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

[Dilip Kota]

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 {
...
ÂÂÂÂÂÂÂ struct reset_controlÂÂÂ *phy_rst;
ÂÂÂÂÂÂÂ struct reset_controlÂÂÂ *core_rst;
ÂÂÂÂÂÂÂ struct intel_cbphy_iphy iphy[PHY_MAX_NUM];
...
}

....

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

ÂÂÂÂÂÂÂ 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 {
...
ÂÂÂÂÂÂÂ void __iomemÂÂÂÂÂÂÂÂÂÂÂ *app_base;
ÂÂÂÂÂÂÂ void __iomemÂÂÂÂÂÂÂÂÂÂÂ *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