* [RFC net-next v3 1/3] net: dsa: microchip: ksz8: move BMCR specific code to separate function
2024-01-12 14:07 [RFC net-next v3 0/3] net: dsa: microchip: implement PHY loopback Oleksij Rempel
@ 2024-01-12 14:07 ` Oleksij Rempel
2024-01-12 14:07 ` [RFC net-next v3 2/3] net: dsa: microchip: Remove redundant optimization in ksz8_w_phy_bmcr Oleksij Rempel
2024-01-12 14:07 ` [RFC net-next v3 3/3] net: dsa: microchip: implement PHY loopback configuration for KSZ8794 and KSZ8873 Oleksij Rempel
2 siblings, 0 replies; 6+ messages in thread
From: Oleksij Rempel @ 2024-01-12 14:07 UTC (permalink / raw)
To: David S. Miller, Andrew Lunn, Eric Dumazet, Florian Fainelli,
Jakub Kicinski, Paolo Abeni, Vladimir Oltean, Woojung Huh,
Arun Ramadoss
Cc: Oleksij Rempel, Vladimir Oltean, kernel, linux-kernel, netdev,
UNGLinuxDriver
Isolate the Basic Mode Control Register (BMCR) operations in the ksz8795
driver by moving the BMCR-related code segments from the ksz8_r_phy()
and ksz8_w_phy() functions to newly created ksz8_r_phy_bmcr() and
ksz8_w_phy_bmcr() functions.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>
---
drivers/net/dsa/microchip/ksz8795.c | 366 ++++++++++++++++++----------
1 file changed, 240 insertions(+), 126 deletions(-)
diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 61b71bcfe396..1269dde832bd 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -676,59 +676,118 @@ static int ksz8_r_phy_ctrl(struct ksz_device *dev, int port, u16 *val)
return 0;
}
+/**
+ * ksz8_r_phy_bmcr - Translates and reads from the SMI interface to a MIIM PHY
+ * Basic mode control register (Reg. 0).
+ * @dev: The KSZ device instance.
+ * @port: The port number to be read.
+ * @val: The value read from the SMI interface.
+ *
+ * This function reads the SMI interface and translates the hardware register
+ * bit values into their corresponding control settings for a MIIM PHY Basic
+ * mode control register.
+ *
+ * MIIM Bit Mapping Comparison between KSZ8794 and KSZ8873
+ * -------------------------------------------------------------------
+ * MIIM Bit | KSZ8794 Reg/Bit | KSZ8873 Reg/Bit
+ * ----------------------------+-----------------------------+----------------
+ * Bit 15 - Soft Reset | 0xF/4 | Not supported
+ * Bit 14 - Loopback | 0xD/0 (MAC), 0xF/7 (PHY) ~ 0xD/0 (PHY)
+ * Bit 13 - Force 100 | 0xC/6 = 0xC/6
+ * Bit 12 - AN Enable | 0xC/7 (reverse logic) ~ 0xC/7
+ * Bit 11 - Power Down | 0xD/3 = 0xD/3
+ * Bit 10 - PHY Isolate | 0xF/5 | Not supported
+ * Bit 9 - Restart AN | 0xD/5 = 0xD/5
+ * Bit 8 - Force Full-Duplex | 0xC/5 = 0xC/5
+ * Bit 7 - Collision Test/Res. | Not supported | Not supported
+ * Bit 6 - Reserved | Not supported | Not supported
+ * Bit 5 - Hp_mdix | 0x9/7 ~ 0xF/7
+ * Bit 4 - Force MDI | 0xD/1 = 0xD/1
+ * Bit 3 - Disable MDIX | 0xD/2 = 0xD/2
+ * Bit 2 - Disable Far-End F. | ???? | 0xD/4
+ * Bit 1 - Disable Transmit | 0xD/6 = 0xD/6
+ * Bit 0 - Disable LED | 0xD/7 = 0xD/7
+ * -------------------------------------------------------------------
+ *
+ * Return: 0 on success, error code on failure.
