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PCI: Don't enable aspm before drivers have had a chance to veto it

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The aspm code will currently set the configured aspm policy before drivers
have had an opportunity to indicate that their hardware doesn't support it.
Unfortunately, putting some hardware in L0 or L1 can result in the hardware
no longer responding to any requests, even after aspm is disabled. It makes
more sense to leave aspm policy at the BIOS defaults at initial setup time,
reconfiguring it after pci_enable_device() is called. This allows the
driver to blacklist individual devices beforehand.

Reviewed-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Matthew Garrett 2010-06-09 16:05:07 -04:00 committed by Jesse Barnes
parent 4302e0fb7f
commit 41cd766b06
1 changed files with 14 additions and 2 deletions
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16
drivers/pci/pcie/aspm.c
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@ -588,11 +588,23 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)
* update through pcie_aspm_cap_init().
*/
pcie_aspm_cap_init(link, blacklist);
pcie_config_aspm_path(link);
/* Setup initial Clock PM state */
pcie_clkpm_cap_init(link, blacklist);
pcie_set_clkpm(link, policy_to_clkpm_state(link));
/*
* At this stage drivers haven't had an opportunity to change the
* link policy setting. Enabling ASPM on broken hardware can cripple
* it even before the driver has had a chance to disable ASPM, so
* default to a safe level right now. If we're enabling ASPM beyond
* the BIOS's expectation, we'll do so once pci_enable_device() is
* called.
*/
if (aspm_policy != POLICY_POWERSAVE) {
pcie_config_aspm_path(link);
pcie_set_clkpm(link, policy_to_clkpm_state(link));
}
unlock:
mutex_unlock(&aspm_lock);
out: