netdev - Re: [PATCH v5 2/2] net: stmmac: dwmac-imx: use platform specific reset for imx93 SoCs

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Date:   Mon, 3 Apr 2023 21:51:32 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Shenwei Wang <shenwei.wang@....com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Wong Vee Khee <veekhee@...le.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Mohammad Athari Bin Ismail <mohammad.athari.ismail@...el.com>,
        Andrey Konovalov <andrey.konovalov@...aro.org>,
        Jochen Henneberg <jh@...neberg-systemdesign.com>,
        Tan Tee Min <tee.min.tan@...ux.intel.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com, imx@...ts.linux.dev
Subject: Re: [PATCH v5 2/2] net: stmmac: dwmac-imx: use platform specific
 reset for imx93 SoCs

On Mon, Apr 03, 2023 at 10:24:08AM -0500, Shenwei Wang wrote:
> The patch addresses an issue with the reset logic on the i.MX93 SoC, which
> requires configuration of the correct interface speed under RMII mode to
> complete the reset. The patch implements a fix_soc_reset function and uses
> it specifically for the i.MX93 SoCs.
> 
> Reviewed-by: Fabio Estevam <festevam@...il.com>
> Signed-off-by: Shenwei Wang <shenwei.wang@....com>
> ---
>  .../net/ethernet/stmicro/stmmac/dwmac-imx.c   | 27 +++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
> index 2a2be65d65a0..465de3392e4e 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
> @@ -37,10 +37,15 @@
>  #define MX93_GPR_ENET_QOS_INTF_SEL_RGMII	(0x1 << 1)
>  #define MX93_GPR_ENET_QOS_CLK_GEN_EN		(0x1 << 0)
>  
> +#define DMA_BUS_MODE			0x00001000
> +#define DMA_BUS_MODE_SFT_RESET		(0x1 << 0)
> +#define RMII_RESET_SPEED		(0x3 << 14)
> +
>  struct imx_dwmac_ops {
>  	u32 addr_width;
>  	bool mac_rgmii_txclk_auto_adj;
>  
> +	int (*fix_soc_reset)(void *priv, void __iomem *ioaddr);
>  	int (*set_intf_mode)(struct plat_stmmacenet_data *plat_dat);
>  };
>  
> @@ -207,6 +212,25 @@ static void imx_dwmac_fix_speed(void *priv, unsigned int speed)
>  		dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
>  }
>  
> +static int imx_dwmac_mx93_reset(void *priv, void __iomem *ioaddr)
> +{
> +	u32 value = readl(ioaddr + DMA_BUS_MODE);
> +	struct plat_stmmacenet_data *plat_dat = priv;
> +

nit: reverse xmas tree - longest line to shortest - for local variable
     declarations.

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