+ */
+static int ksz8_r_phy_bmcr(struct ksz_device *dev, u16 port, u16 *val)
+{
+ const u16 *regs = dev->info->regs;
+ u8 restart, speed, ctrl;
+ int ret;
+
+ *val = 0;
+
+ ret = ksz_pread8(dev, port, regs[P_NEG_RESTART_CTRL], &restart);
+ if (ret)
+ return ret;
+
+ ret = ksz_pread8(dev, port, regs[P_SPEED_STATUS], &speed);
+ if (ret)
+ return ret;
+
+ ret = ksz_pread8(dev, port, regs[P_FORCE_CTRL], &ctrl);
+ if (ret)
+ return ret;
+
+ if (restart & PORT_PHY_LOOPBACK)
+ *val |= BMCR_LOOPBACK;
+
+ if (ctrl & PORT_FORCE_100_MBIT)
+ *val |= BMCR_SPEED100;
+
+ if (ksz_is_ksz88x3(dev)) {
+ if ((ctrl & PORT_AUTO_NEG_ENABLE))
+ *val |= BMCR_ANENABLE;
+ } else {
+ if (!(ctrl & PORT_AUTO_NEG_DISABLE))
+ *val |= BMCR_ANENABLE;
+ }
+
+ if (restart & PORT_POWER_DOWN)
+ *val |= BMCR_PDOWN;
+
+ if (restart & PORT_AUTO_NEG_RESTART)
+ *val |= BMCR_ANRESTART;
+
+ if (ctrl & PORT_FORCE_FULL_DUPLEX)
+ *val |= BMCR_FULLDPLX;
+
+ if (speed & PORT_HP_MDIX)
+ *val |= KSZ886X_BMCR_HP_MDIX;
+
+ if (restart & PORT_FORCE_MDIX)
+ *val |= KSZ886X_BMCR_FORCE_MDI;
+
+ if (restart & PORT_AUTO_MDIX_DISABLE)
+ *val |= KSZ886X_BMCR_DISABLE_AUTO_MDIX;
+
+ if (restart & PORT_TX_DISABLE)
+ *val |= KSZ886X_BMCR_DISABLE_TRANSMIT;
+
+ if (restart & PORT_LED_OFF)
+ *val |= KSZ886X_BMCR_DISABLE_LED;
+
+ return 0;
+}
+
int ksz8_r_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 *val)
{
- u8 restart, speed, ctrl, link;
+ u8 ctrl, link, val1, val2;
int processed = true;
const u16 *regs;
- u8 val1, val2;
u16 data = 0;
- u8 p = phy;
+ u16 p = phy;
int ret;
regs = dev->info->regs;
switch (reg) {
case MII_BMCR:
- ret = ksz_pread8(dev, p, regs[P_NEG_RESTART_CTRL], &restart);
+ ret = ksz8_r_phy_bmcr(dev, p, &data);
if (ret)
return ret;
-
- ret = ksz_pread8(dev, p, regs[P_SPEED_STATUS], &speed);
- if (ret)
- return ret;
-
- ret = ksz_pread8(dev, p, regs[P_FORCE_CTRL], &ctrl);
- if (ret)
- return ret;
-
- if (restart & PORT_PHY_LOOPBACK)
- data |= BMCR_LOOPBACK;
- if (ctrl & PORT_FORCE_100_MBIT)
- data |= BMCR_SPEED100;
- if (ksz_is_ksz88x3(dev)) {
- if ((ctrl & PORT_AUTO_NEG_ENABLE))
- data |= BMCR_ANENABLE;
- } else {
- if (!(ctrl & PORT_AUTO_NEG_DISABLE))
- data |= BMCR_ANENABLE;
- }
- if (restart & PORT_POWER_DOWN)
- data |= BMCR_PDOWN;
- if (restart & PORT_AUTO_NEG_RESTART)
- data |= BMCR_ANRESTART;
- if (ctrl & PORT_FORCE_FULL_DUPLEX)
- data |= BMCR_FULLDPLX;
- if (speed & PORT_HP_MDIX)
- data |= KSZ886X_BMCR_HP_MDIX;
- if (restart & PORT_FORCE_MDIX)
- data |= KSZ886X_BMCR_FORCE_MDI;
- if (restart & PORT_AUTO_MDIX_DISABLE)
- data |= KSZ886X_BMCR_DISABLE_AUTO_MDIX;
- if (restart & PORT_TX_DISABLE)
- data |= KSZ886X_BMCR_DISABLE_TRANSMIT;
- if (restart & PORT_LED_OFF)
- data |= KSZ886X_BMCR_DISABLE_LED;
break;
case MII_BMSR:
ret = ksz_pread8(dev, p, regs[P_LINK_STATUS], &link);
@@ -860,113 +919,168 @@ static int ksz8_w_phy_ctrl(struct ksz_device *dev, int port, u16 val)
return ret;
}
-int ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val)
+/**
+ * ksz8_w_phy_bmcr - Translates and writes to the SMI interface from a MIIM PHY
+ * Basic mode control register (Reg. 0).
+ * @dev: The KSZ device instance.
+ * @port: The port number to be configured.
+ * @val: The register value to be written.
+ *
+ * This function translates control settings from a MIIM PHY Basic mode control
+ * register into their corresponding hardware register bit values for the SMI
+ * interface.
+ *
+ * MIIM Bit Mapping Comparison between KSZ8794 and KSZ8873
+ * -------------------------------------------------------------------
+ * MIIM Bit | KSZ8794 Reg/Bit | KSZ8873 Reg/Bit
+ * ----------------------------+-----------------------------+----------------
+ * Bit 15 - Soft Reset | 0xF/4 | Not supported
+ * Bit 14 - Loopback | 0xD/0 (MAC), 0xF/7 (PHY) ~ 0xD/0 (PHY)
+ * Bit 13 - Force 100 | 0xC/6 = 0xC/6
+ * Bit 12 - AN Enable | 0xC/7 (reverse logic) ~ 0xC/7
+ * Bit 11 - Power Down | 0xD/3 = 0xD/3
+ * Bit 10 - PHY Isolate | 0xF/5 | Not supported
+ * Bit 9 - Restart AN | 0xD/5 = 0xD/5
+ * Bit 8 - Force Full-Duplex | 0xC/5 = 0xC/5
+ * Bit 7 - Collision Test/Res. | Not supported | Not supported
+ * Bit 6 - Reserved | Not supported | Not supported
+ * Bit 5 - Hp_mdix | 0x9/7 ~ 0xF/7
+ * Bit 4 - Force MDI | 0xD/1 = 0xD/1
+ * Bit 3 - Disable MDIX | 0xD/2 = 0xD/2
+ * Bit 2 - Disable Far-End F. | ???? | 0xD/4
+ * Bit 1 - Disable Transmit | 0xD/6 = 0xD/6
+ * Bit 0 - Disable LED | 0xD/7 = 0xD/7
+ * -------------------------------------------------------------------
+ *
+ * Return: 0 on success, error code on failure.
+ */
+static int ksz8_w_phy_bmcr(struct ksz_device *dev, u16 port, u16 val)
{
- u8 restart, speed, ctrl, data;
- const u16 *regs;
- u8 p = phy;
+ const u16 *regs = dev->info->regs;
+ u8 restart, ctrl, speed, data;
int ret;
- regs = dev->info->regs;
+ /* Do not support PHY reset function. */
+ if (val & BMCR_RESET)
+ return 0;
- switch (reg) {
- case MII_BMCR:
+ ret = ksz_pread8(dev, port, regs[P_SPEED_STATUS], &speed);
+ if (ret)
+ return ret;
- /* Do not support PHY reset function. */
- if (val & BMCR_RESET)
- break;
- ret = ksz_pread8(dev, p, regs[P_SPEED_STATUS], &speed);
+ data = speed;
+ if (val & KSZ886X_BMCR_HP_MDIX)
+ data |= PORT_HP_MDIX;
+ else
+ data &= ~PORT_HP_MDIX;
+
+ if (data != speed) {
+ ret = ksz_pwrite8(dev, port, regs[P_SPEED_STATUS], data);
if (ret)
return ret;
+ }
+
+ ret = ksz_pread8(dev, port, regs[P_FORCE_CTRL], &ctrl);
+ if (ret)
+ return ret;
- data = speed;
- if (val & KSZ886X_BMCR_HP_MDIX)
- data |= PORT_HP_MDIX;
+ data = ctrl;
+ if (ksz_is_ksz88x3(dev)) {
+ if ((val & BMCR_ANENABLE))
+ data |= PORT_AUTO_NEG_ENABLE;
+ else
+ data &= ~PORT_AUTO_NEG_ENABLE;
+ } else {
+ if (!(val & BMCR_ANENABLE))
+ data |= PORT_AUTO_NEG_DISABLE;
else
- data &= ~PORT_HP_MDIX;
+ data &= ~PORT_AUTO_NEG_DISABLE;
- if (data != speed) {
- ret = ksz_pwrite8(dev, p, regs[P_SPEED_STATUS], data);
