netdev - Re: Atheros 8035 PHY only works when at803x_config

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Date:	Thu, 09 Apr 2015 17:32:59 +0200
From:	Daniel Mack <daniel@...que.org>
To:	Mason <slash.tmp@...e.fr>, netdev@...r.kernel.org
CC:	Florian Fainelli <f.fainelli@...il.com>,
	Mugunthan <mugunthanvnm@...com>,
	"David S. Miller" <davem@...emloft.net>,
	Matus Ujhelyi <ujhelyi.m@...il.com>
Subject: Re: Atheros 8035 PHY only works when at803x_config_init() is commented
 out

On 04/09/2015 05:22 PM, Mason wrote:
> For the record, I dumped the PHY registers
> A) upon entering phy_init_hw
> B) before leaving phy_init_hw (thus right after at803x_config_init)
> 
> IDX 1: b2 LINK STATUS, b5 AUTO-NEGOTIATION COMPLETE
> => Difference in status bits, seems reasonable
> 
> IDX 5: Link partner ability (base page)
> => seems reasonable (no partner yet?)
> 
> IDX 6: Auto-Negotiation Expansion
> => seems reasonable (no partner yet?)
> 
> IDX 10: 1000 BASE-T Status (HW reset = SW reset = 0)
> (ALSO: Contents of this register clear after a read operation has occurred.)
> => Looks like my own read cleared it
> 
> IDX 17: PHY-Specific Status
> b1 = "POLARITY (real time)"?
> => Difference in status bits, seems reasonable? (
> 
> IDX 19: Interrupt Status
> => Looks like some interrupt requests might have been discarded?
> 
> IDX 27: This register is undocumented
> 
> Nothing looks suspicious, except maybe the Interrupt Status?

What about the debug registers, such as the one that configures the
RGMII TX/RX clock delay (4.2.25, 4.2.26). These are indirectly
addressed, see at803x_config_init().


Daniel

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