On Thu, Dec 21, 2017 at 05:18:59PM +0200, Vladimir Zapolskiy wrote:
> From: Bogdan Mirea <Bogdan-Stefan_Mirea@xxxxxxxxxx>
>
> The present change is a bug fix for AVB link iteratively up/down.
>
> Steps to reproduce:
> - start AVB TX stream (Using aplay via MSE),
> - disconnect+reconnect the eth cable,
> - after a reconnection the eth connection goes iteratively up/down
> without user interaction,
> - this may heal after some seconds or even stay for minutes.
>
> As the documentation specifies, the "renesas,no-ether-link" option
> should be used when a board does not provide a proper AVB_LINK signal.
> There is no need for this option enabled on RCAR H3/M3 Salvator-X/XS
> and ULCB starter kits since the AVB_LINK is correctly handled by HW.
>
> Choosing to keep or remove the "renesas,no-ether-link" option will
> have impact on the code flow in the following ways:
> - keeping this option enabled may lead to unexpected behavior since
> the RX & TX are enabled/disabled directly from adjust_link function
> without any HW interrogation,
> - removing this option, the RX & TX will only be enabled/disabled after
> HW interrogation. The HW check is made through the LMON pin in PSR
> register which specifies AVB_LINK signal value (0 - at low level;
> 1 - at high level).
>
> In conclusion, the present change is also a safety improvement because
> it removes the "renesas,no-ether-link" option leading to a proper way
> of detecting the link state based on HW interrogation and not on
> software heuristic.
>
> Fixes: 253ed045a34d ("arm64: dts: renesas: Extract common ULCB board support")
The above shuffles the code around but does not introduce the problem
as far as I can see. Instead I think we should use:
Fixes: 144bf6ccb13f ("arm64: dts: h3ulcb: enable EthernetAVB")
Fixes: 883fae315a6a ("arm64: dts: m3ulcb: enable EthernetAVB")
> Signed-off-by: Bogdan Mirea <Bogdan-Stefan_Mirea@xxxxxxxxxx>
> Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@xxxxxxxxxx>
> ---
> arch/arm64/boot/dts/renesas/ulcb.dtsi | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/renesas/ulcb.dtsi b/arch/arm64/boot/dts/renesas/ulcb.dtsi
> index be91016e0b48..3e7a6b94e9f8 100644
> --- a/arch/arm64/boot/dts/renesas/ulcb.dtsi
> +++ b/arch/arm64/boot/dts/renesas/ulcb.dtsi
> @@ -145,7 +145,6 @@
> &avb {
> pinctrl-0 = <&avb_pins>;
> pinctrl-names = "default";
> - renesas,no-ether-link;
> phy-handle = <&phy0>;
> status = "okay";
>
> --
> 2.8.1
>
