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Commit ad71c962 authored by Matthew Garrett's avatar Matthew Garrett Committed by Jesse Barnes
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PCI: pcie: Add support for setting default ASPM policy 



Distributions may wish to provide different defaults for PCIE ASPM
depending on their target audience. Provide a configuration option for
choosing the default policy.

Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent f67fd55f

drivers/pci/pcie/Kconfig

+25 −0
Original line number Diff line number Diff line
@@ -55,6 +55,31 @@ config PCIEASPM_DEBUG 
	  This enables PCI Express ASPM debug support. It will add per-device

	  interface to control ASPM.



choice

	prompt "Default ASPM policy"

	default PCIEASPM_DEFAULT

	depends on PCIEASPM



config PCIEASPM_DEFAULT

        bool "BIOS default"

	depends on PCIEASPM

	help

	  Use the BIOS defaults for PCI Express ASPM.



config PCIEASPM_POWERSAVE

        bool "Powersave"

	depends on PCIEASPM

	help

	  Enable PCI Express ASPM L0s and L1 where possible, even if the

	  BIOS did not.



config PCIEASPM_PERFORMANCE

        bool "Performance"

	depends on PCIEASPM

	help

	  Disable PCI Express ASPM L0s and L1, even if the BIOS enabled them.

endchoice



config PCIE_PME

	def_bool y

	depends on PCIEPORTBUS && PM_RUNTIME && EXPERIMENTAL && ACPI

drivers/pci/pcie/aspm.c

+8 −0
Original line number Diff line number Diff line
@@ -76,7 +76,15 @@ static LIST_HEAD(link_list); 
#define POLICY_DEFAULT 0	/* BIOS default setting */

#define POLICY_PERFORMANCE 1	/* high performance */

#define POLICY_POWERSAVE 2	/* high power saving */



#ifdef CONFIG_PCIEASPM_PERFORMANCE

static int aspm_policy = POLICY_PERFORMANCE;

#elif defined CONFIG_PCIEASPM_POWERSAVE

static int aspm_policy = POLICY_POWERSAVE;

#else

static int aspm_policy;

#endif



static const char *policy_str[] = {

	[POLICY_DEFAULT] = "default",

	[POLICY_PERFORMANCE] = "performance",