linux-kernel - Re: [PATCH v7 3/3] phy: intel: Add driver support for ComboPhy

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Message-ID: <f12e76ac-e0fd-4afa-e1cd-2b90f175adfd@linux.intel.com>
Date:   Mon, 4 May 2020 16:26:25 +0800
From:   Dilip Kota <eswara.kota@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kishon@...com,
        devicetree@...r.kernel.org, lee.jones@...aro.org, arnd@...db.de,
        robh@...nel.org, andriy.shevchenko@...el.com,
        cheol.yong.kim@...el.com, chuanhua.lei@...ux.intel.com,
        qi-ming.wu@...el.com, yixin.zhu@...el.com
Subject: Re: [PATCH v7 3/3] phy: intel: Add driver support for ComboPhy


On 5/4/2020 3:29 PM, Vinod Koul wrote:
> On 30-04-20, 15:15, Dilip Kota wrote:
>
>> +enum {
>> +	PHY_0,
>> +	PHY_1,
>> +	PHY_MAX_NUM
> PHY_MAX_NUM = PHY_1?
Driver is using it for no. of PHYs/maximum PHY id.

Code snippets:

struct intel_combo_phy {
...
         struct reset_control    *phy_rst;
         struct reset_control    *core_rst;
         struct intel_cbphy_iphy iphy[PHY_MAX_NUM];
...
}

....

static int intel_cbphy_create(struct intel_combo_phy *cbphy)
{
         struct phy_provider *phy_provider;
         struct device *dev = cbphy->dev;
         struct intel_cbphy_iphy *iphy;
         int i;

         for (i = 0; i < PHY_MAX_NUM; i++) {

...

>
>> +static inline void combo_phy_w32_off_mask(void __iomem *base, unsigned int reg,
>> +					  u32 mask, u32 val)
>> +{
>> +	u32 reg_val;
>> +
>> +	reg_val = readl(base + reg);
>> +	reg_val &= ~mask;
>> +	reg_val |= FIELD_PREP(mask, val);
>> +	writel(reg_val, base + reg);
> bypassing regmap here... why?
It is not regmap address, one of the below two addresses are passed to 
this function.

struct intel_combo_phy {
...
         void __iomem            *app_base;
         void __iomem            *cr_base;
...
}


>
>> +static int intel_cbphy_calibrate(struct phy *phy)
>> +{
>> +	struct intel_cbphy_iphy *iphy = phy_get_drvdata(phy);
>> +	struct intel_combo_phy *cbphy = iphy->parent;
>> +	void __iomem *cr_base = cbphy->cr_base;
>> +	int val, ret, id;
>> +
>> +	if (cbphy->phy_mode != PHY_XPCS_MODE)
>> +		return 0;
>> +
>> +	id = PHY_ID(iphy);
>> +
>> +	/* trigger auto RX adaptation */
>> +	combo_phy_w32_off_mask(cr_base, CR_ADDR(PCS_XF_ATE_OVRD_IN_2, id),
>> +			       ADAPT_REQ_MSK, 3);
>> +	/* Wait RX adaptation to finish */
>> +	ret = readl_poll_timeout(cr_base + CR_ADDR(PCS_XF_RX_ADAPT_ACK, id),
>> +				 val, val & RX_ADAPT_ACK_BIT, 10, 5000);
>> +	if (ret)
>> +		dev_err(cbphy->dev, "RX Adaptation failed!\n");
> you want to continue her and not return error?

Next step is stopping the Adaptation, it should be done in both error 
and success case.

Regards,
Dilip