Thread (14 messages) 14 messages, 4 authors, 2021-12-03

RE: [PATCH net-next v3 2/2] net: ethernet: Add driver for Sunplus SP7021

From: Wells Lu 呂芳騰 <hidden>
Date: 2021-12-02 18:47:17
Also in: lkml, netdev

Hi Andrew,

Thank you for explanation.

I'll add phy_support_asym_pause() after PHY connected next patch.

I found some drivers call phy_set_max_speed() to set PHY speed to
100M after PHY connected. Is that necessary? From 'supported', PHY 
supports 10M/100M already.

I also found some drivers call phy_start_aneg() after PHY started.
Is that necessary? From status register of PHY, 'auto-nego' has 
completed.


Best regards,
Wells

quoted
I printed out the value of 'supported' and 'advertising'.
'supported' shows PHY device supports Pause and AsymPause (0x62cf).
But 'advertising' shows PHY device does not support Pause or AsymPause (0x02cf).
Is this correct?

How to let link partner know local node supports Pause & AsymPause
(flow control)?
'supported' indicates that the PHY can do. It has the ability to advertise pause. But we
don't automatically copy those bits into 'advertising' because we don't know if the MAC
actually supports pause/asym pause.

The MAC driver needs to call phy_support_sym_pause() or
phy_support_asym_pause() to let phylib know what it can do. phylib will then add the
appropriate bits to 'advertising'.
quoted
Will mii_read() and mii_write() be called in interrupt context?
No. Only thread context, because it uses a mutex to prevent multiple accesses at the same
time.

	 Andrew
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