diff options
Diffstat (limited to 'chip/lm4/fan.c')
| -rw-r--r-- | chip/lm4/fan.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/chip/lm4/fan.c b/chip/lm4/fan.c index 8ec25bc1f8..1180d51906 100644 --- a/chip/lm4/fan.c +++ b/chip/lm4/fan.c @@ -132,7 +132,9 @@ int fan_is_stalled(int ch) void fan_channel_setup(int ch, unsigned int flags) { - if (flags & FAN_USE_RPM_MODE) { + uint32_t init; + + if (flags & FAN_USE_RPM_MODE) /* * Configure automatic/feedback mode: * 0x8000 = bit 15 = auto-restart @@ -146,8 +148,8 @@ void fan_channel_setup(int ch, unsigned int flags) * (see note at top of file) * 0x0000 = bit 0 = automatic control */ - LM4_FAN_FANCH(ch) = 0x802c; - } else { + init = 0x802c; + else /* * Configure drive-only mode: * 0x0000 = bit 15 = no auto-restart @@ -159,8 +161,17 @@ void fan_channel_setup(int ch, unsigned int flags) * 0x0000 = bits 3:2 = 1 pulses per revolution * 0x0001 = bit 0 = manual control */ - LM4_FAN_FANCH(ch) = 0x0001; - } + init = 0x0001; + + if (flags & FAN_USE_FAST_START) + /* + * Configure fast-start mode + * 0x0000 = bits 10:8 = start period (2<<0) edges + * 0x0040 = bits 7:6 = fast start at 50% duty + */ + init |= 0x0040; + + LM4_FAN_FANCH(ch) = init; } static void fan_init(void) |