@@ -16,6 +16,7 @@
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/regmap.h>
#include <linux/stmmac.h>
@@ -57,7 +58,6 @@ struct emac_variant {
};
/* struct sunxi_priv_data - hold all sunxi private data
- * @tx_clk: reference to MAC TX clock
* @ephy_clk: reference to the optional EPHY clock for the internal PHY
* @regulator: reference to the optional regulator
* @rst_ephy: reference to the optional EPHY reset for the internal PHY
@@ -68,7 +68,6 @@ struct emac_variant {
* @mux_handle: Internal pointer used by mdio-mux lib
*/
struct sunxi_priv_data {
- struct clk *tx_clk;
struct clk *ephy_clk;
struct regulator *regulator;
struct reset_control *rst_ephy;
@@ -579,22 +578,14 @@ static int sun8i_dwmac_init(struct platform_device *pdev, void *priv)
}
}
- ret = clk_prepare_enable(gmac->tx_clk);
- if (ret) {
- dev_err(&pdev->dev, "Could not enable AHB clock\n");
- goto err_disable_regulator;
- }
-
if (gmac->use_internal_phy) {
ret = sun8i_dwmac_power_internal_phy(netdev_priv(ndev));
if (ret)
- goto err_disable_clk;
+ goto err_disable_regulator;
}
return 0;
-err_disable_clk:
- clk_disable_unprepare(gmac->tx_clk);
err_disable_regulator:
if (gmac->regulator)
regulator_disable(gmac->regulator);
@@ -1043,8 +1034,6 @@ static void sun8i_dwmac_exit(struct platform_device *pdev, void *priv)
if (gmac->variant->soc_has_internal_phy)
sun8i_dwmac_unpower_internal_phy(gmac);
- clk_disable_unprepare(gmac->tx_clk);
-
if (gmac->regulator)
regulator_disable(gmac->regulator);
}
@@ -1167,12 +1156,6 @@ static int sun8i_dwmac_probe(struct platform_device *pdev)
return -EINVAL;
}
- gmac->tx_clk = devm_clk_get(dev, "stmmaceth");
- if (IS_ERR(gmac->tx_clk)) {
- dev_err(dev, "Could not get TX clock\n");
- return PTR_ERR(gmac->tx_clk);
- }
-
/* Optional regulator for PHY */
gmac->regulator = devm_regulator_get_optional(dev, "phy");
if (IS_ERR(gmac->regulator)) {
@@ -1254,6 +1237,12 @@ static int sun8i_dwmac_probe(struct platform_device *pdev)
ndev = dev_get_drvdata(&pdev->dev);
priv = netdev_priv(ndev);
+ /* the MAC is runtime suspended after stmmac_dvr_probe(), so we
+ * need to ensure the MAC resume back before other operations such
+ * as reset.
+ */
+ pm_runtime_get_sync(&pdev->dev);
+
/* The mux must be registered after parent MDIO
* so after stmmac_dvr_probe()
*/
@@ -1272,12 +1261,15 @@ static int sun8i_dwmac_probe(struct platform_device *pdev)
goto dwmac_remove;
}
+ pm_runtime_put(&pdev->dev);
+
return 0;
dwmac_mux:
reset_control_put(gmac->rst_ephy);
clk_put(gmac->ephy_clk);
dwmac_remove:
+ pm_runtime_put_noidle(&pdev->dev);
stmmac_dvr_remove(&pdev->dev);
dwmac_exit:
sun8i_dwmac_exit(pdev, gmac);
Currently, the dwmac-sun8i's stmmaceth clk isn't disabled even if the the device has been runtime suspended. The reason is the driver gets the "stmmaceth" clk as tx_clk and enabling it during probe. But there's no other usage of tx_clk except preparing and enabling, so we can remove tx_clk and its usage then rely on the common routine stmmac_probe_config_dt() to prepare and enable the stmmaceth clk during driver initialization, and benefit from the runtime pm feature after probed. Signed-off-by: Jisheng Zhang <jszhang@kernel.org> --- .../net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 30 +++++++------------ 1 file changed, 11 insertions(+), 19 deletions(-)