From 637088a21e204b129a03dbd59bc0cd80d0292651 Mon Sep 17 00:00:00 2001 From: Hans de Goede <hdegoede@redhat.com> Date: Sun, 21 Nov 2021 12:00:32 +0100 Subject: [PATCH] drm/i915/backlight: Make ext_pwm_disable_backlight() call intel_backlight_set_pwm_level() At least the Bay Trail LPSS PWM controller used with DSI panels on many Bay Trail tablets seems to leave the PWM pin in whatever state it was (high or low) ATM that the PWM gets disabled. Combined with some panels not having a separate backlight-enable pin this leads to the backlight sometimes staying on while it should not (when the pin was high during PWM-disabling). First calling intel_backlight_set_pwm_level() will ensure that the pin is always low (or high for inverted brightness panels) since the passed in duty-cycle is 0% (or 100%) when the PWM gets disabled fixing the backlight sometimes staying on. With the exception of ext_pwm_disable_backlight() all other foo_disable_backlight() functions call intel_backlight_set_pwm_level() already before disabling the backlight, so this change also aligns ext_pwm_disable_backlight() with all the other disable() functions. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Lyude Paul <lyude@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211121110032.4720-2-hdegoede@redhat.com --- drivers/gpu/drm/i915/display/intel_backlight.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_backlight.c b/drivers/gpu/drm/i915/display/intel_backlight.c index 9523411cddd8c..2db3b792aca63 100644 --- a/drivers/gpu/drm/i915/display/intel_backlight.c +++ b/drivers/gpu/drm/i915/display/intel_backlight.c @@ -433,6 +433,8 @@ static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn struct intel_connector *connector = to_intel_connector(old_conn_state->connector); struct intel_panel *panel = &connector->panel; + intel_backlight_set_pwm_level(old_conn_state, level); + panel->backlight.pwm_state.enabled = false; pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state); } -- GitLab