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path: root/drivers/pci
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Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/hotplug/pciehp_hpc.c42
1 files changed, 38 insertions, 4 deletions
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 70940fb3fff..eb631af9473 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");
@@ -331,8 +355,18 @@ static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
/*
* Wait for command completion.
*/
- if (!retval && !ctrl->no_cmd_complete)
- 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;