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SubjectRe: [PATCH v8 2/3] phy: qcom-snps: Add support for overriding phy tuning parameters
On 01-06-22, 12:26, Krishna Kurapati wrote:
> Add support for overriding electrical signal tuning parameters for
> SNPS HS Phy.
>
> Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
> Reviewed-by: Pavankumar Kondeti <quic_pkondeti@quicinc.com>
> ---
> drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c | 267 +++++++++++++++++++++++++-
> 1 file changed, 265 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..14bbb06 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)

I guess this is a register, pls remove blank lines between them, serves
no purpose

> +
> +#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)

here two..

> +
> +

One line suffices here (checkpatch with --strict would have warned you)


> 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)\
> +{ \

this should be in preceding line

> + .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-ohms",
> + "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),
> +};

use constants for registers please

> +
> +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),
> +};
> +
> 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 +510,49 @@ 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;
> + }
> +
> + 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);

okay am nor sure I get the idea, if we have values in DT why do we need
these table in driver or vice-versa?


> +}
> +
> +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;
> + const struct override_param_map *cfg = of_device_get_match_data(dev);
> +
> + hsphy = dev_get_drvdata(dev);
> +
> + for (i = 0; i < ARRAY_SIZE(phy_seq_props); i++) {
> + ret = of_property_read_s32(node, phy_seq_props[i], &val);
> + if (!ret) {
> + dev_dbg(&hsphy->phy->dev, "Read param: %s val: %d\n",
> + phy_seq_props[i], val);
> + qcom_snps_hsphy_override_param_update_val(cfg[i], val,
> + &hsphy->update_seq_cfg[i]);
> + }
> + }
> +}
> +
> static int qcom_snps_hsphy_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -352,6 +614,7 @@ static int qcom_snps_hsphy_probe(struct platform_device *pdev)
>
> dev_set_drvdata(dev, hsphy);
> phy_set_drvdata(generic_phy, hsphy);
> + qcom_snps_hsphy_read_override_param_seq(dev);
>
> phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> if (!IS_ERR(phy_provider))
> --
> 2.7.4
>
>
> --
> linux-phy mailing list
> linux-phy@lists.infradead.org
> https://lists.infradead.org/mailman/listinfo/linux-phy

--
~Vinod

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