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net: pcs: xpcs: re-initiate clause 37 Auto-negotiation

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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@linux.intel.com>
Link: https://patch.msgid.link/20250227121522.1802832-3-yong.liang.choong@linux.intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Choong Yong Liang 2025-02-27 20:15:18 +08:00 committed by Jakub Kicinski
parent b63263555e
commit 065d3cef99
1 changed files with 21 additions and 4 deletions
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25
drivers/net/pcs/pcs-xpcs.c
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@ -602,12 +602,33 @@ 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->info.pma == WX_TXGBE_XPCS_PMA_10G_ID) {
ret = txgbe_xpcs_switch_mode(xpcs, interface);
} else if (xpcs->interface != interface) {
if (interface == PHY_INTERFACE_MODE_SGMII)
xpcs->need_reset = true;
xpcs->interface = interface;
}
return ret;
}
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 +820,6 @@ 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
*/