Add CLKOUT disable support for RTL8211F(D)(I)-VD-CG. Like with other PHY variants, this feature might be requested by customers when the clock output is not used, in order to reduce electromagnetic interference (EMI). In the common driver, the CLKOUT configuration is done through PHYCR2. The RTL_8211FVD_PHYID is singled out as not having that register, and execution in rtl8211f_config_init() returns early after commit 2c67301584f2 ("net: phy: realtek: Avoid PHYCR2 access if PHYCR2 not present"). But actually CLKOUT is configured through a different register for this PHY. Instead of pretending this is PHYCR2 (which it is not), just add some code for modifying this register inside the rtl8211f_disable_clk_out() function, and move that outside the code portion that runs only if PHYCR2 exists. In practice this reorders the PHYCR2 writes to disable PHY-mode EEE and to disable the CLKOUT for the normal RTL8211F variants, but this should be perfectly fine. It was not noted that RTL8211F(D)(I)-VD-CG would need a genphy_soft_reset() call after disabling the CLKOUT. Co-developed-by: Clark Wang Signed-off-by: Clark Wang Signed-off-by: Vladimir Oltean --- drivers/net/phy/realtek/realtek_main.c | 27 +++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/drivers/net/phy/realtek/realtek_main.c b/drivers/net/phy/realtek/realtek_main.c index 89cc54a7f270..c7e54460b58d 100644 --- a/drivers/net/phy/realtek/realtek_main.c +++ b/drivers/net/phy/realtek/realtek_main.c @@ -90,6 +90,14 @@ #define RTL8211F_LEDCR_MASK GENMASK(4, 0) #define RTL8211F_LEDCR_SHIFT 5 +/* RTL8211F(D)(I)-VD-CG CLKOUT configuration is specified via magic values + * to undocumented register pages. The names here do not reflect the datasheet. + * Unlike other PHY models, CLKOUT configuration does not go through PHYCR2. + */ +#define RTL8211FVD_CLKOUT_PAGE 0xd05 +#define RTL8211FVD_CLKOUT_REG 0x11 +#define RTL8211FVD_CLKOUT_EN BIT(8) + /* RTL8211F RGMII configuration */ #define RTL8211F_RGMII_PAGE 0xd08 @@ -585,6 +593,11 @@ static int rtl8211f_disable_clk_out(struct phy_device *phydev) if (!priv->disable_clk_out) return 0; + if (phydev->drv->phy_id == RTL_8211FVD_PHYID) + return phy_modify_paged(phydev, RTL8211FVD_CLKOUT_PAGE, + RTL8211FVD_CLKOUT_REG, + RTL8211FVD_CLKOUT_EN, 0); + return phy_modify_paged(phydev, RTL8211F_PHYCR_PAGE, RTL8211F_PHYCR2, RTL8211F_CLKOUT_EN, 0); } @@ -662,6 +675,13 @@ static int rtl8211f_config_init(struct phy_device *phydev) str_enabled_disabled(val_rxdly)); } + ret = rtl8211f_disable_clk_out(phydev); + if (ret) { + dev_err(dev, "clkout configuration failed: %pe\n", + ERR_PTR(ret)); + return ret; + } + /* RTL8211FVD has no PHYCR2 register */ if (phydev->drv->phy_id == RTL_8211FVD_PHYID) return 0; @@ -672,13 +692,6 @@ static int rtl8211f_config_init(struct phy_device *phydev) if (ret) return ret; - ret = rtl8211f_disable_clk_out(phydev); - if (ret) { - dev_err(dev, "clkout configuration failed: %pe\n", - ERR_PTR(ret)); - return ret; - } - return genphy_soft_reset(phydev); } -- 2.34.1