.
>
> Fix it by explicitly specifying CPSW NUSS TX/RX IRQ type as
> IRQF_TRIGGER_HIGH.
>
> Fixes: 93a76530316a ("net: ethernet: ti: introduce am65x/j721e gigabit eth subsystem driver")
> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Applied, thanks.
^ permalink raw reply [flat|nested] 2+ messages in thread
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