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authorRajesh Shah <rajesh.shah@intel.com>2005-11-23 15:44:54 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-23 23:04:27 -0800
commit5a49f2036ad14092c11d09f186da86fd5ae49a05 (patch)
tree75817c2524974df325db97786469e806c4ee546a /drivers/pci
parentdcb890749bbe63af96163c499e9c86b441fb6c83 (diff)
downloadop-kernel-dev-5a49f2036ad14092c11d09f186da86fd5ae49a05.zip
op-kernel-dev-5a49f2036ad14092c11d09f186da86fd5ae49a05.tar.gz
[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>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/hotplug/pciehp.h1
-rw-r--r--drivers/pci/hotplug/pciehp_ctrl.c15
-rw-r--r--drivers/pci/hotplug/pciehp_hpc.c10
3 files changed, 11 insertions, 15 deletions
diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index c42b68d..6a61b9f 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -59,7 +59,6 @@ struct slot {
struct slot *next;
u8 bus;
u8 device;
- u16 status;
u32 number;
u8 state;
struct timer_list task_event;
diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
index 5e582ec..83c4b86 100644
--- a/drivers/pci/hotplug/pciehp_ctrl.c
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -207,7 +207,6 @@ u8 pciehp_handle_power_fault(u8 hp_slot, void *inst_id)
* power fault Cleared
*/
info("Power fault cleared on Slot(%d)\n", ctrl->first_slot + hp_slot);
- p_slot->status = 0x00;
taskInfo->event_type = INT_POWER_FAULT_CLEAR;
} else {
/*
@@ -215,8 +214,6 @@ u8 pciehp_handle_power_fault(u8 hp_slot, void *inst_id)
*/
info("Power fault on Slot(%d)\n", ctrl->first_slot + hp_slot);
taskInfo->event_type = INT_POWER_FAULT;
- /* set power fault status for this board */
- p_slot->status = 0xFF;
info("power fault bit %x set\n", hp_slot);
}
if (rc)
@@ -317,13 +314,10 @@ static int board_added(struct slot *p_slot)
return rc;
}
- dbg("%s: slot status = %x\n", __FUNCTION__, p_slot->status);
-
/* Check for a power fault */
- if (p_slot->status == 0xFF) {
- /* power fault occurred, but it was benign */
+ if (p_slot->hpc_ops->query_power_fault(p_slot)) {
+ dbg("%s: power fault detected\n", __FUNCTION__);
rc = POWER_FAILURE;
- p_slot->status = 0;
goto err_exit;
}
@@ -334,8 +328,6 @@ static int board_added(struct slot *p_slot)
goto err_exit;
}
- p_slot->status = 0;
-
/*
* Some PCI Express root ports require fixup after hot-plug operation.
*/
@@ -382,9 +374,6 @@ static int remove_board(struct slot *p_slot)
dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot);
- /* Change status to shutdown */
- p_slot->status = 0x01;
-
/* Wait for exclusive access to hardware */
down(&ctrl->crit_sect);
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 2387e75..0b8b26b 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -750,7 +750,7 @@ static int hpc_power_on_slot(struct slot * slot)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
u16 slot_cmd;
- u16 slot_ctrl;
+ u16 slot_ctrl, slot_status;
int retval = 0;
@@ -767,6 +767,14 @@ static int hpc_power_on_slot(struct slot * slot)
return -1;
}
+ /* Clear sticky power-fault bit from previous power failures */
+ hp_register_read_word(php_ctlr->pci_dev,
+ SLOT_STATUS(slot->ctrl->cap_base), slot_status);
+ slot_status &= PWR_FAULT_DETECTED;
+ if (slot_status)
+ hp_register_write_word(php_ctlr->pci_dev,
+ SLOT_STATUS(slot->ctrl->cap_base), slot_status);
+
retval = hp_register_read_word(php_ctlr->pci_dev, SLOT_CTRL(slot->ctrl->cap_base), slot_ctrl);
if (retval) {
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