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927fe598db
Add pending patch to make address some workaround needed to make the Aeonsemi AS21xxx PHY working on the Airoha AN7581/AN7583 board. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
133 lines
5.3 KiB
Diff
133 lines
5.3 KiB
Diff
From fabaa8a7183d10217e14af437fd3805bd6dd9eba Mon Sep 17 00:00:00 2001
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From: Christian Marangi <ansuelsmth@gmail.com>
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Date: Sat, 18 Oct 2025 04:12:41 +0200
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Subject: [PATCH] net: phy: as21xxx: implement read workaround for C45 read
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This PHY have lots of problems with MDIO read operation. We somehow
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workaround this with using C45 operation for pretty much everything but
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this is not enough. The reference code for this PHY makes a write to an
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unused PHY to workaround this read problem. This was also confirmed by
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Aeonsemi.
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Various test were made to try to workaround this ins alternative way
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than the random write.
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One effective solution was to limit the write only to BMSR. And also
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write to BMSR is safe since they are only read only registers.
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This is only done for read operation as write operation doesn't suffer
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from this problem.
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Worth to mention that when multiple Aeonsemi PHY are mounted, the
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workaround doesn't work if we write to another Aeonsemi PHY.
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Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
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---
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drivers/net/phy/as21xxx.c | 25 +++++++++++++++++++++++++
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1 file changed, 25 insertions(+)
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--- a/drivers/net/phy/as21xxx.c
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+++ b/drivers/net/phy/as21xxx.c
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@@ -966,6 +966,21 @@ out:
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return ret;
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}
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+static int as21xxx_read_mmd(struct phy_device *phydev, int devad,
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+ u16 regnum)
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+{
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+ struct mii_bus *bus = phydev->mdio.bus;
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+ int val;
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+
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+ val = __mdiobus_c45_read(bus, phydev->mdio.addr, devad,
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+ regnum);
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+
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+ /* FIXME: verify if it's actually ok to limit this to MII_BMSR */
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+ __mdiobus_write(bus, 0x0, MII_BMSR, 0x1);
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+
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+ return val;
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+}
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+
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static struct phy_driver as21xxx_drivers[] = {
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{
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/* PHY expose in C45 as 0x7500 0x9410
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@@ -983,6 +998,7 @@ static struct phy_driver as21xxx_drivers
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.probe = as21xxx_probe,
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.match_phy_device = as21xxx_match_phy_device,
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.read_status = as21xxx_read_status,
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+ .read_mmd = as21xxx_read_mmd,
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.led_brightness_set = as21xxx_led_brightness_set,
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.led_hw_is_supported = as21xxx_led_hw_is_supported,
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.led_hw_control_set = as21xxx_led_hw_control_set,
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@@ -996,6 +1012,7 @@ static struct phy_driver as21xxx_drivers
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.probe = as21xxx_probe,
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.match_phy_device = as21xxx_match_phy_device,
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.read_status = as21xxx_read_status,
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+ .read_mmd = as21xxx_read_mmd,
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.led_brightness_set = as21xxx_led_brightness_set,
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.led_hw_is_supported = as21xxx_led_hw_is_supported,
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.led_hw_control_set = as21xxx_led_hw_control_set,
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@@ -1009,6 +1026,7 @@ static struct phy_driver as21xxx_drivers
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.probe = as21xxx_probe,
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.match_phy_device = as21xxx_match_phy_device,
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.read_status = as21xxx_read_status,
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+ .read_mmd = as21xxx_read_mmd,
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.led_brightness_set = as21xxx_led_brightness_set,
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.led_hw_is_supported = as21xxx_led_hw_is_supported,
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.led_hw_control_set = as21xxx_led_hw_control_set,
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@@ -1022,6 +1040,7 @@ static struct phy_driver as21xxx_drivers
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.probe = as21xxx_probe,
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.match_phy_device = as21xxx_match_phy_device,
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.read_status = as21xxx_read_status,
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+ .read_mmd = as21xxx_read_mmd,
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.led_brightness_set = as21xxx_led_brightness_set,
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.led_hw_is_supported = as21xxx_led_hw_is_supported,
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.led_hw_control_set = as21xxx_led_hw_control_set,
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@@ -1035,6 +1054,7 @@ static struct phy_driver as21xxx_drivers
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.probe = as21xxx_probe,
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.match_phy_device = as21xxx_match_phy_device,
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.read_status = as21xxx_read_status,
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+ .read_mmd = as21xxx_read_mmd,
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.led_brightness_set = as21xxx_led_brightness_set,
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.led_hw_is_supported = as21xxx_led_hw_is_supported,
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.led_hw_control_set = as21xxx_led_hw_control_set,
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@@ -1048,6 +1068,7 @@ static struct phy_driver as21xxx_drivers
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.probe = as21xxx_probe,
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.match_phy_device = as21xxx_match_phy_device,
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.read_status = as21xxx_read_status,
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+ .read_mmd = as21xxx_read_mmd,
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.led_brightness_set = as21xxx_led_brightness_set,
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.led_hw_is_supported = as21xxx_led_hw_is_supported,
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.led_hw_control_set = as21xxx_led_hw_control_set,
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@@ -1061,6 +1082,7 @@ static struct phy_driver as21xxx_drivers
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.probe = as21xxx_probe,
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.match_phy_device = as21xxx_match_phy_device,
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.read_status = as21xxx_read_status,
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+ .read_mmd = as21xxx_read_mmd,
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.led_brightness_set = as21xxx_led_brightness_set,
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.led_hw_is_supported = as21xxx_led_hw_is_supported,
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.led_hw_control_set = as21xxx_led_hw_control_set,
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@@ -1074,6 +1096,7 @@ static struct phy_driver as21xxx_drivers
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.probe = as21xxx_probe,
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.match_phy_device = as21xxx_match_phy_device,
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.read_status = as21xxx_read_status,
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+ .read_mmd = as21xxx_read_mmd,
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.led_brightness_set = as21xxx_led_brightness_set,
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.led_hw_is_supported = as21xxx_led_hw_is_supported,
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.led_hw_control_set = as21xxx_led_hw_control_set,
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@@ -1087,6 +1110,7 @@ static struct phy_driver as21xxx_drivers
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.probe = as21xxx_probe,
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.match_phy_device = as21xxx_match_phy_device,
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.read_status = as21xxx_read_status,
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+ .read_mmd = as21xxx_read_mmd,
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.led_brightness_set = as21xxx_led_brightness_set,
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.led_hw_is_supported = as21xxx_led_hw_is_supported,
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.led_hw_control_set = as21xxx_led_hw_control_set,
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@@ -1100,6 +1124,7 @@ static struct phy_driver as21xxx_drivers
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.probe = as21xxx_probe,
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.match_phy_device = as21xxx_match_phy_device,
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.read_status = as21xxx_read_status,
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+ .read_mmd = as21xxx_read_mmd,
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.led_brightness_set = as21xxx_led_brightness_set,
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.led_hw_is_supported = as21xxx_led_hw_is_supported,
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.led_hw_control_set = as21xxx_led_hw_control_set,
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