Re: [RFC PATCH 3/5] net: macb: Add pm runtime support

From: Claudiu Beznea
Date: Thu May 03 2018 - 06:09:47 EST

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On 22.03.2018 15:51, harinikatakamlinux@xxxxxxxxx wrote:
> From: Harini Katakam <harinik@xxxxxxxxxx>
>
> Add runtime pm functions and move clock handling there.
> Enable clocks in mdio read/write functions.
>
> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xxxxxxxxxx>
> Signed-off-by: Harini Katakam <harinik@xxxxxxxxxx>
> ---
> drivers/net/ethernet/cadence/macb_main.c | 105 ++++++++++++++++++++++++++-----
> 1 file changed, 90 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index ae61927..ce75088 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -35,6 +35,7 @@
> #include <linux/ip.h>
> #include <linux/udp.h>
> #include <linux/tcp.h>
> +#include <linux/pm_runtime.h>
> #include "macb.h"
>
> #define MACB_RX_BUFFER_SIZE 128
> @@ -77,6 +78,7 @@
> * 1 frame time (10 Mbits/s, full-duplex, ignoring collisions)
> */
> #define MACB_HALT_TIMEOUT 1230
> +#define MACB_PM_TIMEOUT 100 /* ms */
>
> /* DMA buffer descriptor might be different size
> * depends on hardware configuration:
> @@ -321,8 +323,13 @@ static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
> {
> struct macb *bp = bus->priv;
> int value;
> + int err;
> ulong timeout;
>
> + err = pm_runtime_get_sync(&bp->pdev->dev);
> + if (err < 0)

You have to call pm_runtime_put_noidle() or something similar to decrement the
dev->power.usage_count.

> + return err;
> +
> timeout = jiffies + msecs_to_jiffies(1000);
> /* wait for end of transfer */
> do {
> @@ -334,6 +341,8 @@ static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
>
> if (time_after_eq(jiffies, timeout)) {
> netdev_err(bp->dev, "wait for end of transfer timed out\n");

For this:

> + pm_runtime_mark_last_busy(&bp->pdev->dev);
> + pm_runtime_put_autosuspend(&bp->pdev->dev);> return -ETIMEDOUT;
> }
>
> @@ -354,11 +363,15 @@ static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
>
> if (time_after_eq(jiffies, timeout)) {
> netdev_err(bp->dev, "wait for end of transfer timed out\n");

And this:

> + pm_runtime_mark_last_busy(&bp->pdev->dev);
> + pm_runtime_put_autosuspend(&bp->pdev->dev);
> return -ETIMEDOUT;

I would use a "goto" instruction, e.g.:
value = -ETIMEDOUT;
goto out;

> }
>
> value = MACB_BFEXT(DATA, macb_readl(bp, MAN));
>

out:
> + pm_runtime_mark_last_busy(&bp->pdev->dev);
> + pm_runtime_put_autosuspend(&bp->pdev->dev);
> return value;
> }
>
> @@ -366,8 +379,13 @@ static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
> u16 value)
> {
> struct macb *bp = bus->priv;
> + int err;
> ulong timeout;
>
> + err = pm_runtime_get_sync(&bp->pdev->dev);> + if (err < 0)

Ditto

> + return err;
> +
> timeout = jiffies + msecs_to_jiffies(1000);
> /* wait for end of transfer */
> do {
> @@ -379,6 +397,8 @@ static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
>
> if (time_after_eq(jiffies, timeout)) {
> netdev_err(bp->dev, "wait for end of transfer timed out\n");

Ditto

> + pm_runtime_mark_last_busy(&bp->pdev->dev);
> + pm_runtime_put_autosuspend(&bp->pdev->dev);
> return -ETIMEDOUT;
> }
>
> @@ -400,9 +420,13 @@ static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
>
> if (time_after_eq(jiffies, timeout)) {
> netdev_err(bp->dev, "wait for end of transfer timed out\n");
> + pm_runtime_mark_last_busy(&bp->pdev->dev);
> + pm_runtime_put_autosuspend(&bp->pdev->dev);

Ditto

> return -ETIMEDOUT;
> }
>
> + pm_runtime_mark_last_busy(&bp->pdev->dev);
> + pm_runtime_put_autosuspend(&bp->pdev->dev);
> return 0;
> }
>
> @@ -2338,6 +2362,10 @@ static int macb_open(struct net_device *dev)
>
> netdev_dbg(bp->dev, "open\n");
>
> + err = pm_runtime_get_sync(&bp->pdev->dev);
> + if (err < 0)

Ditto

> + return err;
> +

Below, in macb_open() you have a return err; case:
err = macb_alloc_consistent(bp);
if (err) {
netdev_err(dev, "Unable to allocate DMA memory (error %d)\n",
err);
return err;
}

You have to undo pm_runtime_get_sync() with pm_runtime_put_sync() or something
similar to decrement dev->power.usage_count.

