netdev - Re: [PATCH net-next v2 6/9] net: ethernet: mtk-star-emac: add timing adjustment support

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Date:   Thu, 27 Jan 2022 10:20:29 +0800
From:   Macpaul Lin <macpaul.lin@...iatek.com>
To:     Biao Huang <biao.huang@...iatek.com>,
        David Miller <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        "Fabien Parent" <fparent@...libre.com>
CC:     Jakub Kicinski <kuba@...nel.org>, Felix Fietkau <nbd@....name>,
        "John Crispin" <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Yinghua Pan <ot_yinghua.pan@...iatek.com>,
        <srv_heupstream@...iatek.com>
Subject: Re: [PATCH net-next v2 6/9] net: ethernet: mtk-star-emac: add timing
 adjustment support


On 1/27/22 9:58 AM, Biao Huang wrote:
> Add simple clock inversion for timing adjustment in driver.
> Add property "mediatek,txc-inverse" or "mediatek,rxc-inverse" to
> device node when necessary.
> 
> Signed-off-by: Biao Huang <biao.huang@...iatek.com>
> Signed-off-by: Yinghua Pan <ot_yinghua.pan@...iatek.com>
> ---
>   drivers/net/ethernet/mediatek/mtk_star_emac.c | 34 +++++++++++++++++++
>   1 file changed, 34 insertions(+)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_star_emac.c b/drivers/net/ethernet/mediatek/mtk_star_emac.c
> index d69f75661e75..d5e974e0db6d 100644
> --- a/drivers/net/ethernet/mediatek/mtk_star_emac.c
> +++ b/drivers/net/ethernet/mediatek/mtk_star_emac.c
> @@ -131,6 +131,11 @@ static const char *const mtk_star_clk_names[] = { "core", "reg", "trans" };
>   #define MTK_STAR_REG_INT_MASK			0x0054
>   #define MTK_STAR_BIT_INT_MASK_FNRC		BIT(6)
>   
> +/* Delay-Macro Register */
> +#define MTK_STAR_REG_TEST0			0x0058
> +#define MTK_STAR_BIT_INV_RX_CLK			BIT(30)
> +#define MTK_STAR_BIT_INV_TX_CLK			BIT(31)
> +
>   /* Misc. Config Register */
>   #define MTK_STAR_REG_TEST1			0x005c
>   #define MTK_STAR_BIT_TEST1_RST_HASH_MBIST	BIT(31)
> @@ -268,6 +273,8 @@ struct mtk_star_priv {
>   	int duplex;
>   	int pause;
>   	bool rmii_rxc;
> +	bool rx_inv;
> +	bool tx_inv;
>   
>   	const struct mtk_star_compat *compat_data;
>   
> @@ -1450,6 +1457,25 @@ static void mtk_star_clk_disable_unprepare(void *data)
>   	clk_bulk_disable_unprepare(MTK_STAR_NCLKS, priv->clks);
>   }
>   
> +static int mtk_star_set_timing(struct mtk_star_priv *priv)
> +{
> +	struct device *dev = mtk_star_get_dev(priv);
> +	unsigned int delay_val = 0;
> +
> +	switch (priv->phy_intf) {
> +	case PHY_INTERFACE_MODE_RMII:
> +		delay_val |= FIELD_PREP(MTK_STAR_BIT_INV_RX_CLK, priv->rx_inv);
> +		delay_val |= FIELD_PREP(MTK_STAR_BIT_INV_TX_CLK, priv->tx_inv);
> +		break;
> +	default:
> +		dev_err(dev, "This interface not supported\n");
> +		return -EINVAL;
> +	}
> +
> +	regmap_write(priv->regs, MTK_STAR_REG_TEST0, delay_val);
> +
> +	return 0;
> +}
>   static int mtk_star_probe(struct platform_device *pdev)
>   {
>   	struct device_node *of_node;
> @@ -1532,6 +1558,8 @@ static int mtk_star_probe(struct platform_device *pdev)
>   	}
>   
>   	priv->rmii_rxc = of_property_read_bool(of_node, "mediatek,rmii-rxc");
> +	priv->rx_inv = of_property_read_bool(of_node, "mediatek,rxc-inverse");
> +	priv->tx_inv = of_property_read_bool(of_node, "mediatek,txc-inverse");
>   
>   	if (priv->compat_data->set_interface_mode) {
>   		ret = priv->compat_data->set_interface_mode(ndev);
> @@ -1541,6 +1569,12 @@ static int mtk_star_probe(struct platform_device *pdev)
>   		}
>   	}
>   
> +	ret = mtk_star_set_timing(priv);
> +	if (ret) {
> +		dev_err(dev, "Failed to set timing, err = %d\n", ret);
> +		return -EINVAL;
> +	}
> +
>   	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
>   	if (ret) {
>   		dev_err(dev, "unsupported DMA mask\n");
> 

Reviewed-by: Macpaul Lin <macpaul.lin@...iatek.com>

Regards,
Macpaul Lin