xhci: Rework port suspend structures for limited ports.

The USB core only allows up to 31 (USB_MAXCHILDREN) ports under a roothub.
The xHCI driver keeps track of which ports are suspended, which ports have
a suspend change bit set, and what time the port will be done resuming.
It keeps track of the first two by setting a bit in a u32 variable,
suspended_ports or port_c_suspend.  The xHCI driver currently assumes we
can have up to 256 ports under a roothub, so it allocates an array of 8
u32 variables for both suspended_ports and port_c_suspend.  It also
allocates a 256-element array to keep track of when the ports will be done
resuming.

Since we can only have 31 roothub ports, we only need to use one u32 for
each of the suspend state and change variables.  We simplify the bit math
that's trying to index into those arrays and set the correct bit, if we
assume wIndex never exceeds 30.  (wIndex is zero-based after it's
decremented from the value passed in from the USB core.)  Finally, we
change the resume_done array to only hold 31 elements.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: Andiry Xu <andiry.xu@amd.com>

1 files changed, 10 insertions, 18 deletions

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index d83c27b9725b..50e250ceee96 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -347,20 +347,15 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                                         goto error;
                                 }
                                 xhci_ring_device(xhci, slot_id);
-                                xhci->port_c_suspend[wIndex >> 5] |=
-                                                1 << (wIndex & 31);
-                                xhci->suspended_ports[wIndex >> 5] &=
-                                                ~(1 << (wIndex & 31));
+                                xhci->port_c_suspend |= 1 << wIndex;
+                                xhci->suspended_ports &= ~(1 << wIndex);
                         }
                 }
                 if ((temp & PORT_PLS_MASK) == XDEV_U0
                         && (temp & PORT_POWER)
-                        && (xhci->suspended_ports[wIndex >> 5] &
-                            (1 << (wIndex & 31)))) {
-                        xhci->suspended_ports[wIndex >> 5] &=
-                                        ~(1 << (wIndex & 31));
-                        xhci->port_c_suspend[wIndex >> 5] |=
-                                        1 << (wIndex & 31);
+                        && (xhci->suspended_ports & (1 << wIndex))) {
+                        xhci->suspended_ports &= ~(1 << wIndex);
+                        xhci->port_c_suspend |= 1 << wIndex;
                 }
                 if (temp & PORT_CONNECT) {
                         status |= USB_PORT_STAT_CONNECTION;
@@ -374,7 +369,7 @@ 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[wIndex >> 5] & (1 << (wIndex & 31)))
+                if (xhci->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);
@@ -421,8 +416,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                         spin_lock_irqsave(&xhci->lock, flags);
 
                         temp = xhci_readl(xhci, addr);
-                        xhci->suspended_ports[wIndex >> 5] |=
-                                        1 << (wIndex & (31));
+                        xhci->suspended_ports |= 1 << wIndex;
                         break;
                 case USB_PORT_FEAT_POWER:
                         /*
@@ -489,8 +483,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                                         temp |= PORT_LINK_STROBE | XDEV_U0;
                                         xhci_writel(xhci, temp, addr);
                                 }
-                                xhci->port_c_suspend[wIndex >> 5] |=
-                                                1 << (wIndex & 31);
+                                xhci->port_c_suspend |= 1 << wIndex;
                         }
 
                         slot_id = xhci_find_slot_id_by_port(xhci, wIndex + 1);
@@ -501,8 +494,7 @@ 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[wIndex >> 5] &=
-                                        ~(1 << (wIndex & 31));
+                        xhci->port_c_suspend &= ~(1 << wIndex);
                 case USB_PORT_FEAT_C_RESET:
                 case USB_PORT_FEAT_C_CONNECTION:
                 case USB_PORT_FEAT_C_OVER_CURRENT:
@@ -560,7 +552,7 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
                         NUM_PORT_REGS*i;
                 temp = xhci_readl(xhci, addr);
                 if ((temp & mask) != 0 ||
-                        (xhci->port_c_suspend[i >> 5] & 1 << (i & 31)) ||
+                        (xhci->port_c_suspend & 1 << i) ||
                         (xhci->resume_done[i] && time_after_eq(
                             jiffies, xhci->resume_done[i]))) {
                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;