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Message-ID: <AM4PR0401MB226019650A8FB767B11B8B91FF4F0@AM4PR0401MB2260.eurprd04.prod.outlook.com>
Date: Mon, 16 Oct 2017 03:41:00 +0000
From: Andy Duan <fugang.duan@....com>
To: Troy Kisky <troy.kisky@...ndarydevices.com>,
"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"davem@...emloft.net" <davem@...emloft.net>
CC: Fabio Estevam <fabio.estevam@....com>,
"lznuaa@...il.com" <lznuaa@...il.com>,
"andrew@...n.ch" <andrew@...n.ch>
Subject: RE: [PATCH net v2 2/2] net: fec: Let fec_ptp have its own interrupt
routine
From: Troy Kisky <troy.kisky@...ndarydevices.com> Sent: Saturday, October 14, 2017 10:10 AM
>This is better for code locality and should slightly speed up normal interrupts.
>
>This also allows PPS clock output to start working for i.mx7. This is because
>i.mx7 was already using the limit of 3 interrupts, and needed another.
>
>Signed-off-by: Troy Kisky <troy.kisky@...ndarydevices.com>
>
>---
>
>v2: made this change independent of any devicetree change so that old dtbs
>continue to work.
>
>Continue to register ptp clock if interrupt is not found.
>---
> drivers/net/ethernet/freescale/fec.h | 3 +-
> drivers/net/ethernet/freescale/fec_main.c | 25 ++++++----
>drivers/net/ethernet/freescale/fec_ptp.c | 82 ++++++++++++++++++--------
>-----
> 3 files changed, 65 insertions(+), 45 deletions(-)
>
>diff --git a/drivers/net/ethernet/freescale/fec.h
>b/drivers/net/ethernet/freescale/fec.h
>index ede1876a9a19..be56ac1f1ac4 100644
>--- a/drivers/net/ethernet/freescale/fec.h
>+++ b/drivers/net/ethernet/freescale/fec.h
>@@ -582,12 +582,11 @@ struct fec_enet_private {
> u64 ethtool_stats[0];
> };
>
>-void fec_ptp_init(struct platform_device *pdev);
>+void fec_ptp_init(struct platform_device *pdev, int irq_index);
> void fec_ptp_stop(struct platform_device *pdev); void
>fec_ptp_start_cyclecounter(struct net_device *ndev); int fec_ptp_set(struct
>net_device *ndev, struct ifreq *ifr); int fec_ptp_get(struct net_device *ndev,
>struct ifreq *ifr); -uint fec_ptp_check_pps_event(struct fec_enet_private
>*fep);
>
>
>/**********************************************************
>******************/
> #endif /* FEC_H */
>diff --git a/drivers/net/ethernet/freescale/fec_main.c
>b/drivers/net/ethernet/freescale/fec_main.c
>index 3dc2d771a222..21afabbc560f 100644
>--- a/drivers/net/ethernet/freescale/fec_main.c
>+++ b/drivers/net/ethernet/freescale/fec_main.c
>@@ -1602,10 +1602,6 @@ fec_enet_interrupt(int irq, void *dev_id)
> ret = IRQ_HANDLED;
> complete(&fep->mdio_done);
> }
>-
>- if (fep->ptp_clock)
>- if (fec_ptp_check_pps_event(fep))
>- ret = IRQ_HANDLED;
> return ret;
> }
>
>@@ -3325,6 +3321,8 @@ fec_probe(struct platform_device *pdev)
> struct device_node *np = pdev->dev.of_node, *phy_node;
> int num_tx_qs;
> int num_rx_qs;
>+ char irq_name[8];
>+ int irq_cnt;
>
> fec_enet_get_queue_num(pdev, &num_tx_qs, &num_rx_qs);
>
>@@ -3465,18 +3463,27 @@ fec_probe(struct platform_device *pdev)
> if (ret)
> goto failed_reset;
>
>+ irq_cnt = platform_irq_count(pdev);
>+ if (irq_cnt > FEC_IRQ_NUM)
>+ irq_cnt = FEC_IRQ_NUM; /* last for ptp */
>+ else if (irq_cnt == 2)
>+ irq_cnt = 1; /* last for ptp */
>+ else if (irq_cnt <= 0)
>+ irq_cnt = 1; /* Let the for loop fail */
Don't do like this. Don't suppose pps interrupt is the last one.
And if irq_cnt is 1 like imx28/imx5x, the patch will break fec interrupt function.
I suggest to use .platform_get_irq_byname() to get pps(ptp) interrupt like your v1 logic check.
