Date:   Tue, 17 Aug 2021 22:27:07 +0800
From:   Jie Luo <luoj@...eaurora.org>
To:     Heiner Kallweit <hkallweit1@...il.com>, andrew@...n.ch,
        linux@...linux.org.uk, davem@...emloft.net, kuba@...nel.org
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        sricharan@...eaurora.org
Subject: Re: [PATCH] net: phy: add qca8081 ethernet phy driver


On 8/16/2021 11:27 PM, Heiner Kallweit wrote:
> On 16.08.2021 13:34, Luo Jie wrote:
>> qca8081 is industry’s lowest cost and power 1-port 2.5G/1G Ethernet PHY
>> chip, which implements SGMII/SGMII+ for interface to SoC.
>>
>> Signed-off-by: Luo Jie <luoj@...eaurora.org>
>> ---
>>   drivers/net/phy/Kconfig   |   6 +
>>   drivers/net/phy/Makefile  |   1 +
>>   drivers/net/phy/qca808x.c | 573 ++++++++++++++++++++++++++++++++++++++
>>   3 files changed, 580 insertions(+)
>>   create mode 100644 drivers/net/phy/qca808x.c
>>
>> diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
>> index c56f703ae998..26cb1c2ffd17 100644
>> --- a/drivers/net/phy/Kconfig
>> +++ b/drivers/net/phy/Kconfig
>> @@ -343,3 +343,9 @@ endif # PHYLIB
>>   config MICREL_KS8995MA
>>   	tristate "Micrel KS8995MA 5-ports 10/100 managed Ethernet switch"
>>   	depends on SPI
>> +
>> +config QCA808X_PHY
>> +	tristate "Qualcomm Atheros QCA808X PHYs"
>> +	depends on REGULATOR
>> +	help
>> +	  Currently supports the QCA8081 model
>> diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
>> index 172bb193ae6a..9ef477d79588 100644
>> --- a/drivers/net/phy/Makefile
>> +++ b/drivers/net/phy/Makefile
>> @@ -84,3 +84,4 @@ obj-$(CONFIG_STE10XP)		+= ste10Xp.o
>>   obj-$(CONFIG_TERANETICS_PHY)	+= teranetics.o
>>   obj-$(CONFIG_VITESSE_PHY)	+= vitesse.o
>>   obj-$(CONFIG_XILINX_GMII2RGMII) += xilinx_gmii2rgmii.o
>> +obj-$(CONFIG_QCA808X_PHY)	+= qca808x.o
>> diff --git a/drivers/net/phy/qca808x.c b/drivers/net/phy/qca808x.c
>> new file mode 100644
>> index 000000000000..6cb8abae8c8f
>> --- /dev/null
>> +++ b/drivers/net/phy/qca808x.c
>> @@ -0,0 +1,573 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Driver for Qualcomm QCA808x PHY
>> + * Author: Luo Jie <luoj@...eaurora.org>
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/etherdevice.h>
>> +#include <linux/phy.h>
>> +#include <linux/bitfield.h>
>> +
>> +#define QCA8081_PHY_ID					0x004DD101
>> +
>> +/* MII special status */
>> +#define QCA808X_PHY_SPEC_STATUS				0x11
>> +#define QCA808X_STATUS_FULL_DUPLEX			BIT(13)
>> +#define QCA808X_STATUS_LINK_PASS			BIT(10)
>> +#define QCA808X_STATUS_SPEED_MASK			GENMASK(9, 7)
>> +#define QCA808X_STATUS_SPEED_100MBS			1
