[PATCH 5.10 020/103] net: stmmac: dwmac-sun8i: Balance syscon (de)initialization

Greg Kroah-Hartman
2021-01-15T12:48:16Z

From: Samuel Holland <samuel@sholland.org>

[ Upstream commit 9b1e39cf5dd81f33186cdb950fcf75a121f1a9a7 ]

Previously, sun8i_dwmac_set_syscon was called from a chain of functions
in several different files:
sun8i_dwmac_probe
stmmac_dvr_probe
stmmac_hw_init
stmmac_hwif_init
sun8i_dwmac_setup
sun8i_dwmac_set_syscon
which made the lifetime of the syscon values hard to reason about. Part
of the problem is that there is no similar platform driver callback from
stmmac_dvr_remove. As a result, the driver unset the syscon value in
sun8i_dwmac_exit, but this leaves it uninitialized after a suspend/
resume cycle. It was also unset a second time (outside sun8i_dwmac_exit)
in the probe error path.

Move the init to the earliest available place in sun8i_dwmac_probe
(after stmmac_probe_config_dt, which initializes plat_dat), and the
deinit to the corresponding position in the cleanup order.

Since priv is not filled in until stmmac_dvr_probe, this requires
changing the sun8i_dwmac_set_syscon parameters to priv's two relevant
members.

Fixes: 9f93ac8d4085 ("net-next: stmmac: Add dwmac-sun8i")
Fixes: 634db83b8265 ("net: stmmac: dwmac-sun8i: Handle integrated/external MDIOs")
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 50 +++++++++++-----------
1 file changed, 25 insertions(+), 25 deletions(-)

--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
@@ -898,22 +898,23 @@ static int sun8i_dwmac_register_mdio_mux
return ret;
}

-static int sun8i_dwmac_set_syscon(struct stmmac_priv *priv)
+static int sun8i_dwmac_set_syscon(struct device *dev,
+ struct plat_stmmacenet_data *plat)
{
- struct sunxi_priv_data *gmac = priv->plat->bsp_priv;
- struct device_node *node = priv->device->of_node;
+ struct sunxi_priv_data *gmac = plat->bsp_priv;
+ struct device_node *node = dev->of_node;
int ret;
u32 reg, val;

ret = regmap_field_read(gmac->regmap_field, &val);
if (ret) {
- dev_err(priv->device, "Fail to read from regmap field.\n");
+ dev_err(dev, "Fail to read from regmap field.\n");
return ret;
}

reg = gmac->variant->default_syscon_value;
if (reg != val)
- dev_warn(priv->device,
+ dev_warn(dev,
"Current syscon value is not the default %x (expect %x)\n",
val, reg);

@@ -926,9 +927,9 @@ static int sun8i_dwmac_set_syscon(struct
/* Force EPHY xtal frequency to 24MHz. */
reg |= H3_EPHY_CLK_SEL;

- ret = of_mdio_parse_addr(priv->device, priv->plat->phy_node);
+ ret = of_mdio_parse_addr(dev, plat->phy_node);
if (ret < 0) {
- dev_err(priv->device, "Could not parse MDIO addr\n");
+ dev_err(dev, "Could not parse MDIO addr\n");
return ret;
}
/* of_mdio_parse_addr returns a valid (0 ~ 31) PHY
@@ -944,17 +945,17 @@ static int sun8i_dwmac_set_syscon(struct

if (!of_property_read_u32(node, "allwinner,tx-delay-ps", &val)) {
if (val % 100) {
- dev_err(priv->device, "tx-delay must be a multiple of 100\n");
+ dev_err(dev, "tx-delay must be a multiple of 100\n");
return -EINVAL;
}
val /= 100;
- dev_dbg(priv->device, "set tx-delay to %x\n", val);
+ dev_dbg(dev, "set tx-delay to %x\n", val);
if (val <= gmac->variant->tx_delay_max) {
reg &= ~(gmac->variant->tx_delay_max <<
SYSCON_ETXDC_SHIFT);
reg |= (val << SYSCON_ETXDC_SHIFT);
} else {
- dev_err(priv->device, "Invalid TX clock delay: %d\n",
+ dev_err(dev, "Invalid TX clock delay: %d\n",
val);
return -EINVAL;
}
@@ -962,17 +963,17 @@ static int sun8i_dwmac_set_syscon(struct

