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Merge branch 'pci/pm'

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- Protect driver's D3cold preference from being overwritten by user space
  via sysfs (Lukas Wunner)

- Avoid PME from D3hot/D3cold for AMD Rembrandt and Phoenix USB4 to fix
  wakeup by USB4-attached devices (Mario Limonciello)

* pci/pm:
  x86/PCI: Avoid PME from D3hot/D3cold for AMD Rembrandt and Phoenix USB4
  PCI/sysfs: Protect driver's D3cold preference from user space
This commit is contained in:
Bjorn Helgaas 2023-10-28 13:30:59 -05:00
commit 2afbbc65be
3 changed files with 61 additions and 5 deletions
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59
arch/x86/pci/fixup.c
View File

@ -3,9 +3,11 @@
* Exceptions for specific devices. Usually work-arounds for fatal design flaws.
*/
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/pci.h>
#include <linux/suspend.h>
#include <linux/vgaarb.h>
#include <asm/amd_nb.h>
#include <asm/hpet.h>
@ -904,3 +906,60 @@ static void chromeos_fixup_apl_pci_l1ss_capability(struct pci_dev *dev)
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x5ad6, chromeos_save_apl_pci_l1ss_capability);
DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_INTEL, 0x5ad6, chromeos_fixup_apl_pci_l1ss_capability);
#ifdef CONFIG_SUSPEND
/*
* Root Ports on some AMD SoCs advertise PME_Support for D3hot and D3cold, but
* if the SoC is put into a hardware sleep state by the amd-pmc driver, the
* Root Ports don't generate wakeup interrupts for USB devices.
*
* When suspending, remove D3hot and D3cold from the PME_Support advertised
* by the Root Port so we don't use those states if we're expecting wakeup
* interrupts. Restore the advertised PME_Support when resuming.
*/
static void amd_rp_pme_suspend(struct pci_dev *dev)
{
struct pci_dev *rp;
/*
* PM_SUSPEND_ON means we're doing runtime suspend, which means
* amd-pmc will not be involved so PMEs during D3 work as advertised.
*
* The PMEs *do* work if amd-pmc doesn't put the SoC in the hardware
* sleep state, but we assume amd-pmc is always present.
*/
if (pm_suspend_target_state == PM_SUSPEND_ON)
return;
rp = pcie_find_root_port(dev);
if (!rp->pm_cap)
return;
rp->pme_support &= ~((PCI_PM_CAP_PME_D3hot|PCI_PM_CAP_PME_D3cold) >>
PCI_PM_CAP_PME_SHIFT);
dev_info_once(&rp->dev, "quirk: disabling D3cold for suspend\n");
}
static void amd_rp_pme_resume(struct pci_dev *dev)
{
struct pci_dev *rp;
u16 pmc;
rp = pcie_find_root_port(dev);
if (!rp->pm_cap)
return;
pci_read_config_word(rp, rp->pm_cap + PCI_PM_PMC, &pmc);
rp->pme_support = FIELD_GET(PCI_PM_CAP_PME_MASK, pmc);
}
/* Rembrandt (yellow_carp) */
DECLARE_PCI_FIXUP_SUSPEND(PCI_VENDOR_ID_AMD, 0x162e, amd_rp_pme_suspend);
DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x162e, amd_rp_pme_resume);
DECLARE_PCI_FIXUP_SUSPEND(PCI_VENDOR_ID_AMD, 0x162f, amd_rp_pme_suspend);
DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x162f, amd_rp_pme_resume);
/* Phoenix (pink_sardine) */
DECLARE_PCI_FIXUP_SUSPEND(PCI_VENDOR_ID_AMD, 0x1668, amd_rp_pme_suspend);
DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x1668, amd_rp_pme_resume);
DECLARE_PCI_FIXUP_SUSPEND(PCI_VENDOR_ID_AMD, 0x1669, amd_rp_pme_suspend);
DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_AMD, 0x1669, amd_rp_pme_resume);
#endif /* CONFIG_SUSPEND */

2
drivers/pci/pci-acpi.c
View File

@ -911,7 +911,7 @@ pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
{
int acpi_state, d_max;
if (pdev->no_d3cold)
if (pdev->no_d3cold || !pdev->d3cold_allowed)
d_max = ACPI_STATE_D3_HOT;
else
d_max = ACPI_STATE_D3_COLD;

5
drivers/pci/pci-sysfs.c
View File

@ -530,10 +530,7 @@ static ssize_t d3cold_allowed_store(struct device *dev,
return -EINVAL;
pdev->d3cold_allowed = !!val;
if (pdev->d3cold_allowed)
pci_d3cold_enable(pdev);
else
pci_d3cold_disable(pdev);
pci_bridge_d3_update(pdev);
pm_runtime_resume(dev);