>> +#define QCA808X_STATUS_SPEED_1000MBS			2
>> +#define QCA808X_STATUS_SPEED_2500MBS			4
>> +
>> +/* MII interrupt enable & status */
>> +#define QCA808X_PHY_INTR_MASK				0x12
>> +#define QCA808X_PHY_INTR_STATUS				0x13
>> +#define QCA808X_INTR_ENABLE_FAST_RETRAIN_FAIL		BIT(15)
>> +#define QCA808X_INTR_ENABLE_SPEED_CHANGED		BIT(14)
>> +#define QCA808X_INTR_ENABLE_DUPLEX_CHANGED		BIT(13)
>> +#define QCA808X_INTR_ENABLE_PAGE_RECEIVED		BIT(12)
>> +#define QCA808X_INTR_ENABLE_LINK_FAIL			BIT(11)
>> +#define QCA808X_INTR_ENABLE_LINK_SUCCESS		BIT(10)
>> +#define QCA808X_INTR_ENABLE_POE				BIT(1)
>> +#define QCA808X_INTR_ENABLE_WOL				BIT(0)
>> +
>> +/* MII DBG address & data */
>> +#define QCA808X_PHY_DEBUG_ADDR				0x1d
>> +#define QCA808X_PHY_DEBUG_DATA				0x1e
>> +
>> +/* Conifg seed */
>> +#define QCA808X_PHY_DEBUG_LOCAL_SEED			9
>> +#define QCA808X_MASTER_SLAVE_SEED_ENABLE		BIT(1)
>> +#define QCA808X_MASTER_SLAVE_SEED_CFG			GENMASK(12, 2)
>> +#define QCA808X_MASTER_SLAVE_SEED_RANGE			0x32
>> +
>> +/* ADC threshold */
>> +#define QCA808X_PHY_DEBUG_ADC_THRESHOLD			0x2c80
>> +#define QCA808X_ADC_THRESHOLD_MASK			GENMASK(7, 0)
>> +#define QCA808X_ADC_THRESHOLD_80MV			0
>> +#define QCA808X_ADC_THRESHOLD_100MV			0xf0
>> +#define QCA808X_ADC_THRESHOLD_200MV			0x0f
>> +#define QCA808X_ADC_THRESHOLD_300MV			0xff
>> +
>> +/* PMA control */
>> +#define QCA808X_PHY_MMD1_PMA_CONTROL			0x0
>> +#define QCA808X_PMA_CONTROL_SPEED_MASK			(BIT(13) | BIT(6))
>> +#define QCA808X_PMA_CONTROL_2500M			(BIT(13) | BIT(6))
>> +#define QCA808X_PMA_CONTROL_1000M			BIT(6)
>> +#define QCA808X_PMA_CONTROL_100M			BIT(13)
>> +#define QCA808X_PMA_CONTROL_10M				0x0
>> +
>> +/* PMA capable */
>> +#define QCA808X_PHY_MMD1_PMA_CAP_REG			0x4
>> +#define QCA808X_STATUS_2500T_FD_CAPS			BIT(13)
>> +
>> +/* PMA type */
>> +#define QCA808X_PHY_MMD1_PMA_TYPE			0x7
>> +#define QCA808X_PMA_TYPE_MASK				GENMASK(5, 0)
>> +#define QCA808X_PMA_TYPE_2500M				0x30
>> +#define QCA808X_PMA_TYPE_1000M				0xc
>> +#define QCA808X_PMA_TYPE_100M				0xe
>> +#define QCA808X_PMA_TYPE_10M				0xf
>> +
>> +/* CLD control */
>> +#define QCA808X_PHY_MMD3_ADDR_CLD_CTRL7			0x8007
>> +#define QCA808X_8023AZ_AFE_CTRL_MASK			GENMASK(8, 4)
>> +#define QCA808X_8023AZ_AFE_EN				0x90
>> +
>> +/* AZ control */
>> +#define QCA808X_PHY_MMD3_AZ_TRAINING_CTRL		0x8008
>> +#define QCA808X_MMD3_AZ_TRAINING_VAL			0x1c32
>> +
>> +/* WOL control */
>> +#define QCA808X_PHY_MMD3_WOL_CTRL			0x8012
>> +#define QCA808X_WOL_EN					BIT(5)
>> +
>> +#define QCA808X_PHY_MMD3_LOCAL_MAC_ADDR_0_15_OFFSET	0x804c
