Re: [PATCH net-next v3 46/47] arm64: dts: ls1046ardb: Add serdes bindings

[Sean Anderson]

On 7/22/22 8:41 AM, Camelia Alexandra Groza wrote:
>> -----Original Message-----
>> From: Sean Anderson <sean.anderson@xxxxxxxx>
>> Sent: Thursday, July 21, 2022 18:41
>> To: Camelia Alexandra Groza <camelia.groza@xxxxxxx>; David S . Miller
>> <davem@xxxxxxxxxxxxx>; Jakub Kicinski <kuba@xxxxxxxxxx>; Madalin Bucur
>> <madalin.bucur@xxxxxxx>; netdev@xxxxxxxxxxxxxxx
>> Cc: Paolo Abeni <pabeni@xxxxxxxxxx>; Eric Dumazet
>> <edumazet@xxxxxxxxxx>; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; Russell
>> King <linux@xxxxxxxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx; Kishon Vijay
>> Abraham I <kishon@xxxxxx>; Krzysztof Kozlowski
>> <krzysztof.kozlowski+dt@xxxxxxxxxx>; Leo Li <leoyang.li@xxxxxxx>; Rob
>> Herring <robh+dt@xxxxxxxxxx>; Shawn Guo <shawnguo@xxxxxxxxxx>; Vinod
>> Koul <vkoul@xxxxxxxxxx>; devicetree@xxxxxxxxxxxxxxx; linux-
>> phy@xxxxxxxxxxxxxxxxxxx
>> Subject: Re: [PATCH net-next v3 46/47] arm64: dts: ls1046ardb: Add serdes
>> bindings
>> 
>> 
>> 
>> On 7/21/22 10:20 AM, Camelia Alexandra Groza wrote:
>> >> -----Original Message-----
>> >> From: Sean Anderson <sean.anderson@xxxxxxxx>
>> >> Sent: Saturday, July 16, 2022 1:00
>> >> To: David S . Miller <davem@xxxxxxxxxxxxx>; Jakub Kicinski
>> >> <kuba@xxxxxxxxxx>; Madalin Bucur <madalin.bucur@xxxxxxx>;
>> >> netdev@xxxxxxxxxxxxxxx
>> >> Cc: Paolo Abeni <pabeni@xxxxxxxxxx>; Eric Dumazet
>> >> <edumazet@xxxxxxxxxx>; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; Russell
>> >> King <linux@xxxxxxxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx; Sean
>> Anderson
>> >> <sean.anderson@xxxxxxxx>; Kishon Vijay Abraham I <kishon@xxxxxx>;
>> >> Krzysztof Kozlowski <krzysztof.kozlowski+dt@xxxxxxxxxx>; Leo Li
>> >> <leoyang.li@xxxxxxx>; Rob Herring <robh+dt@xxxxxxxxxx>; Shawn Guo
>> >> <shawnguo@xxxxxxxxxx>; Vinod Koul <vkoul@xxxxxxxxxx>;
>> >> devicetree@xxxxxxxxxxxxxxx; linux-phy@xxxxxxxxxxxxxxxxxxx
>> >> Subject: [PATCH net-next v3 46/47] arm64: dts: ls1046ardb: Add serdes
>> >> bindings
>> >>
>> >> This adds appropriate bindings for the macs which use the SerDes. The
>> >> 156.25MHz fixed clock is a crystal. The 100MHz clocks (there are
>> >> actually 3) come from a Renesas 6V49205B at address 69 on i2c0. There is
>> >> no driver for this device (and as far as I know all you can do with the
>> >> 100MHz clocks is gate them), so I have chosen to model it as a single
>> >> fixed clock.
>> >>
>> >> Note: the SerDes1 lane numbering for the LS1046A is *reversed*.
>> >> This means that Lane A (what the driver thinks is lane 0) uses pins
>> >> SD1_TX3_P/N.
>> >>
>> >> Because this will break ethernet if the serdes is not enabled, enable
>> >> the serdes driver by default on Layerscape.
>> >>
>> >> Signed-off-by: Sean Anderson <sean.anderson@xxxxxxxx>
>> >> ---
>> >> Please let me know if there is a better/more specific config I can use
>> >> here.
>> >>
>> >> (no changes since v1)
>> >
>> > My LS1046ARDB hangs at boot with this patch right after the second SerDes
>> is probed,
>> > right before the point where the PCI host bridge is registered. I can get
>> around this
>> > either by disabling the second SerDes node from the device tree, or
>> disabling
>> > CONFIG_PCI_LAYERSCAPE at build.
>> >
>> > I haven't debugged it more but there seems to be an issue here.
>> 
>> Hm. Do you have anything plugged into the PCIe/SATA slots? I haven't been
>> testing with
>> anything there. For now, it may be better to just leave it disabled.
>> 
>> --Sean
> 
> Yes, I have an Intel e1000 card plugged in.
> 
> Camelia
> 

Can you try the following patch? I was able to boot with PCI with it applied.