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Message-ID: <BN3PR0301MB08490760B426D4889AFF2434817C0@BN3PR0301MB0849.namprd03.prod.outlook.com>
Date: Fri, 14 Aug 2015 08:25:30 +0000
From: Peter Chen <Peter.Chen@...escale.com>
To: Lucas Stach <l.stach@...gutronix.de>
CC: "davem@...emloft.net" <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Duan Andy <fugang.duan@...escale.com>,
"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
Fabio Estevam <Fabio.Estevam@...escale.com>,
"tyler.baker@...aro.org" <tyler.baker@...aro.org>,
Andrew Lunn <andrew@...n.ch>
Subject: RE: [PATCH 1/1] Revert "net: fec: Ensure clocks are enabled while
using mdio bus"
>
> Am Freitag, den 14.08.2015, 13:47 +0800 schrieb Peter Chen:
> > It causes the i.mx6sx sdb board hang when using nfsroot during boots
> > up at v4.2-rc6.
> >
> > This reverts commit 8fff755e9f8d0f70a595e79f248695ce6aef5cc3.
> >
> > Cc: netdev@...r.kernel.org
> > Cc: Fugang Duan <B38611@...escale.com>
> > Cc: shawn.guo@...aro.org
> > Cc: fabio.estevam@...escale.com
> > Cc: tyler.baker@...aro.org
> > Cc: Lucas Stach <l.stach@...gutronix.de>
> > Cc: Andrew Lunn <andrew@...n.ch>
> > Signed-off-by: Peter Chen <peter.chen@...escale.com>
> > ---
> >
> > According to Fugang Duan, the i.mx series has different clock control
> > sequence among SoCs, this patch may only consider certain SoCs.
> >
> Sorry, but NACK.
>
> Please test current mainline (what will become v4.2-rc7). There is already a
> patch in that fixes i.MX27 and probably fixes the same problem on i.MX6SX.
>
Would you help point to me which commit and at which tree?
Peter
> > drivers/net/ethernet/freescale/fec_main.c | 89
> > +++++--------------------------
> > 1 file changed, 13 insertions(+), 76 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/freescale/fec_main.c
> > b/drivers/net/ethernet/freescale/fec_main.c
> > index 32e3807c..5e8b837 100644
> > --- a/drivers/net/ethernet/freescale/fec_main.c
> > +++ b/drivers/net/ethernet/freescale/fec_main.c
> > @@ -24,7 +24,6 @@
> > #include <linux/module.h>
> > #include <linux/kernel.h>
> > #include <linux/string.h>
> > -#include <linux/pm_runtime.h>
> > #include <linux/ptrace.h>
> > #include <linux/errno.h>
> > #include <linux/ioport.h>
> > @@ -78,7 +77,6 @@ static void fec_enet_itr_coal_init(struct net_device
> *ndev);
> > #define FEC_ENET_RAEM_V 0x8
> > #define FEC_ENET_RAFL_V 0x8
> > #define FEC_ENET_OPD_V 0xFFF0
> > -#define FEC_MDIO_PM_TIMEOUT 100 /* ms */
> >
> > static struct platform_device_id fec_devtype[] = {
> > {
> > @@ -1769,13 +1767,7 @@ static void fec_enet_adjust_link(struct
> > net_device *ndev) static int fec_enet_mdio_read(struct mii_bus *bus,
> > int mii_id, int regnum) {
> > struct fec_enet_private *fep = bus->priv;
> > - struct device *dev = &fep->pdev->dev;
> > unsigned long time_left;
> > - int ret = 0;
> > -
> > - ret = pm_runtime_get_sync(dev);
> > - if (IS_ERR_VALUE(ret))
