Thread (26 messages) flat view 26 messages, 5 authors, 2016-06-17

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

From: Heiko Stuebner <heiko@sntech.de>
Date: 2016-06-11 01:57:51
Also in: lkml

Am Freitag, 10. Juni 2016, 18:00:38 schrieb Vincent Palatin:
quoted hunk ↗ jump to hunk
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 <redacted>
---
 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;
naming it gmac->suspended and doing all accesses in the suspend/resume 
callback might provide a nicer way? Now the check is in resume while the 
powerdown callback is setting it.
+}
+
+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);
aka do
	bsp_priv->suspended = true;
here
+}
+
+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);
missing something like
	bsp_priv->suspended = false;

Right now it looks like your bsp_priv->powered_down will always be true 
after the first suspend with powerdown.
quoted hunk ↗ jump to hunk
 }

 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
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