1 files changed, 98 insertions, 31 deletions

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 891f81a0400c..79f104963166 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -247,14 +247,38 @@ static inline void pciehp_free_irq(struct controller *ctrl)
                 free_irq(ctrl->pci_dev->irq, ctrl);
 }
 
-static inline int pcie_wait_cmd(struct controller *ctrl)
+static inline int pcie_poll_cmd(struct controller *ctrl)
+{
+        u16 slot_status;
+        int timeout = 1000;
+
+        if (!pciehp_readw(ctrl, SLOTSTATUS, &slot_status))
+                if (slot_status & CMD_COMPLETED)
+                        goto completed;
+        for (timeout = 1000; timeout > 0; timeout -= 100) {
+                msleep(100);
+                if (!pciehp_readw(ctrl, SLOTSTATUS, &slot_status))
+                        if (slot_status & CMD_COMPLETED)
+                                goto completed;
+        }
+        return 0;       /* timeout */
+
+completed:
+        pciehp_writew(ctrl, SLOTSTATUS, CMD_COMPLETED);
+        return timeout;
+}
+
+static inline int pcie_wait_cmd(struct controller *ctrl, int poll)
 {
         int retval = 0;
         unsigned int msecs = pciehp_poll_mode ? 2500 : 1000;
         unsigned long timeout = msecs_to_jiffies(msecs);
         int rc;
 
-        rc = wait_event_interruptible_timeout(ctrl->queue,
+        if (poll)
+                rc = pcie_poll_cmd(ctrl);
+        else
+                rc = wait_event_interruptible_timeout(ctrl->queue,
                                               !ctrl->cmd_busy, timeout);
         if (!rc)
                 dbg("Command not completed in 1000 msec\n");
@@ -286,12 +310,28 @@ static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
                 goto out;
         }
 
-        if ((slot_status & CMD_COMPLETED) == CMD_COMPLETED ) {
-                /* After 1 sec and CMD_COMPLETED still not set, just
-                   proceed forward to issue the next command according
-                   to spec.  Just print out the error message */
-                dbg("%s: CMD_COMPLETED not clear after 1 sec.\n",
-                    __func__);
+        if (slot_status & CMD_COMPLETED) {
+                if (!ctrl->no_cmd_complete) {
+                        /*
+                         * After 1 sec and CMD_COMPLETED still not set, just
+                         * proceed forward to issue the next command according
+                         * to spec. Just print out the error message.
+                         */
+                        dbg("%s: CMD_COMPLETED not clear after 1 sec.\n",
+                            __func__);
+                } else if (!NO_CMD_CMPL(ctrl)) {
+                        /*
+                         * This controller semms to notify of command completed
+                         * event even though it supports none of power
+                         * controller, attention led, power led and EMI.
+                         */
+                        dbg("%s: Unexpected CMD_COMPLETED. Need to wait for "
+                            "command completed event.\n", __func__);
+                        ctrl->no_cmd_complete = 0;
+                } else {
+                        dbg("%s: Unexpected CMD_COMPLETED. Maybe the "
+                            "controller is broken.\n", __func__);
+                }
         }
 
         retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
@@ -315,8 +355,18 @@ static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
         /*
          * Wait for command completion.
          */
-        if (!retval)
-                retval = pcie_wait_cmd(ctrl);
+        if (!retval && !ctrl->no_cmd_complete) {
+                int poll = 0;
+                /*
+                 * if hotplug interrupt is not enabled or command
+                 * completed interrupt is not enabled, we need to poll
+                 * command completed event.
+                 */
+                if (!(slot_ctrl & HP_INTR_ENABLE) ||
+                    !(slot_ctrl & CMD_CMPL_INTR_ENABLE))
+                        poll = 1;
+                retval = pcie_wait_cmd(ctrl, poll);
+        }
  out:
         mutex_unlock(&ctrl->ctrl_lock);
         return retval;
@@ -704,13 +754,6 @@ static int hpc_power_off_slot(struct slot * slot)
         }
         dbg("%s: SLOTCTRL %x write cmd %x\n",
             __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
-
-        /*
-         * After turning power off, we must wait for at least 1 second
-         * before taking any action that relies on power having been
-         * removed from the slot/adapter.
-         */
-        msleep(1000);
  out:
         if (changed)
                 pcie_unmask_bad_dllp(ctrl);
@@ -722,6 +765,7 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
 {
         struct controller *ctrl = (struct controller *)dev_id;
         u16 detected, intr_loc;
+        struct slot *p_slot;
 
