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pci: framework: disable auto suspend link

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Some endpoint devices do not go into D3hot during suspend.  By pass
auto suspend if device do not allow D3hot.

CRs-Fixed: 2418347
Change-Id: Ida6e4a2b60b7d08932bfff79144afd67787ca0f2
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>
This commit is contained in:
Sujeev Dias
2019-02-27 14:59:23 -08:00
committed by Gerrit - the friendly Code Review server
parent d126692554
commit 02f0bed29f
2 changed files with 16 additions and 1 deletions
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14
drivers/pci/pci-driver.c
View File

@@ -827,6 +827,10 @@ static int pci_pm_suspend_noirq(struct device *dev)
}
}
/* if d3hot is not supported bail out */
if (pci_dev->no_d3hot)
return 0;
if (!pci_dev->state_saved) {
pci_save_state(pci_dev);
if (pci_power_manageable(pci_dev))
@@ -883,6 +887,7 @@ static int pci_pm_resume_noirq(struct device *dev)
if (dev_pm_smart_suspend_and_suspended(dev))
pm_runtime_set_active(dev);
if (!pci_dev->no_d3hot)
pci_pm_default_resume_early(pci_dev);
if (pci_has_legacy_pm_support(pci_dev))
@@ -1281,6 +1286,10 @@ static int pci_pm_runtime_suspend(struct device *dev)
return 0;
}
/* if d3hot is not supported bail out */
if (pci_dev->no_d3hot)
return 0;
if (!pci_dev->state_saved) {
pci_save_state(pci_dev);
pci_finish_runtime_suspend(pci_dev);
@@ -1295,6 +1304,10 @@ static int pci_pm_runtime_resume(struct device *dev)
struct pci_dev *pci_dev = to_pci_dev(dev);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
/* we skipped d3hot processing so skip re-init */
if (pci_dev->no_d3hot)
goto skip_restore;
/*
* Restoring config space is necessary even if the device is not bound
* to a driver because although we left it in D0, it may have gone to
@@ -1309,6 +1322,7 @@ static int pci_pm_runtime_resume(struct device *dev)
pci_enable_wake(pci_dev, PCI_D0, false);
pci_fixup_device(pci_fixup_resume, pci_dev);
skip_restore:
if (pm && pm->runtime_resume)
rc = pm->runtime_resume(dev);

1
include/linux/pci.h
View File

@@ -333,6 +333,7 @@ struct pci_dev {
unsigned int d2_support:1; /* Low power state D2 is supported */
unsigned int no_d1d2:1; /* D1 and D2 are forbidden */
unsigned int no_d3cold:1; /* D3cold is forbidden */
unsigned int no_d3hot:1; /* D3hot is forbidden */
unsigned int bridge_d3:1; /* Allow D3 for bridge */
unsigned int d3cold_allowed:1; /* D3cold is allowed by user */
unsigned int mmio_always_on:1; /* Disallow turning off io/mem