- if (ret)
- return ret;
- }
+ /* Fiber port does not support auto-negotiation. */
+ if (dev->ports[port].fiber)
+ data |= PORT_AUTO_NEG_DISABLE;
+ }
+
+ if (val & BMCR_SPEED100)
+ data |= PORT_FORCE_100_MBIT;
+ else
+ data &= ~PORT_FORCE_100_MBIT;
+
+ if (val & BMCR_FULLDPLX)
+ data |= PORT_FORCE_FULL_DUPLEX;
+ else
+ data &= ~PORT_FORCE_FULL_DUPLEX;
- ret = ksz_pread8(dev, p, regs[P_FORCE_CTRL], &ctrl);
+ if (data != ctrl) {
+ ret = ksz_pwrite8(dev, port, regs[P_FORCE_CTRL], data);
if (ret)
return ret;
+ }
- data = ctrl;
- if (ksz_is_ksz88x3(dev)) {
- if ((val & BMCR_ANENABLE))
- data |= PORT_AUTO_NEG_ENABLE;
- else
- data &= ~PORT_AUTO_NEG_ENABLE;
- } else {
- if (!(val & BMCR_ANENABLE))
- data |= PORT_AUTO_NEG_DISABLE;
- else
- data &= ~PORT_AUTO_NEG_DISABLE;
-
- /* Fiber port does not support auto-negotiation. */
- if (dev->ports[p].fiber)
- data |= PORT_AUTO_NEG_DISABLE;
- }
+ ret = ksz_pread8(dev, port, regs[P_NEG_RESTART_CTRL], &restart);
+ if (ret)
+ return ret;
- if (val & BMCR_SPEED100)
- data |= PORT_FORCE_100_MBIT;
- else
- data &= ~PORT_FORCE_100_MBIT;
- if (val & BMCR_FULLDPLX)
- data |= PORT_FORCE_FULL_DUPLEX;
- else
- data &= ~PORT_FORCE_FULL_DUPLEX;
+ data = restart;
+ if (val & KSZ886X_BMCR_DISABLE_LED)
+ data |= PORT_LED_OFF;
+ else
+ data &= ~PORT_LED_OFF;
- if (data != ctrl) {
- ret = ksz_pwrite8(dev, p, regs[P_FORCE_CTRL], data);
- if (ret)
- return ret;
- }
+ if (val & KSZ886X_BMCR_DISABLE_TRANSMIT)
+ data |= PORT_TX_DISABLE;
+ else
+ data &= ~PORT_TX_DISABLE;
- ret = ksz_pread8(dev, p, regs[P_NEG_RESTART_CTRL], &restart);
+ if (val & BMCR_ANRESTART)
+ data |= PORT_AUTO_NEG_RESTART;
+ else
+ data &= ~(PORT_AUTO_NEG_RESTART);
+
+ if (val & BMCR_PDOWN)
+ data |= PORT_POWER_DOWN;
+ else
+ data &= ~PORT_POWER_DOWN;
+
+ if (val & KSZ886X_BMCR_DISABLE_AUTO_MDIX)
+ data |= PORT_AUTO_MDIX_DISABLE;
+ else
+ data &= ~PORT_AUTO_MDIX_DISABLE;
+
+ if (val & KSZ886X_BMCR_FORCE_MDI)
+ data |= PORT_FORCE_MDIX;
+ else
+ data &= ~PORT_FORCE_MDIX;
+
+ if (val & BMCR_LOOPBACK)
+ data |= PORT_PHY_LOOPBACK;
+ else
+ data &= ~PORT_PHY_LOOPBACK;
+
+ if (data != restart) {
+ ret = ksz_pwrite8(dev, port, regs[P_NEG_RESTART_CTRL],
+ data);
if (ret)
return ret;
+ }
- data = restart;
- if (val & KSZ886X_BMCR_DISABLE_LED)
- data |= PORT_LED_OFF;
- else
- data &= ~PORT_LED_OFF;
- if (val & KSZ886X_BMCR_DISABLE_TRANSMIT)
- data |= PORT_TX_DISABLE;
- else
- data &= ~PORT_TX_DISABLE;
- if (val & BMCR_ANRESTART)
- data |= PORT_AUTO_NEG_RESTART;
- else
- data &= ~(PORT_AUTO_NEG_RESTART);
- if (val & BMCR_PDOWN)
- data |= PORT_POWER_DOWN;
- else
- data &= ~PORT_POWER_DOWN;
- if (val & KSZ886X_BMCR_DISABLE_AUTO_MDIX)
- data |= PORT_AUTO_MDIX_DISABLE;
- else
- data &= ~PORT_AUTO_MDIX_DISABLE;
