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phy: omap-usb2-phy: disable phy charger detect

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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>
This commit is contained in:
Bin Liu 2020-06-03 14:46:22 +03:00 committed by Lokesh Vutla
parent 94e837b6fc
commit 5b9ee0fc6f
1 changed files with 28 additions and 5 deletions
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33
drivers/phy/omap-usb2-phy.c
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@ -17,6 +17,7 @@
#include <linux/err.h>
#define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT BIT(0)
#define OMAP_USB2_DISABLE_CHG_DET BIT(1)
#define OMAP_DEV_PHY_PD BIT(0)
#define OMAP_USB2_PHY_PD BIT(28)
@ -33,6 +34,10 @@
#define AM654_USB2_VBUS_DET_EN BIT(5)
#define AM654_USB2_VBUSVALID_DET_EN BIT(4)
#define USB2PHY_CHRG_DET 0x14
#define USB2PHY_USE_CHG_DET_REG BIT(29)
#define USB2PHY_DIS_CHG_DET BIT(28)
DECLARE_GLOBAL_DATA_PTR;
struct omap_usb2_phy {
@ -160,6 +165,12 @@ static int omap_usb2_phy_init(struct phy *usb_phy)
writel(val, priv->phy_base + USB2PHY_ANA_CONFIG1);
}
if (priv->flags & OMAP_USB2_DISABLE_CHG_DET) {
val = readl(priv->phy_base + USB2PHY_CHRG_DET);
val |= USB2PHY_USE_CHG_DET_REG | USB2PHY_DIS_CHG_DET;
writel(val, priv->phy_base + USB2PHY_CHRG_DET);
}
return 0;
}
@ -197,13 +208,25 @@ int omap_usb2_phy_probe(struct udevice *dev)
if (!data)
return -EINVAL;
if (data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
priv->phy_base = dev_read_addr_ptr(dev);
priv->phy_base = dev_read_addr_ptr(dev);
if (!priv->phy_base)
return -EINVAL;
if (!priv->phy_base)
return -EINVAL;
if (data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT)
priv->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
}
/*
* 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.
*/
if (dev_read_bool(dev, "ti,dis-chg-det-quirk"))
priv->flags |= OMAP_USB2_DISABLE_CHG_DET;
regmap = syscon_regmap_lookup_by_phandle(dev, "syscon-phy-power");
if (!IS_ERR(regmap)) {