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phy: omap-usb2-phy: disable phy charger detect
AM654x PG1.0 has a silicon bug that D+ is pulled high after POR, which could cause enumeration failure with some USB hubs. Disabling the USB2_PHY Charger Detect function will put D+ into the normal state. Using property "ti,dis-chg-det-quirk" in the DT usb2-phy node to enable this workaround for AM654x PG1.0. Signed-off-by: Bin Liu <b-liu@ti.com> Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com> Signed-off-by: Roger Quadros <rogerq@ti.com>
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@ -17,6 +17,7 @@
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#include <linux/err.h>
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#include <linux/err.h>
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#define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT BIT(0)
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#define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT BIT(0)
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#define OMAP_USB2_DISABLE_CHG_DET BIT(1)
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#define OMAP_DEV_PHY_PD BIT(0)
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#define OMAP_DEV_PHY_PD BIT(0)
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#define OMAP_USB2_PHY_PD BIT(28)
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#define OMAP_USB2_PHY_PD BIT(28)
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@ -33,6 +34,10 @@
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#define AM654_USB2_VBUS_DET_EN BIT(5)
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#define AM654_USB2_VBUS_DET_EN BIT(5)
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#define AM654_USB2_VBUSVALID_DET_EN BIT(4)
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#define AM654_USB2_VBUSVALID_DET_EN BIT(4)
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#define USB2PHY_CHRG_DET 0x14
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#define USB2PHY_USE_CHG_DET_REG BIT(29)
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#define USB2PHY_DIS_CHG_DET BIT(28)
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DECLARE_GLOBAL_DATA_PTR;
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DECLARE_GLOBAL_DATA_PTR;
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struct omap_usb2_phy {
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struct omap_usb2_phy {
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@ -160,6 +165,12 @@ static int omap_usb2_phy_init(struct phy *usb_phy)
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writel(val, priv->phy_base + USB2PHY_ANA_CONFIG1);
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writel(val, priv->phy_base + USB2PHY_ANA_CONFIG1);
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}
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}
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if (priv->flags & OMAP_USB2_DISABLE_CHG_DET) {
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val = readl(priv->phy_base + USB2PHY_CHRG_DET);
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val |= USB2PHY_USE_CHG_DET_REG | USB2PHY_DIS_CHG_DET;
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writel(val, priv->phy_base + USB2PHY_CHRG_DET);
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}
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return 0;
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return 0;
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}
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}
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@ -197,13 +208,25 @@ int omap_usb2_phy_probe(struct udevice *dev)
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if (!data)
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if (!data)
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return -EINVAL;
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return -EINVAL;
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if (data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
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priv->phy_base = dev_read_addr_ptr(dev);
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priv->phy_base = dev_read_addr_ptr(dev);
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if (!priv->phy_base)
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if (!priv->phy_base)
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return -EINVAL;
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return -EINVAL;
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if (data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT)
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priv->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
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priv->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
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}
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/*
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* AM654x PG1.0 has a silicon bug that D+ is pulled high after
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* POR, which could cause enumeration failure with some USB hubs.
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* Disabling the USB2_PHY Charger Detect function will put D+
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* into the normal state.
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*
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* Using property "ti,dis-chg-det-quirk" in the DT usb2-phy node
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* to enable this workaround for AM654x PG1.0.
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*/
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if (dev_read_bool(dev, "ti,dis-chg-det-quirk"))
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priv->flags |= OMAP_USB2_DISABLE_CHG_DET;
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regmap = syscon_regmap_lookup_by_phandle(dev, "syscon-phy-power");
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regmap = syscon_regmap_lookup_by_phandle(dev, "syscon-phy-power");
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if (!IS_ERR(regmap)) {
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if (!IS_ERR(regmap)) {
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