>> +#define QCA808X_PHY_MMD3_LOCAL_MAC_ADDR_16_31_OFFSET	0x804b
>> +#define QCA808X_PHY_MMD3_LOCAL_MAC_ADDR_32_47_OFFSET	0x804a
>> +
>> +/* AN 2.5G */
>> +#define QCA808X_PHY_MMD7_AUTONEGOTIATION_CONTROL	0x20
>> +#define QCA808X_ADVERTISE_2500FULL			BIT(7)
>> +#define QCA808X_FAST_RETRAIN_2500BT			BIT(5)
>> +#define QCA808X_ADV_LOOP_TIMING				BIT(0)
>> +
>> +/* Fast retrain related registers */
>> +#define QCA808X_PHY_MMD1_FAST_RETRAIN_STATUS_CTL	0x93
>> +#define QCA808X_FAST_RETRAIN_CTRL			0x1
>> +
>> +#define QCA808X_PHY_MMD1_MSE_THRESHOLD_20DB		0x8014
>> +#define QCA808X_MSE_THRESHOLD_20DB_VALUE		0x529
>> +
>> +#define QCA808X_PHY_MMD1_MSE_THRESHOLD_17DB		0x800E
>> +#define QCA808X_MSE_THRESHOLD_17DB_VALUE		0x341
>> +
>> +#define QCA808X_PHY_MMD1_MSE_THRESHOLD_27DB		0x801E
>> +#define QCA808X_MSE_THRESHOLD_27DB_VALUE		0x419
>> +
>> +#define QCA808X_PHY_MMD1_MSE_THRESHOLD_28DB		0x8020
>> +#define QCA808X_MSE_THRESHOLD_28DB_VALUE		0x341
>> +
>> +#define QCA808X_PHY_MMD7_TOP_OPTION1			0x901c
>> +#define QCA808X_TOP_OPTION1_DATA			0x0
>> +
>> +#define QCA808X_PHY_MMD7_ADDR_EEE_LP_ADVERTISEMENT	0x40
>> +#define QCA808X_EEE_ADV_THP				0x8
>> +
>> +#define QCA808X_PHY_MMD3_DEBUG_1			0xa100
>> +#define QCA808X_MMD3_DEBUG_1_VALUE			0x9203
>> +#define QCA808X_PHY_MMD3_DEBUG_2			0xa101
>> +#define QCA808X_MMD3_DEBUG_2_VALUE			0x48ad
>> +#define QCA808X_PHY_MMD3_DEBUG_3			0xa103
>> +#define QCA808X_MMD3_DEBUG_3_VALUE			0x1698
>> +#define QCA808X_PHY_MMD3_DEBUG_4			0xa105
>> +#define QCA808X_MMD3_DEBUG_4_VALUE			0x8001
>> +#define QCA808X_PHY_MMD3_DEBUG_5			0xa106
>> +#define QCA808X_MMD3_DEBUG_5_VALUE			0x1111
>> +#define QCA808X_PHY_MMD3_DEBUG_6			0xa011
>> +#define QCA808X_MMD3_DEBUG_6_VALUE			0x5f85
>> +
>> +static int qca808x_debug_reg_read(struct phy_device *phydev, u16 reg)
>> +{
>> +	int ret;
>> +
>> +	ret = phy_write(phydev, QCA808X_PHY_DEBUG_ADDR, reg);
>> +	if (ret)
>> +		return ret;
>> +
>> +	return phy_read(phydev, QCA808X_PHY_DEBUG_DATA);
>> +}
>> +
>> +static int qca808x_debug_reg_modify(struct phy_device *phydev, u16 reg,
>> +				 u16 mask, u16 val)
>> +{
>> +	u16 phy_data;
>> +	int ret;
>> +
>> +	ret = qca808x_debug_reg_read(phydev, reg);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	phy_data = ret & 0xffff;
>> +	phy_data &= ~mask;
>> +	phy_data |= val;
>> +
>> +	return phy_write(phydev, QCA808X_PHY_DEBUG_DATA, phy_data);
>> +}
>> +
>> +static int qca808x_get_2500caps(struct phy_device *phydev)
>> +{
>> +	int phy_data;
>> +
