On Tue, Nov 15, 2005 at 10:31:17PM -0500, Adam Belay wrote:
> +int pci_setup_device_pm(struct pci_dev *dev)
Care to give kernel doc for this new function?
> +{
> + int pm;
> + u16 pmcsr, pmc;
> + struct pci_dev_pm *pm_data;
> +
> + pm = pci_find_capability(dev, PCI_CAP_ID_PM);
> + if (!pm) {
> + dev->current_state = PCI_D0;
> + return 0;
> + }
> +
> + pci_read_config_word(dev,pm + PCI_PM_PMC,&pmc);
> +
> + if ((pmc & PCI_PM_CAP_VER_MASK) > 3) {
> + printk(KERN_DEBUG
> + "PCI: %s has unsupported PM cap regs version (%u)\n",
> + pci_name(dev), pmc & PCI_PM_CAP_VER_MASK);
> + return -EIO;
> + }
> +
> + dev->pm = pm_data = kmalloc(sizeof(struct pci_dev_pm), GFP_KERNEL);
> + if (!pm_data)
> + return -ENOMEM;
> +
> + memset(pm_data, 0, sizeof(struct pci_dev_pm));
> +
> + pm_data->pm_offset = pm;
> +
> + /* determine supported device states */
> + /* all PM capable devices support at least D0 and D3 */
> + pm_data->state_mask |= ((1 << PCI_D0) | (1 << PCI_D3hot));
> + if (pmc & PCI_PM_CAP_D1)
> + pm_data->state_mask |= (1 << PCI_D1);
> + if (pmc & PCI_PM_CAP_D2)
> + pm_data->state_mask |= (1 << PCI_D2);
> +
> + /* PME capabilities */
> + pm_data->pme_mask = ((pmc & PCI_PM_CAP_PME_MASK)
> + >> (ffs(PCI_PM_CAP_PME_MASK) - 1));
> +
> + pci_read_config_word(dev, pm + PCI_PM_CTRL, &pmcsr);
> +
> + /* device context retention */
> + pm_data->dsi = (pmc & PCI_PM_CAP_DSI) ? 1 : 0;
> + pm_data->no_soft_reset = (pmcsr & PCI_PM_CTRL_NO_SOFT_RESET) ? 1 : 0;
> +
> + dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
> +
> + return 0;
> +}
> --- a/drivers/pci/probe.c 2005-11-07 08:08:00.000000000 -0500
> +++ b/drivers/pci/probe.c 2005-11-07 08:05:10.000000000 -0500
> @@ -601,8 +601,7 @@
> pr_debug("PCI: Found %s [%04x/%04x] %06x %02x\n", pci_name(dev),
> dev->vendor, dev->device, class, dev->hdr_type);
>
> - /* "Unknown power state" */
> - dev->current_state = PCI_UNKNOWN;
> + pci_setup_device_pm(dev);
>
> /* Early fixups, before probing the BARs */
> pci_fixup_device(pci_fixup_early, dev);
> --- a/include/linux/pci.h 2005-11-07 08:08:00.000000000 -0500
> +++ b/include/linux/pci.h 2005-11-07 08:02:55.000000000 -0500
> @@ -68,6 +68,18 @@
> #define DEVICE_COUNT_COMPATIBLE 4
> #define DEVICE_COUNT_RESOURCE 12
>
> +struct pci_dev_pm {
> + unsigned int pm_offset; /* the PCI PM capability offset */
> +
> + unsigned int dsi:1; /* vendor-specific initialization needed
> + after a reset */
> + unsigned int no_soft_reset:1; /* PCI config context retained when
> + going from D3_hot to D0 */
> +
> + unsigned char state_mask; /* a mask of supported power states */
> + unsigned char pme_mask; /* a mask of power states that allow #PME */
Trailing space, use quilt it strips this :)
> + struct pci_dev_pm *pm; /* power management information */
Why make this a pointer and not just part of this structure? Don't all
pci devices need this?
thanks,
greg k-h
-
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