linux-kernel - RE: [EXT] Re: [PATCH v2 net 2/2] net: stmmac: dwmac-imx: pause the TXC clock in fixed-link

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Date:   Fri, 28 Jul 2023 15:09:19 +0000
From:   Shenwei Wang <shenwei.wang@....com>
To:     Fabio Estevam <festevam@...il.com>, Andrew Lunn <andrew@...n.ch>
CC:     Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Vinod Koul <vkoul@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        Simon Horman <simon.horman@...igine.com>,
        Andrew Halaney <ahalaney@...hat.com>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Wong Vee Khee <veekhee@...le.com>,
        Revanth Kumar Uppala <ruppala@...dia.com>,
        Jochen Henneberg <jh@...neberg-systemdesign.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-amlogic@...ts.infradead.org" 
        <linux-amlogic@...ts.infradead.org>,
        "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
        Frank Li <frank.li@....com>
Subject: RE: [EXT] Re: [PATCH v2 net 2/2] net: stmmac: dwmac-imx: pause the
 TXC clock in fixed-link



> -----Original Message-----
> From: Fabio Estevam <festevam@...il.com>
> Sent: Friday, July 28, 2023 6:01 AM
> To: Shenwei Wang <shenwei.wang@....com>; Andrew Lunn <andrew@...n.ch>
> Cc: Russell King <linux@...linux.org.uk>; David S. Miller
> <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>; Jakub
> Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>; Maxime
> Coquelin <mcoquelin.stm32@...il.com>; Shawn Guo <shawnguo@...nel.org>;
> Sascha Hauer <s.hauer@...gutronix.de>; Neil Armstrong
> <neil.armstrong@...aro.org>; Kevin Hilman <khilman@...libre.com>; Vinod
> Koul <vkoul@...nel.org>; Chen-Yu Tsai <wens@...e.org>; Jernej Skrabec
> <jernej.skrabec@...il.com>; Samuel Holland <samuel@...lland.org>;
> Giuseppe Cavallaro <peppe.cavallaro@...com>; Alexandre Torgue
> <alexandre.torgue@...s.st.com>; Jose Abreu <joabreu@...opsys.com>;
> Pengutronix Kernel Team <kernel@...gutronix.de>; dl-linux-imx <linux-
> 
> 
> On Thu, Jul 27, 2023 at 12:25 PM Shenwei Wang <shenwei.wang@....com>
> wrote:
> 
> >         struct plat_stmmacenet_data *plat_dat = priv; @@ -317,8
> > +359,11 @@ static int imx_dwmac_probe(struct platform_device *pdev)
> >         plat_dat->exit = imx_dwmac_exit;
> >         plat_dat->clks_config = imx_dwmac_clks_config;
> >         plat_dat->fix_mac_speed = imx_dwmac_fix_speed;
> > +       if (of_machine_is_compatible("fsl,imx93"))
> > +               plat_dat->fix_mac_speed = imx_dwmac_fix_speed_mx93;
> 
> So you are forcing this on all imx93 boards, even if they don't use a SJA1105.
> 

Yes, that's the purpose because it won't hurt even the other side is not SJA1105.

> Andrew Lunn gave the following feedback in v1:
> 
> "The SJA1105 has the problem, so i would expect it to be involved in the solution.
> Otherwise, how is this going to work for other MAC drivers?
> 
> Maybe you need to expose a common clock framework clock for the TXC clock
> line, which the SJA1105 can disable/enable? That then makes it clear what other
> MAC drivers need to do."

I have been considering this plan for some time. The idea should be implemented 
across all i.mx8/9 platforms. I am going to start to work on it in the following month, 
and it will take some time to implement it.

Thanks,
Shenwei