xhci: Refactor bus suspend state into a struct.

There are several variables in the xhci_hcd structure that are related to
bus suspend and resume state.  There are a couple different port status
arrays that are accessed by port index.  Move those variables into a
separate structure, xhci_bus_state.  Stash that structure in xhci_hcd.

When we have two roothhubs that can be suspended and resumed separately,
we can have two xhci_bus_states, and index into the port arrays in each
structure with the fake roothub port index (not the real hardware port
index).

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

5 files changed, 59 insertions, 34 deletions

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 89ff025b41be..4944ba135f9a 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -291,6 +291,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
         u32 __iomem *port_array[15 + USB_MAXCHILDREN];
         int i;
         int slot_id;
+        struct xhci_bus_state *bus_state;
 
         ports = HCS_MAX_PORTS(xhci->hcs_params1);
         for (i = 0; i < ports; i++) {
@@ -300,6 +301,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                         port_array[i] =
                                 xhci->usb2_ports[i - xhci->num_usb3_ports];
         }
+        bus_state = &xhci->bus_state[hcd_index(hcd)];
 
         spin_lock_irqsave(&xhci->lock, flags);
         switch (typeReq) {
@@ -336,10 +338,10 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                         if ((temp & PORT_RESET) || !(temp & PORT_PE))
                                 goto error;
                         if (!DEV_SUPERSPEED(temp) && time_after_eq(jiffies,
-                                                xhci->resume_done[wIndex])) {
+                                                bus_state->resume_done[wIndex])) {
                                 xhci_dbg(xhci, "Resume USB2 port %d\n",
                                         wIndex + 1);
-                                xhci->resume_done[wIndex] = 0;
+                                bus_state->resume_done[wIndex] = 0;
                                 temp1 = xhci_port_state_to_neutral(temp);
                                 temp1 &= ~PORT_PLS_MASK;
                                 temp1 |= PORT_LINK_STROBE | XDEV_U0;
@@ -354,15 +356,15 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                                         goto error;
                                 }
                                 xhci_ring_device(xhci, slot_id);
-                                xhci->port_c_suspend |= 1 << wIndex;
-                                xhci->suspended_ports &= ~(1 << wIndex);
+                                bus_state->port_c_suspend |= 1 << wIndex;
+                                bus_state->suspended_ports &= ~(1 << wIndex);
                         }
                 }
                 if ((temp & PORT_PLS_MASK) == XDEV_U0
                         && (temp & PORT_POWER)
-                        && (xhci->suspended_ports & (1 << wIndex))) {
-                        xhci->suspended_ports &= ~(1 << wIndex);
-                        xhci->port_c_suspend |= 1 << wIndex;
+                        && (bus_state->suspended_ports & (1 << wIndex))) {
+                        bus_state->suspended_ports &= ~(1 << wIndex);
+                        bus_state->port_c_suspend |= 1 << wIndex;
                 }
                 if (temp & PORT_CONNECT) {
                         status |= USB_PORT_STAT_CONNECTION;
@@ -376,7 +378,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                         status |= USB_PORT_STAT_RESET;
                 if (temp & PORT_POWER)
                         status |= USB_PORT_STAT_POWER;
-                if (xhci->port_c_suspend & (1 << wIndex))
+                if (bus_state->port_c_suspend & (1 << wIndex))
                         status |= 1 << USB_PORT_FEAT_C_SUSPEND;
                 xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
@@ -422,7 +424,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                         spin_lock_irqsave(&xhci->lock, flags);
 
                         temp = xhci_readl(xhci, port_array[wIndex]);
-                        xhci->suspended_ports |= 1 << wIndex;
+                        bus_state->suspended_ports |= 1 << wIndex;
                         break;
                 case USB_PORT_FEAT_POWER:
                         /*
@@ -493,7 +495,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                                         xhci_writel(xhci, temp,
                                                         port_array[wIndex]);
                                 }
-                                xhci->port_c_suspend |= 1 << wIndex;
+                                bus_state->port_c_suspend |= 1 << wIndex;
                         }
 
                         slot_id = xhci_find_slot_id_by_port(xhci, wIndex + 1);
@@ -504,7 +506,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                         xhci_ring_device(xhci, slot_id);
                         break;
                 case USB_PORT_FEAT_C_SUSPEND:
-                        xhci->port_c_suspend &= ~(1 << wIndex);
+                        bus_state->port_c_suspend &= ~(1 << wIndex);
                 case USB_PORT_FEAT_C_RESET:
                 case USB_PORT_FEAT_C_CONNECTION:
                 case USB_PORT_FEAT_C_OVER_CURRENT:
@@ -546,6 +548,7 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
         int ports;
         u32 __iomem *port_array[15 + USB_MAXCHILDREN];
+        struct xhci_bus_state *bus_state;
 
         ports = HCS_MAX_PORTS(xhci->hcs_params1);
         for (i = 0; i < ports; i++) {
@@ -555,6 +558,7 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
                         port_array[i] =
                                 xhci->usb2_ports[i - xhci->num_usb3_ports];
         }
+        bus_state = &xhci->bus_state[hcd_index(hcd)];
 
