Commit 5c0d0ee3 authored by Sean Christopherson's avatar Sean Christopherson Committed by Bjorn Helgaas
Browse files

PCI: Support Immediate Readiness on devices without PM capabilities 



Query support for Immediate Readiness irrespective of whether or not the
device supports PM capabilities, as nothing in the PCIe spec suggests that
Immediate Readiness is in any way dependent on PM functionality.

Fixes: d6112f8d ("PCI: Add support for Immediate Readiness")
Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Cc: David Matlack <dmatlack@google.com>
Cc: Vipin Sharma <vipinsh@google.com>
Cc: Aaron Lewis <aaronlewis@google.com>
Link: https://patch.msgid.link/20250722155926.352248-1-seanjc@google.com
parent 91703041

drivers/pci/pci.c

+0 −4
Original line number Diff line number Diff line
@@ -3205,7 +3205,6 @@ void pci_pm_power_up_and_verify_state(struct pci_dev *pci_dev) 
void pci_pm_init(struct pci_dev *dev)

{

	int pm;

	u16 status;

	u16 pmc;



	device_enable_async_suspend(&dev->dev);
@@ -3266,9 +3265,6 @@ void pci_pm_init(struct pci_dev *dev) 
		pci_pme_active(dev, false);

	}



	pci_read_config_word(dev, PCI_STATUS, &status);

	if (status & PCI_STATUS_IMM_READY)

		dev->imm_ready = 1;

	pci_pm_power_up_and_verify_state(dev);

	pm_runtime_forbid(&dev->dev);

	pm_runtime_set_active(&dev->dev);

drivers/pci/probe.c

+10 −0
Original line number Diff line number Diff line
@@ -2595,6 +2595,15 @@ void pcie_report_downtraining(struct pci_dev *dev) 
	__pcie_print_link_status(dev, false);

}



static void pci_imm_ready_init(struct pci_dev *dev)

{

	u16 status;



	pci_read_config_word(dev, PCI_STATUS, &status);

	if (status & PCI_STATUS_IMM_READY)

		dev->imm_ready = 1;

}



static void pci_init_capabilities(struct pci_dev *dev)

{

	pci_ea_init(dev);		/* Enhanced Allocation */
@@ -2604,6 +2613,7 @@ static void pci_init_capabilities(struct pci_dev *dev) 
	/* Buffers for saving PCIe and PCI-X capabilities */

	pci_allocate_cap_save_buffers(dev);



	pci_imm_ready_init(dev);	/* Immediate Readiness */

	pci_pm_init(dev);		/* Power Management */

	pci_vpd_init(dev);		/* Vital Product Data */

	pci_configure_ari(dev);		/* Alternative Routing-ID Forwarding */