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drm/i915: add some framework for backlight bl_power support

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Make backlight class sysfs bl_power a sub-state of backlight enabled, if
a backlight power connector callback is defined. It's up to the
connector callback to handle the sub-state, typically in a way that
respects panel power sequencing.

v2: Post the version that does not oops. *facepalm*.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed_by: Clinton Taylor <Clinton.A.Taylor@intel.com>
Tested_by: Clinton Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jani Nikula 2014-08-13 12:10:12 +03:00 committed by Daniel Vetter
parent 1250d107cf
commit ab656bb901
2 changed files with 28 additions and 0 deletions
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2
drivers/gpu/drm/i915/intel_drv.h
View File

@ -179,6 +179,8 @@ struct intel_panel {
bool active_low_pwm;
struct backlight_device *device;
} backlight;
void (*backlight_power)(struct intel_connector *, bool enable);
};
struct intel_connector {

26
drivers/gpu/drm/i915/intel_panel.c
View File

@ -751,6 +751,8 @@ void intel_panel_disable_backlight(struct intel_connector *connector)
spin_lock_irqsave(&dev_priv->backlight_lock, flags);
if (panel->backlight.device)
panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
panel->backlight.enabled = false;
dev_priv->display.disable_backlight(connector);
@ -957,6 +959,8 @@ void intel_panel_enable_backlight(struct intel_connector *connector)
dev_priv->display.enable_backlight(connector);
panel->backlight.enabled = true;
if (panel->backlight.device)
panel->backlight.device->props.power = FB_BLANK_UNBLANK;
spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
}
@ -965,6 +969,7 @@ void intel_panel_enable_backlight(struct intel_connector *connector)
static int intel_backlight_device_update_status(struct backlight_device *bd)
{
struct intel_connector *connector = bl_get_data(bd);
struct intel_panel *panel = &connector->panel;
struct drm_device *dev = connector->base.dev;
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
@ -972,6 +977,22 @@ static int intel_backlight_device_update_status(struct backlight_device *bd)
bd->props.brightness, bd->props.max_brightness);
intel_panel_set_backlight(connector, bd->props.brightness,
bd->props.max_brightness);
/*
* Allow flipping bl_power as a sub-state of enabled. Sadly the
* backlight class device does not make it easy to to differentiate
* between callbacks for brightness and bl_power, so our backlight_power
* callback needs to take this into account.
*/
if (panel->backlight.enabled) {
if (panel->backlight_power) {
bool enable = bd->props.power == FB_BLANK_UNBLANK;
panel->backlight_power(connector, enable);
}
} else {
bd->props.power = FB_BLANK_POWERDOWN;
}
drm_modeset_unlock(&dev->mode_config.connection_mutex);
return 0;
}
@ -1023,6 +1044,11 @@ static int intel_backlight_device_register(struct intel_connector *connector)
panel->backlight.level,
props.max_brightness);
if (panel->backlight.enabled)
props.power = FB_BLANK_UNBLANK;
else
props.power = FB_BLANK_POWERDOWN;
/*
* Note: using the same name independent of the connector prevents
* registration of multiple backlight devices in the driver.