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| author | Andy Duan <fugang.duan@nxp.com> | 2019-04-09 03:40:56 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-16 19:42:31 +0200 |
| commit | 4bdd88d967f23421ff4f4c98595cb97c012afb2b (patch) | |
| tree | 2f9e14267e83a6c96dc40978fe76fa46ac7a237d | |
| parent | 9aad9f3abc884fcd9ef812da4029b9d40657f0de (diff) | |
| download | linux-stable-4bdd88d967f23421ff4f4c98595cb97c012afb2b.tar.gz linux-stable-4bdd88d967f23421ff4f4c98595cb97c012afb2b.tar.bz2 linux-stable-4bdd88d967f23421ff4f4c98595cb97c012afb2b.zip | |
net: fec: manage ahb clock in runtime pm
[ 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>
| -rw-r--r-- | drivers/net/ethernet/freescale/fec_main.c | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index ce55c8f7f33a..ad3aabc39cc2 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -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 = { |