On Fri, Mar 13, 2020 at 1:32 PM Fabio Estevam <festevam@xxxxxxxxx> wrote: > > Hi Alifer, > > On Fri, Mar 6, 2020 at 7:41 AM Alifer Moraes <alifer.wsdm@xxxxxxxxx> wrote: > > > > i.MX8MQ Phanbell board uses Realtek RTL8211FD as Ethernet PHY. > > Its datasheet states that the proper post reset duration should be at least 50 ms. > > The datasheet I found in the web states: > > "The RTL8211F(I)/RTL8211FD(I) has a PHYRSTB pin to reset the chip. For > a complete PHY reset, this pin must be asserted low for at least 10ms > (Tgap in Figure 9) for the internal regulator. Wait for a further 30ms > (for internal circuits settling time) before accessing the PHY > register" > > Where does the 50ms requirement come from? Do you have an updated > datasheet that says 50ms instead? Just found this one: https://datasheet.lcsc.com/szlcsc/1909021205_Realtek-Semicon-RTL8211F-CG_C187932.pdf Which says "Wait for at least 50ms* (for internal circuits settling time) before accessing the PHY register.", so your patch is correct, thanks. This also fixes Ethernet in U-Boot, so: Reviewed-by: Fabio Estevam <festevam@xxxxxxxxx>
