sravan/system76-coreboot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

pci_device: Add a helper function for determining if PCI device is wake source

Browse Source 
This change adds a helper function `pci_dev_is_wake_source()` that
checks PME_STATUS and PME_ENABLE bits in PM control and status
register to determine if the given device is the source of wake.

BUG=b:169802515
BRANCH=zork

Change-Id: I06e9530b568543ab2f05a4f38dc5c3a527ff391e
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46030
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Rob Barnes <robbarnes@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
This commit is contained in:
Furquan Shaikh
2020-10-03 16:23:55 -07:00
parent 35a77428b2
commit 494f319be7
2 changed files with 26 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
src/device/pci_device.c
View File

@@ -1643,3 +1643,21 @@ void pci_dev_disable_bus_master(const struct device *dev)
pci_update_config16(dev, PCI_COMMAND, ~PCI_COMMAND_MASTER, 0x0);
}
#endif
bool pci_dev_is_wake_source(const struct device *dev)
{
unsigned int pm_cap;
uint16_t pmcs;
if (dev->path.type != DEVICE_PATH_PCI)
return false;
pm_cap = pci_find_capability(dev, PCI_CAP_ID_PM);
if (!pm_cap)
return false;
pmcs = pci_read_config16(dev, pm_cap + PCI_PM_CTRL);
/* PCI Device is a wake source if PME_ENABLE and PME_STATUS are set in PMCS register. */
return (pmcs & PCI_PM_CTRL_PME_ENABLE) && (pmcs & PCI_PM_CTRL_PME_STATUS);
}