|PCI_REPORT_PMCAP(9F)||Kernel Functions for Drivers||PCI_REPORT_PMCAP(9F)|
#include <sys/ddi.h> #include <sys/sunddi.h> int pci_report_pmcap(dev_info_t *dip, int cap, void *arg);
PCI_PM_IDLESPEED — The PCI_PM_IDLESPEED value indicates the lowest PCI clock speed that a device can tolerate when idle, and is applicable only to 33 MHz PCI bus. arg represents the lowest possible idle speed in KHz (1 KHz is 1000 Hz). The integer value representing the speed should be cast to (void *)before passing as arg to pci_report_pmcap().
The special values of arg are:
If the driver doesn't make this call, PCI_PM_IDLESPEED_NONE is assumed. In this case, one offending device can keep the entire bus from being power managed.
if (pci_report_pmcap(dip, PCI_PM_IDLESPEED, PCI_PM_IDLESPEED_ANY) != DDI_SUCCESS) cmn_err(CE_WARN, "%s%d: pci_report_pmcap failed\n", ddi_driver_name(dip), ddi_get_instance(dip));
2. A device driver controls a 10/100 Mb Ethernet device which runs the device state machine on the chip from the PCI clock. For the device state machine to receive packets at 100 Mb, the PCI clock cannot drop below 4 MHz. The driver makes the following call whenever it negotiates a 100 Mb Ethernet connection:
if (pci_report_pmcap(dip, PCI_PM_IDLESPEED, (void *)4000) != DDI_SUCCESS) cmn_err(CE_WARN, "%s%d: pci_report_pmcap failed\n", ddi_driver_name(dip), ddi_get_instance(dip));
|ATTRIBUTE TYPE||ATTRIBUTE VALUE|
PCI Bus Power Management Interface Specification Version 1.1
PCI Bus Specification Revision 2.1
|August 13, 1999||OmniOS|