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Message-Id: <1437005044-13433-1-git-send-email-clemens.gruber@pqgruber.com>
Date: Thu, 16 Jul 2015 02:04:04 +0200
From: Clemens Gruber <clemens.gruber@...ruber.com>
To: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Clemens Gruber <clemens.gruber@...ruber.com>,
Andrew Lunn <andrew@...n.ch>,
Fugang Duan <B38611@...escale.com>,
"David S. Miller" <davem@...emloft.net>
Subject: [PATCH] Revert "net: fec: Ensure clocks are enabled while using mdio bus"
This reverts commit 6c3e921b18edca290099adfddde8a50236bf2d80.
The change did break ethernet support on the i.MX6Q and possibly also on
other platforms: The PHY was not detected anymore and eth0 was not found.
Signed-off-by: Clemens Gruber <clemens.gruber@...ruber.com>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Fugang Duan <B38611@...escale.com>
Cc: David S. Miller <davem@...emloft.net>
---
drivers/net/ethernet/freescale/fec_main.c | 88 +++++--------------------------
1 file changed, 13 insertions(+), 75 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 42e20e5..1f89c59 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -24,7 +24,6 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
-#include <linux/pm_runtime.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
@@ -78,7 +77,6 @@ static void fec_enet_itr_coal_init(struct net_device *ndev);
#define FEC_ENET_RAEM_V 0x8
#define FEC_ENET_RAFL_V 0x8
#define FEC_ENET_OPD_V 0xFFF0
-#define FEC_MDIO_PM_TIMEOUT 100 /* ms */
static struct platform_device_id fec_devtype[] = {
{
@@ -1769,13 +1767,7 @@ static void fec_enet_adjust_link(struct net_device *ndev)
static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
{
struct fec_enet_private *fep = bus->priv;
- struct device *dev = &fep->pdev->dev;
unsigned long time_left;
- int ret = 0;
-
- ret = pm_runtime_get_sync(dev);
- if (IS_ERR_VALUE(ret))
- return ret;
fep->mii_timeout = 0;
init_completion(&fep->mdio_done);
@@ -1791,30 +1783,18 @@ static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
if (time_left == 0) {
fep->mii_timeout = 1;
netdev_err(fep->netdev, "MDIO read timeout\n");
- ret = -ETIMEDOUT;
- goto out;
+ return -ETIMEDOUT;
}
- ret = FEC_MMFR_DATA(readl(fep->hwp + FEC_MII_DATA));
-
-out:
- pm_runtime_mark_last_busy(dev);
- pm_runtime_put_autosuspend(dev);
-
- return ret;
+ /* return value */
+ return FEC_MMFR_DATA(readl(fep->hwp + FEC_MII_DATA));
}
static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
u16 value)
{
struct fec_enet_private *fep = bus->priv;
- struct device *dev = &fep->pdev->dev;
unsigned long time_left;
- int ret = 0;
-
- ret = pm_runtime_get_sync(dev);
- if (IS_ERR_VALUE(ret))
- return ret;
fep->mii_timeout = 0;
init_completion(&fep->mdio_done);
@@ -1831,13 +1811,10 @@ static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
if (time_left == 0) {
fep->mii_timeout = 1;
netdev_err(fep->netdev, "MDIO write timeout\n");
- ret = -ETIMEDOUT;
+ return -ETIMEDOUT;
}
- pm_runtime_mark_last_busy(dev);
- pm_runtime_put_autosuspend(dev);
-
- return ret;
+ return 0;
}
static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
@@ -1849,6 +1826,9 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
ret = clk_prepare_enable(fep->clk_ahb);
if (ret)
return ret;
+ ret = clk_prepare_enable(fep->clk_ipg);
+ if (ret)
+ goto failed_clk_ipg;
if (fep->clk_enet_out) {
ret = clk_prepare_enable(fep->clk_enet_out);
if (ret)
@@ -1872,6 +1852,7 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
}
} else {
clk_disable_unprepare(fep->clk_ahb);
+ clk_disable_unprepare(fep->clk_ipg);
if (fep->clk_enet_out)
clk_disable_unprepare(fep->clk_enet_out);
if (fep->clk_ptp) {
@@ -1893,6 +1874,8 @@ failed_clk_ptp:
if (fep->clk_enet_out)
clk_disable_unprepare(fep->clk_enet_out);
failed_clk_enet_out:
+ clk_disable_unprepare(fep->clk_ipg);
+failed_clk_ipg:
clk_disable_unprepare(fep->clk_ahb);
return ret;
@@ -2864,14 +2847,10 @@ fec_enet_open(struct net_device *ndev)
struct fec_enet_private *fep = netdev_priv(ndev);
int ret;
- ret = pm_runtime_get_sync(&fep->pdev->dev);
- if (IS_ERR_VALUE(ret))
- return ret;
-
pinctrl_pm_select_default_state(&fep->pdev->dev);
ret = fec_enet_clk_enable(ndev, true);
if (ret)
- goto clk_enable;
+ return ret;
/* I should reset the ring buffers here, but I don't yet know
* a simple way to do that.
