Subject: Re: [PATCH v6 4/4] net: phy: realtek: Add LED configuration support for RTL8211E

From: Pavel Machek <[email-masked]>
Date: Fri, 16 Aug 2019 22:13:42 +0200

On Tue 2019-08-13 12:11:47, Matthias Kaehlcke wrote:
> Add a .config_led hook which is called by the PHY core when
> configuration data for a PHY LED is available. Each LED can be
> configured to be solid 'off, solid 'on' for certain (or all)
> link speeds or to blink on RX/TX activity.
> 
> Signed-off-by: Matthias Kaehlcke <[email-masked]>

THis really needs to go through the LED subsystem, and use the same userland
interfaces as the rest of the system.

Sorry.

NAK.

									Pavel

> ---
> Changes in v6:
> - return -EOPNOTSUPP if trigger is not supported, don't log warning
> - don't log errors if MDIO ops fail, this is rare and the phy_device
>   will log a warning
> - added parentheses around macro argument used in arithmetics to
>   avoid possible operator precedence issues
> - minor formatting changes
> 
> Changes in v5:
> - use 'config_leds' driver callback instead of requesting the DT
>   configuration
> - added support for trigger 'none'
> - always disable EEE LED mode when a LED is configured. We have no
>   device data struct to keep track of its state, the number of LEDs
>   is limited, so the overhead of disabling it multiple times (once for
>   each LED that is configured) during initialization is negligible
> - print warning when disabling EEE LED mode fails
> - updated commit message (previous subject was 'net: phy: realtek:
>   configure RTL8211E LEDs')
> 
> Changes in v4:
> - use the generic PHY LED binding
> - keep default/current configuration if none is specified
> - added rtl8211e_disable_eee_led_mode()
>   - was previously in separate patch, however since we always want to
>     disable EEE LED mode when a LED configuration is specified it makes
>     sense to just add the function here.
> - don't call phy_restore_page() in rtl8211e_config_leds() if
>   selection of the extended page failed.
> - use phydev_warn() instead of phydev_err() if LED configuration
>   fails since we don't bail out
> - use hex number to specify page for consistency
> - add hex number to comment about ext page 44 to facilitate searching
> 
> Changes in v3:
> - sanity check led-modes values
> - set LACR bits in a more readable way
> - use phydev_err() instead of dev_err()
> - log an error if LED configuration fails
> 
> Changes in v2:
> - patch added to the series
> ---
>  drivers/net/phy/realtek.c | 90 ++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 89 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
> index a5b3708dc4d8..2bca3b91d43d 100644
> --- a/drivers/net/phy/realtek.c
> +++ b/drivers/net/phy/realtek.c
> @@ -9,8 +9,9 @@
>   * Copyright (c) 2004 Freescale Semiconductor, Inc.
>   */
>  #include <linux/bitops.h>
> -#include <linux/phy.h>
> +#include <linux/bits.h>
>  #include <linux/module.h>
> +#include <linux/phy.h>
>  
>  #define RTL821x_PHYSR				0x11
>  #define RTL821x_PHYSR_DUPLEX			BIT(13)
> @@ -26,6 +27,19 @@
>  #define RTL821x_EXT_PAGE_SELECT			0x1e
>  #define RTL821x_PAGE_SELECT			0x1f
>  
> +/* RTL8211E page 5 */
> +#define RTL8211E_EEE_LED_MODE1			0x05
> +#define RTL8211E_EEE_LED_MODE2			0x06
> +
> +/* RTL8211E extension page 44 (0x2c) */
> +#define RTL8211E_LACR				0x1a
> +#define RLT8211E_LACR_LEDACTCTRL_SHIFT		4
> +#define RTL8211E_LCR				0x1c
> +
> +#define LACR_MASK(led)				BIT(4 + (led))
> +#define LCR_MASK(led)				GENMASK(((led) * 4) + 2,\
> +							(led) * 4)
> +
>  #define RTL8211F_INSR				0x1d
>  
>  #define RTL8211F_TX_DELAY			BIT(8)
> @@ -83,6 +97,79 @@ static int rtl8211x_modify_ext_paged(struct phy_device *phydev, int page,
>  	return phy_restore_page(phydev, oldpage, ret);
>  }
>  
> +static void rtl8211e_disable_eee_led_mode(struct phy_device *phydev)
> +{
> +	int oldpage;
> +	int err = 0;
> +
> +	oldpage = phy_select_page(phydev, 5);
> +	if (oldpage < 0)
> +		goto out;
> +
> +	/* write magic values to disable EEE LED mode */
> +	err = __phy_write(phydev, RTL8211E_EEE_LED_MODE1, 0x8b82);
> +	if (err)
> +		goto out;
> +
> +	err = __phy_write(phydev, RTL8211E_EEE_LED_MODE2, 0x052b);
> +
> +out:
> +	if (err)
> +		phydev_warn(phydev, "failed to disable EEE LED mode: %d\n",
> +			    err);
> +
> +	phy_restore_page(phydev, oldpage, err);
> +}
> +
> +static int rtl8211e_config_led(struct phy_device *phydev, int led,
> +			       struct phy_led_config *cfg)
> +{
> +	u16 lacr_bits = 0, lcr_bits = 0;
> +	int oldpage, ret;
> +
> +	switch (cfg->trigger.t) {
> +	case PHY_LED_TRIGGER_LINK:
> +		lcr_bits = 7 << (led * 4);
> +		break;
> +
> +	case PHY_LED_TRIGGER_LINK_10M:
> +		lcr_bits = 1 << (led * 4);
> +		break;
> +
> +	case PHY_LED_TRIGGER_LINK_100M:
> +		lcr_bits = 2 << (led * 4);
> +		break;
> +
> +	case PHY_LED_TRIGGER_LINK_1G:
> +		lcr_bits |= 4 << (led * 4);
> +		break;
> +
> +	case PHY_LED_TRIGGER_NONE:
> +		break;
> +
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +
> +	if (cfg->trigger.activity)
> +		lacr_bits = BIT(RLT8211E_LACR_LEDACTCTRL_SHIFT + led);
> +
> +	rtl8211e_disable_eee_led_mode(phydev);
> +
> +	oldpage = rtl8211x_select_ext_page(phydev, 0x2c);
> +	if (oldpage < 0)
> +		return oldpage;
> +
> +	ret = __phy_modify(phydev, RTL8211E_LACR, LACR_MASK(led), lacr_bits);
> +	if (ret)
> +		goto err;
> +
> +	ret = __phy_modify(phydev, RTL8211E_LCR, LCR_MASK(led), lcr_bits);
> +
> +err:
> +	return phy_restore_page(phydev, oldpage, ret);
> +}
> +
>  static int rtl8201_ack_interrupt(struct phy_device *phydev)
>  {
>  	int err;
> @@ -330,6 +417,7 @@ static struct phy_driver realtek_drvs[] = {
>  		.config_init	= &rtl8211e_config_init,
>  		.ack_interrupt	= &rtl821x_ack_interrupt,
>  		.config_intr	= &rtl8211e_config_intr,
> +		.config_led	= &rtl8211e_config_led,
>  		.suspend	= genphy_suspend,
>  		.resume		= genphy_resume,
>  		.read_page	= rtl821x_read_page,
> -- 
> 2.23.0.rc1.153.gdeed80330f-goog

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