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| author | Hans de Goede <hdegoede@redhat.com> | 2020-09-03 13:23:27 +0200 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2020-09-06 15:38:01 +0200 |
| commit | 547d9e9261d294f0a2597d9e9c55ba48f80716ab (patch) | |
| tree | ceb7f144da1e93e5172336a1e9ba5493bef654a3 /drivers/pwm/pwm-lpss-platform.c | |
| parent | d6d54bacb1dd02a31ed9d8e3db028639da292615 (diff) | |
| download | linux-547d9e9261d294f0a2597d9e9c55ba48f80716ab.tar.bz2 | |
pwm: lpss: Remove suspend/resume handlers
PWM controller drivers should not restore the PWM state on resume. The
convention is that PWM consumers do this by calling pwm_apply_state(),
so that it can be done at the exact moment when the consumer needs
the state to be stored, avoiding e.g. backlight flickering.
The only in kernel consumers of the pwm-lpss code, the i915 driver
and the pwm-class sysfs interface code both correctly restore the
state on resume, so there is no need to do this in the pwm-lpss code.
More-over the removed resume handler is buggy, since it blindly
restores the ctrl-register contents without setting the update
bit, which is necessary to get the controller to actually use/apply
the restored base-unit and on-time-div values.
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200903112337.4113-8-hdegoede@redhat.com
Diffstat (limited to 'drivers/pwm/pwm-lpss-platform.c')
| -rw-r--r-- | drivers/pwm/pwm-lpss-platform.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-lpss-platform.c b/drivers/pwm/pwm-lpss-platform.c index 48f34d20aecd..c6502cf7a7af 100644 --- a/drivers/pwm/pwm-lpss-platform.c +++ b/drivers/pwm/pwm-lpss-platform.c @@ -89,7 +89,6 @@ static int pwm_lpss_prepare(struct device *dev) static const struct dev_pm_ops pwm_lpss_platform_pm_ops = { .prepare = pwm_lpss_prepare, - SET_SYSTEM_SLEEP_PM_OPS(pwm_lpss_suspend, pwm_lpss_resume) }; static const struct acpi_device_id pwm_lpss_acpi_match[] = { |