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Date: Mon, 12 Feb 2024 14:15:47 +0000
From: POPESCU Catalin <catalin.popescu@...ca-geosystems.com>
To: "davem@...emloft.net" <davem@...emloft.net>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>, "afd@...com" <afd@...com>,
	"andrew@...n.ch" <andrew@...n.ch>, "hkallweit1@...il.com"
	<hkallweit1@...il.com>, "linux@...linux.org.uk" <linux@...linux.org.uk>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	GEO-CHHER-bsp-development <bsp-development.geo@...ca-geosystems.com>,
	"m.felsch@...gutronix.de" <m.felsch@...gutronix.de>
Subject: Re: [PATCH v4 2/2] net: phy: dp83826: support TX data voltage tuning

I just figured out that I forgot to disable WOL in the callback config_init.
It looks the PHY driver should explicitly disable WOL feature at init, 
and leave it to ethtool to be enabled.
I will provide a v5 ASAP to fix that.

On 12.02.24 08:46, Catalin Popescu wrote:
> DP83826 offers the possibility to tune the voltage of logical
> levels of the MLT-3 encoded TX data. This is useful when there
> is a voltage drop in between the PHY and the connector and we
> want to increase the voltage levels to compensate for that drop.
>
> Prior to PHY configuration, the driver SW resets the PHY which has
> the same effect as the HW reset pin according to the datasheet.
> Hence, there's no need to force update the VOD_CFG registers to make
> sure they hold their reset values. VOD_CFG registers need to be
> updated only if the DT has been configured with values other than
> the reset ones.
>
> Signed-off-by: Catalin Popescu <catalin.popescu@...ca-geosystems.com>
> ---
> Changes in v2:
>   - remove raw values mapping tables dp83826_cfg_dac_minus_raw/
>     dp83826_cfg_dac_plus_raw and replace them with functions
>     dp83826_to_dac_minus_one_regval/dp83826_to_dac_plus_one_regval
>   - increase readability of function dp83826_config_init
>   - change return value of function dp83826_of_init from int to void
>     since it never returns any error
>
> Changes in v3:
>   - rename DT properties to "-bp"
>   - rename DP83826_CFG_DAC_MPERCENT_DEFAULT/DP83826_CFG_DAC_MPERCENT_PER_STEP
>     to DP83826_CFG_DAC_PERCENT_DEFAULT/DP83826_CFG_DAC_PERCENT_PER_STEP and
>     update their values to reflect the new unit "basis point"
>   - update commit message with explanation about the registers reset
>     values
>
> Changes in v4:
>   - update commit message to be more meaningful
> ---
>   drivers/net/phy/dp83822.c | 130 ++++++++++++++++++++++++++++++++++++--
>   1 file changed, 126 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c
> index b7cb71817780..30f2616ab1c2 100644
> --- a/drivers/net/phy/dp83822.c
> +++ b/drivers/net/phy/dp83822.c
> @@ -12,6 +12,7 @@
>   #include <linux/of.h>
>   #include <linux/phy.h>
>   #include <linux/netdevice.h>
> +#include <linux/bitfield.h>
>   
>   #define DP83822_PHY_ID	        0x2000a240
>   #define DP83825S_PHY_ID		0x2000a140
> @@ -34,6 +35,10 @@
>   #define MII_DP83822_GENCFG	0x465
>   #define MII_DP83822_SOR1	0x467
>   
> +/* DP83826 specific registers */
> +#define MII_DP83826_VOD_CFG1	0x30b
> +#define MII_DP83826_VOD_CFG2	0x30c
> +
>   /* GENCFG */
>   #define DP83822_SIG_DET_LOW	BIT(0)
>   
> @@ -110,6 +115,19 @@
>   #define DP83822_RX_ER_STR_MASK	GENMASK(9, 8)
>   #define DP83822_RX_ER_SHIFT	8
>   
> +/* DP83826: VOD_CFG1 & VOD_CFG2 */
