[PATCH 2/3] net: stmmac: dwmac-rk: keep the PHY up for WoL

[Vincent Palatin]

When suspending the machine, do not shutdown the external PHY by cutting
its regulator in the mac platform driver suspend code if Wake-on-Lan is enabled,
else it cannot wake us up.
In order to do this, split the suspend/resume callbacks from the
init/exit callbacks, so we can condition the power-down on the lack of
need to wake-up from the LAN but do it unconditionally when unloading the
module.

Signed-off-by: Vincent Palatin <vpala...@chromium.org>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c | 49 +++++++++++++++++++++++---
 1 file changed, 44 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c 
b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index 0cd3ecf..fa05771 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -46,6 +46,7 @@ struct rk_priv_data {
        struct platform_device *pdev;
        int phy_iface;
        struct regulator *regulator;
+       bool powered_down;
        const struct rk_gmac_ops *ops;
 
        bool clk_enabled;
@@ -529,9 +530,8 @@ static struct rk_priv_data *rk_gmac_setup(struct 
platform_device *pdev,
        return bsp_priv;
 }
 
-static int rk_gmac_init(struct platform_device *pdev, void *priv)
+static int rk_gmac_powerup(struct rk_priv_data *bsp_priv)
 {
-       struct rk_priv_data *bsp_priv = priv;
        int ret;
 
        ret = phy_power_on(bsp_priv, true);
@@ -542,15 +542,52 @@ static int rk_gmac_init(struct platform_device *pdev, 
void *priv)
        if (ret)
                return ret;
 
+       bsp_priv->powered_down = true;
+
        return 0;
 }
 
-static void rk_gmac_exit(struct platform_device *pdev, void *priv)
+static void rk_gmac_powerdown(struct rk_priv_data *gmac)
 {
-       struct rk_priv_data *gmac = priv;
-
        phy_power_on(gmac, false);
        gmac_clk_enable(gmac, false);
+       gmac->powered_down = true;
+}
+
+static int rk_gmac_init(struct platform_device *pdev, void *priv)
+{
+       struct rk_priv_data *bsp_priv = priv;
+
+       return rk_gmac_powerup(bsp_priv);
+}
+
+static void rk_gmac_exit(struct platform_device *pdev, void *priv)
+{
+       struct rk_priv_data *bsp_priv = priv;
+
+       rk_gmac_powerdown(bsp_priv);
+}
+
+static void rk_gmac_suspend(struct platform_device *pdev, void *priv)
+{
+       struct rk_priv_data *bsp_priv = priv;
+
+       /* Keep the PHY up if we use Wake-on-Lan. */
+       if (device_may_wakeup(&pdev->dev))
+               return;
+
+       rk_gmac_powerdown(bsp_priv);
+}
+
+static void rk_gmac_resume(struct platform_device *pdev, void *priv)
+{
+       struct rk_priv_data *bsp_priv = priv;
+
+       /* The PHY was up for Wake-on-Lan. */
+       if (!bsp_priv->powered_down)
+               return;
+
+       rk_gmac_powerup(bsp_priv);
 }
 
 static void rk_fix_speed(void *priv, unsigned int speed)
@@ -591,6 +628,8 @@ static int rk_gmac_probe(struct platform_device *pdev)
        plat_dat->init = rk_gmac_init;
        plat_dat->exit = rk_gmac_exit;
        plat_dat->fix_mac_speed = rk_fix_speed;
+       plat_dat->suspend = rk_gmac_suspend;
+       plat_dat->resume = rk_gmac_resume;
 
        plat_dat->bsp_priv = rk_gmac_setup(pdev, data);
        if (IS_ERR(plat_dat->bsp_priv))
-- 
2.8.0.rc3.226.g39d4020