         /* Initial status is no changes */
         retval = (ports + 8) / 8;
@@ -568,9 +572,9 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
         for (i = 0; i < ports; i++) {
                 temp = xhci_readl(xhci, port_array[i]);
                 if ((temp & mask) != 0 ||
-                        (xhci->port_c_suspend & 1 << i) ||
-                        (xhci->resume_done[i] && time_after_eq(
-                            jiffies, xhci->resume_done[i]))) {
+                        (bus_state->port_c_suspend & 1 << i) ||
+                        (bus_state->resume_done[i] && time_after_eq(
+                            jiffies, bus_state->resume_done[i]))) {
                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
                         status = 1;
                 }
@@ -587,6 +591,7 @@ int xhci_bus_suspend(struct usb_hcd *hcd)
         int max_ports, port_index;
         u32 __iomem *port_array[15 + USB_MAXCHILDREN];
         int i;
+        struct xhci_bus_state *bus_state;
         unsigned long flags;
 
         xhci_dbg(xhci, "suspend root hub\n");
@@ -598,13 +603,14 @@ int xhci_bus_suspend(struct usb_hcd *hcd)
                         port_array[i] =
                                 xhci->usb2_ports[i - xhci->num_usb3_ports];
         }
+        bus_state = &xhci->bus_state[hcd_index(hcd)];
 
         spin_lock_irqsave(&xhci->lock, flags);
 
         if (hcd->self.root_hub->do_remote_wakeup) {
                 port_index = max_ports;
                 while (port_index--) {
-                        if (xhci->resume_done[port_index] != 0) {
+                        if (bus_state->resume_done[port_index] != 0) {
                                 spin_unlock_irqrestore(&xhci->lock, flags);
                                 xhci_dbg(xhci, "suspend failed because "
                                                 "port %d is resuming\n",
@@ -615,7 +621,7 @@ int xhci_bus_suspend(struct usb_hcd *hcd)
         }
 
         port_index = max_ports;
-        xhci->bus_suspended = 0;
+        bus_state->bus_suspended = 0;
         while (port_index--) {
                 /* suspend the port if the port is not suspended */
                 u32 t1, t2;
@@ -635,7 +641,7 @@ int xhci_bus_suspend(struct usb_hcd *hcd)
                         }
                         t2 &= ~PORT_PLS_MASK;
                         t2 |= PORT_LINK_STROBE | XDEV_U3;
-                        set_bit(port_index, &xhci->bus_suspended);
+                        set_bit(port_index, &bus_state->bus_suspended);
                 }
                 if (hcd->self.root_hub->do_remote_wakeup) {
                         if (t1 & PORT_CONNECT) {
@@ -667,7 +673,7 @@ int xhci_bus_suspend(struct usb_hcd *hcd)
                 }
         }
         hcd->state = HC_STATE_SUSPENDED;
-        xhci->next_statechange = jiffies + msecs_to_jiffies(10);
+        bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
         spin_unlock_irqrestore(&xhci->lock, flags);
         return 0;
 }
@@ -678,6 +684,7 @@ int xhci_bus_resume(struct usb_hcd *hcd)
         int max_ports, port_index;
         u32 __iomem *port_array[15 + USB_MAXCHILDREN];
         int i;
+        struct xhci_bus_state *bus_state;
         u32 temp;
         unsigned long flags;
 
@@ -690,8 +697,9 @@ int xhci_bus_resume(struct usb_hcd *hcd)
                         port_array[i] =
                                 xhci->usb2_ports[i - xhci->num_usb3_ports];
         }
+        bus_state = &xhci->bus_state[hcd_index(hcd)];
 
-        if (time_before(jiffies, xhci->next_statechange))
+        if (time_before(jiffies, bus_state->next_statechange))
                 msleep(5);
 
         spin_lock_irqsave(&xhci->lock, flags);
@@ -717,7 +725,7 @@ int xhci_bus_resume(struct usb_hcd *hcd)
                         temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
                 else
                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
-                if (test_bit(port_index, &xhci->bus_suspended) &&
+                if (test_bit(port_index, &bus_state->bus_suspended) &&
                     (temp & PORT_PLS_MASK)) {
                         if (DEV_SUPERSPEED(temp)) {
                                 temp = xhci_port_state_to_neutral(temp);
@@ -763,7 +771,7 @@ int xhci_bus_resume(struct usb_hcd *hcd)
 
         (void) xhci_readl(xhci, &xhci->op_regs->command);
 
