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net: fec: manage ahb clock in runtime pm

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[ Upstream commit d7c3a206e6338e4ccdf030719dec028e26a521d5 ]

Some SOC like i.MX6SX clock have some limits:
- ahb clock should be disabled before ipg.
- ahb and ipg clocks are required for MAC MII bus.
So, move the ahb clock to runtime management together with
ipg clock.

Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
This commit is contained in:
Andy Duan 2019-04-09 03:40:56 +00:00 committed by Greg Kroah-Hartman
parent 9aad9f3abc
commit 4bdd88d967
1 changed files with 21 additions and 9 deletions
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30
drivers/net/ethernet/freescale/fec_main.c
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@ -1851,13 +1851,9 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
int ret;
if (enable) {
ret = clk_prepare_enable(fep->clk_ahb);
if (ret)
return ret;
ret = clk_prepare_enable(fep->clk_enet_out);
if (ret)
goto failed_clk_enet_out;
return ret;
if (fep->clk_ptp) {
mutex_lock(&fep->ptp_clk_mutex);
@ -1875,7 +1871,6 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
if (ret)
goto failed_clk_ref;
} else {
clk_disable_unprepare(fep->clk_ahb);
clk_disable_unprepare(fep->clk_enet_out);
if (fep->clk_ptp) {
mutex_lock(&fep->ptp_clk_mutex);
@ -1894,8 +1889,6 @@ failed_clk_ref:
failed_clk_ptp:
if (fep->clk_enet_out)
clk_disable_unprepare(fep->clk_enet_out);
failed_clk_enet_out:
clk_disable_unprepare(fep->clk_ahb);
return ret;
}
@ -3455,6 +3448,9 @@ fec_probe(struct platform_device *pdev)
ret = clk_prepare_enable(fep->clk_ipg);
if (ret)
goto failed_clk_ipg;
ret = clk_prepare_enable(fep->clk_ahb);
if (ret)
goto failed_clk_ahb;
fep->reg_phy = devm_regulator_get(&pdev->dev, "phy");
if (!IS_ERR(fep->reg_phy)) {
@ -3546,6 +3542,9 @@ failed_reset:
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
failed_regulator:
clk_disable_unprepare(fep->clk_ahb);
failed_clk_ahb:
clk_disable_unprepare(fep->clk_ipg);
failed_clk_ipg:
fec_enet_clk_enable(ndev, false);
failed_clk:
@ -3669,6 +3668,7 @@ 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_ahb);
clk_disable_unprepare(fep->clk_ipg);
return 0;
@ -3678,8 +3678,20 @@ 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);
int ret;
return clk_prepare_enable(fep->clk_ipg);
ret = clk_prepare_enable(fep->clk_ahb);
if (ret)
return ret;
ret = clk_prepare_enable(fep->clk_ipg);
if (ret)
goto failed_clk_ipg;
return 0;
failed_clk_ipg:
clk_disable_unprepare(fep->clk_ahb);
return ret;
}
static const struct dev_pm_ops fec_pm_ops = {