Re: [PATCH v2 2/2] phy: intel-lgm-emmc: Add support for eMMC PHY
On 20/8/2019 9:59 PM, Andy Shevchenko wrote: On Tue, Aug 20, 2019 at 04:56:02PM +0300, Andy Shevchenko wrote: On Tue, Aug 20, 2019 at 06:31:33PM +0800, Ramuthevar,Vadivel MuruganX wrote: +#define DR_TY_50OHM(x) ((~(x) << 28) & DR_TY_MASK) For consistency it should be #define DR_TY_SHIFT(x) (((x) << 28) & DR_TY_MASK) with explanation about 50 Ohm in the code below. + /* Drive impedance: 50 Ohm */ Nice, you have already a comment here. Just use DR_TY_SHIFT(1) It should be DR_TY_SHIFT(6) now since I dropped the negation. Thanks Andy, will update the review comments. Best Regards Vadivel
Re: [PATCH v2 2/2] phy: intel-lgm-emmc: Add support for eMMC PHY
On 20/8/2019 9:56 PM, Andy Shevchenko wrote: On Tue, Aug 20, 2019 at 06:31:33PM +0800, Ramuthevar,Vadivel MuruganX wrote: From: Ramuthevar Vadivel Murugan Add support for eMMC PHY on Intel's Lightning Mountain SoC. Thanks for an update. Looks better though several minor comments below. Thanks a lot! Andy, for the review comments. +/* eMMC phy register definitions */ +#define EMMC_PHYCTRL0_REG 0xa8 +#define DR_TY_MASK GENMASK(30, 28) +#define DR_TY_50OHM(x) ((~(x) << 28) & DR_TY_MASK) For consistency it should be #define DR_TY_SHIFT(x) (((x) << 28) & DR_TY_MASK) with explanation about 50 Ohm in the code below. +#define OTAPDLYENA BIT(14) +#define OTAPDLYSEL_MASKGENMASK(13, 10) +#define OTAPDLYSEL_SHIFT(x)(((x) << 10) & OTAPDLYSEL_MASK) + +#define EMMC_PHYCTRL1_REG 0xac +#define PDB_MASK BIT(0) +#define ENDLL_MASK BIT(7) +#define ENDLL_VAL BIT(7) Again, inconsistency here, #define ENDLL_SHIFT(x) (((x) << 7) & ENDLL_MASK) Agreed +#define EMMC_PHYCTRL2_REG 0xb0 +#define FRQSEL_25M 0 +#define FRQSEL_150M3 +#define FRQSEL_MASKGENMASK(24, 22) +#define FRQSEL_SHIFT(x)((x) << 22) And here #define FRQSEL_SHIFT(x) (((x) << 22) & FRQSEL_MASK) Agreed + /* +* According to the user manual, calpad calibration +* cycle takes more than 2us without the minimal recommended +* value, so we may need a little margin here +*/ + usleep_range(3, 6); Actually for this low values it's recommended to use udelay() disregard to context. udelay(5); Agreed + regmap_update_bits(priv->syscfg, EMMC_PHYCTRL1_REG, PDB_MASK, 1); 1 looks like a magic that has to be changed in the same way as for the rest, i.e. #define PDB_SHIFT(x)(((x) << 0) & PDB_MASK) ..., PDB_MASK, PDB_SHIFT(1)... Agreed +static int intel_emmc_phy_power_on(struct phy *phy) +{ + struct intel_emmc_phy *priv = phy_get_drvdata(phy); + int ret; + + /* Drive impedance: 50 Ohm */ Nice, you have already a comment here. Just use DR_TY_SHIFT(1) + ret = regmap_update_bits(priv->syscfg, EMMC_PHYCTRL0_REG, DR_TY_MASK, +DR_TY_50OHM(1)); + ret = regmap_update_bits(priv->syscfg, EMMC_PHYCTRL0_REG, OTAPDLYENA, +0x0); 0x0 -> 0 Noted +static int intel_emmc_phy_probe(struct platform_device *pdev) +{ + struct device *dev = >dev; + struct intel_emmc_phy *priv; + struct phy *generic_phy; + struct phy_provider *phy_provider; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + /* Get eMMC phy (accessed via chiptop) regmap */ + priv->syscfg = syscon_regmap_lookup_by_phandle(dev->of_node, + "intel,syscon"); Perhaps struct device_node *np = dev->of_node; ... priv->syscfg = syscon_regmap_lookup_by_phandle(np, "intel,syscon"); + generic_phy = devm_phy_create(dev, dev->of_node, ); And here. Noted, will update With Best Regards Vadivel
