netdev - Re: [PATCH net] net: stmmac: dwmac-socfpga: Don't access SGMII adapter when not available

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Date: Tue, 28 Nov 2023 17:37:30 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	linux-arm-kernel@...ts.infradead.org,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Simon Horman <horms@...nel.org>,
	linux-stm32@...md-mailman.stormreply.com,
	alexis.lothore@...tlin.com
Subject: Re: [PATCH net] net: stmmac: dwmac-socfpga: Don't access SGMII
 adapter when not available

On Tue, Nov 28, 2023 at 10:45:37AM +0100, Maxime Chevallier wrote:
> The SGMII adapter isn't present on all dwmac-socfpga implementations.
> Make sure we don't try to configure it if we don't have this adapter.

If it does not exist, why even try to call socfpga_sgmii_config()?

It seems like this test needs moving up the call stack. socfpga_gen5_set_phy_mode():

	if (phymode == PHY_INTERFACE_MODE_SGMII)
		if (dwmac->sgmii_adapter_base)
			socfpga_sgmii_config(dwmac, true);
		else
			return -EINVAL;
			
Same in socfpga_gen10_set_phy_mode()?

     Andrew