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net: fec: optimize the clock management to save power
Add below clock management to save fec power: - After probe, disable all clocks incluing ipg, ahb, enet_out, ptp clock. - Open ethx interface enable necessary clocks. Close ethx interface disable all clocks. The patch also encapsulates the all enet clocks enable/disable to .fec_enet_clk_enable(), which can reduce the repetitional code in driver. Signed-off-by: Fugang Duan <B38611@freescale.com> Acked-by: Frank Li <Frank.li@freescale.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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fddb88723c
commit
e8fcfcd568
@ -1255,6 +1255,49 @@ static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
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return 0;
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}
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static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
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{
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struct fec_enet_private *fep = netdev_priv(ndev);
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int ret;
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if (enable) {
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ret = clk_prepare_enable(fep->clk_ahb);
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if (ret)
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return ret;
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ret = clk_prepare_enable(fep->clk_ipg);
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if (ret)
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goto failed_clk_ipg;
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if (fep->clk_enet_out) {
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ret = clk_prepare_enable(fep->clk_enet_out);
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if (ret)
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goto failed_clk_enet_out;
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}
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if (fep->clk_ptp) {
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ret = clk_prepare_enable(fep->clk_ptp);
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if (ret)
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goto failed_clk_ptp;
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}
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} else {
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clk_disable_unprepare(fep->clk_ahb);
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clk_disable_unprepare(fep->clk_ipg);
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if (fep->clk_enet_out)
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clk_disable_unprepare(fep->clk_enet_out);
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if (fep->clk_ptp)
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clk_disable_unprepare(fep->clk_ptp);
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}
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return 0;
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failed_clk_ptp:
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if (fep->clk_enet_out)
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clk_disable_unprepare(fep->clk_enet_out);
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failed_clk_enet_out:
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clk_disable_unprepare(fep->clk_ipg);
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failed_clk_ipg:
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clk_disable_unprepare(fep->clk_ahb);
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return ret;
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}
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static int fec_enet_mii_probe(struct net_device *ndev)
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{
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struct fec_enet_private *fep = netdev_priv(ndev);
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@ -1773,6 +1816,10 @@ fec_enet_open(struct net_device *ndev)
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struct fec_enet_private *fep = netdev_priv(ndev);
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int ret;
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ret = fec_enet_clk_enable(ndev, true);
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if (ret)
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return ret;
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/* I should reset the ring buffers here, but I don't yet know
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* a simple way to do that.
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*/
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@ -1811,6 +1858,7 @@ fec_enet_close(struct net_device *ndev)
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phy_disconnect(fep->phy_dev);
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}
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fec_enet_clk_enable(ndev, false);
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fec_enet_free_buffers(ndev);
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return 0;
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@ -2164,26 +2212,10 @@ fec_probe(struct platform_device *pdev)
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fep->bufdesc_ex = 0;
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}
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ret = clk_prepare_enable(fep->clk_ahb);
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ret = fec_enet_clk_enable(ndev, true);
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if (ret)
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goto failed_clk;
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ret = clk_prepare_enable(fep->clk_ipg);
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if (ret)
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goto failed_clk_ipg;
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if (fep->clk_enet_out) {
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ret = clk_prepare_enable(fep->clk_enet_out);
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if (ret)
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goto failed_clk_enet_out;
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}
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if (fep->clk_ptp) {
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ret = clk_prepare_enable(fep->clk_ptp);
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if (ret)
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goto failed_clk_ptp;
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}
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fep->reg_phy = devm_regulator_get(&pdev->dev, "phy");
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if (!IS_ERR(fep->reg_phy)) {
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ret = regulator_enable(fep->reg_phy);
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@ -2225,6 +2257,7 @@ fec_probe(struct platform_device *pdev)
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/* Carrier starts down, phylib will bring it up */
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netif_carrier_off(ndev);
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fec_enet_clk_enable(ndev, false);
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ret = register_netdev(ndev);
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if (ret)
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@ -2244,15 +2277,7 @@ failed_init:
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if (fep->reg_phy)
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regulator_disable(fep->reg_phy);
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failed_regulator:
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if (fep->clk_ptp)
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clk_disable_unprepare(fep->clk_ptp);
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failed_clk_ptp:
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if (fep->clk_enet_out)
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clk_disable_unprepare(fep->clk_enet_out);
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failed_clk_enet_out:
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clk_disable_unprepare(fep->clk_ipg);
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failed_clk_ipg:
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clk_disable_unprepare(fep->clk_ahb);
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fec_enet_clk_enable(ndev, false);
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failed_clk:
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failed_ioremap:
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free_netdev(ndev);
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@ -2272,14 +2297,9 @@ fec_drv_remove(struct platform_device *pdev)
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del_timer_sync(&fep->time_keep);
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if (fep->reg_phy)
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regulator_disable(fep->reg_phy);
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if (fep->clk_ptp)
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clk_disable_unprepare(fep->clk_ptp);
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if (fep->ptp_clock)
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ptp_clock_unregister(fep->ptp_clock);
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if (fep->clk_enet_out)
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clk_disable_unprepare(fep->clk_enet_out);
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clk_disable_unprepare(fep->clk_ipg);
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clk_disable_unprepare(fep->clk_ahb);
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fec_enet_clk_enable(ndev, false);
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free_netdev(ndev);
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return 0;
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@ -2296,12 +2316,7 @@ fec_suspend(struct device *dev)
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fec_stop(ndev);
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netif_device_detach(ndev);
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}
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if (fep->clk_ptp)
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clk_disable_unprepare(fep->clk_ptp);
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if (fep->clk_enet_out)
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clk_disable_unprepare(fep->clk_enet_out);
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clk_disable_unprepare(fep->clk_ipg);
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clk_disable_unprepare(fep->clk_ahb);
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fec_enet_clk_enable(ndev, false);
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if (fep->reg_phy)
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regulator_disable(fep->reg_phy);
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@ -2322,25 +2337,9 @@ fec_resume(struct device *dev)
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return ret;
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}
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ret = clk_prepare_enable(fep->clk_ahb);
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ret = fec_enet_clk_enable(ndev, true);
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if (ret)
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goto failed_clk_ahb;
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ret = clk_prepare_enable(fep->clk_ipg);
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if (ret)
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goto failed_clk_ipg;
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if (fep->clk_enet_out) {
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ret = clk_prepare_enable(fep->clk_enet_out);
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if (ret)
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goto failed_clk_enet_out;
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}
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if (fep->clk_ptp) {
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ret = clk_prepare_enable(fep->clk_ptp);
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if (ret)
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goto failed_clk_ptp;
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}
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goto failed_clk;
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if (netif_running(ndev)) {
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fec_restart(ndev, fep->full_duplex);
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@ -2349,14 +2348,7 @@ fec_resume(struct device *dev)
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return 0;
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failed_clk_ptp:
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if (fep->clk_enet_out)
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clk_disable_unprepare(fep->clk_enet_out);
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failed_clk_enet_out:
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clk_disable_unprepare(fep->clk_ipg);
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failed_clk_ipg:
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clk_disable_unprepare(fep->clk_ahb);
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failed_clk_ahb:
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failed_clk:
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if (fep->reg_phy)
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regulator_disable(fep->reg_phy);
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return ret;
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