> > - return ret;
> >
> > fep->mii_timeout = 0;
> > init_completion(&fep->mdio_done);
> > @@ -1791,30 +1783,18 @@ static int fec_enet_mdio_read(struct mii_bus
> *bus, int mii_id, int regnum)
> > if (time_left == 0) {
> > fep->mii_timeout = 1;
> > netdev_err(fep->netdev, "MDIO read timeout\n");
> > - ret = -ETIMEDOUT;
> > - goto out;
> > + return -ETIMEDOUT;
> > }
> >
> > - ret = FEC_MMFR_DATA(readl(fep->hwp + FEC_MII_DATA));
> > -
> > -out:
> > - pm_runtime_mark_last_busy(dev);
> > - pm_runtime_put_autosuspend(dev);
> > -
> > - return ret;
> > + /* return value */
> > + return FEC_MMFR_DATA(readl(fep->hwp + FEC_MII_DATA));
> > }
> >
> > static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
> > u16 value)
> > {
> > struct fec_enet_private *fep = bus->priv;
> > - struct device *dev = &fep->pdev->dev;
> > unsigned long time_left;
> > - int ret = 0;
> > -
> > - ret = pm_runtime_get_sync(dev);
> > - if (IS_ERR_VALUE(ret))
> > - return ret;
> >
> > fep->mii_timeout = 0;
> > init_completion(&fep->mdio_done);
> > @@ -1831,13 +1811,10 @@ static int fec_enet_mdio_write(struct mii_bus
> *bus, int mii_id, int regnum,
> > if (time_left == 0) {
> > fep->mii_timeout = 1;
> > netdev_err(fep->netdev, "MDIO write timeout\n");
> > - ret = -ETIMEDOUT;
> > + return -ETIMEDOUT;
> > }
> >
> > - pm_runtime_mark_last_busy(dev);
> > - pm_runtime_put_autosuspend(dev);
> > -
> > - return ret;
> > + return 0;
> > }
> >
> > static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
> > @@ -1849,6 +1826,9 @@ static int fec_enet_clk_enable(struct net_device
> *ndev, bool enable)
> > ret = clk_prepare_enable(fep->clk_ahb);
> > if (ret)
> > return ret;
> > + ret = clk_prepare_enable(fep->clk_ipg);
> > + if (ret)
> > + goto failed_clk_ipg;
> > if (fep->clk_enet_out) {
> > ret = clk_prepare_enable(fep->clk_enet_out);
> > if (ret)
> > @@ -1872,6 +1852,7 @@ static int fec_enet_clk_enable(struct net_device
> *ndev, bool enable)
> > }
> > } else {
> > clk_disable_unprepare(fep->clk_ahb);
> > + clk_disable_unprepare(fep->clk_ipg);
> > if (fep->clk_enet_out)
> > clk_disable_unprepare(fep->clk_enet_out);
> > if (fep->clk_ptp) {
> > @@ -1893,6 +1874,8 @@ failed_clk_ptp:
> > if (fep->clk_enet_out)
> > clk_disable_unprepare(fep->clk_enet_out);
> > failed_clk_enet_out:
> > + clk_disable_unprepare(fep->clk_ipg);
> > +failed_clk_ipg:
> > clk_disable_unprepare(fep->clk_ahb);
> >
> > return ret;
> > @@ -2864,14 +2847,10 @@ fec_enet_open(struct net_device *ndev)
> > struct fec_enet_private *fep = netdev_priv(ndev);
> > int ret;
> >
> > - ret = pm_runtime_get_sync(&fep->pdev->dev);
> > - if (IS_ERR_VALUE(ret))
> > - return ret;
> > -
> > pinctrl_pm_select_default_state(&fep->pdev->dev);
> > ret = fec_enet_clk_enable(ndev, true);
> > if (ret)
> > - goto clk_enable;
> > + return ret;
> >
> > /* I should reset the ring buffers here, but I don't yet know
> > * a simple way to do that.
> > @@ -2902,9 +2881,6 @@ err_enet_mii_probe:
> > fec_enet_free_buffers(ndev);
> > err_enet_alloc:
> > fec_enet_clk_enable(ndev, false);
> > -clk_enable:
> > - pm_runtime_mark_last_busy(&fep->pdev->dev);
> > - pm_runtime_put_autosuspend(&fep->pdev->dev);
> > pinctrl_pm_select_sleep_state(&fep->pdev->dev);
> > return ret;
> > }
> > @@ -2927,9 +2903,6 @@ fec_enet_close(struct net_device *ndev)
> >
> > fec_enet_clk_enable(ndev, false);
> > pinctrl_pm_select_sleep_state(&fep->pdev->dev);
> > - pm_runtime_mark_last_busy(&fep->pdev->dev);
> > - pm_runtime_put_autosuspend(&fep->pdev->dev);
> > -
> > fec_enet_free_buffers(ndev);
> >
> > return 0;
> > @@ -3415,10 +3388,6 @@ fec_probe(struct platform_device *pdev)
> > if (ret)
> > goto failed_clk;
> >
> > - ret = clk_prepare_enable(fep->clk_ipg);
> > - if (ret)
> > - goto failed_clk_ipg;
> > -
> > fep->reg_phy = devm_regulator_get(&pdev->dev, "phy");
> > if (!IS_ERR(fep->reg_phy)) {
> > ret = regulator_enable(fep->reg_phy); @@ -3431,11 +3400,6
> @@
> > fec_probe(struct platform_device *pdev)
> > fep->reg_phy = NULL;
> > }
> >
> > - pm_runtime_set_autosuspend_delay(&pdev->dev,
> FEC_MDIO_PM_TIMEOUT);
> > - pm_runtime_use_autosuspend(&pdev->dev);
> > - pm_runtime_set_active(&pdev->dev);
> > - pm_runtime_enable(&pdev->dev);
> > -
> > fec_reset_phy(pdev);
> >
> > if (fep->bufdesc_ex)
> > @@ -3483,10 +3447,6 @@ fec_probe(struct platform_device *pdev)
> >
> > fep->rx_copybreak = COPYBREAK_DEFAULT;
> > INIT_WORK(&fep->tx_timeout_work, fec_enet_timeout_work);
> > -
> > - pm_runtime_mark_last_busy(&pdev->dev);
> > - pm_runtime_put_autosuspend(&pdev->dev);
> > -
> > return 0;
> >
> > failed_register:
> > @@ -3498,8 +3458,6 @@ failed_init:
> > if (fep->reg_phy)
> > regulator_disable(fep->reg_phy);
> > failed_regulator:
> > - clk_disable_unprepare(fep->clk_ipg);
> > -failed_clk_ipg:
> > fec_enet_clk_enable(ndev, false);
> > failed_clk:
> > failed_phy:
> > @@ -3609,28 +3567,7 @@ failed_clk:
> > return ret;
> > }
> >
> > -static int __maybe_unused fec_runtime_suspend(struct device *dev) -{
> > - struct net_device *ndev = dev_get_drvdata(dev);
> > - struct fec_enet_private *fep = netdev_priv(ndev);
> > -
> > - clk_disable_unprepare(fep->clk_ipg);
> > -
> > - return 0;
> > -}
> > -
> > -static int __maybe_unused fec_runtime_resume(struct device *dev) -{
> > - struct net_device *ndev = dev_get_drvdata(dev);
> > - struct fec_enet_private *fep = netdev_priv(ndev);
> > -
> > - return clk_prepare_enable(fep->clk_ipg);
> > -}
> > -
> > -static const struct dev_pm_ops fec_pm_ops = {
> > - SET_SYSTEM_SLEEP_PM_OPS(fec_suspend, fec_resume)
> > - SET_RUNTIME_PM_OPS(fec_runtime_suspend, fec_runtime_resume,
> NULL)
> > -};
> > +static SIMPLE_DEV_PM_OPS(fec_pm_ops, fec_suspend, fec_resume);
> >
> > static struct platform_driver fec_driver = {
> > .driver = {
>
> --
> Pengutronix e.K. | Lucas Stach |
> Industrial Linux Solutions | http://www.pengutronix.de/ |
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