[PATCH net-next v8 2/6] net: pcs: xpcs: re-initiate clause 37 Auto-negotiation
Choong Yong Liang
yong.liang.choong at linux.intel.com
Tue Feb 25 23:48:33 PST 2025
The xpcs_switch_interface_mode function was introduced to handle
interface switching.
According to the XPCS datasheet, a soft reset is required to initiate
Clause 37 auto-negotiation when the XPCS switches interface modes.
When the interface mode switches from 2500BASE-X to SGMII,
re-initiating Clause 37 auto-negotiation is required for the SGMII
interface mode to function properly.
Signed-off-by: Choong Yong Liang <yong.liang.choong at linux.intel.com>
---
drivers/net/pcs/pcs-xpcs-wx.c | 4 +---
drivers/net/pcs/pcs-xpcs.c | 29 +++++++++++++++++++++++++----
2 files changed, 26 insertions(+), 7 deletions(-)
diff --git a/drivers/net/pcs/pcs-xpcs-wx.c b/drivers/net/pcs/pcs-xpcs-wx.c
index fc52f7aa5f59..f73ab04d09f0 100644
--- a/drivers/net/pcs/pcs-xpcs-wx.c
+++ b/drivers/net/pcs/pcs-xpcs-wx.c
@@ -172,11 +172,9 @@ int txgbe_xpcs_switch_mode(struct dw_xpcs *xpcs, phy_interface_t interface)
return 0;
}
- if (xpcs->interface == interface && !txgbe_xpcs_mode_quirk(xpcs))
+ if (!txgbe_xpcs_mode_quirk(xpcs))
return 0;
- xpcs->interface = interface;
-
ret = txgbe_pcs_poll_power_up(xpcs);
if (ret < 0)
return ret;
diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index e32dec4b812e..c506797f9b63 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -602,12 +602,37 @@ static void xpcs_get_interfaces(struct dw_xpcs *xpcs, unsigned long *interfaces)
__set_bit(compat->interface, interfaces);
}
+static int xpcs_switch_interface_mode(struct dw_xpcs *xpcs,
+ phy_interface_t interface)
+{
+ int ret = 0;
+
+ if (xpcs->interface != interface) {
+ if (xpcs->info.pma == WX_TXGBE_XPCS_PMA_10G_ID) {
+ ret = txgbe_xpcs_switch_mode(xpcs, interface);
+ if (ret)
+ return ret;
+ } else if (interface == PHY_INTERFACE_MODE_SGMII) {
+ xpcs->need_reset = true;
+ }
+
+ xpcs->interface = interface;
+ }
+
+ return 0;
+}
+
static void xpcs_pre_config(struct phylink_pcs *pcs, phy_interface_t interface)
{
struct dw_xpcs *xpcs = phylink_pcs_to_xpcs(pcs);
const struct dw_xpcs_compat *compat;
int ret;
+ ret = xpcs_switch_interface_mode(xpcs, interface);
+ if (ret)
+ dev_err(&xpcs->mdiodev->dev, "switch interface failed: %pe\n",
+ ERR_PTR(ret));
+
if (!xpcs->need_reset)
return;
@@ -799,10 +824,6 @@ static int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
return -ENODEV;
if (xpcs->info.pma == WX_TXGBE_XPCS_PMA_10G_ID) {
- ret = txgbe_xpcs_switch_mode(xpcs, interface);
- if (ret)
- return ret;
-
/* Wangxun devices need backplane CL37 AN enabled for
* SGMII and 1000base-X
*/
--
2.34.1
More information about the linux-arm-kernel
mailing list