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Subject[PATCH 3/4] net: macb: Add pm runtime support
Date
From: Harini Katakam <harinik@xilinx.com>

Add runtime pm functions and move clock handling there.
If device is suspended and not a wake device, then return from
mdio read/write functions without performing any action because
the clocks are not active.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Harini Katakam <harinik@xilinx.com>
---
Changes from RFC:
Updated pm get sync/put sync calls.
Removed unecessary clk up in mdio helpers.

drivers/net/ethernet/cadence/macb_main.c | 103 +++++++++++++++++++++++++------
1 file changed, 85 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 7ae8d731..09cb4bb 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -36,6 +36,7 @@
#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
@@ -78,6 +79,7 @@
* 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:
@@ -345,6 +347,10 @@ static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
int value;
int err;

+ if (pm_runtime_status_suspended(&bp->pdev->dev) &&
+ !device_may_wakeup(&bp->dev->dev))
+ return -EAGAIN;
+
err = macb_mdio_wait_for_idle(bp);
if (err < 0)
return err;
@@ -370,6 +376,9 @@ static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
struct macb *bp = bus->priv;
int err;

+ if (pm_runtime_status_suspended(&bp->pdev->dev) &&
+ !device_may_wakeup(&bp->dev->dev))
+ return -EAGAIN;

err = macb_mdio_wait_for_idle(bp);
if (err < 0)
@@ -2397,12 +2406,18 @@ 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)
+ goto pm_exit;
+
/* carrier starts down */
netif_carrier_off(dev);

/* if the phy is not yet register, retry later*/
- if (!dev->phydev)
- return -EAGAIN;
+ if (!dev->phydev) {
+ err = -EAGAIN;
+ goto pm_exit;
+ }

/* RX buffers initialization */
macb_init_rx_buffer_size(bp, bufsz);
@@ -2411,7 +2426,7 @@ static int macb_open(struct net_device *dev)
if (err) {
netdev_err(dev, "Unable to allocate DMA memory (error %d)\n",
err);
- return err;
+ goto pm_exit;
}

bp->macbgem_ops.mog_init_rings(bp);
@@ -2428,6 +2443,11 @@ static int macb_open(struct net_device *dev)
if (bp->ptp_info)
bp->ptp_info->ptp_init(dev);

+pm_exit:
+ if (err) {
+ pm_runtime_put_sync(&bp->pdev->dev);
+ return err;
+ }
return 0;
}

@@ -2456,6 +2476,8 @@ 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;
}

@@ -4019,6 +4041,11 @@ 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);
@@ -4150,6 +4177,9 @@ 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:
@@ -4169,6 +4199,9 @@ 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;
}
@@ -4192,11 +4225,16 @@ 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);
+ }
of_node_put(bp->phy_node);
free_netdev(dev);
}
@@ -4217,13 +4255,9 @@ 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;
}
@@ -4234,11 +4268,43 @@ 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);
@@ -4246,12 +4312,13 @@ 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,
--
2.7.4
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