- if (val & KSZ886X_BMCR_FORCE_MDI)
- data |= PORT_FORCE_MDIX;
- else
- data &= ~PORT_FORCE_MDIX;
- if (val & BMCR_LOOPBACK)
- data |= PORT_PHY_LOOPBACK;
- else
- data &= ~PORT_PHY_LOOPBACK;
+ return 0;
+}
- if (data != restart) {
- ret = ksz_pwrite8(dev, p, regs[P_NEG_RESTART_CTRL],
- data);
- if (ret)
- return ret;
- }
+int ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val)
+{
+ const u16 *regs;
+ u8 ctrl, data;
+ u16 p = phy;
+ int ret;
+
+ regs = dev->info->regs;
+
+ switch (reg) {
+ case MII_BMCR:
+ ret = ksz8_w_phy_bmcr(dev, p, val);
+ if (ret)
+ return ret;
break;
case MII_ADVERTISE:
ret = ksz_pread8(dev, p, regs[P_LOCAL_CTRL], &ctrl);
--
2.39.2
^ permalink raw reply [flat|nested] 6+ messages in thread* [RFC net-next v3 2/3] net: dsa: microchip: Remove redundant optimization in ksz8_w_phy_bmcr
2024-01-12 14:07 [RFC net-next v3 0/3] net: dsa: microchip: implement PHY loopback Oleksij Rempel
2024-01-12 14:07 ` [RFC net-next v3 1/3] net: dsa: microchip: ksz8: move BMCR specific code to separate function Oleksij Rempel
@ 2024-01-12 14:07 ` Oleksij Rempel
2024-01-12 14:07 ` [RFC net-next v3 3/3] net: dsa: microchip: implement PHY loopback configuration for KSZ8794 and KSZ8873 Oleksij Rempel
2 siblings, 0 replies; 6+ messages in thread
From: Oleksij Rempel @ 2024-01-12 14:07 UTC (permalink / raw)
To: David S. Miller, Andrew Lunn, Eric Dumazet, Florian Fainelli,
Jakub Kicinski, Paolo Abeni, Vladimir Oltean, Woojung Huh,
Arun Ramadoss
Cc: Oleksij Rempel, Vladimir Oltean, kernel, linux-kernel, netdev,
UNGLinuxDriver
Remove the manual checks for register value changes in the
ksz8_w_phy_bmcr function. Instead, rely on regmap_update_bits() for
optimizing register updates.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>
---
drivers/net/dsa/microchip/ksz8795.c | 96 +++++++++--------------------
1 file changed, 29 insertions(+), 67 deletions(-)
diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 1269dde832bd..51e0194453df 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -956,115 +956,77 @@ static int ksz8_w_phy_ctrl(struct ksz_device *dev, int port, u16 val)
*/
static int ksz8_w_phy_bmcr(struct ksz_device *dev, u16 port, u16 val)
{
+ u8 restart, speed, ctrl, restart_mask;
const u16 *regs = dev->info->regs;
- u8 restart, ctrl, speed, data;
int ret;
/* Do not support PHY reset function. */
if (val & BMCR_RESET)
return 0;
- ret = ksz_pread8(dev, port, regs[P_SPEED_STATUS], &speed);
- if (ret)
- return ret;
-
- data = speed;
+ speed = 0;
if (val & KSZ886X_BMCR_HP_MDIX)
- data |= PORT_HP_MDIX;
- else
- data &= ~PORT_HP_MDIX;
-
- if (data != speed) {
- ret = ksz_pwrite8(dev, port, regs[P_SPEED_STATUS], data);
- if (ret)
- return ret;
- }
+ speed |= PORT_HP_MDIX;
- ret = ksz_pread8(dev, port, regs[P_FORCE_CTRL], &ctrl);
