On Fri, Nov 08, 2024 at 07:31:31PM +0800, Lei Wei wrote: > On 11/6/2024 11:43 AM, Andrew Lunn wrote: > > On Wed, Nov 06, 2024 at 11:16:37AM +0800, Lei Wei wrote: > > > On 11/1/2024 9:21 PM, Andrew Lunn wrote: > > > > How does Qualcomm SGMII AN mode differ from Cisco SGMII AN mode? > > > > > > Qualcomm SGMII AN mode extends Cisco SGMII spec Revision 1.8 by adding pause > > > bit support in the SGMII word format. It re-uses two of the reserved bits > > > 1..9 for this purpose. The PCS supports both Qualcomm SGMII AN and Cisco > > > SGMII AN modes. > > > > Is Qualcomm SGMII AN actually needed? I assume it only works against a > > Qualcomm PHY? What interoperability testing have you do against > > non-Qualcomm PHYs? > > I agree that using Cisco SGMII AN mode as default is more appropriate, > since is more commonly used with PHYs. I will make this change. > > Qualcomm SGMII AN is an extension of top of Cisco SGMII AN (only > pause bits difference). So it is expected to be compatible with > non-Qualcomm PHYs which use Cisco SGMII AN. I believe Marvell have similar extensions. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
