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Only check fan type once. Not only is continuously rechecking pointless, a

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single random failure can reprogram what control mechanism we try to use.

MFC after:	2 weeks
This commit is contained in:
Nathan Whitehorn 2013-05-05 22:42:10 +00:00
parent 6b7724bccf
commit 7f3d2746af
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=250290
1 changed files with 40 additions and 11 deletions
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51
sys/powerpc/powermac/smu.c
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@ -78,8 +78,8 @@ struct smu_fan {
SMU_FAN_RPM,
SMU_FAN_PWM
} type;
int old_style;
int setpoint;
int old_style;
int rpm;
};
@ -123,6 +123,7 @@ struct smu_softc {
struct smu_fan *sc_fans;
int sc_nfans;
int old_style_fans;
struct smu_sensor *sc_sensors;
int sc_nsensors;
@ -653,6 +654,37 @@ doorbell_attach(device_t dev)
* Sensor and fan management
*/
static int
smu_fan_check_old_style(struct smu_fan *fan)
{
device_t smu = fan->dev;
struct smu_softc *sc = device_get_softc(smu);
struct smu_cmd cmd;
int error;
if (sc->old_style_fans != -1)
return (sc->old_style_fans);
/*
* Apple has two fan control mechanisms. We can't distinguish
* them except by seeing if the new one fails. If the new one
* fails, use the old one.
*/
cmd.cmd = SMU_FAN;
cmd.len = 2;
cmd.data[0] = 0x31;
cmd.data[1] = fan->reg;
do {
error = smu_run_cmd(smu, &cmd, 1);
} while (error == EWOULDBLOCK);
sc->old_style_fans = (error != 0);
return (sc->old_style_fans);
}
static int
smu_fan_set_rpm(struct smu_fan *fan, int rpm)
{
@ -667,12 +699,8 @@ smu_fan_set_rpm(struct smu_fan *fan, int rpm)
rpm = max(fan->fan.min_rpm, rpm);
rpm = min(fan->fan.max_rpm, rpm);
/*
* Apple has two fan control mechanisms. We can't distinguish
* them except by seeing if the new one fails. If the new one
* fails, use the old one.
*/
smu_fan_check_old_style(fan);
if (!fan->old_style) {
cmd.len = 4;
cmd.data[0] = 0x30;
@ -683,9 +711,7 @@ smu_fan_set_rpm(struct smu_fan *fan, int rpm)
error = smu_run_cmd(smu, &cmd, 1);
if (error && error != EWOULDBLOCK)
fan->old_style = 1;
}
if (fan->old_style) {
} else {
cmd.len = 14;
cmd.data[0] = 0x00; /* RPM fan. */
cmd.data[1] = 1 << fan->reg;
@ -707,6 +733,8 @@ smu_fan_read_rpm(struct smu_fan *fan)
struct smu_cmd cmd;
int rpm, error;
smu_fan_check_old_style(fan);
if (!fan->old_style) {
cmd.cmd = SMU_FAN;
cmd.len = 2;
@ -944,9 +972,10 @@ smu_count_fans(device_t dev)
child = OF_peer(child)) {
nfans++;
/* When allocated, fill the fan properties. */
if (sc->sc_fans != NULL)
if (sc->sc_fans != NULL) {
smu_fill_fan_prop(dev, child,
nfans - 1);
}
}
}
if (nfans == 0) {