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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.

This addresses Silicon Errata:
i2075 - "USB2PHY: USB2PHY Charger Detect is Enabled by Default Without VBUS
Presence"

Signed-off-by: Roger Quadros <rogerq@ti.com>
Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
Link: https://lore.kernel.org/r/20200824075127.14902-2-rogerq@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Roger Quadros 2020-08-24 10:51:26 +03:00 committed by Vinod Koul
parent afd55e6d1b
commit ad7a7acaed
1 changed files with 40 additions and 7 deletions
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47
drivers/phy/ti/phy-omap-usb2.c
View File

@ -22,10 +22,15 @@
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/of_platform.h>
#include <linux/sys_soc.h>
#define USB2PHY_ANA_CONFIG1 0x4c
#define USB2PHY_DISCON_BYP_LATCH BIT(31)
#define USB2PHY_CHRG_DET 0x14
#define USB2PHY_CHRG_DET_USE_CHG_DET_REG BIT(29)
#define USB2PHY_CHRG_DET_DIS_CHG_DET BIT(28)
/* SoC Specific USB2_OTG register definitions */
#define AM654_USB2_OTG_PD BIT(8)
#define AM654_USB2_VBUS_DET_EN BIT(5)
@ -43,6 +48,7 @@
#define OMAP_USB2_HAS_START_SRP BIT(0)
#define OMAP_USB2_HAS_SET_VBUS BIT(1)
#define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT BIT(2)
#define OMAP_USB2_DISABLE_CHRG_DET BIT(3)
struct omap_usb {
struct usb_phy phy;
@ -236,6 +242,13 @@ static int omap_usb_init(struct phy *x)
omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
}
if (phy->flags & OMAP_USB2_DISABLE_CHRG_DET) {
val = omap_usb_readl(phy->phy_base, USB2PHY_CHRG_DET);
val |= USB2PHY_CHRG_DET_USE_CHG_DET_REG |
USB2PHY_CHRG_DET_DIS_CHG_DET;
omap_usb_writel(phy->phy_base, USB2PHY_CHRG_DET, val);
}
return 0;
}
@ -329,6 +342,26 @@ static const struct of_device_id omap_usb2_id_table[] = {
};
MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
static void omap_usb2_init_errata(struct omap_usb *phy)
{
static const struct soc_device_attribute am65x_sr10_soc_devices[] = {
{ .family = "AM65X", .revision = "SR1.0" },
{ /* sentinel */ }
};
/*
* Errata i2075: USB2PHY: USB2PHY Charger Detect is Enabled by
* Default Without VBUS Presence.
*
* AM654x SR1.0 has a silicon bug due to which 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.
*/
if (soc_device_match(am65x_sr10_soc_devices))
phy->flags |= OMAP_USB2_DISABLE_CHRG_DET;
}
static int omap_usb2_probe(struct platform_device *pdev)
{
struct omap_usb *phy;
@ -366,14 +399,14 @@ static int omap_usb2_probe(struct platform_device *pdev)
phy->mask = phy_data->mask;
phy->power_on = phy_data->power_on;
phy->power_off = phy_data->power_off;
phy->flags = phy_data->flags;
if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(phy->phy_base))
return PTR_ERR(phy->phy_base);
phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
}
omap_usb2_init_errata(phy);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(phy->phy_base))
return PTR_ERR(phy->phy_base);
phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
"syscon-phy-power");