linux-kernel - Re: [linux-next-v2 1/5] arm64: dts: rockchip: Fix gmac phy mode to rgmii on Rock 3A SBC.

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Date:   Fri, 18 Nov 2022 08:03:35 +0100
From:   Michael Riesch <michael.riesch@...fvision.net>
To:     Anand Moon <linux.amoon@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     Chukun Pan <amadeus@....edu.cn>, Peter Geis <pgwipeout@...il.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [linux-next-v2 1/5] arm64: dts: rockchip: Fix gmac phy mode to
 rgmii on Rock 3A SBC.

Hi Anand,

On 11/16/22 21:01, Anand Moon wrote:
> On rk356x ethernet phy support reduced media independent interface (RMII)
> and reduced gigabit media independent interface (RGMII).
> So set the phy mode to rgmii to support clock delay, also
> add TX and RX delay for phy-mode.

Based on this commit message I still don't understand what you are
actually trying to fix here. If you encounter network problems/stability
issues, please let me know what test triggers the faulty behavior.
Please describe the problem you are facing in detail here or in the
cover letter.

> Fix following warning
> 
> [    7.365215] rk_gmac-dwmac fe010000.ethernet: Can not read property: tx_delay.
> [    7.365219] rk_gmac-dwmac fe010000.ethernet: set tx_delay to 0x30
> [    7.365224] rk_gmac-dwmac fe010000.ethernet: Can not read property: rx_delay.
> [    7.365228] rk_gmac-dwmac fe010000.ethernet: set rx_delay to 0x10

If the only purpose of this patch is to get rid of this warnings, it may
make sense to set them to dev_dbg as Peter pointed out.

Best regards,
Michael

> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
> V2: Fix commit message and added the RX and TX clock delay.
> ---
>  arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts b/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> index ea74ba32fbbd..e1c75532dcee 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> @@ -253,13 +253,16 @@ &gmac1 {
>  	assigned-clock-rates = <0>, <125000000>;
>  	clock_in_out = "output";
>  	phy-handle = <&rgmii_phy1>;
> -	phy-mode = "rgmii-id";
> +	phy-mode = "rgmii";
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&gmac1m1_miim
>  		     &gmac1m1_tx_bus2
>  		     &gmac1m1_rx_bus2
>  		     &gmac1m1_rgmii_clk
>  		     &gmac1m1_rgmii_bus>;
> +
> +	tx_delay = <0x4f>;
> +	rx_delay = <0x26>;
>  	status = "okay";
>  };
>