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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Jun 04, 2021 at 06:57:33PM +0800, Michael Sit Wei Hong wrote: > From: Voon Weifeng > > The Intel mGbE supports 2.5Gbps link speed by increasing the clock rate by > 2.5 times of the original rate. In this mode, the serdes/PHY operates at a > serial baud rate of 3.125 Gbps and the PCS data path and GMII interface of > the MAC operate at 312.5 MHz instead of 125 MHz. > > For Intel mGbE, the overclocking of 2.5 times clock rate to support 2.5G is > only able to be configured in the BIOS during boot time. Kernel driver has > no access to modify the clock rate for 1Gbps/2.5G mode. The way to > determined the current 1G/2.5G mode is by reading a dedicated adhoc > register through mdio bus. In short, after the system boot up, it is either > in 1G mode or 2.5G mode which not able to be changed on the fly. > > Compared to 1G mode, the 2.5G mode selects the 2500BASEX as PHY interface and > disables the xpcs_an_inband. This is to cater for some PHYs that only > supports 2500BASEX PHY interface with no autonegotiation. > > v2: remove MAC supported link speed masking > v3: Restructure to introduce intel_speed_mode_2500() to read serdes registers > for max speed supported and select the appropritate configuration. > Use max_speed to determine the supported link speed mask. > > Signed-off-by: Voon Weifeng > Signed-off-by: Michael Sit Wei Hong > --- Reviewed-by: Vladimir Oltean _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel