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Date: Fri, 11 Nov 2022 18:18:13 +0800
From: Jim Lin <jilin@...dia.com>
To: <thierry.reding@...il.com>, <gregkh@...uxfoundation.org>,
<jonathanh@...dia.com>
CC: <mathias.nyman@...el.com>, <linux-usb@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
"Petlozu Pravareshwar" <petlozup@...dia.com>,
Jim Lin <jilin@...dia.com>
Subject: [PATCH v7 3/3] xhci: tegra: USB2 pad power controls
From: Petlozu Pravareshwar <petlozup@...dia.com>
Program USB2 pad PD controls during port connect/disconnect, port
suspend/resume, and test mode, to reduce power consumption on
disconnect or suspend.
Signed-off-by: Petlozu Pravareshwar <petlozup@...dia.com>
Co-developed-by: Jim Lin <jilin@...dia.com>
Signed-off-by: Jim Lin <jilin@...dia.com>
---
v2: Fix issue that wrong tegra->phys[] may be accessed on tegra124
v3: No change on copyright
v4: Remove hcd_to_tegra_xusb() function which is used only once.
v5: Update .hub_control in tegra_xhci_overrides (xhci-tegra.c)
Invoke xhci_hub_control() directly (xhci-tegra.c)
v6: Change author to Petlozu
Changed from u32 to u8 for variable enable_utmi_pad_after_lp0_exit
Modified tegra_xhci_disable_phy_wake(), tegra_xhci_program_utmi_power_lp0_exit(),
tegra_xhci_hub_control()
v7: no change
drivers/usb/host/xhci-tegra.c | 125 ++++++++++++++++++++++++++++++++++
1 file changed, 125 insertions(+)
diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
index c8af2cd2216d..b5ed06ddbbac 100644
--- a/drivers/usb/host/xhci-tegra.c
+++ b/drivers/usb/host/xhci-tegra.c
@@ -274,6 +274,7 @@ struct tegra_xusb {
bool suspended;
struct tegra_xusb_context context;
+ u8 lp0_utmi_pad_mask;
};
static struct hc_driver __read_mostly tegra_xhci_hc_driver;
@@ -1951,10 +1952,24 @@ static void tegra_xhci_disable_phy_wake(struct tegra_xusb *tegra)
struct tegra_xusb_padctl *padctl = tegra->padctl;
unsigned int i;
+ for (i = 0; i < tegra->num_usb_phys; i++) {
+ struct phy *phy = tegra_xusb_get_phy(tegra, "usb2", i);
+
+ if (!phy)
+ continue;
+
+ if (tegra_xusb_padctl_remote_wake_detected(padctl, phy))
+ tegra_phy_xusb_utmi_pad_power_on(phy);
+ }
+
for (i = 0; i < tegra->num_phys; i++) {
if (!tegra->phys[i])
continue;
+ if (tegra_xusb_padctl_remote_wake_detected(padctl, tegra->phys[i]))
+ dev_dbg(tegra->dev, "%pOF remote wake detected\n",
+ tegra->phys[i]->dev.of_node);
+
tegra_xusb_padctl_disable_phy_wake(padctl, tegra->phys[i]);
}
}
@@ -1972,6 +1987,28 @@ 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, index_to_usb2;
+ struct phy *phy;
+
+ for (i = 0; i < tegra->soc->num_types; i++) {
+ if (strcmp(tegra->soc->phy_types[i].name, "usb2") == 0)
+ index_to_usb2 = i;
+ }
+
+ for (i = 0; i < tegra->num_usb_phys; i++) {
+ if (!is_host_mode_phy(tegra, index_to_usb2, i))
+ continue;
+
+ phy = tegra_xusb_get_phy(tegra, "usb2", i);
+ if (tegra->lp0_utmi_pad_mask & BIT(i))
+ tegra_phy_xusb_utmi_pad_power_on(phy);
+ else
+ tegra_phy_xusb_utmi_pad_power_down(phy);
+ }
+}
+
static int tegra_xusb_enter_elpg(struct tegra_xusb *tegra, bool runtime)
{
struct xhci_hcd *xhci = hcd_to_xhci(tegra->hcd);
@@ -1980,6 +2017,7 @@ 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 +2031,15 @@ static int tegra_xusb_enter_elpg(struct tegra_xusb *tegra, bool runtime)
goto out;
}
+ for (i = 0; i < tegra->num_usb_phys; i++) {
+ if (!xhci->usb2_rhub.ports[i])
+ continue;
+ portsc = readl(xhci->usb2_rhub.ports[i]->addr);
+ tegra->lp0_utmi_pad_mask &= ~BIT(i);
+ if (((portsc & PORT_PLS_MASK) == XDEV_U3) || ((portsc & DEV_SPEED_MASK) == XDEV_FS))
+ tegra->lp0_utmi_pad_mask |= BIT(i);
+ }
+
err = xhci_suspend(xhci, wakeup);
if (err < 0) {
dev_err(tegra->dev, "failed to suspend XHCI: %d\n", err);
@@ -2066,6 +2113,8 @@ 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);
@@ -2437,8 +2486,84 @@ 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 = dev_get_drvdata(hcd->self.controller);
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ struct xhci_hub *rhub;
+ struct xhci_bus_state *bus_state;
+ int port = (index & 0xff) - 1;
+ unsigned int i;
+ struct xhci_port **ports;
+ u32 portsc;
+ int ret;
+ struct phy *phy;
+
+ rhub = &xhci->usb2_rhub;
+ bus_state = &rhub->bus_state;
+ if (bus_state->resuming_ports && hcd->speed == HCD_USB2) {
+ ports = rhub->ports;
+ i = rhub->num_ports;
+ while (i--) {
+ if (!test_bit(i, &bus_state->resuming_ports))
+ continue;
+ portsc = readl(ports[i]->addr);
+ if ((portsc & PORT_PLS_MASK) == XDEV_RESUME)
+ tegra_phy_xusb_utmi_pad_power_on(
+ tegra_xusb_get_phy(tegra, "usb2", (int) i));
+ }
+ }
+
+ if (hcd->speed == HCD_USB2) {
+ phy = tegra_xusb_get_phy(tegra, "usb2", port);
+ if ((type_req == ClearPortFeature) && (value == USB_PORT_FEAT_SUSPEND)) {
+ if (!index || index > rhub->num_ports)
+ return -EPIPE;
+ tegra_phy_xusb_utmi_pad_power_on(phy);
+ }
+ if ((type_req == SetPortFeature) && (value == USB_PORT_FEAT_RESET)) {
+ if (!index || index > rhub->num_ports)
+ return -EPIPE;
+ ports = rhub->ports;
+ portsc = readl(ports[port]->addr);
+ if (portsc & PORT_CONNECT)
+ tegra_phy_xusb_utmi_pad_power_on(phy);
+ }
+ }
+
+ ret = xhci_hub_control(hcd, type_req, value, index, buf, length);
+ if (ret < 0)
+ return ret;
+
+ if (hcd->speed == HCD_USB2) {
+ /* Use phy where we set previously */
+ 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(phy);
+
+ 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(phy);
+ }
+ }
+ if ((type_req == SetPortFeature) && (value == USB_PORT_FEAT_TEST))
+ tegra_phy_xusb_utmi_pad_power_on(phy);
+ }
+
+ return ret;
+}
+
static const struct xhci_driver_overrides tegra_xhci_overrides __initconst = {
.reset = tegra_xhci_setup,
+ .hub_control = tegra_xhci_hub_control,
};
static int __init tegra_xusb_init(void)
--
2.17.1
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