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[PATCH] PCI Express Hotplug: clear sticky power-fault bit
Per the PCI Express spec, the power-fault-detected bit in the slot status register can be set anytime hardware detects a power fault, regardless of whether the slot has a device populated in it or not. This bit is sticky and must be explicitly cleared. This patch is needed to allow hot-add after such a power fault has been detected. Signed-off-by: Rajesh Shah <rajesh.shah@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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3 changed files with 11 additions and 15 deletions
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@ -59,7 +59,6 @@ struct slot {
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struct slot *next;
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u8 bus;
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u8 device;
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u16 status;
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u32 number;
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u8 state;
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struct timer_list task_event;
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@ -207,7 +207,6 @@ u8 pciehp_handle_power_fault(u8 hp_slot, void *inst_id)
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* power fault Cleared
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*/
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info("Power fault cleared on Slot(%d)\n", ctrl->first_slot + hp_slot);
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p_slot->status = 0x00;
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taskInfo->event_type = INT_POWER_FAULT_CLEAR;
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} else {
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/*
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@ -215,8 +214,6 @@ u8 pciehp_handle_power_fault(u8 hp_slot, void *inst_id)
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*/
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info("Power fault on Slot(%d)\n", ctrl->first_slot + hp_slot);
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taskInfo->event_type = INT_POWER_FAULT;
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/* set power fault status for this board */
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p_slot->status = 0xFF;
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info("power fault bit %x set\n", hp_slot);
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}
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if (rc)
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@ -317,13 +314,10 @@ static int board_added(struct slot *p_slot)
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return rc;
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}
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dbg("%s: slot status = %x\n", __FUNCTION__, p_slot->status);
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/* Check for a power fault */
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if (p_slot->status == 0xFF) {
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/* power fault occurred, but it was benign */
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if (p_slot->hpc_ops->query_power_fault(p_slot)) {
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dbg("%s: power fault detected\n", __FUNCTION__);
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rc = POWER_FAILURE;
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p_slot->status = 0;
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goto err_exit;
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}
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@ -334,8 +328,6 @@ static int board_added(struct slot *p_slot)
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goto err_exit;
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}
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p_slot->status = 0;
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/*
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* Some PCI Express root ports require fixup after hot-plug operation.
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*/
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@ -382,9 +374,6 @@ static int remove_board(struct slot *p_slot)
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dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot);
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/* Change status to shutdown */
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p_slot->status = 0x01;
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/* Wait for exclusive access to hardware */
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down(&ctrl->crit_sect);
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@ -750,7 +750,7 @@ static int hpc_power_on_slot(struct slot * slot)
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{
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struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
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u16 slot_cmd;
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u16 slot_ctrl;
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u16 slot_ctrl, slot_status;
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int retval = 0;
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@ -767,6 +767,14 @@ static int hpc_power_on_slot(struct slot * slot)
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return -1;
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}
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/* Clear sticky power-fault bit from previous power failures */
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hp_register_read_word(php_ctlr->pci_dev,
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SLOT_STATUS(slot->ctrl->cap_base), slot_status);
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slot_status &= PWR_FAULT_DETECTED;
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if (slot_status)
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hp_register_write_word(php_ctlr->pci_dev,
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SLOT_STATUS(slot->ctrl->cap_base), slot_status);
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retval = hp_register_read_word(php_ctlr->pci_dev, SLOT_CTRL(slot->ctrl->cap_base), slot_ctrl);
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if (retval) {
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