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generic: interface mode switch for RTL8221B PHY

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Add dynamic interface mode update for the rtl8221 phy to match various
wire speeds. 10M/100M/1000M use SGMII, 2500M uses 2500Base-X.

Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Chukun Pan 2023-02-08 23:40:02 +08:00 committed by Daniel Golle
parent 5a8741aee9
commit db37999170
1 changed files with 61 additions and 0 deletions
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61
target/linux/generic/pending-5.15/722-net-phy-realtek-support-switching-between-SGMII-and-.patch Normal file
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@ -0,0 +1,61 @@
From 312753d0aadba0f58841ae513b80fdbabc887523 Mon Sep 17 00:00:00 2001
From: Chukun Pan <amadeus@jmu.edu.cn>
Date: Wed, 8 Feb 2023 16:32:18 +0800
Subject: [PATCH] net: phy: realtek: support switching between SGMII and
2500BASE-X for RTL822x series
After commit ace6aba ("net: phy: realtek: rtl8221: allow to configure
SERDES mode"), the rtl8221 phy can work in SGMII and 2500base-x modes
respectively. So add interface automatic switching for rtl8221 phy to
match various wire speeds.
Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
---
drivers/net/phy/realtek.c | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -676,6 +676,25 @@ static int rtl822x_config_aneg(struct ph
return __genphy_config_aneg(phydev, ret);
}
+static void rtl822x_update_interface(struct phy_device *phydev)
+{
+ /* Automatically switch SERDES interface between
+ * SGMII and 2500-BaseX according to speed.
+ */
+ switch (phydev->speed) {
+ case SPEED_2500:
+ phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
+ break;
+ case SPEED_1000:
+ case SPEED_100:
+ case SPEED_10:
+ phydev->interface = PHY_INTERFACE_MODE_SGMII;
+ break;
+ default:
+ break;
+ }
+}
+
static int rtl822x_read_status(struct phy_device *phydev)
{
int ret;
@@ -694,11 +713,14 @@ static int rtl822x_read_status(struct ph
phydev->lp_advertising, lpadv & RTL_LPADV_2500FULL);
}
- ret = genphy_read_status(phydev);
+ ret = rtlgen_read_status(phydev);
if (ret < 0)
return ret;
- return rtlgen_get_speed(phydev);
+ if (phydev->link)
+ rtl822x_update_interface(phydev);
+
+ return 0;
}
static bool rtlgen_supports_2_5gbps(struct phy_device *phydev)