@@ -2902,9 +2881,6 @@ err_enet_mii_probe:
fec_enet_free_buffers(ndev);
err_enet_alloc:
fec_enet_clk_enable(ndev, false);
-clk_enable:
- pm_runtime_mark_last_busy(&fep->pdev->dev);
- pm_runtime_put_autosuspend(&fep->pdev->dev);
pinctrl_pm_select_sleep_state(&fep->pdev->dev);
return ret;
}
@@ -2927,9 +2903,6 @@ fec_enet_close(struct net_device *ndev)
fec_enet_clk_enable(ndev, false);
pinctrl_pm_select_sleep_state(&fep->pdev->dev);
- pm_runtime_mark_last_busy(&fep->pdev->dev);
- pm_runtime_put_autosuspend(&fep->pdev->dev);
-
fec_enet_free_buffers(ndev);
return 0;
@@ -3415,10 +3388,6 @@ fec_probe(struct platform_device *pdev)
if (ret)
goto failed_clk;
- ret = clk_prepare_enable(fep->clk_ipg);
- if (ret)
- goto failed_clk_ipg;
-
fep->reg_phy = devm_regulator_get(&pdev->dev, "phy");
if (!IS_ERR(fep->reg_phy)) {
ret = regulator_enable(fep->reg_phy);
@@ -3465,8 +3434,6 @@ fec_probe(struct platform_device *pdev)
netif_carrier_off(ndev);
fec_enet_clk_enable(ndev, false);
pinctrl_pm_select_sleep_state(&pdev->dev);
- pm_runtime_set_active(&pdev->dev);
- pm_runtime_enable(&pdev->dev);
ret = register_netdev(ndev);
if (ret)
@@ -3480,12 +3447,6 @@ fec_probe(struct platform_device *pdev)
fep->rx_copybreak = COPYBREAK_DEFAULT;
INIT_WORK(&fep->tx_timeout_work, fec_enet_timeout_work);
-
- pm_runtime_set_autosuspend_delay(&pdev->dev, FEC_MDIO_PM_TIMEOUT);
- pm_runtime_use_autosuspend(&pdev->dev);
- pm_runtime_mark_last_busy(&pdev->dev);
- pm_runtime_put_autosuspend(&pdev->dev);
-
return 0;
failed_register:
@@ -3496,8 +3457,6 @@ failed_init:
if (fep->reg_phy)
regulator_disable(fep->reg_phy);
failed_regulator:
- clk_disable_unprepare(fep->clk_ipg);
-failed_clk_ipg:
fec_enet_clk_enable(ndev, false);
failed_clk:
failed_phy:
@@ -3609,28 +3568,7 @@ failed_clk:
return ret;
}
-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_ipg);
-
- return 0;
-}
-
-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);
-
- return clk_prepare_enable(fep->clk_ipg);
-}
-
-static const struct dev_pm_ops fec_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(fec_suspend, fec_resume)
- SET_RUNTIME_PM_OPS(fec_runtime_suspend, fec_runtime_resume, NULL)
-};
+static SIMPLE_DEV_PM_OPS(fec_pm_ops, fec_suspend, fec_resume);
static struct platform_driver fec_driver = {
.driver = {
--
2.4.5
--
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