From: Inochi Amaoto <inochiama@gmail•com>
To: "Russell King (Oracle)" <linux@armlinux•org.uk>,
Inochi Amaoto <inochiama@gmail•com>
Cc: Andrew Lunn <andrew+netdev@lunn•ch>,
"David S. Miller" <davem@davemloft•net>,
Eric Dumazet <edumazet@google•com>,
Jakub Kicinski <kuba@kernel•org>,
Paolo Abeni <pabeni@redhat•com>, Rob Herring <robh@kernel•org>,
Krzysztof Kozlowski <krzk+dt@kernel•org>,
Conor Dooley <conor+dt@kernel•org>, Yixun Lan <dlan@gentoo•org>,
Maxime Coquelin <mcoquelin.stm32@gmail•com>,
Alexandre Torgue <alexandre.torgue@foss•st.com>,
Richard Cochran <richardcochran@gmail•com>,
Paul Walmsley <pjw@kernel•org>,
Palmer Dabbelt <palmer@dabbelt•com>,
Albert Ou <aou@eecs•berkeley.edu>,
Alexandre Ghiti <alex@ghiti•fr>,
Yanteng Si <siyanteng@cqsoftware•com.cn>,
Yao Zi <ziyao@disroot•org>,
Vladimir Oltean <vladimir.oltean@nxp•com>,
Lad Prabhakar <prabhakar.mahadev-lad.rj@bp•renesas.com>,
Choong Yong Liang <yong.liang.choong@linux•intel.com>,
Maxime Chevallier <maxime.chevallier@bootlin•com>,
Chen-Yu Tsai <wens@kernel•org>,
Shangjuan Wei <weishangjuan@eswincomputing•com>,
Boon Khai Ng <boon.khai.ng@altera•com>,
Quentin Schulz <quentin.schulz@cherry•de>,
Giuseppe Cavallaro <peppe.cavallaro@st•com>,
Jose Abreu <joabreu@synopsys•com>,
netdev@vger•kernel.org, devicetree@vger•kernel.org,
linux-kernel@vger•kernel.org, linux-riscv@lists•infradead.org,
spacemit@lists•linux.dev,
linux-stm32@st-md-mailman•stormreply.com,
linux-arm-kernel@lists•infradead.org,
Longbin Li <looong.bin@gmail•com>
Subject: Re: [PATCH net-next 3/3] net: stmmac: Add glue layer for Spacemit K3 SoC
Date: Thu, 22 Jan 2026 06:36:18 +0800 [thread overview]
Message-ID: <aXFS7fW8kdsi_2ud@inochi.infowork> (raw)
In-Reply-To: <aXDAmDEpUArE1_en@shell.armlinux.org.uk>
On Wed, Jan 21, 2026 at 12:03:36PM +0000, Russell King (Oracle) wrote:
> On Tue, Jan 20, 2026 at 01:05:39PM +0800, Inochi Amaoto wrote:
> > > > + mask = RGMII_RX_DLINE_STEP | RGMII_TX_DLINE_CODE | RGMII_TX_DLINE_EN |
> > > > + RGMII_TX_DLINE_STEP | RGMII_RX_DLINE_CODE | RGMII_RX_DLINE_EN;
> > > > + val = FIELD_PREP(RGMII_TX_DLINE_CODE, tx_config) |
> > > > + FIELD_PREP(RGMII_TX_DLINE_CODE, tx_code) | RGMII_TX_DLINE_EN |
> > > > + FIELD_PREP(RGMII_TX_DLINE_CODE, rx_config) |
> > > > + FIELD_PREP(RGMII_RX_DLINE_CODE, rx_code) | RGMII_RX_DLINE_EN;
> > >
> > > These FIELD_PREP() fields look wrong. Did you mean to use DLINE_CODE
> > > both tx_config and tx_code, and did you mean to use TX_DLINE_CODE for
> > > rx_config ?
> > >
> >
> > This should be RGMII_TX_DLINE_CODE. This is a copy paste error, I
> > will fix it.
>
> Are you sure?
>
> In that case, please change this to:
>
> val = FIELD_PREP(RGMII_TX_DLINE_CODE, tx_config | tx_code |
> rx_config | rx_code) |
> RGMII_TX_DLINE_EN | RGMII_RX_DLINE_EN;
>
> If that isn't what you meant, then your reply is wrong, and it seems
> you're confused, which makes me then question how reliable your
> replies are.
>
That's wrong, I think I have reply it in a wrong way, it should be
RGMII_TX_DLINE_STEP -> tx_config
RGMII_TX_DLINE_CODE -> tx_code
RGMII_RX_DLINE_STEP -> rx_config
RGMII_RX_DLINE_CODE -> rx_code
The RGMII_[RX|TX]_DLINE_STEP register selects which step is used for
rx/tx delay. The RGMII_[RX|TX]_DLINE_CODE register provides the factor
used for calculating the delay. These register are computed in the
spacemit_dwmac_detected_delay_value(). And finally we can got a delay
with "code * step / 10 * 0.9" for both rx and tx.
Regards,
Inochi
> > > > + plat_dat->clk_tx_i = devm_clk_get_enabled(&pdev->dev, "tx");
> > > > + if (IS_ERR(plat_dat->clk_tx_i))
> > > > + return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat->clk_tx_i),
> > > > + "failed to get tx clock\n");
> > >
> > > You set plat_dat->clk_tx_i, but you don't point
> > > plat_dat->set_clk_tx_rate at anything, which means the stmmac core
> > > does nothing with this.
> > >
> >
> > Yes, the vendor told me that the internal tx clock rate will be auto
> > changed when the speed rate is changed. So no software interaction
> > is needed.
>
> Please do not assign a clock to clk_tx_i that is not the dwmac
> clk_tx_i input. clk_tx_i is a name used by the Synopsys DWMAC for a
> specific clock.
>
> As you don't need to do anything with it other than to get and enable
> it, consider using just a local variable here.
>
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
next prev parent reply other threads:[~2026-01-22 0:19 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-20 4:36 [PATCH net-next 0/3] riscv: spacemit: Add ethernet support for K3 Inochi Amaoto
2026-01-20 4:36 ` [PATCH net-next 1/3] dt-bindings: net: Add support for Spacemit K3 dwmac Inochi Amaoto
2026-01-20 10:55 ` Yao Zi
2026-01-20 11:39 ` Inochi Amaoto
2026-01-20 13:48 ` Andrew Lunn
2026-01-20 22:31 ` Inochi Amaoto
2026-01-20 4:36 ` [PATCH net-next 2/3] net: stmmac: platform: Add snps,dwmac-5.40a IP compatible string Inochi Amaoto
2026-01-20 4:36 ` [PATCH net-next 3/3] net: stmmac: Add glue layer for Spacemit K3 SoC Inochi Amaoto
2026-01-20 4:56 ` Russell King (Oracle)
2026-01-20 5:05 ` Inochi Amaoto
2026-01-21 12:03 ` Russell King (Oracle)
2026-01-21 22:36 ` Inochi Amaoto [this message]
2026-01-21 23:56 ` Inochi Amaoto
2026-01-20 11:13 ` Yao Zi
2026-01-20 11:28 ` Russell King (Oracle)
2026-01-20 11:43 ` Inochi Amaoto
2026-01-20 11:32 ` Yixun Lan
2026-01-20 11:41 ` Inochi Amaoto
2026-01-20 13:56 ` Andrew Lunn
2026-01-20 22:36 ` Inochi Amaoto
2026-01-21 1:29 ` Andrew Lunn
2026-01-21 1:37 ` Inochi Amaoto
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