linux-kernel - Re: [PATCH v12 2/2] phy: samsung-ufs: add UFS PHY driver for samsung SoC

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Message-ID: <20200713061737.GD34333@vkoul-mobl>
Date:   Mon, 13 Jul 2020 11:47:37 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Alim Akhtar <alim.akhtar@...sung.com>
Cc:     robh+dt@...nel.org, krzk@...nel.org, kwmad.kim@...sung.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        kishon@...com
Subject: Re: [PATCH v12 2/2] phy: samsung-ufs: add UFS PHY driver for samsung
 SoC

On 03-07-20, 22:41, Alim Akhtar wrote:

> +static const struct samsung_ufs_phy_cfg exynos7_post_init_cfg[] = {
> +	END_UFS_PHY_CFG
> +};

This is dummy, why not add a check to make config optional?

> +static int samsung_ufs_phy_symbol_clk_init(struct samsung_ufs_phy *phy)
> +{
> +	int ret = 0;

superfluous init, am sure I flagged it before as well

> +
> +	phy->tx0_symbol_clk = devm_clk_get(phy->dev, "tx0_symbol_clk");
> +	if (IS_ERR(phy->tx0_symbol_clk)) {
> +		dev_err(phy->dev, "failed to get tx0_symbol_clk clock\n");
> +		goto out;
> +	}
> +
> +	phy->rx0_symbol_clk = devm_clk_get(phy->dev, "rx0_symbol_clk");
> +	if (IS_ERR(phy->rx0_symbol_clk)) {
> +		dev_err(phy->dev, "failed to get rx0_symbol_clk clock\n");
> +		goto out;
> +	}
> +
> +	phy->rx1_symbol_clk = devm_clk_get(phy->dev, "rx1_symbol_clk");
> +	if (IS_ERR(phy->rx0_symbol_clk)) {
> +		dev_err(phy->dev, "failed to get rx1_symbol_clk clock\n");
> +		goto out;
> +	}
> +
> +	ret = clk_prepare_enable(phy->tx0_symbol_clk);
> +	if (ret) {
> +		dev_err(phy->dev, "%s: tx0_symbol_clk enable failed %d\n", __func__, ret);
> +		goto out;
> +	}
> +
> +	ret = clk_prepare_enable(phy->rx0_symbol_clk);
> +	if (ret) {
> +		dev_err(phy->dev, "%s: rx0_symbol_clk enable failed %d\n", __func__, ret);
> +		clk_disable_unprepare(phy->tx0_symbol_clk);
> +		goto out;
> +	}
> +
> +	ret = clk_prepare_enable(phy->rx1_symbol_clk);
> +	if (ret) {
> +		dev_err(phy->dev, "%s: rx1_symbol_clk enable failed %d\n", __func__, ret);
> +		clk_disable_unprepare(phy->tx0_symbol_clk);
> +		clk_disable_unprepare(phy->rx0_symbol_clk);

maybe it will look better if we add common rollback and jump to proper
labels

> +static int samsung_ufs_phy_clks_init(struct samsung_ufs_phy *phy)
> +{
> +	int ret;
> +
> +	phy->ref_clk = devm_clk_get(phy->dev, "ref_clk");
> +	if (IS_ERR(phy->ref_clk))
> +		dev_err(phy->dev, "failed to get ref_clk clock\n");
> +
> +	ret = clk_prepare_enable(phy->ref_clk);
> +	if (ret) {
> +		dev_err(phy->dev, "%s: ref_clk enable failed %d\n", __func__, ret);
> +		return ret;
> +	}
> +
> +	dev_info(phy->dev, "UFS MPHY ref_clk_rate = %ld\n", clk_get_rate(phy->ref_clk));

debug pls

> +static int samsung_ufs_phy_init(struct phy *phy)
> +{
> +	struct samsung_ufs_phy *_phy = get_samsung_ufs_phy(phy);

ss_phy perhaps?

> +	int ret;
> +
> +	_phy->lane_cnt = phy->attrs.bus_width;
> +	_phy->ufs_phy_state = CFG_PRE_INIT;
> +
> +	if (_phy->drvdata->has_symbol_clk) {
> +		ret = samsung_ufs_phy_symbol_clk_init(_phy);
> +		if (ret)
> +			dev_err(_phy->dev, "failed to set ufs phy symbol clocks\n");
> +	}
> +
> +	ret = samsung_ufs_phy_clks_init(_phy);
> +	if (ret)
> +		dev_err(_phy->dev, "failed to set ufs phy  clocks\n");
> +
> +	samsung_ufs_phy_calibrate(phy);
> +
> +	return 0;

not return samsung_ufs_phy_calibrate() ?
-- 
~Vinod