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Date: Tue, 1 Aug 2023 17:10:07 +0000
From: Shenwei Wang <shenwei.wang@....com>
To: Johannes Zink <j.zink@...gutronix.de>,
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>
CC: Giuseppe Cavallaro <peppe.cavallaro@...com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Jose Abreu <joabreu@...opsys.com>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
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 v3 net 2/2] net: stmmac: dwmac-imx: pause the
TXC clock in fixed-link
> -----Original Message-----
> From: Johannes Zink <j.zink@...gutronix.de>
> Sent: Tuesday, August 1, 2023 7:48 AM
> To: Shenwei Wang <shenwei.wang@....com>; 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>
> Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>; Alexandre Torgue
> <alexandre.torgue@...s.st.com>; Jose Abreu <joabreu@...opsys.com>;
> Pengutronix Kernel Team <kernel@...gutronix.de>; Fabio Estevam
> <festevam@...il.com>; 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; 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: [EXT] Re: [PATCH v3 net 2/2] net: stmmac: dwmac-imx: pause the TXC
> clock in fixed-link
>
> Caution: This is an external email. Please take care when clicking links or
> opening attachments. When in doubt, report the message using the 'Report this
> email' button
>
>
> Hi Shenwei,
>
> thanks for your patch.
>
> On 7/31/23 18:19, Shenwei Wang wrote:
> > When using a fixed-link setup, certain devices like the SJA1105
> > require a small pause in the TXC clock line to enable their internal
> > tunable delay line (TDL).
>
> If this is only required for some devices, is it safe to enforce this behaviour
> unconditionally for any kind of fixed link devices connected to the MX93 EQOS
> or could this possibly break for other devices?
>
It won't impact normal devices. The link layer hasn't built up yet.
Thanks,
Shenwei
> Best regards
> Johannes
>
> >
> > To satisfy this requirement, this patch temporarily disables the TX
> > clock, and restarts it after a required period. This provides the
> > required silent interval on the clock line for SJA1105 to complete the
> > frequency transition and enable the internal TDLs.
> >
> > So far we have only enabled this feature on the i.MX93 platform.
> >
> > Signed-off-by: Shenwei Wang <shenwei.wang@....com>
> > Reviewed-by: Frank Li <frank.li@....com>
> > ---
> > .../net/ethernet/stmicro/stmmac/dwmac-imx.c | 42 +++++++++++++++++++
> > 1 file changed, 42 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
> > b/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
> > index 53ee5a42c071..2e4173d099f3 100644
> > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
> > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
> > @@ -32,6 +32,7 @@
> > #define GPR_ENET_QOS_RGMII_EN (0x1 << 21)
> >
> > #define MX93_GPR_ENET_QOS_INTF_MODE_MASK GENMASK(3, 0)
> > +#define MX93_GPR_ENET_QOS_INTF_MASK GENMASK(3, 1)
> > #define MX93_GPR_ENET_QOS_INTF_SEL_MII (0x0 << 1)
> > #define MX93_GPR_ENET_QOS_INTF_SEL_RMII (0x4 << 1)
> > #define MX93_GPR_ENET_QOS_INTF_SEL_RGMII (0x1 << 1)
> > @@ -40,6 +41,7 @@
> > #define DMA_BUS_MODE 0x00001000
> > #define DMA_BUS_MODE_SFT_RESET (0x1 << 0)
> > #define RMII_RESET_SPEED (0x3 << 14)
> > +#define CTRL_SPEED_MASK GENMASK(15, 14)
> >
> > struct imx_dwmac_ops {
> > u32 addr_width;
> > @@ -56,6 +58,7 @@ struct imx_priv_data {
> > struct regmap *intf_regmap;
> > u32 intf_reg_off;
> > bool rmii_refclk_ext;
> > + void __iomem *base_addr;
> >
> > const struct imx_dwmac_ops *ops;
> > struct plat_stmmacenet_data *plat_dat; @@ -212,6 +215,42 @@
> > static void imx_dwmac_fix_speed(void *priv, uint speed, uint mode)
> > dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
> > }
> >
> > +static void imx_dwmac_fix_speed_mx93(void *priv, uint speed, uint
> > +mode) {
> > + struct imx_priv_data *dwmac = priv;
> > + int ctrl, old_ctrl, iface;
> > +
> > + imx_dwmac_fix_speed(priv, speed, mode);
> > +
> > + if (!dwmac || mode != MLO_AN_FIXED)
> > + return;
> > +
> > + if (regmap_read(dwmac->intf_regmap, dwmac->intf_reg_off, &iface))
> > + return;
> > +
> > + iface &= MX93_GPR_ENET_QOS_INTF_MASK;
> > + if (iface != MX93_GPR_ENET_QOS_INTF_SEL_RGMII)
> > + return;
> > +
> > + old_ctrl = readl(dwmac->base_addr + MAC_CTRL_REG);
> > + ctrl = old_ctrl & ~CTRL_SPEED_MASK;
> > + regmap_update_bits(dwmac->intf_regmap, dwmac->intf_reg_off,
> > + MX93_GPR_ENET_QOS_INTF_MODE_MASK, 0);
> > + writel(ctrl, dwmac->base_addr + MAC_CTRL_REG);
> > +
> > + /* Ensure the settings for CTRL are applied and avoid CPU/Compiler
> > + * reordering.
> > + */
> > + wmb();
> > +
> > + usleep_range(10, 20);
> > + iface |= MX93_GPR_ENET_QOS_CLK_GEN_EN;
> > + regmap_update_bits(dwmac->intf_regmap, dwmac->intf_reg_off,
> > + MX93_GPR_ENET_QOS_INTF_MODE_MASK, iface);
> > +
> > + writel(old_ctrl, dwmac->base_addr + MAC_CTRL_REG); }
> > +
> > static int imx_dwmac_mx93_reset(void *priv, void __iomem *ioaddr)
> > {
> > struct plat_stmmacenet_data *plat_dat = priv; @@ -317,8 +356,11
> > @@ 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;
> > plat_dat->bsp_priv = dwmac;
> > dwmac->plat_dat = plat_dat;
> > + dwmac->base_addr = stmmac_res.addr;
> >
> > ret = imx_dwmac_clks_config(dwmac, true);
> > if (ret)
>
> --
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