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Message-ID: <1652011947-18575-3-git-send-email-quic_kriskura@quicinc.com>
Date: Sun, 8 May 2022 17:42:26 +0530
From: Krishna Kurapati <quic_kriskura@...cinc.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Stephen Boyd <swboyd@...omium.org>,
"Doug Anderson" <dianders@...omium.org>,
Matthias Kaehlcke <mka@...omium.org>,
Wesley Cheng <wcheng@...eaurora.org>
CC: <devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-phy@...ts.infradead.org>, <quic_pkondeti@...cinc.com>,
<quic_ppratap@...cinc.com>, <quic_vpulyala@...cinc.com>,
Krishna Kurapati <quic_kriskura@...cinc.com>
Subject: [v3 2/3] phy: qcom-snps: Add support for overriding phy tuning parameters
Add support for overriding electrical signal tuning parameters for
SNPS HS Phy.
Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
---
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..bed2c90 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)
@@ -60,6 +66,16 @@
#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",
};
@@ -173,10 +189,195 @@ static int qcom_snps_hsphy_set_mode(struct phy *phy, enum phy_mode mode,
return 0;
}
+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, numElements, offset, mask) \
+{ \
+ .param_table = table, \
+ .table_size = numElements, \
+ .reg_offset = offset, \
+ .param_mask = mask, \
+}
+
+static const char *phy_seq_props[] =
+{
+ "qcom,hs-rise-fall-time-bps",
+ "qcom,squelch-detector-bps",
+ "qcom,preemphasis-duration",
+ "qcom,preemphasis-amplitude",
+ "qcom,hs-disconnect-bps",
+ "qcom,hs-amplitude-bps",
+ "qcom,hs-crossover-voltage",
+ "qcom,hs-output-impedance",
+ "qcom,ls-fs-output-impedance-bps",
+};
+
+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 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_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 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(100, 1),
+ OVERRIDE_PARAM(200, 0),
+};
+
+static struct override_param preemphasis_amplitude_sc7280[] = {
+ OVERRIDE_PARAM(100, 1),
+ OVERRIDE_PARAM(200, 2),
+ OVERRIDE_PARAM(300, 3),
+ OVERRIDE_PARAM(400, 0),
+};
+
+static struct override_param hs_crossover_voltage_sc7280[] = {
+ OVERRIDE_PARAM(-31, 1),
+ OVERRIDE_PARAM(28, 2),
+ OVERRIDE_PARAM(0, 3),
+};
+
+static struct override_param hs_output_impedance_sc7280[] = {
+ OVERRIDE_PARAM(-2300, 3),
+ OVERRIDE_PARAM(0, 2),
+ OVERRIDE_PARAM(2600, 1),
+ OVERRIDE_PARAM(6100, 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_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(
+ squelch_det_threshold_sc7280,
+ ARRAY_SIZE(squelch_det_threshold_sc7280),
+ USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X0,
+ SQUELCH_DETECTOR_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_disconnect_sc7280,
+ ARRAY_SIZE(hs_disconnect_sc7280),
+ USB2_PHY_USB_PHY_HS_PHY_OVERRIDE_X0,
+ HS_DISCONNECT_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(
+ 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),
+};
+
+struct phy_override_seq {
+ bool need_update;
+ u8 offset;
+ u8 value;
+ u8 mask;
+};
+
+struct phy_override_seq update_seq_cfg[ARRAY_SIZE(phy_seq_props)];
+
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 +424,12 @@ 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(update_seq_cfg); i++) {
+ if (update_seq_cfg[i].need_update)
+ qcom_snps_hsphy_write_mask(hsphy->base, update_seq_cfg[i].offset,
+ update_seq_cfg[i].mask, update_seq_cfg[i].value);
+ }
+
qcom_snps_hsphy_write_mask(hsphy->base,
USB2_PHY_USB_PHY_HS_PHY_CTRL_COMMON2,
VREGBYPASS, VREGBYPASS);
@@ -280,7 +487,10 @@ 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 +501,43 @@ static const struct dev_pm_ops qcom_snps_hsphy_pm_ops = {
qcom_snps_hsphy_runtime_resume, NULL)
};
+static void hsphy_override_param_update_val(const struct override_param_map map,
+ s32 dt_val, struct phy_override_seq *seq_entry)
+{
+ int i;
+
+ /*
+ * We prepare the param table for each param in increasing order
+ * of dt values. So we need to iterate over the list once to get
+ * the required 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 << __ffs(map.param_mask);
+}
+
+static void phy_read_param_override_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);
+ 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)
+ hsphy_override_param_update_val(cfg[i], val, &update_seq_cfg[i]);
+ }
+}
+
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);
+ phy_read_param_override_seq(dev);
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
if (!IS_ERR(phy_provider))
--
2.7.4
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