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From: Marco Felsch <m.felsch@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 6/7] net: phy: at803x: add disable hibernation mode support
Date: Mon, 10 Jul 2023 08:36:52 +0200	[thread overview]
Message-ID: <20230710063653.660040-6-m.felsch@pengutronix.de> (raw)
In-Reply-To: <20230710063653.660040-1-m.felsch@pengutronix.de>

This commit ports Linux commit:

| commit 9ecf04016c87bcb33b44e24489d33618e2592f41
| Author: Wei Fang <wei.fang@nxp.com>
| Date:   Thu Aug 18 11:00:54 2022 +0800
|
|     net: phy: at803x: add disable hibernation mode support
|
|     When the cable is unplugged, the Atheros AR803x PHYs will enter
|     hibernation mode after about 10 seconds if the hibernation mode
|     is enabled and will not provide any clock to the MAC. But for
|     some MACs, this feature might cause unexpected issues due to the
|     logic of MACs.
|     Taking SYNP MAC (stmmac) as an example, if the cable is unplugged
|     and the "eth0" interface is down, the AR803x PHY will enter
|     hibernation mode. Then perform the "ifconfig eth0 up" operation,
|     the stmmac can't be able to complete the software reset operation
|     and fail to init it's own DMA. Therefore, the "eth0" interface is
|     failed to ifconfig up. Why does it cause this issue? The truth is
|     that the software reset operation of the stmmac is designed to
|     depend on the RX_CLK of PHY.
|     So, this patch offers an option for the user to determine whether
|     to disable the hibernation mode of AR803x PHYs.
|
|     Signed-off-by: Wei Fang <wei.fang@nxp.com>
|     Reviewed-by: Andrew Lunn <andrew@lunn.ch>
|     Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
 drivers/net/phy/at803x.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index cc425c318f..d8a9c3588f 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -32,6 +32,9 @@
 #define AT803X_DEBUG_REG_5			0x05
 #define AT803X_DEBUG_TX_CLK_DLY_EN		BIT(8)
 
+#define AT803X_DEBUG_REG_HIB_CTRL		0x0b
+#define   AT803X_DEBUG_HIB_CTRL_PS_HIB_EN	BIT(15)
+
 /* AT803x supports either the XTAL input pad, an internal PLL or the
  * DSP as clock reference for the clock output pad. The XTAL reference
  * is only used for 25 MHz output, all other frequencies need the PLL.
@@ -140,6 +143,20 @@ static int at803x_disable_tx_delay(struct phy_device *phydev)
 				     AT803X_DEBUG_TX_CLK_DLY_EN, 0);
 }
 
+static int at803x_hibernation_mode_config(struct phy_device *phydev)
+{
+	struct at803x_priv *priv = phydev->priv;
+
+	/* The default after hardware reset is hibernation mode enabled. After
+	 * software reset, the value is retained.
+	 */
+	if (!(priv->flags & AT803X_DISABLE_HIBERNATION_MODE))
+		return 0;
+
+	return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_HIB_CTRL,
+				     AT803X_DEBUG_HIB_CTRL_PS_HIB_EN, 0);
+}
+
 static bool at803x_match_phy_id(struct phy_device *phydev, u32 phy_id)
 {
 	struct phy_driver *drv = to_phy_driver(phydev->dev.driver);
@@ -160,6 +177,9 @@ static int at803x_parse_dt(struct phy_device *phydev)
 	if (of_property_read_bool(node, "qca,disable-smarteee"))
 		priv->flags |= AT803X_DISABLE_SMARTEEE;
 
+	if (of_property_read_bool(node, "qca,disable-hibernation-mode"))
+		priv->flags |= AT803X_DISABLE_HIBERNATION_MODE;
+
 	if (!of_property_read_u32(node, "qca,smarteee-tw-us-1g", &tw)) {
 		if (!tw || tw > 255) {
 			phydev_err(phydev, "invalid qca,smarteee-tw-us-1g\n");
@@ -341,6 +361,10 @@ static int at803x_config_init(struct phy_device *phydev)
 	if (ret < 0)
 		return ret;
 
+	ret = at803x_hibernation_mode_config(phydev);
+	if (ret < 0)
+		return ret;
+
 	return 0;
 }
 
-- 
2.39.2




  parent reply	other threads:[~2023-07-10  6:38 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-10  6:36 [PATCH 1/7] ARM: boards: make use of MDIO_MMD register defines Marco Felsch
2023-07-10  6:36 ` [PATCH 2/7] net: phy: micrel: " Marco Felsch
2023-07-10  9:56   ` Ahmad Fatoum
2023-07-10 10:37     ` Marco Felsch
2023-07-10  6:36 ` [PATCH 3/7] net: phy: sync phy_{write,read,modify}_mmd_indirect with linux Marco Felsch
2023-07-10  9:59   ` Ahmad Fatoum
2023-07-10 10:49     ` Marco Felsch
2023-07-10 10:53       ` Ahmad Fatoum
2023-07-10 11:01         ` Marco Felsch
2023-07-10 11:03           ` Ahmad Fatoum
2023-07-10 12:43             ` Marco Felsch
2023-07-10 12:52               ` Ahmad Fatoum
2023-07-10  6:36 ` [PATCH 4/7] net: phy: add phydev_{err,err_probe,info,warn,dbg} macros Marco Felsch
2023-07-10 10:01   ` Ahmad Fatoum
2023-07-10  6:36 ` [PATCH 5/7] net: phy: at803x: add support for configuring SmartEEE Marco Felsch
2023-07-10 10:10   ` Ahmad Fatoum
2023-07-10 12:10     ` Oleksij Rempel
2023-07-10  6:36 ` Marco Felsch [this message]
2023-07-10 10:07   ` [PATCH 6/7] net: phy: at803x: add disable hibernation mode support Ahmad Fatoum
2023-07-10 10:53     ` Marco Felsch
2023-07-10 11:07       ` Ahmad Fatoum
2023-07-10  6:36 ` [PATCH 7/7] net: phy: at803x: disable extended next page bit Marco Felsch
2023-07-10 10:03   ` Ahmad Fatoum
2023-07-10  9:55 ` [PATCH 1/7] ARM: boards: make use of MDIO_MMD register defines Ahmad Fatoum

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