Messages in this thread | | | Subject | Re: [PATCH v2] net/phy/vitesse: Configure RGMII skew on VSC8601, if needed | From | Alex <> | Date | Wed, 16 Nov 2016 08:44:30 -0800 |
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On 11/16/2016 05:50 AM, Andrew Lunn wrote: > On Wed, Nov 16, 2016 at 01:02:33AM -0800, Alexandru Gagniuc wrote: >> With RGMII, we need a 1.5 to 2ns skew between clock and data lines. The >> VSC8601 can handle this internally. While the VSC8601 can set more >> fine-grained delays, the standard skew settings work out of the box. >> The same heuristic is used to determine when this skew should be enabled >> as in vsc824x_config_init(). >> >> +/* This adds a skew for both TX and RX clocks, so the skew should only be >> + * applied to "rgmii-id" interfaces. It may not work as expected >> + * on "rgmii-txid", "rgmii-rxid" or "rgmii" interfaces. */ > > Hi Alexandru > > You should be able to make "rgmii" work as expected. If that is the > phy mode, disable the skew.
And that's exactly the implemented behavior. See vsc8601_config_init() below.
Alex
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