+ ret = ksz_prmw8(dev, port, regs[P_SPEED_STATUS], PORT_HP_MDIX, speed);
if (ret)
return ret;
- data = ctrl;
+ ctrl = 0;
if (ksz_is_ksz88x3(dev)) {
if ((val & BMCR_ANENABLE))
- data |= PORT_AUTO_NEG_ENABLE;
- else
- data &= ~PORT_AUTO_NEG_ENABLE;
+ ctrl |= PORT_AUTO_NEG_ENABLE;
} else {
if (!(val & BMCR_ANENABLE))
- data |= PORT_AUTO_NEG_DISABLE;
- else
- data &= ~PORT_AUTO_NEG_DISABLE;
+ ctrl |= PORT_AUTO_NEG_DISABLE;
/* Fiber port does not support auto-negotiation. */
if (dev->ports[port].fiber)
- data |= PORT_AUTO_NEG_DISABLE;
+ ctrl |= PORT_AUTO_NEG_DISABLE;
}
if (val & BMCR_SPEED100)
- data |= PORT_FORCE_100_MBIT;
- else
- data &= ~PORT_FORCE_100_MBIT;
+ ctrl |= PORT_FORCE_100_MBIT;
if (val & BMCR_FULLDPLX)
- data |= PORT_FORCE_FULL_DUPLEX;
- else
- data &= ~PORT_FORCE_FULL_DUPLEX;
-
- if (data != ctrl) {
- ret = ksz_pwrite8(dev, port, regs[P_FORCE_CTRL], data);
- if (ret)
- return ret;
- }
+ ctrl |= PORT_FORCE_FULL_DUPLEX;
- ret = ksz_pread8(dev, port, regs[P_NEG_RESTART_CTRL], &restart);
+ ret = ksz_prmw8(dev, port, regs[P_FORCE_CTRL], PORT_FORCE_100_MBIT |
+ /* PORT_AUTO_NEG_ENABLE and PORT_AUTO_NEG_DISABLE are the same
+ * bits
+ */
+ PORT_FORCE_FULL_DUPLEX | PORT_AUTO_NEG_ENABLE, ctrl);
if (ret)
return ret;
- data = restart;
+ restart = 0;
+ restart_mask = PORT_LED_OFF | PORT_TX_DISABLE | PORT_AUTO_NEG_RESTART |
+ PORT_POWER_DOWN | PORT_AUTO_MDIX_DISABLE | PORT_FORCE_MDIX |
+ PORT_PHY_LOOPBACK;
+
if (val & KSZ886X_BMCR_DISABLE_LED)
- data |= PORT_LED_OFF;
- else
- data &= ~PORT_LED_OFF;
+ restart |= PORT_LED_OFF;
if (val & KSZ886X_BMCR_DISABLE_TRANSMIT)
- data |= PORT_TX_DISABLE;
- else
- data &= ~PORT_TX_DISABLE;
+ restart |= PORT_TX_DISABLE;
if (val & BMCR_ANRESTART)
- data |= PORT_AUTO_NEG_RESTART;
- else
- data &= ~(PORT_AUTO_NEG_RESTART);
+ restart |= PORT_AUTO_NEG_RESTART;
if (val & BMCR_PDOWN)
- data |= PORT_POWER_DOWN;
- else
- data &= ~PORT_POWER_DOWN;
+ restart |= PORT_POWER_DOWN;
if (val & KSZ886X_BMCR_DISABLE_AUTO_MDIX)
- data |= PORT_AUTO_MDIX_DISABLE;
- else
- data &= ~PORT_AUTO_MDIX_DISABLE;
+ restart |= PORT_AUTO_MDIX_DISABLE;
if (val & KSZ886X_BMCR_FORCE_MDI)
- data |= PORT_FORCE_MDIX;
- else
- data &= ~PORT_FORCE_MDIX;
+ restart |= PORT_FORCE_MDIX;
if (val & BMCR_LOOPBACK)
- data |= PORT_PHY_LOOPBACK;
- else
- data &= ~PORT_PHY_LOOPBACK;
-
- if (data != restart) {
- ret = ksz_pwrite8(dev, port, regs[P_NEG_RESTART_CTRL],
- data);
- if (ret)
- return ret;
- }
+ restart |= PORT_PHY_LOOPBACK;
- return 0;
+ return ksz_prmw8(dev, port, regs[P_NEG_RESTART_CTRL], restart_mask,
+ restart);
}
int ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val)
--
2.39.2
^ permalink raw reply [flat|nested] 6+ messages in thread* [RFC net-next v3 3/3] net: dsa: microchip: implement PHY loopback configuration for KSZ8794 and KSZ8873