Re: [PATCH v2 2/2] phy: intel-lgm-emmc: Add support for eMMC PHY
On Tue, Aug 20, 2019 at 04:56:02PM +0300, Andy Shevchenko wrote: > On Tue, Aug 20, 2019 at 06:31:33PM +0800, Ramuthevar,Vadivel MuruganX wrote: > > +#define DR_TY_50OHM(x) ((~(x) << 28) & DR_TY_MASK) > > For consistency it should be > > #define DR_TY_SHIFT(x)(((x) << 28) & DR_TY_MASK) > > with explanation about 50 Ohm in the code below. > > + /* Drive impedance: 50 Ohm */ > > Nice, you have already a comment here. Just use DR_TY_SHIFT(1) It should be DR_TY_SHIFT(6) now since I dropped the negation. -- With Best Regards, Andy Shevchenko
Re: [PATCH v2 2/2] phy: intel-lgm-emmc: Add support for eMMC PHY
On Tue, Aug 20, 2019 at 06:31:33PM +0800, Ramuthevar,Vadivel MuruganX wrote: > From: Ramuthevar Vadivel Murugan > > Add support for eMMC PHY on Intel's Lightning Mountain SoC. Thanks for an update. Looks better though several minor comments below. > +/* eMMC phy register definitions */ > +#define EMMC_PHYCTRL0_REG0xa8 > +#define DR_TY_MASK GENMASK(30, 28) > +#define DR_TY_50OHM(x) ((~(x) << 28) & DR_TY_MASK) For consistency it should be #define DR_TY_SHIFT(x) (((x) << 28) & DR_TY_MASK) with explanation about 50 Ohm in the code below. > +#define OTAPDLYENA BIT(14) > +#define OTAPDLYSEL_MASK GENMASK(13, 10) > +#define OTAPDLYSEL_SHIFT(x) (((x) << 10) & OTAPDLYSEL_MASK) > + > +#define EMMC_PHYCTRL1_REG0xac > +#define PDB_MASK BIT(0) > +#define ENDLL_MASK BIT(7) > +#define ENDLL_VALBIT(7) Again, inconsistency here, #define ENDLL_SHIFT(x) (((x) << 7) & ENDLL_MASK) > +#define EMMC_PHYCTRL2_REG0xb0 > +#define FRQSEL_25M 0 > +#define FRQSEL_150M 3 > +#define FRQSEL_MASK GENMASK(24, 22) > +#define FRQSEL_SHIFT(x) ((x) << 22) And here #define FRQSEL_SHIFT(x) (((x) << 22) & FRQSEL_MASK) > + /* > + * According to the user manual, calpad calibration > + * cycle takes more than 2us without the minimal recommended > + * value, so we may need a little margin here > + */ > + usleep_range(3, 6); Actually for this low values it's recommended to use udelay() disregard to context. udelay(5); > + regmap_update_bits(priv->syscfg, EMMC_PHYCTRL1_REG, PDB_MASK, 1); 1 looks like a magic that has to be changed in the same way as for the rest, i.e. #define PDB_SHIFT(x)(((x) << 0) & PDB_MASK) ..., PDB_MASK, PDB_SHIFT(1)... > +static int intel_emmc_phy_power_on(struct phy *phy) > +{ > + struct intel_emmc_phy *priv = phy_get_drvdata(phy); > + int ret; > + > + /* Drive impedance: 50 Ohm */ Nice, you have already a comment here. Just use DR_TY_SHIFT(1) > + ret = regmap_update_bits(priv->syscfg, EMMC_PHYCTRL0_REG, DR_TY_MASK, > + DR_TY_50OHM(1)); > + ret = regmap_update_bits(priv->syscfg, EMMC_PHYCTRL0_REG, OTAPDLYENA, > + 0x0); 0x0 -> 0 > +static int intel_emmc_phy_probe(struct platform_device *pdev) > +{ > + struct device *dev = >dev; > + struct intel_emmc_phy *priv; > + struct phy *generic_phy; > + struct phy_provider *phy_provider; > + > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + /* Get eMMC phy (accessed via chiptop) regmap */ > + priv->syscfg = syscon_regmap_lookup_by_phandle(dev->of_node, > +"intel,syscon"); Perhaps struct device_node *np = dev->of_node; ... priv->syscfg = syscon_regmap_lookup_by_phandle(np, "intel,syscon"); > + generic_phy = devm_phy_create(dev, dev->of_node, ); And here. -- With Best Regards, Andy Shevchenko