>> +	phy_data = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, QCA808X_PHY_MMD1_PMA_CAP_REG);
>> +
>> +	return (phy_data & QCA808X_STATUS_2500T_FD_CAPS) ? 1 : 0;
>> +}
>> +
>> +static int qca808x_get_features(struct phy_device *phydev)
>> +{
>> +	linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, phydev->supported,
>> +			qca808x_get_2500caps(phydev));
>> +
>> +	return genphy_read_abilities(phydev);
>> +}
>> +
>> +static int qca808x_phy_fast_retrain_cfg(struct phy_device *phydev)
>> +{
>> +	int ret;
>> +
>> +	ret = phy_write_mmd(phydev, MDIO_MMD_AN, QCA808X_PHY_MMD7_AUTONEGOTIATION_CONTROL,
>> +			QCA808X_ADVERTISE_2500FULL |
>> +			QCA808X_FAST_RETRAIN_2500BT |
>> +			QCA808X_ADV_LOOP_TIMING);
>> +	if (ret)
>> +		return ret;
>> +
>> +	phy_write_mmd(phydev, MDIO_MMD_PMAPMD, QCA808X_PHY_MMD1_FAST_RETRAIN_STATUS_CTL,
>> +			QCA808X_FAST_RETRAIN_CTRL);
>> +	phy_write_mmd(phydev, MDIO_MMD_PMAPMD, QCA808X_PHY_MMD1_MSE_THRESHOLD_20DB,
>> +			QCA808X_MSE_THRESHOLD_20DB_VALUE);
>> +	phy_write_mmd(phydev, MDIO_MMD_PMAPMD, QCA808X_PHY_MMD1_MSE_THRESHOLD_17DB,
>> +			QCA808X_MSE_THRESHOLD_17DB_VALUE);
>> +	phy_write_mmd(phydev, MDIO_MMD_PMAPMD, QCA808X_PHY_MMD1_MSE_THRESHOLD_27DB,
>> +			QCA808X_MSE_THRESHOLD_27DB_VALUE);
>> +	phy_write_mmd(phydev, MDIO_MMD_PMAPMD, QCA808X_PHY_MMD1_MSE_THRESHOLD_28DB,
>> +			QCA808X_MSE_THRESHOLD_28DB_VALUE);
>> +	phy_write_mmd(phydev, MDIO_MMD_AN, QCA808X_PHY_MMD7_ADDR_EEE_LP_ADVERTISEMENT,
>> +			QCA808X_EEE_ADV_THP);
>> +	phy_write_mmd(phydev, MDIO_MMD_AN, QCA808X_PHY_MMD7_TOP_OPTION1,
>> +			QCA808X_TOP_OPTION1_DATA);
>> +	phy_write_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_DEBUG_1,
>> +			QCA808X_MMD3_DEBUG_1_VALUE);
>> +	phy_write_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_DEBUG_4,
>> +			QCA808X_MMD3_DEBUG_4_VALUE);
>> +	phy_write_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_DEBUG_5,
>> +			QCA808X_MMD3_DEBUG_5_VALUE);
>> +	phy_write_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_DEBUG_3,
>> +			QCA808X_MMD3_DEBUG_3_VALUE);
>> +	phy_write_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_DEBUG_6,
>> +			QCA808X_MMD3_DEBUG_6_VALUE);
>> +	phy_write_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_DEBUG_2,
>> +			QCA808X_MMD3_DEBUG_2_VALUE);
>> +
>> +	return 0;
>> +}
>> +
>> +static int qca808x_phy_ms_random_seed_set(struct phy_device *phydev)
>> +{
>> +	u16 seed_value = (prandom_u32() % QCA808X_MASTER_SLAVE_SEED_RANGE) << 2;
>> +
>> +	return qca808x_debug_reg_modify(phydev, QCA808X_PHY_DEBUG_LOCAL_SEED,
>> +			QCA808X_MASTER_SLAVE_SEED_CFG, seed_value);
>> +}
>> +