2024-01-12 14:07 [RFC net-next v3 0/3] net: dsa: microchip: implement PHY loopback Oleksij Rempel
2024-01-12 14:07 ` [RFC net-next v3 1/3] net: dsa: microchip: ksz8: move BMCR specific code to separate function Oleksij Rempel
2024-01-12 14:07 ` [RFC net-next v3 2/3] net: dsa: microchip: Remove redundant optimization in ksz8_w_phy_bmcr Oleksij Rempel
@ 2024-01-12 14:07 ` Oleksij Rempel
2024-01-16 2:50 ` Arun.Ramadoss
2024-01-16 13:51 ` Vladimir Oltean
2 siblings, 2 replies; 6+ messages in thread
From: Oleksij Rempel @ 2024-01-12 14:07 UTC (permalink / raw)
To: David S. Miller, Andrew Lunn, Eric Dumazet, Florian Fainelli,
Jakub Kicinski, Paolo Abeni, Vladimir Oltean, Woojung Huh,
Arun Ramadoss
Cc: Oleksij Rempel, kernel, linux-kernel, netdev, UNGLinuxDriver
Correct the PHY loopback bit handling in the ksz8_w_phy_bmcr and
ksz8_r_phy_bmcr functions for KSZ8794 and KSZ8873 variants in the ksz8795
driver. Previously, the code erroneously used Bit 7 of port register 0xD
for both chip variants, which is actually for LED configuration. This
update ensures the correct registers and bits are used for the PHY
loopback feature:
- For KSZ8794: Use 0xF / Bit 7.
- For KSZ8873: Use 0xD / Bit 0.
The lack of loopback support was seen on KSZ8873 system by using
"ethtool -t lanX". After this patch, the ethtool selftest will work,
but only if port is not part of a bridge.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
drivers/net/dsa/microchip/ksz8795.c | 76 ++++++++++++++++++++++---
drivers/net/dsa/microchip/ksz8795_reg.h | 1 +
2 files changed, 70 insertions(+), 7 deletions(-)
diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 51e0194453df..50351cef6ca5 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -632,6 +632,57 @@ static void ksz8_w_vlan_table(struct ksz_device *dev, u16 vid, u16 vlan)
ksz8_w_table(dev, TABLE_VLAN, addr, buf);
}
+/**
+ * ksz879x_get_loopback - KSZ879x specific function to get loopback
+ * configuration status for a specific port
+ * @dev: Pointer to the device structure
+ * @port: Port number to query
+ * @val: Pointer to store the result
+ *
+ * This function reads the SMI registers to determine whether loopback mode
+ * is enabled for a specific port.
+ *
+ * Return: 0 on success, error code on failure.
+ */
+static int ksz879x_get_loopback(struct ksz_device *dev, u16 port,
+ u16 *val)
+{
+ u8 stat3;
+ int ret;
+
+ ret = ksz_pread8(dev, port, REG_PORT_STATUS_3, &stat3);
+ if (ret)
+ return ret;
+
+ if (stat3 & PORT_PHY_LOOPBACK)
+ *val |= BMCR_LOOPBACK;
+
+ return 0;
+}
+
+/**
+ * ksz879x_set_loopback - KSZ879x specific function to set loopback mode for
+ * a specific port
+ * @dev: Pointer to the device structure.
