From: Rajat Jain Date: Wed, 5 Feb 2014 02:30:40 +0000 (-0800) Subject: PCI: pciehp: Disable link notification across slot reset X-Git-Tag: firefly_0821_release~176^2~4197^2~4^2~5 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=06a8d89af551b6151fa2289dd8660647ea9d2faa;p=firefly-linux-kernel-4.4.55.git PCI: pciehp: Disable link notification across slot reset Disable the link notification (in addition to presence detect notifications) across the slot reset since the reset could flap the link, and we don't want to treat it as hot unplug followed by a hotplug. Signed-off-by: Rajat Jain Signed-off-by: Rajat Jain Signed-off-by: Guenter Roeck Signed-off-by: Bjorn Helgaas --- diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index 15ca3a1cad8d..6433e73aa2df 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -619,33 +619,37 @@ static void pcie_disable_notification(struct controller *ctrl) /* * pciehp has a 1:1 bus:slot relationship so we ultimately want a secondary - * bus reset of the bridge, but if the slot supports surprise removal we need - * to disable presence detection around the bus reset and clear any spurious + * bus reset of the bridge, but if the slot supports surprise removal (or + * link state change based hotplug), we need to disable presence detection + * (or link state notifications) around the bus reset and clear any spurious * events after. */ int pciehp_reset_slot(struct slot *slot, int probe) { struct controller *ctrl = slot->ctrl; struct pci_dev *pdev = ctrl_dev(ctrl); + u16 stat_mask = 0, ctrl_mask = 0; if (probe) return 0; - if (HP_SUPR_RM(ctrl)) { - pcie_write_cmd(ctrl, 0, PCI_EXP_SLTCTL_PDCE); - if (pciehp_poll_mode) - del_timer_sync(&ctrl->poll_timer); + if (HP_SUPR_RM(ctrl) && !ATTN_BUTTN(ctrl)) { + ctrl_mask |= PCI_EXP_SLTCTL_PDCE; + stat_mask |= PCI_EXP_SLTSTA_PDC; } + ctrl_mask |= PCI_EXP_SLTCTL_DLLSCE; + stat_mask |= PCI_EXP_SLTSTA_DLLSC; + + pcie_write_cmd(ctrl, 0, ctrl_mask); + if (pciehp_poll_mode) + del_timer_sync(&ctrl->poll_timer); pci_reset_bridge_secondary_bus(ctrl->pcie->port); - if (HP_SUPR_RM(ctrl)) { - pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, - PCI_EXP_SLTSTA_PDC); - pcie_write_cmd(ctrl, PCI_EXP_SLTCTL_PDCE, PCI_EXP_SLTCTL_PDCE); - if (pciehp_poll_mode) - int_poll_timeout(ctrl->poll_timer.data); - } + pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, stat_mask); + pcie_write_cmd(ctrl, ctrl_mask, ctrl_mask); + if (pciehp_poll_mode) + int_poll_timeout(ctrl->poll_timer.data); return 0; }