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net: systemport: fetch and use clock resources

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We disable clocks shortly after probing the device to save as much power as
possible in case the interface is never used. When bcm_sysport_open() is
invoked, clocks are enabled, and disabled in bcm_sysport_stop().

A similar scheme is applied to the suspend/resume functions.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2020-09-01 14:43:47 -07:00 committed by David S. Miller
parent af89606924
commit 31bc72d976
2 changed files with 30 additions and 1 deletions
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30
drivers/net/ethernet/broadcom/bcmsysport.c
View File

@ -20,6 +20,7 @@
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <net/dsa.h>
#include <linux/clk.h>
#include <net/ip.h>
#include <net/ipv6.h>
@ -186,6 +187,11 @@ static int bcm_sysport_set_features(struct net_device *dev,
netdev_features_t features)
{
struct bcm_sysport_priv *priv = netdev_priv(dev);
int ret;
ret = clk_prepare_enable(priv->clk);
if (ret)
return ret;
/* Read CRC forward */
if (!priv->is_lite)
@ -197,6 +203,8 @@ static int bcm_sysport_set_features(struct net_device *dev,
bcm_sysport_set_rx_csum(dev, features);
bcm_sysport_set_tx_csum(dev, features);
clk_disable_unprepare(priv->clk);
return 0;
}
@ -1940,6 +1948,8 @@ static int bcm_sysport_open(struct net_device *dev)
unsigned int i;
int ret;
clk_prepare_enable(priv->clk);
/* Reset UniMAC */
umac_reset(priv);
@ -1970,7 +1980,8 @@ static int bcm_sysport_open(struct net_device *dev)
0, priv->phy_interface);
if (!phydev) {
netdev_err(dev, "could not attach to PHY\n");
return -ENODEV;
ret = -ENODEV;
goto out_clk_disable;
}
/* Reset house keeping link status */
@ -2048,6 +2059,8 @@ static int bcm_sysport_open(struct net_device *dev)
free_irq(priv->irq0, dev);
out_phy_disconnect:
phy_disconnect(phydev);
out_clk_disable:
clk_disable_unprepare(priv->clk);
return ret;
}
@ -2106,6 +2119,8 @@ static int bcm_sysport_stop(struct net_device *dev)
/* Disconnect from PHY */
phy_disconnect(dev->phydev);
clk_disable_unprepare(priv->clk);
return 0;
}
@ -2487,6 +2502,10 @@ static int bcm_sysport_probe(struct platform_device *pdev)
/* Initialize private members */
priv = netdev_priv(dev);
priv->clk = devm_clk_get_optional(&pdev->dev, "sw_sysport");
if (IS_ERR(priv->clk))
return PTR_ERR(priv->clk);
/* Allocate number of TX rings */
priv->tx_rings = devm_kcalloc(&pdev->dev, txq,
sizeof(struct bcm_sysport_tx_ring),
@ -2588,6 +2607,8 @@ static int bcm_sysport_probe(struct platform_device *pdev)
goto err_deregister_notifier;
}
clk_prepare_enable(priv->clk);
priv->rev = topctrl_readl(priv, REV_CNTL) & REV_MASK;
dev_info(&pdev->dev,
"Broadcom SYSTEMPORT%s " REV_FMT
@ -2596,6 +2617,8 @@ static int bcm_sysport_probe(struct platform_device *pdev)
(priv->rev >> 8) & 0xff, priv->rev & 0xff,
priv->irq0, priv->irq1, txq, rxq);
clk_disable_unprepare(priv->clk);
return 0;
err_deregister_notifier:
@ -2752,6 +2775,8 @@ static int __maybe_unused bcm_sysport_suspend(struct device *d)
if (device_may_wakeup(d) && priv->wolopts)
ret = bcm_sysport_suspend_to_wol(priv);
clk_disable_unprepare(priv->clk);
return ret;
}
@ -2765,6 +2790,8 @@ static int __maybe_unused bcm_sysport_resume(struct device *d)
if (!netif_running(dev))
return 0;
clk_prepare_enable(priv->clk);
umac_reset(priv);
/* Disable the UniMAC RX/TX */
@ -2844,6 +2871,7 @@ static int __maybe_unused bcm_sysport_resume(struct device *d)
out_free_tx_rings:
for (i = 0; i < dev->num_tx_queues; i++)
bcm_sysport_fini_tx_ring(priv, i);
clk_disable_unprepare(priv->clk);
return ret;
}

1
drivers/net/ethernet/broadcom/bcmsysport.h
View File

@ -770,6 +770,7 @@ struct bcm_sysport_priv {
u32 wolopts;
u8 sopass[SOPASS_MAX];
unsigned int wol_irq_disabled:1;
struct clk *clk;
/* MIB related fields */
struct bcm_sysport_mib mib;