Messages in this thread Patch in this message | | | Subject | [PATCH 9/9] PCI PM: generic suspend/resume fixes | From | Adam Belay <> | Date | Mon, 05 Jun 2006 04:46:18 -0400 |
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Some drivers never call pci_enable_device() or pci_enable_master() and instead assume the bios will have initialized the device. As a workaround, this patch modifies the generic resume function to verify which device features need to be enabled by checking the previous state of the COMMAND register. Also, pci_disable_device() is now called during generic suspend.
Signed-off-by: Adam Belay <abelay@novell.com>
--- pci-driver.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-)
diff -urN a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c --- a/drivers/pci/pci-driver.c 2006-05-30 21:41:14.000000000 -0400 +++ b/drivers/pci/pci-driver.c 2006-06-05 00:29:24.000000000 -0400 @@ -265,6 +265,16 @@ return 0; } +/* + * Default suspend method for devices that have no driver provided suspend, + * or not even a driver at all. + */ +static void pci_default_suspend(struct pci_dev *pci_dev) +{ + pci_save_state(pci_dev); + pci_disable_device(pci_dev); +} + static int pci_device_suspend(struct device * dev, pm_message_t state) { struct pci_dev * pci_dev = to_pci_dev(dev); @@ -274,13 +284,11 @@ if (drv && drv->suspend) { i = drv->suspend(pci_dev, state); suspend_report_result(drv->suspend, i); - } else { - pci_save_state(pci_dev); - } + } else + pci_default_suspend(pci_dev); return i; } - /* * Default resume method for devices that have no driver provided resume, * or not even a driver at all. @@ -288,14 +296,15 @@ static void pci_default_resume(struct pci_dev *pci_dev) { int retval; + u16 cmd = pci_dev->saved_config.command; /* restore the PCI config space */ pci_restore_state(pci_dev); /* if the device was enabled before suspend, reenable */ - if (pci_dev->is_enabled) + if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) retval = pci_enable_device(pci_dev); /* if the device was busmaster before the suspend, make it busmaster again */ - if (pci_dev->is_busmaster) + if (cmd & PCI_COMMAND_MASTER) pci_set_master(pci_dev); }
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