netdev - 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 08:00:32 -0300
From: Fabio Estevam <festevam@...il.com>
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>, 
	NXP Linux Team <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, 
	linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-amlogic@...ts.infradead.org, imx@...ts.linux.dev, 
	Frank Li <frank.li@....com>
Subject: Re: [PATCH v2 net 2/2] net: stmmac: dwmac-imx: pause the TXC clock in fixed-link

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.

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."