if (!of_property_read_u32(node, "allwinner,rx-delay-ps", &val)) {
if (val % 100) {
- dev_err(priv->device, "rx-delay must be a multiple of 100\n");
+ dev_err(dev, "rx-delay must be a multiple of 100\n");
return -EINVAL;
}
val /= 100;
- dev_dbg(priv->device, "set rx-delay to %x\n", val);
+ dev_dbg(dev, "set rx-delay to %x\n", val);
if (val <= gmac->variant->rx_delay_max) {
reg &= ~(gmac->variant->rx_delay_max <<
SYSCON_ERXDC_SHIFT);
reg |= (val << SYSCON_ERXDC_SHIFT);
} else {
- dev_err(priv->device, "Invalid RX clock delay: %d\n",
+ dev_err(dev, "Invalid RX clock delay: %d\n",
val);
return -EINVAL;
}
@@ -983,7 +984,7 @@ static int sun8i_dwmac_set_syscon(struct
if (gmac->variant->support_rmii)
reg &= ~SYSCON_RMII_EN;

- switch (priv->plat->interface) {
+ switch (plat->interface) {
case PHY_INTERFACE_MODE_MII:
/* default */
break;
@@ -997,8 +998,8 @@ static int sun8i_dwmac_set_syscon(struct
reg |= SYSCON_RMII_EN | SYSCON_ETCS_EXT_GMII;
break;
default:
- dev_err(priv->device, "Unsupported interface mode: %s",
- phy_modes(priv->plat->interface));
+ dev_err(dev, "Unsupported interface mode: %s",
+ phy_modes(plat->interface));
return -EINVAL;
}

@@ -1023,8 +1024,6 @@ static void sun8i_dwmac_exit(struct plat
sun8i_dwmac_unpower_internal_phy(gmac);
}

- sun8i_dwmac_unset_syscon(gmac);
-
clk_disable_unprepare(gmac->tx_clk);

if (gmac->regulator)
@@ -1059,16 +1058,11 @@ static struct mac_device_info *sun8i_dwm
{
struct mac_device_info *mac;
struct stmmac_priv *priv = ppriv;
- int ret;

mac = devm_kzalloc(priv->device, sizeof(*mac), GFP_KERNEL);
if (!mac)
return NULL;

- ret = sun8i_dwmac_set_syscon(priv);
- if (ret)
- return NULL;
-
mac->pcsr = priv->ioaddr;
mac->mac = &sun8i_dwmac_ops;
mac->dma = &sun8i_dwmac_dma_ops;
@@ -1224,10 +1218,14 @@ static int sun8i_dwmac_probe(struct plat
plat_dat->exit = sun8i_dwmac_exit;
plat_dat->setup = sun8i_dwmac_setup;

- ret = sun8i_dwmac_init(pdev, plat_dat->bsp_priv);
+ ret = sun8i_dwmac_set_syscon(&pdev->dev, plat_dat);
if (ret)
goto dwmac_deconfig;

+ ret = sun8i_dwmac_init(pdev, plat_dat->bsp_priv);
+ if (ret)
+ goto dwmac_syscon;
+
ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
if (ret)
goto dwmac_exit;
@@ -1256,11 +1254,12 @@ static int sun8i_dwmac_probe(struct plat
dwmac_mux:
reset_control_put(gmac->rst_ephy);
clk_put(gmac->ephy_clk);
- sun8i_dwmac_unset_syscon(gmac);
dwmac_remove:
stmmac_dvr_remove(&pdev->dev);
dwmac_exit:
sun8i_dwmac_exit(pdev, gmac);
+dwmac_syscon:
+ sun8i_dwmac_unset_syscon(gmac);
dwmac_deconfig:
stmmac_remove_config_dt(pdev, plat_dat);

@@ -1281,6 +1280,7 @@ static int sun8i_dwmac_remove(struct pla
}

stmmac_pltfr_remove(pdev);
+ sun8i_dwmac_unset_syscon(gmac);

return 0;
}