Message ID | 1601018715-952-1-git-send-email-willy.liu@realtek.com |
---|---|
State | Changes Requested |
Delegated to: | David Miller |
Headers | show |
Series | [net] net: phy: realtek: fix rtl8211e rx/tx delay config | expand |
On Fri, Sep 25, 2020 at 03:25:15PM +0800, Willy Liu wrote: > There are two chip pins named TXDLY and RXDLY which actually adds the 2ns > delays to TXC and RXC for TXD/RXD latching. These two pins can config via > 4.7k-ohm resistor to 3.3V hw setting, but also config via software setting > (extension page 0xa4 register 0x1c bit13 12 and 11). > > The configuration register definitions from table 13 official PHY datasheet: > PHYAD[2:0] = PHY Address > AN[1:0] = Auto-Negotiation > Mode = Interface Mode Select > RX Delay = RX Delay > TX Delay = TX Delay > SELRGV = RGMII/GMII Selection > > This table describes how to config these hw pins via external pull-high or pull- > low resistor. > > It is a misunderstanding that mapping it as register bits below: > 8:6 = PHY Address > 5:4 = Auto-Negotiation > 3 = Interface Mode Select > 2 = RX Delay > 1 = TX Delay > 0 = SELRGV > So I removed these descriptions above and add related settings as below: > 14 = reserved > 13 = force Tx RX Delay controlled by bit12 bit11 > 12 = Tx Delay > 11 = Rx Delay > 10:0 = Test && debug settings reserved by realtek Hi Willy Thanks for adding a full description of what the bits do. Please in future add a version number to the subject line. [PATCH net v3] ..... So we know which is the latest version. I think the fix is actually wrong. /* enable TX/RX delay for rgmii-* modes, and disable them for rgmii. */ switch (phydev->interface) { case PHY_INTERFACE_MODE_RGMII: val = 0; break; case PHY_INTERFACE_MODE_RGMII_ID: val = RTL8211E_TX_DELAY | RTL8211E_RX_DELAY; break; case PHY_INTERFACE_MODE_RGMII_RXID: val = RTL8211E_RX_DELAY; break; case PHY_INTERFACE_MODE_RGMII_TXID: val = RTL8211E_TX_DELAY; break; default: /* the rest of the modes imply leaving delays as is. */ return 0; } If the user requests RGMII, we really should set it to RGMII, not leave the strapping configuration enabled. That means we need to turn on the force bit, and the two delays off. Please also change the case PHY_INTERFACE_MODE_RGMII. Thanks Andrew
On Fri, 25 Sep 2020 15:25:15 +0800 Willy Liu wrote: > There are two chip pins named TXDLY and RXDLY which actually adds the 2ns > delays to TXC and RXC for TXD/RXD latching. These two pins can config via > 4.7k-ohm resistor to 3.3V hw setting, but also config via software setting > (extension page 0xa4 register 0x1c bit13 12 and 11). > > The configuration register definitions from table 13 official PHY datasheet: > PHYAD[2:0] = PHY Address > AN[1:0] = Auto-Negotiation > Mode = Interface Mode Select > RX Delay = RX Delay > TX Delay = TX Delay > SELRGV = RGMII/GMII Selection Checkpatch says: ERROR: do not set execute permissions for source files #48: FILE: drivers/net/phy/realtek.c ERROR: trailing whitespace #91: FILE: drivers/net/phy/realtek.c:266: +^I * the RX/TX delays otherwise controlled by RXDLY/TXDLY pins. $ total: 2 errors, 0 warnings, 0 checks, 54 lines checked
diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c old mode 100644 new mode 100755 index 95dbe5e..f5fce80 --- a/drivers/net/phy/realtek.c +++ b/drivers/net/phy/realtek.c @@ -32,9 +32,9 @@ #define RTL8211F_TX_DELAY BIT(8) #define RTL8211F_RX_DELAY BIT(3) -#define RTL8211E_TX_DELAY BIT(1) -#define RTL8211E_RX_DELAY BIT(2) -#define RTL8211E_MODE_MII_GMII BIT(3) +#define RTL8211E_CTRL_DELAY BIT(13) +#define RTL8211E_TX_DELAY BIT(12) +#define RTL8211E_RX_DELAY BIT(11) #define RTL8201F_ISR 0x1e #define RTL8201F_IER 0x13 @@ -249,13 +249,13 @@ static int rtl8211e_config_init(struct phy_device *phydev) val = 0; break; case PHY_INTERFACE_MODE_RGMII_ID: - val = RTL8211E_TX_DELAY | RTL8211E_RX_DELAY; + val = RTL8211E_CTRL_DELAY | RTL8211E_TX_DELAY | RTL8211E_RX_DELAY; break; case PHY_INTERFACE_MODE_RGMII_RXID: - val = RTL8211E_RX_DELAY; + val = RTL8211E_CTRL_DELAY | RTL8211E_RX_DELAY; break; case PHY_INTERFACE_MODE_RGMII_TXID: - val = RTL8211E_TX_DELAY; + val = RTL8211E_CTRL_DELAY | RTL8211E_TX_DELAY; break; default: /* the rest of the modes imply leaving delays as is. */ return 0; @@ -263,11 +263,12 @@ static int rtl8211e_config_init(struct phy_device *phydev) /* According to a sample driver there is a 0x1c config register on the * 0xa4 extension page (0x7) layout. It can be used to disable/enable - * the RX/TX delays otherwise controlled by RXDLY/TXDLY pins. It can - * also be used to customize the whole configuration register: - * 8:6 = PHY Address, 5:4 = Auto-Negotiation, 3 = Interface Mode Select, - * 2 = RX Delay, 1 = TX Delay, 0 = SELRGV (see original PHY datasheet - * for details). + * the RX/TX delays otherwise controlled by RXDLY/TXDLY pins. + * The configuration register definition: + * 14 = reserved + * 13 = Force Tx RX Delay controlled by bit12 bit11, + * 12 = RX Delay, 11 = TX Delay + * 10:0 = Test && debug settings reserved by realtek */ oldpage = phy_select_page(phydev, 0x7); if (oldpage < 0) @@ -277,7 +278,8 @@ static int rtl8211e_config_init(struct phy_device *phydev) if (ret) goto err_restore_page; - ret = __phy_modify(phydev, 0x1c, RTL8211E_TX_DELAY | RTL8211E_RX_DELAY, + ret = __phy_modify(phydev, 0x1c, RTL8211E_CTRL_DELAY + | RTL8211E_TX_DELAY | RTL8211E_RX_DELAY, val); err_restore_page:
There are two chip pins named TXDLY and RXDLY which actually adds the 2ns delays to TXC and RXC for TXD/RXD latching. These two pins can config via 4.7k-ohm resistor to 3.3V hw setting, but also config via software setting (extension page 0xa4 register 0x1c bit13 12 and 11). The configuration register definitions from table 13 official PHY datasheet: PHYAD[2:0] = PHY Address AN[1:0] = Auto-Negotiation Mode = Interface Mode Select RX Delay = RX Delay TX Delay = TX Delay SELRGV = RGMII/GMII Selection This table describes how to config these hw pins via external pull-high or pull- low resistor. It is a misunderstanding that mapping it as register bits below: 8:6 = PHY Address 5:4 = Auto-Negotiation 3 = Interface Mode Select 2 = RX Delay 1 = TX Delay 0 = SELRGV So I removed these descriptions above and add related settings as below: 14 = reserved 13 = force Tx RX Delay controlled by bit12 bit11 12 = Tx Delay 11 = Rx Delay 10:0 = Test && debug settings reserved by realtek Test && debug settings are not recommend to modify by default. Fixes: f81dadbcf7fd ("net: phy: realtek: Add rtl8211e rx/tx delays config") Signed-off-by: Willy Liu <willy.liu@realtek.com> --- drivers/net/phy/realtek.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) mode change 100644 => 100755 drivers/net/phy/realtek.c