>+
> if (fep->bufdesc_ex)
>- fec_ptp_init(pdev);
>+ fec_ptp_init(pdev, irq_cnt);
>
> ret = fec_enet_init(ndev);
> if (ret)
> goto failed_init;
>
>- for (i = 0; i < FEC_IRQ_NUM; i++) {
>- irq = platform_get_irq(pdev, i);
>+ for (i = 0; i < irq_cnt; i++) {
>+ sprintf(irq_name, "int%d", i);
>+ irq = platform_get_irq_byname(pdev, irq_name);
>+ if (irq < 0)
>+ irq = platform_get_irq(pdev, i);
> if (irq < 0) {
>- if (i)
>- break;
> ret = irq;
> goto failed_irq;
> }
>diff --git a/drivers/net/ethernet/freescale/fec_ptp.c
>b/drivers/net/ethernet/freescale/fec_ptp.c
>index 6ebad3fac81d..3abeee0d16dd 100644
>--- a/drivers/net/ethernet/freescale/fec_ptp.c
>+++ b/drivers/net/ethernet/freescale/fec_ptp.c
>@@ -549,6 +549,37 @@ static void fec_time_keep(struct work_struct *work)
> schedule_delayed_work(&fep->time_keep, HZ); }
>
>+/* This function checks the pps event and reloads the timer compare
>+counter. */ static irqreturn_t fec_ptp_interrupt(int irq, void *dev_id)
>+{
>+ struct net_device *ndev = dev_id;
>+ struct fec_enet_private *fep = netdev_priv(ndev);
>+ u32 val;
>+ u8 channel = fep->pps_channel;
>+ struct ptp_clock_event event;
>+
>+ val = readl(fep->hwp + FEC_TCSR(channel));
>+ if (val & FEC_T_TF_MASK) {
>+ /* Write the next next compare(not the next according the
>spec)
>+ * value to the register
>+ */
>+ writel(fep->next_counter, fep->hwp + FEC_TCCR(channel));
>+ do {
>+ writel(val, fep->hwp + FEC_TCSR(channel));
>+ } while (readl(fep->hwp + FEC_TCSR(channel)) &
>FEC_T_TF_MASK);
>+
>+ /* Update the counter; */
>+ fep->next_counter = (fep->next_counter + fep-
>>reload_period) &
>+ fep->cc.mask;
>+
>+ event.type = PTP_CLOCK_PPS;
>+ ptp_clock_event(fep->ptp_clock, &event);
>+ return IRQ_HANDLED;
>+ }
>+
>+ return IRQ_NONE;
>+}
>+
> /**
> * fec_ptp_init
> * @ndev: The FEC network adapter
>@@ -558,10 +589,12 @@ static void fec_time_keep(struct work_struct *work)
> * cyclecounter init routine and exits.
> */
>
>-void fec_ptp_init(struct platform_device *pdev)
>+void fec_ptp_init(struct platform_device *pdev, int irq_index)
> {
> struct net_device *ndev = platform_get_drvdata(pdev);
> struct fec_enet_private *fep = netdev_priv(ndev);
>+ int irq;
>+ int ret;
>
> fep->ptp_caps.owner = THIS_MODULE;
> snprintf(fep->ptp_caps.name, 16, "fec ptp"); @@ -587,6 +620,20 @@
>void fec_ptp_init(struct platform_device *pdev)
>
> INIT_DELAYED_WORK(&fep->time_keep, fec_time_keep);
>
>+ irq = platform_get_irq_byname(pdev, "ptp");
>+ if (irq < 0)
>+ irq = platform_get_irq(pdev, irq_index);
>+ /* Failure to get an irq is not fatal,
>+ * only the PTP_CLOCK_PPS clock events should stop
>+ */
>+ if (irq >= 0) {
>+ ret = devm_request_irq(&pdev->dev, irq, fec_ptp_interrupt,
>+ 0, pdev->name, ndev);
>+ if (ret < 0)
>+ dev_warn(&pdev->dev, "request for ptp irq
>failed(%d)\n",
>+ ret);
>+ }
>+
> fep->ptp_clock = ptp_clock_register(&fep->ptp_caps, &pdev->dev);
> if (IS_ERR(fep->ptp_clock)) {
> fep->ptp_clock = NULL;
>@@ -605,36 +652,3 @@ void fec_ptp_stop(struct platform_device *pdev)
> if (fep->ptp_clock)
> ptp_clock_unregister(fep->ptp_clock);
> }
>-
>-/**
>- * fec_ptp_check_pps_event
>- * @fep: the fec_enet_private structure handle
>- *
>- * This function check the pps event and reload the timer compare counter.
>- */
>-uint fec_ptp_check_pps_event(struct fec_enet_private *fep) -{
>- u32 val;
>- u8 channel = fep->pps_channel;
>- struct ptp_clock_event event;
>-
>- val = readl(fep->hwp + FEC_TCSR(channel));
>- if (val & FEC_T_TF_MASK) {
>- /* Write the next next compare(not the next according the
>spec)
>- * value to the register
>- */
>- writel(fep->next_counter, fep->hwp + FEC_TCCR(channel));
>- do {
>- writel(val, fep->hwp + FEC_TCSR(channel));
>- } while (readl(fep->hwp + FEC_TCSR(channel)) &
>FEC_T_TF_MASK);
>-
>- /* Update the counter; */
>- fep->next_counter = (fep->next_counter + fep-
>>reload_period) & fep->cc.mask;
>-
>- event.type = PTP_CLOCK_PPS;
>- ptp_clock_event(fep->ptp_clock, &event);
>- return 1;
>- }
>-
>- return 0;
>-}
>--
>2.11.0
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