linux-kernel - Re: [PATCH v2 4/7] net: phy: realtek: Enable accessing RTL8211E extension pages

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Date:   Wed, 3 Jul 2019 22:12:12 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Matthias Kaehlcke <mka@...omium.org>,
        "David S . Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH v2 4/7] net: phy: realtek: Enable accessing RTL8211E
 extension pages

On 03.07.2019 21:37, Matthias Kaehlcke wrote:
> The RTL8211E has extension pages, which can be accessed after
> selecting a page through a custom method. Add a function to
> modify bits in a register of an extension page and a helper for
> selecting an ext page.
> 
> rtl8211e_modify_ext_paged() is inspired by its counterpart
> phy_modify_paged().
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> Changes in v2:
> - assign .read/write_page handlers for RTL8211E

Maybe this was planned, but it's not part of the patch.

> - use phy_select_page() and phy_restore_page(), get rid of
>   rtl8211e_restore_page()
> - s/rtl821e_select_ext_page/rtl8211e_select_ext_page/
> - updated commit message
> ---
>  drivers/net/phy/realtek.c | 42 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 42 insertions(+)
> 
> diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
> index eb815cbe1e72..9cd6241e2a6d 100644
> --- a/drivers/net/phy/realtek.c
> +++ b/drivers/net/phy/realtek.c
> @@ -27,6 +27,9 @@
>  #define RTL821x_EXT_PAGE_SELECT			0x1e
>  #define RTL821x_PAGE_SELECT			0x1f
>  
> +#define RTL8211E_EXT_PAGE			7
> +#define RTL8211E_EPAGSR				0x1e
> +
>  /* RTL8211E page 5 */
>  #define RTL8211E_EEE_LED_MODE1			0x05
>  #define RTL8211E_EEE_LED_MODE2			0x06
> @@ -58,6 +61,44 @@ static int rtl821x_write_page(struct phy_device *phydev, int page)
>  	return __phy_write(phydev, RTL821x_PAGE_SELECT, page);
>  }
>  
> +static int rtl8211e_select_ext_page(struct phy_device *phydev, int page)
> +{
> +	int ret, oldpage;
> +
> +	oldpage = phy_select_page(phydev, RTL8211E_EXT_PAGE);
> +	if (oldpage < 0)
> +		return oldpage;
> +
> +	ret = __phy_write(phydev, RTL8211E_EPAGSR, page);
> +	if (ret)
> +		return phy_restore_page(phydev, page, ret);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused rtl8211e_modify_ext_paged(struct phy_device *phydev,
> +				    int page, u32 regnum, u16 mask, u16 set)

This __maybe_unused isn't too nice as you use the function in a subsequent patch.

> +{
> +	int ret = 0;
> +	int oldpage;
> +	int new;
> +
> +	oldpage = rtl8211e_select_ext_page(phydev, page);
> +	if (oldpage < 0)
> +		goto out;
> +
> +	ret = __phy_read(phydev, regnum);
> +	if (ret < 0)
> +		goto out;
> +
> +	new = (ret & ~mask) | set;
> +	if (new != ret)
> +		ret = __phy_write(phydev, regnum, new);
> +
> +out:
> +	return phy_restore_page(phydev, oldpage, ret);
> +}
> +
>  static int rtl8211e_disable_eee_led_mode(struct phy_device *phydev)
>  {
>  	int ret = 0;
> @@ -87,6 +128,7 @@ static int rtl8211e_config_init(struct phy_device *phydev)
>  
>  	return 0;
>  }
> +
>  static int rtl8201_ack_interrupt(struct phy_device *phydev)
>  {
>  	int err;
>