+ * @port: Port number to modify.
+ * @val: Value indicating whether to enable or disable loopback mode.
+ *
+ * This function translates loopback bit of the BMCR register into the
+ * corresponding hardware register bit value and writes it to the SMI interface.
+ *
+ * Return: 0 on success, error code on failure.
+ */
+static int ksz879x_set_loopback(struct ksz_device *dev, u16 port, u16 val)
+{
+ u8 stat3 = 0;
+
+ if (val & BMCR_LOOPBACK)
+ stat3 |= PORT_PHY_LOOPBACK;
+
+ return ksz_prmw8(dev, port, REG_PORT_STATUS_3, PORT_PHY_LOOPBACK,
+ stat3);
+}
+
/**
* ksz8_r_phy_ctrl - Translates and reads from the SMI interface to a MIIM PHY
* Control register (Reg. 31).
@@ -731,16 +782,20 @@ static int ksz8_r_phy_bmcr(struct ksz_device *dev, u16 port, u16 *val)
if (ret)
return ret;
- if (restart & PORT_PHY_LOOPBACK)
- *val |= BMCR_LOOPBACK;
-
if (ctrl & PORT_FORCE_100_MBIT)
*val |= BMCR_SPEED100;
if (ksz_is_ksz88x3(dev)) {
+ if (restart & KSZ8873_PORT_PHY_LOOPBACK)
+ *val |= BMCR_LOOPBACK;
+
if ((ctrl & PORT_AUTO_NEG_ENABLE))
*val |= BMCR_ANENABLE;
} else {
+ ret = ksz879x_get_loopback(dev, port, val);
+ if (ret)
+ return ret;
+
if (!(ctrl & PORT_AUTO_NEG_DISABLE))
*val |= BMCR_ANENABLE;
}
@@ -1001,8 +1056,7 @@ static int ksz8_w_phy_bmcr(struct ksz_device *dev, u16 port, u16 val)
restart = 0;
restart_mask = PORT_LED_OFF | PORT_TX_DISABLE | PORT_AUTO_NEG_RESTART |
- PORT_POWER_DOWN | PORT_AUTO_MDIX_DISABLE | PORT_FORCE_MDIX |
- PORT_PHY_LOOPBACK;
+ PORT_POWER_DOWN | PORT_AUTO_MDIX_DISABLE | PORT_FORCE_MDIX;
if (val & KSZ886X_BMCR_DISABLE_LED)
restart |= PORT_LED_OFF;
@@ -1022,8 +1076,16 @@ static int ksz8_w_phy_bmcr(struct ksz_device *dev, u16 port, u16 val)
if (val & KSZ886X_BMCR_FORCE_MDI)
restart |= PORT_FORCE_MDIX;
- if (val & BMCR_LOOPBACK)
- restart |= PORT_PHY_LOOPBACK;
+ if (ksz_is_ksz88x3(dev)) {
+ restart_mask |= KSZ8873_PORT_PHY_LOOPBACK;
+
+ if (val & BMCR_LOOPBACK)
+ restart |= KSZ8873_PORT_PHY_LOOPBACK;
+ } else {
+ ret = ksz879x_set_loopback(dev, port, val);
+ if (ret)
+ return ret;
+ }
return ksz_prmw8(dev, port, regs[P_NEG_RESTART_CTRL], restart_mask,
restart);
diff --git a/drivers/net/dsa/microchip/ksz8795_reg.h b/drivers/net/dsa/microchip/ksz8795_reg.h
index beca974e0171..7c9341ef73b0 100644
--- a/drivers/net/dsa/microchip/ksz8795_reg.h
+++ b/drivers/net/dsa/microchip/ksz8795_reg.h
@@ -265,6 +265,7 @@
#define PORT_AUTO_MDIX_DISABLE BIT(2)
#define PORT_FORCE_MDIX BIT(1)
#define PORT_MAC_LOOPBACK BIT(0)
+#define KSZ8873_PORT_PHY_LOOPBACK BIT(0)
#define REG_PORT_1_STATUS_2 0x1E
#define REG_PORT_2_STATUS_2 0x2E
--
2.39.2
^ permalink raw reply [flat|nested] 6+ messages in thread