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amd-xgbe-phy: PHY KX/KR mode differences

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The PHY requires different settings for the Decision Feedback Analyzer
(DFE) when running in KX mode vs. KR mode. Update the code to change
these settings when changing modes in order to provide a more stable
link.

Additionally, adjust the 10GbE PQ skew default setting to a more sane
value.

Signed-off-by: Tom Lendacky <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Tom Lendacky 2015-02-24 10:47:49 -06:00 • committed by David S. Miller
commit 74ad752442
2 changed files with 84 additions and 2 deletions
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4
Documentation/devicetree/bindings/net/amd-xgbe-phy.txt
View file

@ -27,6 +27,8 @@ property is used.
- amd,serdes-cdr-rate: CDR rate speed selection
- amd,serdes-pq-skew: PQ (data sampling) skew
- amd,serdes-tx-amp: TX amplitude boost
- amd,serdes-dfe-tap-config: DFE taps available to run
- amd,serdes-dfe-tap-enable: DFE taps to enable
Example:
xgbe_phy@e1240800 {
@ -41,4 +43,6 @@ Example:
amd,serdes-cdr-rate = <2>, <2>, <7>;
amd,serdes-pq-skew = <10>, <10>, <30>;
amd,serdes-tx-amp = <15>, <15>, <10>;
amd,serdes-dfe-tap-config = <3>, <3>, <1>;
amd,serdes-dfe-tap-enable = <0>, <0>, <127>;
};