>> +static int qca808x_phy_ms_seed_enable(struct phy_device *phydev, bool enable)
>> +{
>> +	u16 seed_enable = 0;
>> +
>> +	if (enable)
>> +		seed_enable = QCA808X_MASTER_SLAVE_SEED_ENABLE;
>> +
>> +	return qca808x_debug_reg_modify(phydev, QCA808X_PHY_DEBUG_LOCAL_SEED,
>> +			QCA808X_MASTER_SLAVE_SEED_ENABLE, seed_enable);
>> +}
>> +
>> +static int qca808x_config_init(struct phy_device *phydev)
>> +{
>> +	int ret;
>> +
>> +	/* Active adc&vga on 802.3az for the link 1000M and 100M */
>> +	ret = phy_modify_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_ADDR_CLD_CTRL7,
>> +			QCA808X_8023AZ_AFE_CTRL_MASK, QCA808X_8023AZ_AFE_EN);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* Adjust the threshold on 802.3az for the link 1000M */
>> +	ret = phy_write_mmd(phydev, MDIO_MMD_PCS,
>> +			QCA808X_PHY_MMD3_AZ_TRAINING_CTRL, QCA808X_MMD3_AZ_TRAINING_VAL);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* Config the fast retrain for the link 2500M */
>> +	ret = qca808x_phy_fast_retrain_cfg(phydev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* Configure ramdom seed to make phy linked as slave mode for link 2500M */
>> +	ret = qca808x_phy_ms_random_seed_set(phydev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* Enable seed */
>> +	ret = qca808x_phy_ms_seed_enable(phydev, true);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* Configure adc threshold as 100mv for the link 10M */
>> +	return qca808x_debug_reg_modify(phydev, QCA808X_PHY_DEBUG_ADC_THRESHOLD,
>> +			QCA808X_ADC_THRESHOLD_MASK, QCA808X_ADC_THRESHOLD_100MV);
>> +}
>> +
>> +static int qca808x_ack_interrupt(struct phy_device *phydev)
>> +{
>> +	int ret;
>> +
>> +	ret = phy_read(phydev, QCA808X_PHY_INTR_STATUS);
>> +
>> +	return (ret < 0) ? ret : 0;
>> +}
>> +
>> +static int qca808x_config_intr(struct phy_device *phydev)
>> +{
>> +	int ret;
>> +	int intr_ctl = 0;
>> +
>> +	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
>> +		ret = qca808x_ack_interrupt(phydev);
>> +		if (ret)
>> +			return ret;
>> +
>> +		intr_ctl = phy_read(phydev, QCA808X_PHY_INTR_MASK);
>> +		if (intr_ctl < 0)
>> +			return intr_ctl;
>> +
>> +		intr_ctl |= QCA808X_INTR_ENABLE_FAST_RETRAIN_FAIL |
>> +			QCA808X_INTR_ENABLE_SPEED_CHANGED |
>> +			QCA808X_INTR_ENABLE_DUPLEX_CHANGED |
>> +			QCA808X_INTR_ENABLE_LINK_FAIL |
>> +			QCA808X_INTR_ENABLE_LINK_SUCCESS;
> Do you actually need all these interrupt sources? Your interrupt handler
> does standard link change handling only.

Hi Heiner,

Thanks for the comments, will check and update it in the next patch.

>
>> +		ret = phy_write(phydev, QCA808X_PHY_INTR_MASK, intr_ctl);
>> +	} else {
>> +		ret = phy_write(phydev, QCA808X_PHY_INTR_MASK, intr_ctl);
>> +		if (ret)
>> +			return ret;
>> +
>> +		ret = qca808x_ack_interrupt(phydev);
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static irqreturn_t qca808x_handle_interrupt(struct phy_device *phydev)
>> +{
>> +	int intr_status, intr_mask;
>> +
>> +	intr_status = phy_read(phydev, QCA808X_PHY_INTR_STATUS);
>> +	if (intr_status < 0) {
>> +		phy_error(phydev);
>> +		return IRQ_NONE;
>> +	}
>> +
>> +	intr_mask = phy_read(phydev, QCA808X_PHY_INTR_MASK);
>> +	if (intr_mask < 0) {
>> +		phy_error(phydev);
>> +		return IRQ_NONE;
>> +	}
>> +
>> +	if (!(intr_status & intr_mask))
>> +		return IRQ_NONE;
>> +
>> +	phy_start_machine(phydev);
>> +
> phy_mac_interrupt() is the correct call here, even though it does the
> same as phy_start_machine().
Thanks for the comments, will update to use phy_mac_interrupt() in next 
patch.
>
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static int qca808x_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
>> +{
>> +	struct net_device *ndev = phydev->attached_dev;
>> +	const u8 *mac;
>> +	int ret;
>> +	unsigned int i, offsets[] = {
> offsets[] should be static const.
>
>> +		QCA808X_PHY_MMD3_LOCAL_MAC_ADDR_32_47_OFFSET,
>> +		QCA808X_PHY_MMD3_LOCAL_MAC_ADDR_16_31_OFFSET,
>> +		QCA808X_PHY_MMD3_LOCAL_MAC_ADDR_0_15_OFFSET,
>> +	};
>> +
>> +	if (!ndev)
>> +		return -ENODEV;
>> +
>> +	if (wol->wolopts & WAKE_MAGIC) {
>> +		mac = (const u8 *) ndev->dev_addr;
>> +		if (!is_valid_ether_addr(mac))
>> +			return -EINVAL;
>> +
>> +		for (i = 0; i < 3; i++)
> ARRAY_SIZE(offsets) would be better than a magic number. And in general:
> Instead of the loop, wouldn't it be simpler and better readable to write:
>
> phy_write_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_LOCAL_MAC_ADDR_32_47_OFFSET, mac[1] | (mac[0] < 8));
> phy_write_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_LOCAL_MAC_ADDR_16_31_OFFSET, mac[3] | (mac[2] < 8));
> phy_write_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_LOCAL_MAC_ADDR_0_15_OFFSET, mac[5] | (mac[4] < 8));
thanks for the suggestion, will update to take this in the next patch.
>
>> +			phy_write_mmd(phydev, MDIO_MMD_PCS, offsets[i],
>> +				      mac[(i * 2) + 1] | (mac[(i * 2)] << 8));
>> +
>> +		/* clear the pending wol interrupt */
>> +		phy_read(phydev, QCA808X_PHY_INTR_STATUS);
>> +
>> +		ret = phy_modify(phydev, QCA808X_PHY_INTR_MASK, 0, QCA808X_INTR_ENABLE_WOL);
>> +		if (ret)
>> +			return ret;
>> +
>> +		ret = phy_modify_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_WOL_CTRL,
>> +				0, QCA808X_WOL_EN);
>> +	} else {
>> +		ret = phy_modify(phydev, QCA808X_PHY_INTR_MASK, QCA808X_INTR_ENABLE_WOL, 0);
>> +		if (ret)
>> +			return ret;
>> +
>> +		ret = phy_modify_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_WOL_CTRL,
>> +				QCA808X_WOL_EN, 0);
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static void qca808x_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol)
>> +{
>> +	int ret;
>> +
>> +	wol->supported = WAKE_MAGIC;
>> +	wol->wolopts = 0;
>> +
>> +	ret = phy_read_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_WOL_CTRL);
>> +	if (ret < 0)
>> +		return;
>> +
>> +	if (ret & QCA808X_WOL_EN)
>> +		wol->wolopts |= WAKE_MAGIC;
>> +}
>> +
>> +static int qca808x_suspend(struct phy_device *phydev)
>> +{
>> +	int ret;
>> +
>> +	ret = phy_read_mmd(phydev, MDIO_MMD_PCS, QCA808X_PHY_MMD3_WOL_CTRL);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	if (ret & QCA808X_WOL_EN)
>> +		return 0;
> This isn't needed, phy_suspend() checks for WoL being enabled.
will update to use phy_suspend() in next patch, thanks for this comment.
