| Message ID | 1652723410-1630-1-git-send-email-quic_kriskura@quicinc.com |
|---|---|
| Headers | show |
| Series | Add QCOM SNPS PHY overriding params support | expand |
Hi Krishna, The patch looks good to me. Minor comments below. On Mon, May 16, 2022 at 11:20:09PM +0530, Krishna Kurapati wrote: > Add support for overriding electrical signal tuning parameters for > SNPS HS Phy. > > Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com> > --- > drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c | 268 +++++++++++++++++++++++++- > 1 file changed, 266 insertions(+), 2 deletions(-) > > diff --git a/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c b/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c > index 5d20378..fa60e8d 100644 > --- a/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c > +++ b/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c > @@ -52,6 +52,12 @@ > #define USB2_SUSPEND_N BIT(2) > #define USB2_SUSPEND_N_SEL BIT(3) > > +#define USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X0 (0x6c) > +#define USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X1 (0x70) > +#define USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X2 (0x74) > +#define USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X3 (0x78) > +#define PARAM_OVRD_MASK 0xFF > + > #define USB2_PHY_USB_PHY_CFG0 (0x94) > #define UTMI_PHY_DATAPATH_CTRL_OVERRIDE_EN BIT(0) > #define UTMI_PHY_CMN_CTRL_OVERRIDE_EN BIT(1) > @@ -60,12 +66,76 @@ > #define REFCLK_SEL_MASK GENMASK(1, 0) > #define REFCLK_SEL_DEFAULT (0x2 << 0) > > +#define HS_DISCONNECT_MASK GENMASK(2, 0) > + > +#define SQUELCH_DETECTOR_MASK GENMASK(7, 5) > + > +#define HS_AMPLITUDE_MASK GENMASK(3, 0) > + > +#define PREEMPHASIS_DURATION_MASK BIT(5) > + > +#define PREEMPHASIS_AMPLITUDE_MASK GENMASK(7, 6) > + > +#define HS_RISE_FALL_MASK GENMASK(1, 0) > + > +#define HS_CROSSOVER_VOLTAGE_MASK GENMASK(3, 2) > + > +#define HS_OUTPUT_IMPEDANCE_MASK GENMASK(5, 4) > + > +#define LS_FS_OUTPUT_IMPEDANCE_MASK GENMASK(3, 0) > + > + > static const char * const qcom_snps_hsphy_vreg_names[] = { > "vdda-pll", "vdda33", "vdda18", > }; > > #define SNPS_HS_NUM_VREGS ARRAY_SIZE(qcom_snps_hsphy_vreg_names) > > +struct override_param { > + s32 value; > + u8 reg; > +}; > + > +#define OVERRIDE_PARAM(bps, val)\ > +{ \ > + .value = bps, \ > + .reg = val, \ > +} > + > +struct override_param_map { > + struct override_param *param_table; > + u8 table_size; > + u8 reg_offset; > + u8 param_mask; > +}; > + > +#define OVERRIDE_PARAM_MAP(table, num_elements, offset, mask) \ > +{ \ > + .param_table = table, \ > + .table_size = num_elements, \ > + .reg_offset = offset, \ > + .param_mask = mask, \ > +} > + > +struct phy_override_seq { > + bool need_update; > + u8 offset; > + u8 value; > + u8 mask; > +}; > + > +static const char *phy_seq_props[] = { > + "qcom,hs-disconnect-bp", > + "qcom,squelch-detector-bp", > + "qcom,hs-amplitude-bp", > + "qcom,pre-emphasis-duration-bp", > + "qcom,pre-emphasis-amplitude-bp", > + "qcom,hs-rise-fall-time-bp", > + "qcom,hs-crossover-voltage-microvolt", > + "qcom,hs-output-impedance-micro-ohm", > + "qcom,ls-fs-output-impedance-bp", > +}; > + > /** > * struct qcom_snps_hsphy - snps hs phy attributes > * > @@ -91,6 +161,7 @@ struct qcom_snps_hsphy { > > bool phy_initialized; > enum phy_mode mode; > + struct phy_override_seq update_seq_cfg[ARRAY_SIZE(phy_seq_props)]; > }; > > static inline void qcom_snps_hsphy_write_mask(void __iomem *base, u32 offset, > @@ -173,10 +244,147 @@ static int qcom_snps_hsphy_set_mode(struct phy *phy, enum phy_mode mode, > return 0; > } > > +static struct override_param hs_disconnect_sc7280[] = { > + OVERRIDE_PARAM(-272, 0), > + OVERRIDE_PARAM(0, 1), > + OVERRIDE_PARAM(317, 2), > + OVERRIDE_PARAM(630, 3), > + OVERRIDE_PARAM(973, 4), > + OVERRIDE_PARAM(1332, 5), > + OVERRIDE_PARAM(1743, 6), > + OVERRIDE_PARAM(2156, 7), > +}; > + > +static struct override_param squelch_det_threshold_sc7280[] = { > + OVERRIDE_PARAM(-2090, 7), > + OVERRIDE_PARAM(-1560, 6), > + OVERRIDE_PARAM(-1030, 5), > + OVERRIDE_PARAM(-530, 4), > + OVERRIDE_PARAM(0, 3), > + OVERRIDE_PARAM(530, 2), > + OVERRIDE_PARAM(1060, 1), > + OVERRIDE_PARAM(1590, 0), > +}; > + > +static struct override_param hs_amplitude_sc7280[] = { > + OVERRIDE_PARAM(-660, 0), > + OVERRIDE_PARAM(-440, 1), > + OVERRIDE_PARAM(-220, 2), > + OVERRIDE_PARAM(0, 3), > + OVERRIDE_PARAM(230, 4), > + OVERRIDE_PARAM(440, 5), > + OVERRIDE_PARAM(650, 6), > + OVERRIDE_PARAM(890, 7), > + OVERRIDE_PARAM(1110, 8), > + OVERRIDE_PARAM(1330, 9), > + OVERRIDE_PARAM(1560, 10), > + OVERRIDE_PARAM(1780, 11), > + OVERRIDE_PARAM(2000, 12), > + OVERRIDE_PARAM(2220, 13), > + OVERRIDE_PARAM(2430, 14), > + OVERRIDE_PARAM(2670, 15), > +}; > + > +static struct override_param preemphasis_duration_sc7280[] = { > + OVERRIDE_PARAM(10000, 1), > + OVERRIDE_PARAM(20000, 0), > +}; > + > +static struct override_param preemphasis_amplitude_sc7280[] = { > + OVERRIDE_PARAM(10000, 1), > + OVERRIDE_PARAM(20000, 2), > + OVERRIDE_PARAM(30000, 3), > + OVERRIDE_PARAM(40000, 0), > +}; > + > +static struct override_param hs_rise_fall_time_sc7280[] = { > + OVERRIDE_PARAM(-4100, 3), > + OVERRIDE_PARAM(0, 2), > + OVERRIDE_PARAM(2810, 1), > + OVERRIDE_PARAM(5430, 0), > +}; > + > +static struct override_param hs_crossover_voltage_sc7280[] = { > + OVERRIDE_PARAM(-31000, 1), > + OVERRIDE_PARAM(0, 3), > + OVERRIDE_PARAM(28000, 2), > +}; > + > +static struct override_param hs_output_impedance_sc7280[] = { > + OVERRIDE_PARAM(-2300000, 3), > + OVERRIDE_PARAM(0, 2), > + OVERRIDE_PARAM(2600000, 1), > + OVERRIDE_PARAM(6100000, 0), > +}; > + > +static struct override_param ls_fs_output_impedance_sc7280[] = { > + OVERRIDE_PARAM(-1053, 15), > + OVERRIDE_PARAM(-557, 7), > + OVERRIDE_PARAM(0, 3), > + OVERRIDE_PARAM(612, 1), > + OVERRIDE_PARAM(1310, 0), > +}; > + > +struct override_param_map sc7280_idp[] = { > + OVERRIDE_PARAM_MAP( > + hs_disconnect_sc7280, > + ARRAY_SIZE(hs_disconnect_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X0, > + HS_DISCONNECT_MASK), > + > + OVERRIDE_PARAM_MAP( > + squelch_det_threshold_sc7280, > + ARRAY_SIZE(squelch_det_threshold_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X0, > + SQUELCH_DETECTOR_MASK), > + > + OVERRIDE_PARAM_MAP( > + hs_amplitude_sc7280, > + ARRAY_SIZE(hs_amplitude_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X1, > + HS_AMPLITUDE_MASK), > + > + OVERRIDE_PARAM_MAP( > + preemphasis_duration_sc7280, > + ARRAY_SIZE(preemphasis_duration_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X1, > + PREEMPHASIS_DURATION_MASK), > + > + OVERRIDE_PARAM_MAP( > + preemphasis_amplitude_sc7280, > + ARRAY_SIZE(preemphasis_amplitude_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X1, > + PREEMPHASIS_AMPLITUDE_MASK), > + > + OVERRIDE_PARAM_MAP( > + hs_rise_fall_time_sc7280, > + ARRAY_SIZE(hs_rise_fall_time_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X2, > + HS_RISE_FALL_MASK), > + > + OVERRIDE_PARAM_MAP( > + hs_crossover_voltage_sc7280, > + ARRAY_SIZE(hs_crossover_voltage_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X2, > + HS_CROSSOVER_VOLTAGE_MASK), > + > + OVERRIDE_PARAM_MAP( > + hs_output_impedance_sc7280, > + ARRAY_SIZE(hs_output_impedance_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X2, > + HS_OUTPUT_IMPEDANCE_MASK), > + > + OVERRIDE_PARAM_MAP( > + ls_fs_output_impedance_sc7280, > + ARRAY_SIZE(ls_fs_output_impedance_sc7280), > + USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X3, > + LS_FS_OUTPUT_IMPEDANCE_MASK), > +}; > + I have cross checked with data book. All the values are looking good. > static int qcom_snps_hsphy_init(struct phy *phy) > { > struct qcom_snps_hsphy *hsphy = phy_get_drvdata(phy); > - int ret; > + int ret, i; > > dev_vdbg(&phy->dev, "%s(): Initializing SNPS HS phy\n", __func__); > > @@ -223,6 +431,14 @@ static int qcom_snps_hsphy_init(struct phy *phy) > qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_HS_PHY_CTRL1, > VBUSVLDEXT0, VBUSVLDEXT0); > > + for (i = 0; i < ARRAY_SIZE(hsphy->update_seq_cfg); i++) { > + if (hsphy->update_seq_cfg[i].need_update) > + qcom_snps_hsphy_write_mask(hsphy->base, > + hsphy->update_seq_cfg[i].offset, > + hsphy->update_seq_cfg[i].mask, > + hsphy->update_seq_cfg[i].value); > + } > + > qcom_snps_hsphy_write_mask(hsphy->base, > USB2_PHY_USB_PHY_HS_PHY_CTRL_COMMON2, > VREGBYPASS, VREGBYPASS); > @@ -280,7 +496,10 @@ static const struct phy_ops qcom_snps_hsphy_gen_ops = { > static const struct of_device_id qcom_snps_hsphy_of_match_table[] = { > { .compatible = "qcom,sm8150-usb-hs-phy", }, > { .compatible = "qcom,usb-snps-hs-5nm-phy", }, > - { .compatible = "qcom,usb-snps-hs-7nm-phy", }, > + { > + .compatible = "qcom,usb-snps-hs-7nm-phy", > + .data = &sc7280_idp, > + }, > { .compatible = "qcom,usb-snps-femto-v2-phy", }, > { } > }; > @@ -291,6 +510,50 @@ static const struct dev_pm_ops qcom_snps_hsphy_pm_ops = { > qcom_snps_hsphy_runtime_resume, NULL) > }; > > +static void qcom_snps_hsphy_override_param_update_val( > + const struct override_param_map map, > + s32 dt_val, struct phy_override_seq *seq_entry) > +{ > + int i; > + > + /* > + * Param table for each param is in increasing order > + * of dt values. We need to iterate over the list to > + * select the entry that has equal or the next highest value. > + */ > + for (i = 0 ; i < map.table_size-1; i++) { > + if (map.param_table[i].value >= dt_val) > + break; > + } Minor nit pick: for (i = 0; i < map.table_size - 1; i++) No space is needed before ; added spaces around the - operator. > + > + seq_entry->need_update = true; > + seq_entry->offset = map.reg_offset; > + seq_entry->mask = map.param_mask; > + seq_entry->value = map.param_table[i].reg << __ffs(map.param_mask); > +} > + > +static void qcom_snps_hsphy_read_override_param_seq(struct device *dev) > +{ > + struct device_node *node = dev->of_node; > + s32 val; > + int ret, i; > + struct qcom_snps_hsphy *hsphy; > + struct override_param_map *cfg = > + (struct override_param_map *) of_device_get_match_data(dev); Like I said before, no explicit conversion needed here. also it should be declared const like below const struct override_param_map *cfg = of_device_get_match_data(dev); Thanks, Pavan
On 16/05/2022 19:50, Krishna Kurapati wrote: > Added support for overriding tuning parameters in QCOM SNPS PHY > from device tree. This parameter tuning is required to tune the > hs signal on dp/dm lines for electrical compliance to be successful. I commented at your v4 - please use proper PATCH subject. It is added automatically (with version) for example by git format-patch. Your mails escape regular filters - any reason why doing like that? More difficult for reviewers? Best regards, Krzysztof
Added support for overriding tuning parameters in QCOM SNPS PHY from device tree. This parameter tuning is required to tune the hs signal on dp/dm lines for electrical compliance to be successful. changes in v5: Fixed nitpicks in code. Added minimum and maximum for each parameter added in dt-bindings. Added proper suffixes to each parameter as per dtschema. changes in v4: Fixed nitpicks in code. Initial compliance test results showed overshoot in the middle of eye diagram. The current dt values were put in place to correct it and fix overshoot issue. changes in v3: Added support for phy tuning parameters to be represented in bps and corresponding register values to be written are obtained by traversing through data map declared in the driver. changes in v2: Reading the individual fields in each overriding register from device tree. Krishna Kurapati (2): phy: qcom-snps: Add support for overriding phy tuning parameters arm64: dts: qcom: sc7280: Update SNPS Phy params for SC7280 IDP device Sandeep Maheswaram (1): dt-bindings: phy: qcom,usb-snps-femto-v2: Add phy override params bindings .../bindings/phy/qcom,usb-snps-femto-v2.yaml | 105 ++++++++ arch/arm64/boot/dts/qcom/sc7280-idp.dtsi | 6 + drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c | 268 ++++++++++++++++++++- 3 files changed, 377 insertions(+), 2 deletions(-)