> +#define DP83826_VOD_CFG1_MINUS_MDIX_MASK	GENMASK(13, 12)
> +#define DP83826_VOD_CFG1_MINUS_MDI_MASK		GENMASK(11, 6)
> +#define DP83826_VOD_CFG2_MINUS_MDIX_MASK	GENMASK(15, 12)
> +#define DP83826_VOD_CFG2_PLUS_MDIX_MASK		GENMASK(11, 6)
> +#define DP83826_VOD_CFG2_PLUS_MDI_MASK		GENMASK(5, 0)
> +#define DP83826_CFG_DAC_MINUS_MDIX_5_TO_4	GENMASK(5, 4)
> +#define DP83826_CFG_DAC_MINUS_MDIX_3_TO_0	GENMASK(3, 0)
> +#define DP83826_CFG_DAC_PERCENT_PER_STEP	625
> +#define DP83826_CFG_DAC_PERCENT_DEFAULT		10000
> +#define DP83826_CFG_DAC_MINUS_DEFAULT		0x30
> +#define DP83826_CFG_DAC_PLUS_DEFAULT		0x10
> +
>   #define MII_DP83822_FIBER_ADVERTISE    (ADVERTISED_TP | ADVERTISED_MII | \
>   					ADVERTISED_FIBRE | \
>   					ADVERTISED_Pause | ADVERTISED_Asym_Pause)
> @@ -118,6 +136,8 @@ struct dp83822_private {
>   	bool fx_signal_det_low;
>   	int fx_enabled;
>   	u16 fx_sd_enable;
> +	u8 cfg_dac_minus;
> +	u8 cfg_dac_plus;
>   };
>   
>   static int dp83822_set_wol(struct phy_device *phydev,
> @@ -233,7 +253,7 @@ static int dp83822_config_intr(struct phy_device *phydev)
>   				DP83822_ENERGY_DET_INT_EN |
>   				DP83822_LINK_QUAL_INT_EN);
>   
> -		/* Private data pointer is NULL on DP83825/26 */
> +		/* Private data pointer is NULL on DP83825 */
>   		if (!dp83822 || !dp83822->fx_enabled)
>   			misr_status |= DP83822_ANEG_COMPLETE_INT_EN |
>   				       DP83822_DUP_MODE_CHANGE_INT_EN |
> @@ -254,7 +274,7 @@ static int dp83822_config_intr(struct phy_device *phydev)
>   				DP83822_PAGE_RX_INT_EN |
>   				DP83822_EEE_ERROR_CHANGE_INT_EN);
>   
> -		/* Private data pointer is NULL on DP83825/26 */
> +		/* Private data pointer is NULL on DP83825 */
>   		if (!dp83822 || !dp83822->fx_enabled)
>   			misr_status |= DP83822_ANEG_ERR_INT_EN |
>   				       DP83822_WOL_PKT_INT_EN;
> @@ -474,6 +494,43 @@ static int dp83822_config_init(struct phy_device *phydev)
>   	return dp8382x_disable_wol(phydev);
>   }
>   
> +static int dp83826_config_init(struct phy_device *phydev)
> +{
> +	struct dp83822_private *dp83822 = phydev->priv;
> +	u16 val, mask;
> +	int ret;
> +
> +	if (dp83822->cfg_dac_minus != DP83826_CFG_DAC_MINUS_DEFAULT) {
> +		val = FIELD_PREP(DP83826_VOD_CFG1_MINUS_MDI_MASK, dp83822->cfg_dac_minus) |
> +		      FIELD_PREP(DP83826_VOD_CFG1_MINUS_MDIX_MASK,
> +				 FIELD_GET(DP83826_CFG_DAC_MINUS_MDIX_5_TO_4,
> +					   dp83822->cfg_dac_minus));
> +		mask = DP83826_VOD_CFG1_MINUS_MDIX_MASK | DP83826_VOD_CFG1_MINUS_MDI_MASK;
> +		ret = phy_modify_mmd(phydev, DP83822_DEVADDR, MII_DP83826_VOD_CFG1, mask, val);
> +		if (ret)
> +			return ret;
> +
> +		val = FIELD_PREP(DP83826_VOD_CFG2_MINUS_MDIX_MASK,
> +				 FIELD_GET(DP83826_CFG_DAC_MINUS_MDIX_3_TO_0,
> +					   dp83822->cfg_dac_minus));
> +		mask = DP83826_VOD_CFG2_MINUS_MDIX_MASK;
> +		ret = phy_modify_mmd(phydev, DP83822_DEVADDR, MII_DP83826_VOD_CFG2, mask, val);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	if (dp83822->cfg_dac_plus != DP83826_CFG_DAC_PLUS_DEFAULT) {
> +		val = FIELD_PREP(DP83826_VOD_CFG2_PLUS_MDIX_MASK, dp83822->cfg_dac_plus) |
> +		      FIELD_PREP(DP83826_VOD_CFG2_PLUS_MDI_MASK, dp83822->cfg_dac_plus);
> +		mask = DP83826_VOD_CFG2_PLUS_MDIX_MASK | DP83826_VOD_CFG2_PLUS_MDI_MASK;
> +		ret = phy_modify_mmd(phydev, DP83822_DEVADDR, MII_DP83826_VOD_CFG2, mask, val);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