>
>> +
>> +	return genphy_suspend(phydev);
>> +}
>> +
>> +static int qca808x_speed_forced(struct phy_device *phydev)
>> +{
>> +	u16 speed_ctrl, type_ctrl;
>> +	int ret;
>> +
>> +	switch (phydev->speed) {
>> +	case SPEED_2500:
>> +		speed_ctrl = QCA808X_PMA_CONTROL_2500M;
>> +		type_ctrl = QCA808X_PMA_TYPE_2500M;
>> +		break;
>> +	case SPEED_1000:
>> +		speed_ctrl = QCA808X_PMA_CONTROL_1000M;
>> +		type_ctrl = QCA808X_PMA_TYPE_1000M;
>> +		break;
>> +	case SPEED_100:
>> +		speed_ctrl = QCA808X_PMA_CONTROL_100M;
>> +		type_ctrl = QCA808X_PMA_TYPE_100M;
>> +		break;
>> +	default:
>> +		speed_ctrl = QCA808X_PMA_CONTROL_10M;
>> +		type_ctrl = QCA808X_PMA_TYPE_10M;
>> +		break;
>> +	}
>> +
>> +	ret = phy_modify_mmd(phydev, MDIO_MMD_PMAPMD, QCA808X_PHY_MMD1_PMA_CONTROL,
>> +			QCA808X_PMA_CONTROL_SPEED_MASK, speed_ctrl);
>> +	if (ret)
>> +		return ret;
>> +
>> +	return phy_modify_mmd(phydev, MDIO_MMD_PMAPMD, QCA808X_PHY_MMD1_PMA_TYPE,
>> +			QCA808X_PMA_TYPE_MASK, type_ctrl);
>> +}
>> +
>> +static int qca808x_config_aneg(struct phy_device *phydev)
>> +{
>> +	int phy_ctrl = 0;
>> +	int ret = 0;
>> +
>> +	if (phydev->autoneg != AUTONEG_ENABLE) {
>> +		ret = genphy_setup_forced(phydev);
>> +		if (ret)
>> +			return ret;
>> +
>> +		ret = qca808x_speed_forced(phydev);
>> +	} else {
>> +		ret = __genphy_config_aneg(phydev, ret);
>> +		if (ret)
>> +			return ret;
>> +
>> +		if (linkmode_test_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, phydev->advertising))
>> +			phy_ctrl = QCA808X_ADVERTISE_2500FULL;
>> +
>> +		ret = phy_modify_mmd(phydev, MDIO_MMD_AN, QCA808X_PHY_MMD7_AUTONEGOTIATION_CONTROL,
>> +				QCA808X_ADVERTISE_2500FULL, phy_ctrl);
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static int qca808x_get_speed(struct phy_device *phydev)
>> +{
>> +	int ret = phy_read(phydev, QCA808X_PHY_SPEC_STATUS);
>> +
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	switch (FIELD_GET(QCA808X_STATUS_SPEED_MASK, ret)) {
>> +	case QCA808X_STATUS_SPEED_2500MBS:
>> +		phydev->speed = SPEED_2500;
>> +		break;
>> +	case QCA808X_STATUS_SPEED_1000MBS:
>> +		phydev->speed = SPEED_1000;
>> +		break;
>> +	case QCA808X_STATUS_SPEED_100MBS:
>> +		phydev->speed = SPEED_100;
>> +		break;
>> +	default:
>> +		phydev->speed = SPEED_10;
>> +		break;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int qca808x_read_status(struct phy_device *phydev)
>> +{
>> +	int ret;
>> +
>> +	ret = genphy_read_status(phydev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	if (!phydev->link) {
> Why is all the following needed in read_status() if link is down?