> /* carrier starts down */
> netif_carrier_off(dev);
>
> @@ -2397,6 +2425,8 @@ static int macb_close(struct net_device *dev)
> if (bp->ptp_info)
> bp->ptp_info->ptp_remove(dev);
>
> + pm_runtime_put(&bp->pdev->dev);
> +
> return 0;
> }
>
> @@ -3949,6 +3979,11 @@ static int macb_probe(struct platform_device *pdev)
> if (err)
> return err;
>
> + pm_runtime_set_autosuspend_delay(&pdev->dev, MACB_PM_TIMEOUT);
> + pm_runtime_use_autosuspend(&pdev->dev);
> + pm_runtime_get_noresume(&pdev->dev);
> + pm_runtime_set_active(&pdev->dev);
> + pm_runtime_enable(&pdev->dev);
> native_io = hw_is_native_io(mem);
>
> macb_probe_queues(mem, native_io, &queue_mask, &num_queues);
> @@ -4062,6 +4097,9 @@ static int macb_probe(struct platform_device *pdev)
> macb_is_gem(bp) ? "GEM" : "MACB", macb_readl(bp, MID),
> dev->base_addr, dev->irq, dev->dev_addr);
>
> + pm_runtime_mark_last_busy(&bp->pdev->dev);
> + pm_runtime_put_autosuspend(&bp->pdev->dev);
> +
> return 0;
>
> err_out_unregister_mdio:
> @@ -4081,6 +4119,9 @@ static int macb_probe(struct platform_device *pdev)
> clk_disable_unprepare(pclk);
> clk_disable_unprepare(rx_clk);
> clk_disable_unprepare(tsu_clk);
> + pm_runtime_disable(&pdev->dev);
> + pm_runtime_set_suspended(&pdev->dev);
> + pm_runtime_dont_use_autosuspend(&pdev->dev);
>
> return err;
> }
> @@ -4104,11 +4145,16 @@ static int macb_remove(struct platform_device *pdev)
> mdiobus_free(bp->mii_bus);
>
> unregister_netdev(dev);
> - clk_disable_unprepare(bp->tx_clk);
> - clk_disable_unprepare(bp->hclk);
> - clk_disable_unprepare(bp->pclk);
> - clk_disable_unprepare(bp->rx_clk);
> - clk_disable_unprepare(bp->tsu_clk);
> + pm_runtime_disable(&pdev->dev);
> + pm_runtime_dont_use_autosuspend(&pdev->dev);
> + if (!pm_runtime_suspended(&pdev->dev)) {
> + clk_disable_unprepare(bp->tx_clk);
> + clk_disable_unprepare(bp->hclk);
> + clk_disable_unprepare(bp->pclk);
> + clk_disable_unprepare(bp->rx_clk);
> + clk_disable_unprepare(bp->tsu_clk);
> + pm_runtime_set_suspended(&pdev->dev);

This is driver remove function. Shouldn't clocks be removed?

> + }> of_node_put(bp->phy_node);
> free_netdev(dev);
> }
> @@ -4129,13 +4175,9 @@ static int __maybe_unused macb_suspend(struct device *dev)
> macb_writel(bp, IER, MACB_BIT(WOL));
> macb_writel(bp, WOL, MACB_BIT(MAG));
> enable_irq_wake(bp->queues[0].irq);
> - } else {
> - clk_disable_unprepare(bp->tx_clk);
> - clk_disable_unprepare(bp->hclk);
> - clk_disable_unprepare(bp->pclk);
> - clk_disable_unprepare(bp->rx_clk);
> }
> - clk_disable_unprepare(bp->tsu_clk);
> +
> + pm_runtime_force_suspend(dev);
>
> return 0;
> }
> @@ -4146,11 +4188,43 @@ static int __maybe_unused macb_resume(struct device *dev)
> struct net_device *netdev = platform_get_drvdata(pdev);
> struct macb *bp = netdev_priv(netdev);
>
> + pm_runtime_force_resume(dev);
> +
> if (bp->wol & MACB_WOL_ENABLED) {
> macb_writel(bp, IDR, MACB_BIT(WOL));
> macb_writel(bp, WOL, 0);
> disable_irq_wake(bp->queues[0].irq);
> - } else {
> + }
> +
> + netif_device_attach(netdev);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused macb_runtime_suspend(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct net_device *netdev = platform_get_drvdata(pdev);
> + struct macb *bp = netdev_priv(netdev);
> +
> + if (!(device_may_wakeup(&bp->dev->dev))) {
> + clk_disable_unprepare(bp->tx_clk);
> + clk_disable_unprepare(bp->hclk);
> + clk_disable_unprepare(bp->pclk);
> + clk_disable_unprepare(bp->rx_clk);
> + }
> + clk_disable_unprepare(bp->tsu_clk);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused macb_runtime_resume(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct net_device *netdev = platform_get_drvdata(pdev);
> + struct macb *bp = netdev_priv(netdev);
> +
> + if (!(device_may_wakeup(&bp->dev->dev))) {
> clk_prepare_enable(bp->pclk);
> clk_prepare_enable(bp->hclk);
> clk_prepare_enable(bp->tx_clk);
> @@ -4158,12 +4232,13 @@ static int __maybe_unused macb_resume(struct device *dev)
> }
> clk_prepare_enable(bp->tsu_clk);
>
> - netif_device_attach(netdev);
> -
> return 0;
> }
>
> -static SIMPLE_DEV_PM_OPS(macb_pm_ops, macb_suspend, macb_resume);
> +static const struct dev_pm_ops macb_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(macb_suspend, macb_resume)
> + SET_RUNTIME_PM_OPS(macb_runtime_suspend, macb_runtime_resume, NULL)
> +};
>
> static struct platform_driver macb_driver = {
> .probe = macb_probe,
>

Next message: Claudiu Beznea: "Re: [RFC PATCH 4/5] net: macb: Add support for suspend/resume with full power down"
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Next in thread: Harini Katakam: "Re: [RFC PATCH 3/5] net: macb: Add pm runtime support"
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