Program USB2 pad PD controls during port connect/disconnect, port suspend/resume, to reduce power consumption on disconnect or suspend. Signed-off-by: Jim Lin <jilin@xxxxxxxxxx> --- drivers/usb/host/xhci-tegra.c | 130 +++++++++++++++++++++++++++++++++- 1 file changed, 129 insertions(+), 1 deletion(-) diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c index 1ed46642abd5..9ebd68373bd5 100644 --- a/drivers/usb/host/xhci-tegra.c +++ b/drivers/usb/host/xhci-tegra.c @@ -189,6 +189,13 @@ struct tegra_xusb_context_soc { } fpci; }; +enum tegra_xhci_phy_type { + USB3_PHY, + USB2_PHY, + HSIC_PHY, + MAX_PHY_TYPES, +}; + struct tegra_xusb_soc { const char *firmware; const char * const *supply_names; @@ -274,9 +281,17 @@ struct tegra_xusb { bool suspended; struct tegra_xusb_context context; + u32 enable_utmi_pad_after_lp0_exit; }; static struct hc_driver __read_mostly tegra_xhci_hc_driver; +static int (*original_xhci_hub_control)(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex, + char *buf, u16 wLength); + +static inline struct tegra_xusb *hcd_to_tegra_xusb(struct usb_hcd *hcd) +{ + return (struct tegra_xusb *) dev_get_drvdata(hcd->self.controller); +} static inline u32 fpci_readl(struct tegra_xusb *tegra, unsigned int offset) { @@ -1949,12 +1964,27 @@ static void tegra_xhci_enable_phy_sleepwalk_wake(struct tegra_xusb *tegra) static void tegra_xhci_disable_phy_wake(struct tegra_xusb *tegra) { struct tegra_xusb_padctl *padctl = tegra->padctl; - unsigned int i; + unsigned int i, j; for (i = 0; i < tegra->num_phys; i++) { if (!tegra->phys[i]) continue; + if (tegra_xusb_padctl_remote_wake_detected(padctl, tegra->phys[i])) { + if (i < (tegra->soc->ports.usb3.offset + tegra->soc->ports.usb3.count)) { + j = i; + } else if (i < (tegra->soc->ports.usb2.offset + + tegra->soc->ports.usb2.count)) { + j = i - tegra->soc->ports.usb2.offset; + tegra_phy_xusb_utmi_pad_power_on(tegra->phys[i]); + } else { + j = i - (tegra->soc->ports.usb2.offset + + tegra->soc->ports.usb2.count); + } + dev_dbg(tegra->dev, + "%s port %u (0 based) remote wake detected\n", + dev_name(&tegra->phys[i]->dev), j); + } tegra_xusb_padctl_disable_phy_wake(padctl, tegra->phys[i]); } } @@ -1972,6 +2002,22 @@ static void tegra_xhci_disable_phy_sleepwalk(struct tegra_xusb *tegra) } } +static void tegra_xhci_program_utmi_power_lp0_exit(struct tegra_xusb *tegra) +{ + unsigned int i; + + for (i = 0; i < tegra->soc->ports.usb2.count; i++) { + if (!is_host_mode_phy(tegra, USB2_PHY, i)) + continue; + if (tegra->enable_utmi_pad_after_lp0_exit & BIT(i)) + tegra_phy_xusb_utmi_pad_power_on( + tegra->phys[tegra->soc->ports.usb2.offset + i]); + else + tegra_phy_xusb_utmi_pad_power_down( + tegra->phys[tegra->soc->ports.usb2.offset + i]); + } +} + static int tegra_xusb_enter_elpg(struct tegra_xusb *tegra, bool runtime) { struct xhci_hcd *xhci = hcd_to_xhci(tegra->hcd); @@ -1980,6 +2026,7 @@ static int tegra_xusb_enter_elpg(struct tegra_xusb *tegra, bool runtime) unsigned int i; int err; u32 usbcmd; + u32 portsc; dev_dbg(dev, "entering ELPG\n"); @@ -1993,6 +2040,15 @@ static int tegra_xusb_enter_elpg(struct tegra_xusb *tegra, bool runtime) goto out; } + for (i = 0; i < tegra->soc->ports.usb2.count; i++) { + if (!xhci->usb2_rhub.ports[i]) + continue; + portsc = readl(xhci->usb2_rhub.ports[i]->addr); + tegra->enable_utmi_pad_after_lp0_exit &= ~BIT(i); + if (((portsc & PORT_PLS_MASK) == XDEV_U3) || ((portsc & DEV_SPEED_MASK) == XDEV_FS)) + tegra->enable_utmi_pad_after_lp0_exit |= BIT(i); + } + err = xhci_suspend(xhci, wakeup); if (err < 0) { dev_err(tegra->dev, "failed to suspend XHCI: %d\n", err); @@ -2066,6 +2122,8 @@ static int tegra_xusb_exit_elpg(struct tegra_xusb *tegra, bool runtime) phy_power_on(tegra->phys[i]); } + if (tegra->suspended) + tegra_xhci_program_utmi_power_lp0_exit(tegra); tegra_xusb_config(tegra); tegra_xusb_restore_context(tegra); @@ -2437,6 +2495,74 @@ static int tegra_xhci_setup(struct usb_hcd *hcd) return xhci_gen_setup(hcd, tegra_xhci_quirks); } +static int tegra_xhci_hub_control(struct usb_hcd *hcd, u16 type_req, u16 value, u16 index, + char *buf, u16 length) +{ + struct tegra_xusb *tegra = hcd_to_tegra_xusb(hcd); + struct xhci_hcd *xhci = hcd_to_xhci(hcd); + struct xhci_hub *rhub; + struct xhci_bus_state *bus_state; + int port = (index & 0xff) - 1; + int port_index; + struct xhci_port **ports; + u32 portsc; + int ret; + + rhub = &xhci->usb2_rhub; + bus_state = &rhub->bus_state; + if (bus_state->resuming_ports && hcd->speed == HCD_USB2) { + ports = rhub->ports; + port_index = rhub->num_ports; + while (port_index--) { + if (!test_bit(port_index, &bus_state->resuming_ports)) + continue; + portsc = readl(ports[port_index]->addr); + if ((portsc & PORT_PLS_MASK) == XDEV_RESUME) + tegra_phy_xusb_utmi_pad_power_on( + tegra->phys[tegra->soc->ports.usb2.offset + port_index]); + } + } + + if (hcd->speed == HCD_USB2) { + port_index = tegra->soc->ports.usb2.offset + port; + if ((type_req == ClearPortFeature) && (value == USB_PORT_FEAT_SUSPEND)) + tegra_phy_xusb_utmi_pad_power_on(tegra->phys[port_index]); + if ((type_req == SetPortFeature) && (value == USB_PORT_FEAT_RESET)) { + ports = rhub->ports; + portsc = readl(ports[port]->addr); + if (portsc & PORT_CONNECT) + tegra_phy_xusb_utmi_pad_power_on(tegra->phys[port_index]); + } + } + + ret = (*original_xhci_hub_control)(hcd, type_req, value, index, buf, length); + if (ret < 0) + return ret; + + if (hcd->speed == HCD_USB2) { + if ((type_req == SetPortFeature) && (value == USB_PORT_FEAT_SUSPEND)) + /* We don't suspend the PAD while HNP role swap happens on the OTG port */ + if (!((hcd->self.otg_port == (port + 1)) && hcd->self.b_hnp_enable)) + tegra_phy_xusb_utmi_pad_power_down(tegra->phys[port_index]); + + if ((type_req == ClearPortFeature) && (value == USB_PORT_FEAT_C_CONNECTION)) { + ports = rhub->ports; + portsc = readl(ports[port]->addr); + if (!(portsc & PORT_CONNECT)) { + /* We don't suspend the PAD while HNP role swap happens on the OTG + * port + */ + if (!((hcd->self.otg_port == (port + 1)) && hcd->self.b_hnp_enable)) + tegra_phy_xusb_utmi_pad_power_down(tegra->phys[port_index]); + } + } + if ((type_req == SetPortFeature) && (value == USB_PORT_FEAT_TEST)) + tegra_phy_xusb_utmi_pad_power_on(tegra->phys[port_index]); + } + + return ret; +} + static const struct xhci_driver_overrides tegra_xhci_overrides __initconst = { .reset = tegra_xhci_setup, }; @@ -2444,6 +2570,8 @@ static const struct xhci_driver_overrides tegra_xhci_overrides __initconst = { static int __init tegra_xusb_init(void) { xhci_init_driver(&tegra_xhci_hc_driver, &tegra_xhci_overrides); + original_xhci_hub_control = tegra_xhci_hc_driver.hub_control; + tegra_xhci_hc_driver.hub_control = tegra_xhci_hub_control; return platform_driver_register(&tegra_xusb_driver); } -- 2.17.1