> When using polling mode then this would be executed with each poll
> if link is down.

Hi Heiner,

thanks for the review comments, will move the 
ETHTOOL_LINK_MODE_2500baseT_Full_BIT out of

the condition if link is down.

About the master/slave configuration, the PHY need to configure a 
different lower SEED value to

make PHY linked as the SLAVE mode to fix some IOT issue that leads to 
the link down.

if there is a master/slave configuration fault detected, then disable 
the SEED config.

>> +		ret = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_STAT);
>> +		if (ret < 0)
>> +			return ret;
>> +
>> +		linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, phydev->lp_advertising,
>> +				ret & MDIO_AN_10GBT_STAT_LP2_5G);
>> +
>> +		/* generate random seed as a lower value to make PHY linked as SLAVE easily,
>> +		 * excpet for master/slave configuration fault detected.
>> +		 */
>> +		if (qca808x_get_2500caps(phydev) == 1) {
>> +			ret = phy_read(phydev, MII_STAT1000);
>> +			if (ret < 0)
>> +				return ret;
>> +
>> +			if (ret & LPA_1000MSFAIL) {
>> +				qca808x_phy_ms_seed_enable(phydev, false);
>> +			} else {
>> +				qca808x_phy_ms_random_seed_set(phydev);
>> +				qca808x_phy_ms_seed_enable(phydev, true);
>> +			}
>> +		}
>> +	}
>> +
>> +	return qca808x_get_speed(phydev);
>> +}
>> +
>> +static int qca808x_soft_reset(struct phy_device *phydev)
>> +{
>> +	int ret;
>> +
>> +	ret = genphy_soft_reset(phydev);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	if (phydev->autoneg == AUTONEG_DISABLE) {
> Isn't this what genphy_soft_reset() does anyway?
Thanks Heiner for the comments, genphy_soft_reset does not support 2.5G, 
the qca8081 may need to force 2.5G here.
>
>> +		ret = qca808x_speed_forced(phydev);
>> +		if (ret)
>> +			return ret;
>> +	}
>> +
>> +	return qca808x_phy_ms_seed_enable(phydev, true);
>> +}
>> +
>> +static struct phy_driver qca808x_phy_driver[] = {
>> +	{
>> +		PHY_ID_MATCH_EXACT(QCA8081_PHY_ID),
>> +		.name			= "QCA8081 PHY",
>> +		.get_features		= qca808x_get_features,
>> +		.config_init		= qca808x_config_init,
>> +		.read_status		= qca808x_read_status,
>> +		.soft_reset		= qca808x_soft_reset,
>> +		.config_intr		= qca808x_config_intr,
>> +		.handle_interrupt	= qca808x_handle_interrupt,
>> +		.config_aneg		= qca808x_config_aneg,
>> +		.set_wol		= qca808x_set_wol,
>> +		.get_wol		= qca808x_get_wol,
>> +		.suspend		= qca808x_suspend,
>> +		.resume			= genphy_resume,
>> +	},
>> +};
>> +module_phy_driver(qca808x_phy_driver);
>> +
>> +static struct mdio_device_id __maybe_unused qca808x_phy_tbl[] = {
>> +	{ PHY_ID_MATCH_EXACT(QCA8081_PHY_ID) },
>> +	{ },
>> +};
>> +MODULE_DEVICE_TABLE(mdio, qca808x_phy_tbl);
>> +
>> +MODULE_DESCRIPTION("Qualcomm Technologies, Inc. QCA8081 PHY driver");
>> +MODULE_AUTHOR("Luo Jie");
>> +MODULE_LICENSE("GPL");
>>

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