netdev - Re: [PATCH 3/3] net: stmmac: Add DWMAC glue layer for Renesas GBETH

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Message-ID: <Z8S6DM8ySpoyb8No@shell.armlinux.org.uk>
Date: Sun, 2 Mar 2025 20:05:32 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Jose Abreu <joabreu@...opsys.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH 3/3] net: stmmac: Add DWMAC glue layer for Renesas GBETH

On Sun, Mar 02, 2025 at 07:33:10PM +0000, Russell King (Oracle) wrote:
> On Sun, Mar 02, 2025 at 06:18:08PM +0000, Prabhakar wrote:
> > +	gbeth->dev = dev;
> > +	gbeth->regs = stmmac_res.addr;
> > +	plat_dat->bsp_priv = gbeth;
> > +	plat_dat->set_clk_tx_rate = stmmac_set_clk_tx_rate;
> 
> Thanks for using that!
> 
> > +	plat_dat->flags |= STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY |
> > +			   STMMAC_FLAG_EN_TX_LPI_CLOCKGATING |
> 
> I would like to know what value tx_clk_stop is in
> stmmac_mac_enable_tx_lpi() for your setup. Ideally, stmmac should
> use the capability report from the PHY to decide whether the
> transmit clock can be gated, but sadly we haven't had any support
> in phylib/phylink for that until recently, and I haven't modified
> stmmac to allow use of that. However, it would be good to gain
> knowledge in this area.
> 
> > +			   STMMAC_FLAG_RX_CLK_RUNS_IN_LPI |
> 
> What is the reason for setting this flag? If it's because of suspend/
> resume failures, does my "net: stmmac: fix resume failures due to
> RX clock" series solve this for you without requiring this flag?

https://lore.kernel.org/r/Z8B4tVd4nLUKXdQ4@shell.armlinux.org.uk

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