RE: [PATCH net-next 3/4] net: phy: realteck: add dt property to disable ALDPS mode
From: Joakim Zhang <hidden>
Date: 2021-06-02 02:23:02
Also in:
lkml, netdev
Hi Russell,
-----Original Message----- From: Russell King <linux@armlinux.org.uk> Sent: 2021年6月1日 19:52 To: Joakim Zhang <redacted> Cc: davem@davemloft.net; kuba@kernel.org; robh+dt@kernel.org; andrew@lunn.ch; hkallweit1@gmail.com; f.fainelli@gmail.com; dl-linux-imx [off-list ref]; netdev@vger.kernel.org; devicetree@vger.kernel.org; linux-kernel@vger.kernel.org Subject: Re: [PATCH net-next 3/4] net: phy: realteck: add dt property to disable ALDPS mode On Tue, Jun 01, 2021 at 05:04:07PM +0800, Joakim Zhang wrote:quoted
@@ -325,8 +329,10 @@ static int rtl8211f_config_init(struct phy_device*phydev)quoted
u16 val; int ret; - val = RTL8211F_ALDPS_ENABLE | RTL8211F_ALDPS_PLL_OFF |RTL8211F_ALDPS_XTAL_OFF;quoted
- phy_modify_paged_changed(phydev, 0xa43, RTL8211F_PHYCR1, val, val); + if (!(priv->quirks & RTL821X_ALDPS_DISABLE_FEATURE)) { + val = RTL8211F_ALDPS_ENABLE | RTL8211F_ALDPS_PLL_OFF |RTL8211F_ALDPS_XTAL_OFF;quoted
+ phy_modify_paged_changed(phydev, 0xa43, RTL8211F_PHYCR1, val,val);quoted
+ }Similar questions as with the previous patch, but also... this doesn't actually disable the feature if it was previously turned on. E.g. a kexec() from a current kernel that has set these features into a subsequent kernel that the DT requests the feature to be disabled. Or a boot loader that has enabled this feature.
Sorry, I don't know what your meanings. As I explained before, boot loader also can configure PHY registers, but kernel should not depend on what boot loader did. If you use kexec() to boot kernel with DT request to disable this clock, PHY probe also can parse this property to disable it. I know little about kexec(), could you please explain more if I misunderstand?
If DT specifies that this feature is disabled, shouldn't this code be disabling it explicitly?
Yes, exactly should. Best Regards, Joakim Zhang
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