diff options
| author | Daisuke Nojiri <dnojiri@chromium.org> | 2018-06-11 18:46:22 -0700 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2018-07-10 09:45:54 -0700 |
| commit | ba4c0cf0558bc6966c4c7f358fbeb5b87c2e8745 (patch) | |
| tree | dfcaef74480fb61e9f55e8fe2d4c1ce480e45351 /chip | |
| parent | 9ed36f03825946dbe4edbf40851d64f5da10f1fe (diff) | |
| download | chrome-ec-ba4c0cf0558bc6966c4c7f358fbeb5b87c2e8745.tar.gz | |
npcx: Enable PWM when starting to spin fans
Currently, the EC disables PWM for the fan with PWM=0 but it doesn't
enable PWM when PWM goes up.
This patch ensures the corresponding PWM channel is enabled when the EC
starts spinnning a fan.
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
BUG=b:109951096
BRANCH=none
TEST=Verify the followings on Teemo:
1. Fan stops when RPM=0
2. Fan starts spinning when RPM goes up from 0
3. Fan stops when entering S3/S5
4. Fan starts spinning when leaving S3.
Change-Id: I49654df81953dc22eb1e6f34cb6534886fee6343
Reviewed-on: https://chromium-review.googlesource.com/1096547
Commit-Queue: Daisuke Nojiri <dnojiri@chromium.org>
Tested-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1128051
Commit-Ready: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'chip')
| -rw-r--r-- | chip/npcx/fan.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/chip/npcx/fan.c b/chip/npcx/fan.c index c1a8b671b2..c14d4e20ed 100644 --- a/chip/npcx/fan.c +++ b/chip/npcx/fan.c @@ -482,13 +482,18 @@ int fan_get_rpm_target(int ch) */ void fan_set_rpm_target(int ch, int rpm) { - /* If rpm = 0, disable PWM */ - if (rpm == 0) + if (rpm == 0) { + /* If rpm = 0, disable PWM immediately. Why?*/ fan_set_duty(ch, 0); - else if (rpm > fans[ch].rpm->rpm_max) - rpm = fans[ch].rpm->rpm_max; - else if (rpm < fans[ch].rpm->rpm_min) - rpm = fans[ch].rpm->rpm_min; + } else { + /* This is the counterpart of disabling PWM above. */ + if (!fan_get_enabled(ch)) + fan_set_enabled(ch, 1); + if (rpm > fans[ch].rpm->rpm_max) + rpm = fans[ch].rpm->rpm_max; + else if (rpm < fans[ch].rpm->rpm_min) + rpm = fans[ch].rpm->rpm_min; + } /* Set target rpm */ fan_status[ch].rpm_target = rpm; |