lkml.org 
[lkml]   [2020]   [May]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 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 ++
include/linux/pci.h | 2 ++
2 files changed, 4 insertions(+)

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/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
\
 
 \ /
  Last update: 2020-05-24 23:33    [W:0.074 / U:0.756 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site