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Wangxun NICs support the connection with SFP to RJ45 module. In this case, PCS need to be configured in SGMII mode. According to chapter 6.11.1 "SGMII Auto-Negitiation" of DesignWare Cores Ethernet PCS (version 3.20a) and custom design manual, do the following configuration when the interface mode is SGMII. 1. program VR_MII_AN_CTRL bit(3) [TX_CONFIG] = 1b (PHY side SGMII) 2. program VR_MII_AN_CTRL bit(8) [MII_CTRL] = 1b (8-bit MII) 3. program VR_MII_DIG_CTRL1 bit(0) [PHY_MODE_CTRL] = 1b Also CL37 AN in backplane configurations need to be enabled because of the special hardware design. Another thing to note is that PMA needs to be reconfigured before each CL37 AN configuration for SGMII, otherwise AN will fail, although we don't know why. On this device, CL37_ANSGM_STS (bit[4:1] of VR_MII_AN_INTR_STS) indicates the status received from remote link during the auto-negotiation, and self-clear after the auto-negotiation is complete. Meanwhile, CL37_ANCMPLT_INTR will be set to 1, to indicate CL37 AN is complete. So add another way to get the state for CL37 SGMII. Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.