From 4f854f2a2a4414248f82239e8d86b98489a1cf40 Mon Sep 17 00:00:00 2001 From: Rajat Jain Date: Tue, 4 Feb 2014 18:29:23 -0800 Subject: [PATCH] PCI: pciehp: Enable link state change notifications Enable the Link state notifications unconditionally. Enable the presence detection notification only if attention button is absent. This was discussed at this thread: https://lkml.kernel.org/r/529E5C0E.80903@gmail.com Signed-off-by: Rajat Jain Signed-off-by: Rajat Jain Signed-off-by: Guenter Roeck Signed-off-by: Bjorn Helgaas --- drivers/pci/hotplug/pciehp_hpc.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index b413dce..245a3cb 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -600,9 +600,17 @@ void pcie_enable_notification(struct controller *ctrl) * when it is cleared in the interrupt service routine, and * next power fault detected interrupt was notified again. */ - cmd = PCI_EXP_SLTCTL_PDCE; + + /* + * Always enable link events: thus link-up and link-down shall + * always be treated as hotplug and unplug respectively. Enable + * presence detect only if Attention Button is not present. + */ + cmd = PCI_EXP_SLTCTL_DLLSCE; if (ATTN_BUTTN(ctrl)) cmd |= PCI_EXP_SLTCTL_ABPE; + else + cmd |= PCI_EXP_SLTCTL_PDCE; if (MRL_SENS(ctrl)) cmd |= PCI_EXP_SLTCTL_MRLSCE; if (!pciehp_poll_mode) @@ -610,7 +618,8 @@ void pcie_enable_notification(struct controller *ctrl) mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE | PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE | - PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE); + PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE | + PCI_EXP_SLTCTL_DLLSCE); pcie_write_cmd(ctrl, cmd, mask); } -- 2.7.4