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pci-v6.7-fixes-2

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Merge tag 'pci-v6.7-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci

Pull PCI fixes from Bjorn Helgaas:

 - Revert an ASPM patch that caused an unintended reboot when resuming
   after suspend (Bjorn Helgaas)

 - Orphan Cadence PCIe IP (Bjorn Helgaas)

* tag 'pci-v6.7-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci:
  MAINTAINERS: Orphan Cadence PCIe IP
  Revert "PCI/ASPM: Remove pcie_aspm_pm_state_change()"
This commit is contained in:
Linus Torvalds 2024-01-03 14:18:57 -08:00
commit ac865f00af
5 changed files with 33 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
CREDITS
View file

@ -1855,6 +1855,10 @@ D: Fedora kernel maintenance (2003-2014).
D: 'Trinity' and similar fuzz testing work.
D: Misc/Other.
N: Tom Joseph
E: tjoseph@cadence.com
D: Cadence PCIe driver
N: Martin Josfsson
E: gandalf@wlug.westbo.se
P: 1024D/F6B6D3B1 7610 7CED 5C34 4AA6 DBA2 8BE1 5A6D AF95 F6B6 D3B1

5
MAINTAINERS
View file

@ -16458,11 +16458,10 @@ F: Documentation/devicetree/bindings/pci/pci-armada8k.txt
F: drivers/pci/controller/dwc/pcie-armada8k.c
PCI DRIVER FOR CADENCE PCIE IP
M: Tom Joseph <tjoseph@cadence.com>
L: linux-pci@vger.kernel.org
S: Maintained
S: Orphan
F: Documentation/devicetree/bindings/pci/cdns,*
F: drivers/pci/controller/cadence/
F: drivers/pci/controller/cadence/*cadence*
PCI DRIVER FOR FREESCALE LAYERSCAPE
M: Minghuan Lian <minghuan.Lian@nxp.com>

6
drivers/pci/pci.c
View file

@ -1335,6 +1335,9 @@ static int pci_set_full_power_state(struct pci_dev *dev)
pci_restore_bars(dev);
}
if (dev->bus->self)
pcie_aspm_pm_state_change(dev->bus->self);
return 0;
}
@ -1429,6 +1432,9 @@ static int pci_set_low_power_state(struct pci_dev *dev, pci_power_t state)
pci_power_name(dev->current_state),
pci_power_name(state));
if (dev->bus->self)
pcie_aspm_pm_state_change(dev->bus->self);
return 0;
}

2
drivers/pci/pci.h
View file

@ -569,10 +569,12 @@ int pcie_retrain_link(struct pci_dev *pdev, bool use_lt);
#ifdef CONFIG_PCIEASPM
void pcie_aspm_init_link_state(struct pci_dev *pdev);
void pcie_aspm_exit_link_state(struct pci_dev *pdev);
void pcie_aspm_pm_state_change(struct pci_dev *pdev);
void pcie_aspm_powersave_config_link(struct pci_dev *pdev);
#else
static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { }
static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { }
static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { }
static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { }
#endif

19
drivers/pci/pcie/aspm.c
View file

@ -1008,6 +1008,25 @@ void pcie_aspm_exit_link_state(struct pci_dev *pdev)
up_read(&pci_bus_sem);
}
/* @pdev: the root port or switch downstream port */
void pcie_aspm_pm_state_change(struct pci_dev *pdev)
{
struct pcie_link_state *link = pdev->link_state;
if (aspm_disabled || !link)
return;
/*
* Devices changed PM state, we should recheck if latency
* meets all functions' requirement
*/
down_read(&pci_bus_sem);
mutex_lock(&aspm_lock);
pcie_update_aspm_capable(link->root);
pcie_config_aspm_path(link);
mutex_unlock(&aspm_lock);
up_read(&pci_bus_sem);
}
void pcie_aspm_powersave_config_link(struct pci_dev *pdev)
{
struct pcie_link_state *link = pdev->link_state;