[PATCH v12 2/3] phy: qcom-snps: Add support for overriding phy tuning parameters
From: Krishna Kurapati
Date: Tue Sep 06 2022 - 12:51:26 EST
Add support for overriding electrical signal tuning parameters for
SNPS HS Phy.
Signed-off-by: Krishna Kurapati <quic_kriskura@xxxxxxxxxxx>
---
drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c | 252 +++++++++++++++++++++++++-
1 file changed, 250 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..7a0d01c 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 +66,47 @@
#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_val;
+};
+
+struct override_param_map {
+ const char *prop_name;
+ const struct override_param *param_table;
+ u8 table_size;
+ u8 reg_offset;
+ u8 param_mask;
+};
+
+struct phy_override_seq {
+ bool need_update;
+ u8 offset;
+ u8 value;
+ u8 mask;
+};
+
+#define NUM_HSPHY_TUNING_PARAMS (9)
+
/**
* struct qcom_snps_hsphy - snps hs phy attributes
*
@@ -91,6 +132,7 @@ struct qcom_snps_hsphy {
bool phy_initialized;
enum phy_mode mode;
+ struct phy_override_seq update_seq_cfg[NUM_HSPHY_TUNING_PARAMS];
};
static inline void qcom_snps_hsphy_write_mask(void __iomem *base, u32 offset,
@@ -173,10 +215,158 @@ static int qcom_snps_hsphy_set_mode(struct phy *phy, enum phy_mode mode,
return 0;
}
+static const struct override_param hs_disconnect_sc7280[] = {
+ { -272, 0 },
+ { 0, 1 },
+ { 317, 2 },
+ { 630, 3 },
+ { 973, 4 },
+ { 1332, 5 },
+ { 1743, 6 },
+ { 2156, 7 },
+};
+
+static const struct override_param squelch_det_threshold_sc7280[] = {
+ { -2090, 7 },
+ { -1560, 6 },
+ { -1030, 5 },
+ { -530, 4 },
+ { 0, 3 },
+ { 530, 2 },
+ { 1060, 1 },
+ { 1590, 0 },
+};
+
+static const struct override_param hs_amplitude_sc7280[] = {
+ { -660, 0 },
+ { -440, 1 },
+ { -220, 2 },
+ { 0, 3 },
+ { 230, 4 },
+ { 440, 5 },
+ { 650, 6 },
+ { 890, 7 },
+ { 1110, 8 },
+ { 1330, 9 },
+ { 1560, 10 },
+ { 1780, 11 },
+ { 2000, 12 },
+ { 2220, 13 },
+ { 2430, 14 },
+ { 2670, 15 },
+};
+
+static const struct override_param preemphasis_duration_sc7280[] = {
+ { 10000, 1 },
+ { 20000, 0 },
+};
+
+static const struct override_param preemphasis_amplitude_sc7280[] = {
+ { 10000, 1 },
+ { 20000, 2 },
+ { 30000, 3 },
+ { 40000, 0 },
+};
+
+static const struct override_param hs_rise_fall_time_sc7280[] = {
+ { -4100, 3 },
+ { 0, 2 },
+ { 2810, 1 },
+ { 5430, 0 },
+};
+
+static const struct override_param hs_crossover_voltage_sc7280[] = {
+ { -31000, 1 },
+ { 0, 3 },
+ { 28000, 2 },
+};
+
+static const struct override_param hs_output_impedance_sc7280[] = {
+ { -2300000, 3 },
+ { 0, 2 },
+ { 2600000, 1 },
+ { 6100000, 0 },
+};
+
+static const struct override_param ls_fs_output_impedance_sc7280[] = {
+ { -1053, 15 },
+ { -557, 7 },
+ { 0, 3 },
+ { 612, 1 },
+ { 1310, 0 },
+};
+
+static const struct override_param_map sc7280_snps_7nm_phy[] = {
+ {
+ "qcom,hs-disconnect-bp",
+ hs_disconnect_sc7280,
+ ARRAY_SIZE(hs_disconnect_sc7280),
+ USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X0,
+ HS_DISCONNECT_MASK
+ },
+ {
+ "qcom,squelch-detector-bp",
+ squelch_det_threshold_sc7280,
+ ARRAY_SIZE(squelch_det_threshold_sc7280),
+ USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X0,
+ SQUELCH_DETECTOR_MASK
+ },
+ {
+ "qcom,hs-amplitude-bp",
+ hs_amplitude_sc7280,
+ ARRAY_SIZE(hs_amplitude_sc7280),
+ USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X1,
+ HS_AMPLITUDE_MASK
+ },
+ {
+ "qcom,pre-emphasis-duration-bp",
+ preemphasis_duration_sc7280,
+ ARRAY_SIZE(preemphasis_duration_sc7280),
+ USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X1,
+ PREEMPHASIS_DURATION_MASK,
+ },
+ {
+ "qcom,pre-emphasis-amplitude-bp",
+ preemphasis_amplitude_sc7280,
+ ARRAY_SIZE(preemphasis_amplitude_sc7280),
+ USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X1,
+ PREEMPHASIS_AMPLITUDE_MASK,
+ },
+ {
+ "qcom,hs-rise-fall-time-bp",
+ hs_rise_fall_time_sc7280,
+ ARRAY_SIZE(hs_rise_fall_time_sc7280),
+ USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X2,
+ HS_RISE_FALL_MASK
+ },
+ {
+ "qcom,hs-crossover-voltage-microvolt",
+ hs_crossover_voltage_sc7280,
+ ARRAY_SIZE(hs_crossover_voltage_sc7280),
+ USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X2,
+ HS_CROSSOVER_VOLTAGE_MASK
+ },
+ {
+ "qcom,hs-output-impedance-micro-ohms",
+ hs_output_impedance_sc7280,
+ ARRAY_SIZE(hs_output_impedance_sc7280),
+ USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X2,
+ HS_OUTPUT_IMPEDANCE_MASK,
+ },
+ {
+ "qcom,ls-fs-output-impedance-bp",
+ 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 +413,14 @@ 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 +478,10 @@ 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_snps_7nm_phy,
+ },
{ .compatible = "qcom,usb-snps-femto-v2-phy", },
{ }
};
@@ -291,6 +492,52 @@ 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 matches the dt value and pick
+ * up the corresponding register 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_val << __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;
+ const struct override_param_map *cfg = of_device_get_match_data(dev);
+
+ hsphy = dev_get_drvdata(dev);
+
+ for (i = 0; cfg[i].prop_name != NULL; i++) {
+ ret = of_property_read_s32(node, cfg[i].prop_name, &val);
+ if (ret)
+ continue;
+
+ qcom_snps_hsphy_override_param_update_val(cfg[i], val,
+ &hsphy->update_seq_cfg[i]);
+ dev_dbg(&hsphy->phy->dev, "Read param: %s dt_val: %d reg_val: 0x%x\n",
+ cfg[i].prop_name, val, hsphy->update_seq_cfg[i].value);
+
+ }
+}
+
static int qcom_snps_hsphy_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -352,6 +599,7 @@ 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