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Subject[PATCH v4 4/5] ACPI/PCI: Ignore _OSC DPC negotiation result if pcie_ports_dpc_native is set.
Date
From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

pcie_ports_dpc_native is set only if user requests native handling
of PCIe DPC capability via pcie_port_setup command line option.
User input takes precedence over _OSC based control negotiation
result. So consider the _OSC negotiated result for DPC ownership
only if pcie_ports_dpc_native is unset.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
drivers/acpi/pci_root.c | 2 ++
drivers/pci/pcie/portdrv.h | 2 --
include/linux/pci.h | 2 ++
3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index e0039ad3480a..f90dba464ec2 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -925,6 +925,8 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
host_bridge->native_pme = 0;
if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL))
host_bridge->native_ltr = 0;
+ }
+ if (!pcie_ports_native && !pcie_ports_dpc_native) {
if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL))
host_bridge->native_dpc = 0;
}
diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h
index 64b5e081cdb2..e4999f24ad92 100644
--- a/drivers/pci/pcie/portdrv.h
+++ b/drivers/pci/pcie/portdrv.h
@@ -25,8 +25,6 @@

#define PCIE_PORT_DEVICE_MAXSERVICES 5

-extern bool pcie_ports_dpc_native;
-
#ifdef CONFIG_PCIEAER
int pcie_aer_init(void);
#else
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 83ce1cdf5676..07d4db97f5f4 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1547,9 +1547,11 @@ static inline int pci_irqd_intx_xlate(struct irq_domain *d,
#ifdef CONFIG_PCIEPORTBUS
extern bool pcie_ports_disabled;
extern bool pcie_ports_native;
+extern bool pcie_ports_dpc_native;
#else
#define pcie_ports_disabled true
#define pcie_ports_native false
+#define pcie_ports_dpc_native false
#endif

#define PCIE_LINK_STATE_L0S BIT(0)
--
2.17.1
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