>   static int dp8382x_config_init(struct phy_device *phydev)
>   {
>   	return dp8382x_disable_wol(phydev);
> @@ -509,11 +566,44 @@ static int dp83822_of_init(struct phy_device *phydev)
>   
>   	return 0;
>   }
> +
> +static int dp83826_to_dac_minus_one_regval(int percent)
> +{
> +	int tmp = DP83826_CFG_DAC_PERCENT_DEFAULT - percent;
> +
> +	return tmp / DP83826_CFG_DAC_PERCENT_PER_STEP;
> +}
> +
> +static int dp83826_to_dac_plus_one_regval(int percent)
> +{
> +	int tmp = percent - DP83826_CFG_DAC_PERCENT_DEFAULT;
> +
> +	return tmp / DP83826_CFG_DAC_PERCENT_PER_STEP;
> +}
> +
> +static void dp83826_of_init(struct phy_device *phydev)
> +{
> +	struct dp83822_private *dp83822 = phydev->priv;
> +	struct device *dev = &phydev->mdio.dev;
> +	u32 val;
> +
> +	dp83822->cfg_dac_minus = DP83826_CFG_DAC_MINUS_DEFAULT;
> +	if (!device_property_read_u32(dev, "ti,cfg-dac-minus-one-bp", &val))
> +		dp83822->cfg_dac_minus += dp83826_to_dac_minus_one_regval(val);
> +
> +	dp83822->cfg_dac_plus = DP83826_CFG_DAC_PLUS_DEFAULT;
> +	if (!device_property_read_u32(dev, "ti,cfg-dac-plus-one-bp", &val))
> +		dp83822->cfg_dac_plus += dp83826_to_dac_plus_one_regval(val);
> +}
>   #else
>   static int dp83822_of_init(struct phy_device *phydev)
>   {
>   	return 0;
>   }
> +
> +static void dp83826_of_init(struct phy_device *phydev)
> +{
> +}
>   #endif /* CONFIG_OF_MDIO */
>   
>   static int dp83822_read_straps(struct phy_device *phydev)
> @@ -567,6 +657,22 @@ static int dp83822_probe(struct phy_device *phydev)
>   	return 0;
>   }
>   
> +static int dp83826_probe(struct phy_device *phydev)
> +{
> +	struct dp83822_private *dp83822;
> +
> +	dp83822 = devm_kzalloc(&phydev->mdio.dev, sizeof(*dp83822),
> +			       GFP_KERNEL);
> +	if (!dp83822)
> +		return -ENOMEM;
> +
> +	phydev->priv = dp83822;
> +
> +	dp83826_of_init(phydev);
> +
> +	return 0;
> +}
> +
>   static int dp83822_suspend(struct phy_device *phydev)
>   {
>   	int value;
> @@ -610,6 +716,22 @@ static int dp83822_resume(struct phy_device *phydev)
>   		.resume = dp83822_resume,			\
>   	}
>   
> +#define DP83826_PHY_DRIVER(_id, _name)				\
> +	{							\
> +		PHY_ID_MATCH_MODEL(_id),			\
> +		.name		= (_name),			\
> +		/* PHY_BASIC_FEATURES */			\
> +		.probe          = dp83826_probe,		\
> +		.soft_reset	= dp83822_phy_reset,		\
> +		.config_init	= dp83826_config_init,		\
> +		.get_wol = dp83822_get_wol,			\
> +		.set_wol = dp83822_set_wol,			\
> +		.config_intr = dp83822_config_intr,		\
> +		.handle_interrupt = dp83822_handle_interrupt,	\
> +		.suspend = dp83822_suspend,			\
> +		.resume = dp83822_resume,			\
> +	}
> +
>   #define DP8382X_PHY_DRIVER(_id, _name)				\
>   	{							\
>   		PHY_ID_MATCH_MODEL(_id),			\
> @@ -628,8 +750,8 @@ static int dp83822_resume(struct phy_device *phydev)
>   static struct phy_driver dp83822_driver[] = {
>   	DP83822_PHY_DRIVER(DP83822_PHY_ID, "TI DP83822"),
>   	DP8382X_PHY_DRIVER(DP83825I_PHY_ID, "TI DP83825I"),
> -	DP8382X_PHY_DRIVER(DP83826C_PHY_ID, "TI DP83826C"),
> -	DP8382X_PHY_DRIVER(DP83826NC_PHY_ID, "TI DP83826NC"),
> +	DP83826_PHY_DRIVER(DP83826C_PHY_ID, "TI DP83826C"),
> +	DP83826_PHY_DRIVER(DP83826NC_PHY_ID, "TI DP83826NC"),
>   	DP8382X_PHY_DRIVER(DP83825S_PHY_ID, "TI DP83825S"),
>   	DP8382X_PHY_DRIVER(DP83825CM_PHY_ID, "TI DP83825M"),
>   	DP8382X_PHY_DRIVER(DP83825CS_PHY_ID, "TI DP83825CS"),


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