linux-kernel - Re: [PATCHv2 1/2] ARM: dts: imx6sx: Use MX6SX_CLK

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Date:   Tue, 7 May 2019 20:09:58 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Andy Duan <fugang.duan@....com>
Cc:     Aisheng Dong <aisheng.dong@....com>, Kay-Liu <liuk@...ca.net.cn>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 1/2] ARM: dts: imx6sx: Use MX6SX_CLK_ENET for fec 'ahb' clock

Hi Andy,

On Sun, May 5, 2019 at 5:15 AM Andy Duan <fugang.duan@....com> wrote:

> Nack the patch !
>
> Firstly, i.MX6SX has ENET AHB bus clock for MAC, and currently it is set 200Mhz like clock tree:
>         IMX6SX_CLK_ENET_PODF 200Mhz -> IMX6SX_CLK_ENET_SEL -> IMX6SX_CLK_ENET_AHB
>
> IMX6SX_CLK_ENET the clock is IPG clock for ENET IP ipg_clk_mac0_s/ipg_clk_s.
> (Please check RM Table 18-3. System Clocks, Gating, and Override)

Ok, but could you please show us where in the Reference Manual the
IMX6SX_CLK_ENET_AHB is mentioned?

I don't see ENET_AHB in imx6qdl Reference Manual either and we don't
have a ENET_AHB the clk-imx6q driver and nor in the devicetree,

> Secondly,  for your issue you caught, which was fixed by patch:
> commit d7c3a206e6338e4ccdf030719dec028e26a521d5
> Author: Andy Duan <fugang.duan@....com>
> Date:   Tue Apr 9 03:40:56 2019 +0000
>
>     net: fec: manage ahb clock in runtime pm

Would this also fix the case where power management support is disabled?

If I understand correctly the explanation from Kay-Liu he would still
see a hang in the case when PM is disabled.

Thanks