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Fix the check for acpi_perf(4) so that we verify if it is fully attached

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or just offering info.  In the former case, we don't probe/attach to allow
the ACPI driver precedence.  A refinement of this would be to actually
use the info provided by acpi_perf(4) to get the real CPU clock rates
instead of estimating them but since all systems that support both
acpi_perf(4) and ichss(4) export the control registers to acpi_perf(4),
it can just handle the registers on its own.
This commit is contained in:
Nate Lawson 2005-02-17 01:01:40 +00:00
parent eab1708c9e
commit 6655857ec7
1 changed files with 14 additions and 4 deletions
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18
sys/dev/cpufreq/ichss.c
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@ -209,12 +209,22 @@ ichss_pci_probe(device_t dev)
static int
ichss_probe(device_t dev)
{
struct cf_setting set;
device_t perf_dev;
int count, type;
/* If the ACPI perf driver has attached, let it manage things. */
perf_dev = devclass_get_device(devclass_find("acpi_perf"), 0);
if (perf_dev && device_is_attached(perf_dev))
return (ENXIO);
/*
* If the ACPI perf driver has attached and is not just offering
* info, let it manage things.
*/
perf_dev = device_find_child(device_get_parent(dev), "acpi_perf", -1);
if (perf_dev && device_is_attached(perf_dev)) {
type = 0;
count = 1;
CPUFREQ_DRV_SETTINGS(perf_dev, &set, &count, &type);
if ((type & CPUFREQ_FLAG_INFO_ONLY) == 0)
return (ENXIO);
}
device_set_desc(dev, "SpeedStep ICH");
return (-1000);