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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Maxime Coquelin , Shawn Guo , Sascha Hauer , Neil Armstrong , Kevin Hilman , Vinod Koul , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland Cc: Giuseppe Cavallaro , Alexandre Torgue , Jose Abreu , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Jerome Brunet , Martin Blumenstingl , Bhupesh Sharma , Nobuhiro Iwamatsu , Simon Horman , Andrew Halaney , Bartosz Golaszewski , Shenwei Wang , Wong Vee Khee , Revanth Kumar Uppala , Jochen Henneberg , netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org, imx@lists.linux.dev, Frank Li Subject: [PATCH v5 net-next 2/2] net: stmmac: dwmac-imx: pause the TXC clock in fixed-link Date: Mon, 7 Aug 2023 11:07:16 -0500 Message-Id: <20230807160716.259072-3-shenwei.wang@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230807160716.259072-1-shenwei.wang@nxp.com> References: <20230807160716.259072-1-shenwei.wang@nxp.com> X-ClientProxiedBy: SJ0PR05CA0047.namprd05.prod.outlook.com (2603:10b6:a03:33f::22) To PAXPR04MB9185.eurprd04.prod.outlook.com (2603:10a6:102:231::11) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PAXPR04MB9185:EE_|AM9PR04MB8414:EE_ X-MS-Office365-Filtering-Correlation-Id: 6eca23d8-fcbf-44e3-ee8b-08db976076fc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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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. This action occurs before the link is built up, so it does not impact a normal device too. There is no need to identify if the connected device is an SJA1105 alike or not during the implementation. So far we have only enabled this feature on the i.MX93 platform. Signed-off-by: Shenwei Wang Reviewed-by: Frank Li --- .../net/ethernet/stmicro/stmmac/dwmac-imx.c | 43 +++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c index 3eb6b4457494..43ff19b009d4 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; @@ -47,6 +49,7 @@ struct imx_dwmac_ops { int (*fix_soc_reset)(void *priv, void __iomem *ioaddr); int (*set_intf_mode)(struct plat_stmmacenet_data *plat_dat); + void (*fix_mac_speed)(void *priv, unsigned int speed, unsigned int mode); }; struct imx_priv_data { @@ -56,6 +59,7 @@ 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 +216,41 @@ static void imx_dwmac_fix_speed(void *priv, unsigned int speed, unsigned int mod dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate); } +static void imx93_dwmac_fix_speed(void *priv, unsigned int speed, unsigned int mode) +{ + struct imx_priv_data *dwmac = priv; + unsigned int iface; + int ctrl, old_ctrl; + + 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. */ + readl(dwmac->base_addr + MAC_CTRL_REG); + + 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; @@ -319,6 +358,7 @@ static int imx_dwmac_probe(struct platform_device *pdev) plat_dat->fix_mac_speed = imx_dwmac_fix_speed; 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) @@ -328,6 +368,8 @@ static int imx_dwmac_probe(struct platform_device *pdev) if (ret) goto err_dwmac_init; + if (dwmac->ops->fix_mac_speed) + plat_dat->fix_mac_speed = dwmac->ops->fix_mac_speed; dwmac->plat_dat->fix_soc_reset = dwmac->ops->fix_soc_reset; ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); @@ -364,6 +406,7 @@ static struct imx_dwmac_ops imx93_dwmac_data = { .mac_rgmii_txclk_auto_adj = true, .set_intf_mode = imx93_set_intf_mode, .fix_soc_reset = imx_dwmac_mx93_reset, + .fix_mac_speed = imx93_dwmac_fix_speed, }; static const struct of_device_id imx_dwmac_match[] = {