-        xhci->next_statechange = jiffies + msecs_to_jiffies(5);
+        bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
         /* re-enable irqs */
         temp = xhci_readl(xhci, &xhci->op_regs->command);
         temp |= CMD_EIE;
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 9688a58611d4..bc809cbd570a 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1451,7 +1451,7 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
 
         xhci->page_size = 0;
         xhci->page_shift = 0;
-        xhci->bus_suspended = 0;
+        xhci->bus_state[0].bus_suspended = 0;
 }
 
 static int xhci_test_trb_in_td(struct xhci_hcd *xhci,
@@ -1971,7 +1971,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
         for (i = 0; i < MAX_HC_SLOTS; ++i)
                 xhci->devs[i] = NULL;
         for (i = 0; i < USB_MAXCHILDREN; ++i)
-                xhci->resume_done[i] = 0;
+                xhci->bus_state[0].resume_done[i] = 0;
 
         if (scratchpad_alloc(xhci, flags))
                 goto fail;
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 582537689ebc..7cea2483e593 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1166,7 +1166,9 @@ static void handle_port_status(struct xhci_hcd *xhci,
         unsigned int faked_port_index;
         u32 __iomem *port_array[15 + USB_MAXCHILDREN];
         int i;
+        struct xhci_bus_state *bus_state;
 
+        bus_state = &xhci->bus_state[0];
         /* Port status change events always have a successful completion code */
         if (GET_COMP_CODE(event->generic.field[2]) != COMP_SUCCESS) {
                 xhci_warn(xhci, "WARN: xHC returned failed port status event\n");
@@ -1225,10 +1227,10 @@ static void handle_port_status(struct xhci_hcd *xhci,
                         xhci_writel(xhci, temp, port_array[faked_port_index]);
                 } else {
                         xhci_dbg(xhci, "resume HS port %d\n", port_id);
-                        xhci->resume_done[port_id - 1] = jiffies +
+                        bus_state->resume_done[port_id - 1] = jiffies +
                                 msecs_to_jiffies(20);
                         mod_timer(&hcd->rh_timer,
-                                  xhci->resume_done[port_id - 1]);
+                                  bus_state->resume_done[port_id - 1]);
                         /* Do the rest in GetPortStatus */
                 }
         }
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index a95108cba7d4..8d45bbde3da4 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -694,7 +694,10 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
         struct usb_hcd          *hcd = xhci_to_hcd(xhci);
         int                     retval;
 
-        if (time_before(jiffies, xhci->next_statechange))
+        /* Wait a bit if the bus needs to settle from the transistion to
+         * suspend.
+         */
+        if (time_before(jiffies, xhci->bus_state[0].next_statechange))
                 msleep(100);
 
         spin_lock_irq(&xhci->lock);
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index daa88581ad66..c15470eb121a 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1161,6 +1161,22 @@ struct s3_save {
         u64     erst_dequeue;
 };
 
+struct xhci_bus_state {
+        unsigned long           bus_suspended;
+        unsigned long           next_statechange;
+
+        /* Port suspend arrays are indexed by the portnum of the fake roothub */
+        /* ports suspend status arrays - max 31 ports for USB2, 15 for USB3 */
+        u32                     port_c_suspend;
+        u32                     suspended_ports;
+        unsigned long           resume_done[USB_MAXCHILDREN];
+};
+
+static inline unsigned int hcd_index(struct usb_hcd *hcd)
+{
+        return 0;
+}
+
 /* There is one ehci_hci structure per controller */
 struct xhci_hcd {
         struct usb_hcd *main_hcd;
@@ -1225,9 +1241,6 @@ struct xhci_hcd {
         /* Host controller watchdog timer structures */
         unsigned int            xhc_state;
 
-        unsigned long           bus_suspended;
-        unsigned long           next_statechange;
-
         u32                     command;
         struct s3_save          s3;
 /* Host controller is dying - not responding to commands. "I'm not dead yet!"
@@ -1249,11 +1262,10 @@ struct xhci_hcd {
 #define XHCI_LINK_TRB_QUIRK     (1 << 0)
 #define XHCI_RESET_EP_QUIRK     (1 << 1)
 #define XHCI_NEC_HOST           (1 << 2)
-        /* port suspend change*/
-        u32                     port_c_suspend;
-        /* which ports are suspended */
-        u32                     suspended_ports;
-        unsigned long           resume_done[USB_MAXCHILDREN];
+        /* There's only one roothub to keep track of bus suspend info for
+         * (right now).
+         */
+        struct xhci_bus_state   bus_state[1];
         /* Is each xHCI roothub port a USB 3.0, USB 2.0, or USB 1.1 port? */
         u8                      *port_array;
         /* Array of pointers to USB 3.0 PORTSC registers */