linux-kernel - Re: [PATCH v2 2/2] phy: socionext: Add UniPhier AHCI PHY driver support

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Message-ID: <20200713050527.GR34333@vkoul-mobl>
Date:   Mon, 13 Jul 2020 10:35:27 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/2] phy: socionext: Add UniPhier AHCI PHY driver
 support

On 30-06-20, 17:59, Kunihiko Hayashi wrote:

> +++ b/drivers/phy/socionext/phy-uniphier-ahci.c
> @@ -0,0 +1,335 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * phy-uniphier-ahci.c - PHY driver for UniPhier AHCI controller
> + * Copyright 2016-2018, Socionext Inc.

we are in 2020 now!

> +static int uniphier_ahciphy_pxs2_power_on(struct uniphier_ahciphy_priv *priv)
> +{
> +	int ret;
> +	u32 val;
> +
> +	/* enable reference clock for PHY */
> +	val = readl(priv->base + CKCTRL);
> +	val |= CKCTRL_REF_SSP_EN;
> +	writel(val, priv->base + CKCTRL);
> +
> +	/* release port reset */
> +	val = readl(priv->base + CKCTRL);
> +	val &= ~CKCTRL_P0_RESET;
> +	writel(val, priv->base + CKCTRL);
> +
> +	/* wait until PLL is ready */
> +	if (priv->data->is_ready_high)
> +		ret = readl_poll_timeout(priv->base + CKCTRL, val,
> +					 (val & CKCTRL_P0_READY), 200, 400);
> +	else
> +		ret = readl_poll_timeout(priv->base + CKCTRL, val,
> +					 !(val & CKCTRL_P0_READY), 200, 400);
> +	if (ret) {
> +		dev_err(priv->dev, "Failed to check whether PHY PLL is ready\n");
> +		goto out_disable_clock;
> +	}
> +
> +	return 0;
> +
> +out_disable_clock:
> +	/* assert port reset */
> +	val = readl(priv->base + CKCTRL);
> +	val |= CKCTRL_P0_RESET;
> +	writel(val, priv->base + CKCTRL);
> +
> +	/* disable reference clock for PHY */
> +	val = readl(priv->base + CKCTRL);
> +	val &= ~CKCTRL_REF_SSP_EN;
> +	writel(val, priv->base + CKCTRL);

this seems to be repeated patter, why not add a modifyl() helper here..

> +static int uniphier_ahciphy_pxs3_init(struct uniphier_ahciphy_priv *priv)
> +{
> +	int i;
> +	u32 val;
> +
> +	/* setup port parameter */
> +	val = readl(priv->base + TXCTRL0);
> +	val &= ~TXCTRL0_AMP_G3_MASK;
> +	val |= FIELD_PREP(TXCTRL0_AMP_G3_MASK, 0x73);
> +	val &= ~TXCTRL0_AMP_G2_MASK;
> +	val |= FIELD_PREP(TXCTRL0_AMP_G2_MASK, 0x46);
> +	val &= ~TXCTRL0_AMP_G1_MASK;
> +	val |= FIELD_PREP(TXCTRL0_AMP_G1_MASK, 0x42);
> +	writel(val, priv->base + TXCTRL0);
> +
> +	val = readl(priv->base + TXCTRL1);
> +	val &= ~TXCTRL1_DEEMPH_G3_MASK;
> +	val |= FIELD_PREP(TXCTRL1_DEEMPH_G3_MASK, 0x23);
> +	val &= ~TXCTRL1_DEEMPH_G2_MASK;
> +	val |= FIELD_PREP(TXCTRL1_DEEMPH_G2_MASK, 0x05);
> +	val &= ~TXCTRL1_DEEMPH_G1_MASK;
> +	val |= FIELD_PREP(TXCTRL1_DEEMPH_G1_MASK, 0x05);
> +
> +	val = readl(priv->base + RXCTRL);
> +	val &= ~RXCTRL_LOS_LVL_MASK;
> +	val |= FIELD_PREP(RXCTRL_LOS_LVL_MASK, 0x9);
> +	val &= ~RXCTRL_LOS_BIAS_MASK;
> +	val |= FIELD_PREP(RXCTRL_LOS_BIAS_MASK, 0x2);
> +	val &= ~RXCTRL_RX_EQ_MASK;
> +	val |= FIELD_PREP(RXCTRL_RX_EQ_MASK, 0x1);
> +
> +	/* dummy read 25 times */

why?

> +static int uniphier_ahciphy_init(struct phy *phy)
> +{
> +	struct uniphier_ahciphy_priv *priv = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = clk_prepare_enable(priv->clk_parent);
> +	if (ret)
> +		return ret;
> +
> +	ret = reset_control_deassert(priv->rst_parent);
> +	if (ret)
> +		goto out_clk_disable;
> +
> +	if (priv->data->init) {
> +		ret = priv->data->init(priv);
> +		if (ret)
> +			goto out_rst_assert;
> +	}
> +
> +	return ret;

return 0?

> +static const struct uniphier_ahciphy_soc_data uniphier_pxs2_data = {
> +	.init = NULL,

Isn't this superfluous ?
-- 
~Vinod