         /*
          * In order to guarantee that all interrupt events are
@@ -756,21 +800,38 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
                 wake_up_interruptible(&ctrl->queue);
         }
 
+        if (!(intr_loc & ~CMD_COMPLETED))
+                return IRQ_HANDLED;
+
+        /*
+         * Return without handling events if this handler routine is
+         * called before controller initialization is done. This may
+         * happen if hotplug event or another interrupt that shares
+         * the IRQ with pciehp arrives before slot initialization is
+         * done after interrupt handler is registered.
+         *
+         * FIXME - Need more structural fixes. We need to be ready to
+         * handle the event before installing interrupt handler.
+         */
+        p_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
+        if (!p_slot || !p_slot->hpc_ops)
+                return IRQ_HANDLED;
+
         /* Check MRL Sensor Changed */
         if (intr_loc & MRL_SENS_CHANGED)
-                pciehp_handle_switch_change(0, ctrl);
+                pciehp_handle_switch_change(p_slot);
 
         /* Check Attention Button Pressed */
         if (intr_loc & ATTN_BUTTN_PRESSED)
-                pciehp_handle_attention_button(0, ctrl);
+                pciehp_handle_attention_button(p_slot);
 
         /* Check Presence Detect Changed */
         if (intr_loc & PRSN_DETECT_CHANGED)
-                pciehp_handle_presence_change(0, ctrl);
+                pciehp_handle_presence_change(p_slot);
 
         /* Check Power Fault Detected */
         if (intr_loc & PWR_FAULT_DETECTED)
-                pciehp_handle_power_fault(0, ctrl);
+                pciehp_handle_power_fault(p_slot);
 
         return IRQ_HANDLED;
 }
@@ -1028,6 +1089,12 @@ static int pciehp_acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev)
 static int pcie_init_hardware_part1(struct controller *ctrl,
                                     struct pcie_device *dev)
 {
+        /* Clear all remaining event bits in Slot Status register */
+        if (pciehp_writew(ctrl, SLOTSTATUS, 0x1f)) {
+                err("%s: Cannot write to SLOTSTATUS register\n", __func__);
+                return -1;
+        }
+
         /* Mask Hot-plug Interrupt Enable */
         if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE)) {
                 err("%s: Cannot mask hotplug interrupt enable\n", __func__);
@@ -1040,16 +1107,6 @@ int pcie_init_hardware_part2(struct controller *ctrl, struct pcie_device *dev)
 {
         u16 cmd, mask;
 
-        /*
-         * We need to clear all events before enabling hotplug interrupt
-         * notification mechanism in order for hotplug controler to
-         * generate interrupts.
-         */
-        if (pciehp_writew(ctrl, SLOTSTATUS, 0x1f)) {
-                err("%s: Cannot write to SLOTSTATUS register\n", __FUNCTION__);
-                return -1;
-        }
-
         cmd = PRSN_DETECT_ENABLE;
         if (ATTN_BUTTN(ctrl))
                 cmd |= ATTN_BUTTN_ENABLE;
@@ -1116,6 +1173,7 @@ static inline void dbg_ctrl(struct controller *ctrl)
         dbg("  Power Indicator      : %3s\n", PWR_LED(ctrl)    ? "yes" : "no");
         dbg("  Hot-Plug Surprise    : %3s\n", HP_SUPR_RM(ctrl) ? "yes" : "no");
         dbg("  EMI Present          : %3s\n", EMI(ctrl)        ? "yes" : "no");
+        dbg("  Comamnd Completed    : %3s\n", NO_CMD_CMPL(ctrl)? "no" : "yes");
         pciehp_readw(ctrl, SLOTSTATUS, &reg16);
         dbg("Slot Status            : 0x%04x\n", reg16);
         pciehp_readw(ctrl, SLOTSTATUS, &reg16);
@@ -1147,6 +1205,15 @@ int pcie_init(struct controller *ctrl, struct pcie_device *dev)
         mutex_init(&ctrl->ctrl_lock);
         init_waitqueue_head(&ctrl->queue);
         dbg_ctrl(ctrl);
+        /*
+         * Controller doesn't notify of command completion if the "No
+         * Command Completed Support" bit is set in Slot Capability
+         * register or the controller supports none of power
+         * controller, attention led, power led and EMI.
+         */
+        if (NO_CMD_CMPL(ctrl) ||
+            !(POWER_CTRL(ctrl) | ATTN_LED(ctrl) | PWR_LED(ctrl) | EMI(ctrl)))
+            ctrl->no_cmd_complete = 1;
 
         info("HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n",
              pdev->vendor, pdev->device,