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SubjectRe: [PATCH net-next 7/9] net: phy: icplus: select page before writing control register
Am 2021-02-10 11:30, schrieb Russell King - ARM Linux admin:
> On Wed, Feb 10, 2021 at 08:03:07AM +0100, Heiner Kallweit wrote:
>> On 09.02.2021 17:40, Michael Walle wrote:
>> > +out:
>> > + return phy_restore_page(phydev, oldpage, err);
>>
>> If a random page was set before entering config_init, do we actually
>> want
>> to restore it? Or wouldn't it be better to set the default page as
>> part
>> of initialization?
>
> I think you've missed asking one key question: does the paging on this
> PHY affect the standardised registers at 0..15 inclusive, or does it
> only affect registers 16..31?

For this PHY it affects only registers >=16. But that doesn't invaldiate
the point that for other PHYs this might affect all regsisters. Eg. ones
where you could select between fiber and copper pages, right?

> If it doesn't affect the standardised registers, then the genphy_*
> functions don't care which page is selected.

--
-michael

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