That clock is purely dedicated for the PTP feature of DW *MAC. From the driver readability and maintainability point of the view it's better to have it enabled/disable in the PTP interface init/release methods. Let's do that by moving the clock prepare/enable procedure invocation to the stmmac_init_ptp() method and adding the clock disable/unprepare function call to stmmac_release_ptp(). Since the clock is now handled in the framework of the PTP-interface related initializers/de-initializers we need to call the stmmac_release_ptp() method in the HW-setup antagonist - stmmac_hw_teardown(). Thus call the later one when the network device is closed to clean the PTP-interface too.
Signed-off-by: Serge Semin <sergey.se...@baikalelectronics.ru> --- .../net/ethernet/stmicro/stmmac/stmmac_main.c | 25 +++++++++++++------ 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index f3ced94b3f4e..d6446aa712e1 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -761,10 +761,18 @@ static int stmmac_hwtstamp_get(struct net_device *dev, struct ifreq *ifr) static int stmmac_init_ptp(struct stmmac_priv *priv) { bool xmac = priv->plat->has_gmac4 || priv->plat->has_xgmac; + int ret; if (!(priv->dma_cap.time_stamp || priv->dma_cap.atime_stamp)) return -EOPNOTSUPP; + ret = clk_prepare_enable(priv->plat->clk_ptp_ref); + if (ret) { + netdev_warn(priv->dev, "failed to enable PTP ref-clock: %d\n", + ret); + return ret; + } + priv->adv_ts = 0; /* Check if adv_ts can be enabled for dwmac 4.x / xgmac core */ if (xmac && priv->dma_cap.atime_stamp) @@ -790,8 +798,12 @@ static int stmmac_init_ptp(struct stmmac_priv *priv) static void stmmac_release_ptp(struct stmmac_priv *priv) { - clk_disable_unprepare(priv->plat->clk_ptp_ref); + if (!(priv->dma_cap.time_stamp || priv->dma_cap.atime_stamp)) + return; + stmmac_ptp_unregister(priv); + + clk_disable_unprepare(priv->plat->clk_ptp_ref); } /** @@ -2716,10 +2728,6 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp) stmmac_mmc_setup(priv); if (init_ptp) { - ret = clk_prepare_enable(priv->plat->clk_ptp_ref); - if (ret < 0) - netdev_warn(priv->dev, "failed to enable PTP reference clock: %d\n", ret); - ret = stmmac_init_ptp(priv); if (ret == -EOPNOTSUPP) netdev_warn(priv->dev, "PTP not supported by HW\n"); @@ -2784,7 +2792,7 @@ static void stmmac_hw_teardown(struct net_device *dev) { struct stmmac_priv *priv = netdev_priv(dev); - clk_disable_unprepare(priv->plat->clk_ptp_ref); + stmmac_release_ptp(priv); } /** @@ -2965,6 +2973,9 @@ static int stmmac_release(struct net_device *dev) /* Stop TX/RX DMA and clear the descriptors */ stmmac_stop_all_dma(priv); + /* Cleanup HW setup */ + stmmac_hw_teardown(dev); + /* Release and free the Rx/Tx resources */ free_dma_desc_resources(priv); @@ -2973,8 +2984,6 @@ static int stmmac_release(struct net_device *dev) netif_carrier_off(dev); - stmmac_release_ptp(priv); - return 0; } -- 2.29.2