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| author | Thomas Schaefer <thomas.schaefer@kontron.com> | 2005-12-08 11:55:57 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-01-09 12:13:18 -0800 |
| commit | c7ab337f91b59f71a30c3ab71e3bdfff41671977 (patch) | |
| tree | 187fdbee2a796814d00dfe097dc470b4087b658f /drivers/pci | |
| parent | 9d265124d051c2cf6716639239609d83f736dcdb (diff) | |
| download | kernel_samsung_smdk4412-c7ab337f91b59f71a30c3ab71e3bdfff41671977.zip kernel_samsung_smdk4412-c7ab337f91b59f71a30c3ab71e3bdfff41671977.tar.gz kernel_samsung_smdk4412-c7ab337f91b59f71a30c3ab71e3bdfff41671977.tar.bz2 | |
[PATCH] pciehp: handle sticky power-fault status
This patch disables power fault, MRL sensor and presence detection
interrupts when a PCIe slot is powered-off and enables those
interrupts when it is powered-on again. This is necessary to prevent
the associated events from causing an endless cycle of interrupts
due to the power-fault bit, which stays set till power is restored
to the slot.
Signed-off-by: Thomas Schaefer <thomas.schaefer@kontron.com>
Signed-off-by: Rajesh Shah <rajesh.shah@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/hotplug/pciehp_hpc.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index ac1e495..77e5303 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -787,8 +787,13 @@ static int hpc_power_on_slot(struct slot * slot) slot_cmd = (slot_ctrl & ~PWR_CTRL) | POWER_ON; + /* Enable detection that we turned off at slot power-off time */ if (!pciehp_poll_mode) - slot_cmd = slot_cmd | HP_INTR_ENABLE; + slot_cmd = slot_cmd | + PWR_FAULT_DETECT_ENABLE | + MRL_DETECT_ENABLE | + PRSN_DETECT_ENABLE | + HP_INTR_ENABLE; retval = pcie_write_cmd(slot, slot_cmd); @@ -833,8 +838,18 @@ static int hpc_power_off_slot(struct slot * slot) slot_cmd = (slot_ctrl & ~PWR_CTRL) | POWER_OFF; + /* + * If we get MRL or presence detect interrupts now, the isr + * will notice the sticky power-fault bit too and issue power + * indicator change commands. This will lead to an endless loop + * of command completions, since the power-fault bit remains on + * till the slot is powered on again. + */ if (!pciehp_poll_mode) - slot_cmd = slot_cmd | HP_INTR_ENABLE; + slot_cmd = (slot_cmd & + ~PWR_FAULT_DETECT_ENABLE & + ~MRL_DETECT_ENABLE & + ~PRSN_DETECT_ENABLE) | HP_INTR_ENABLE; retval = pcie_write_cmd(slot, slot_cmd); |