}
}
+/**
+ * scale - scale values from one range to another
+ *
+ * @source_val: value in range [@source_min..@source_max]
+ *
+ * Return @source_val in range [@source_min..@source_max] scaled to range
+ * [@target_min..@target_max].
+ */
+static uint32_t scale(uint32_t source_val,
+ uint32_t source_min, uint32_t source_max,
+ uint32_t target_min, uint32_t target_max)
+{
+ uint64_t target_val;
+
+ WARN_ON(source_min > source_max);
+ WARN_ON(target_min > target_max);
+
+ /* defensive */
+ source_val = clamp(source_val, source_min, source_max);
+
+ /* avoid overflows */
+ target_val = (uint64_t)(source_val - source_min) *
+ (target_max - target_min);
+ do_div(target_val, source_max - source_min);
+ target_val += target_min;
+
+ return target_val;
+}
+
+/* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
+static inline u32 scale_user_to_hw(struct intel_connector *connector,
+ u32 user_level, u32 user_max)
+{
+ struct intel_panel *panel = &connector->panel;
+
+ return scale(user_level, 0, user_max,
+ panel->backlight.min, panel->backlight.max);
+}
+
+/* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
+ * to [hw_min..hw_max]. */
+static inline u32 clamp_user_to_hw(struct intel_connector *connector,
+ u32 user_level, u32 user_max)
+{
+ struct intel_panel *panel = &connector->panel;
+ u32 hw_level;
+
+ hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
+ hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
+
+ return hw_level;
+}
+
+/* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
+static inline u32 scale_hw_to_user(struct intel_connector *connector,
+ u32 hw_level, u32 user_max)
+{
+ struct intel_panel *panel = &connector->panel;
+
+ return scale(hw_level, panel->backlight.min, panel->backlight.max,
+ 0, user_max);
+}
+
static u32 intel_panel_compute_brightness(struct intel_connector *connector,
u32 val)
{
dev_priv->display.set_backlight(connector, level);
}
-/* set backlight brightness to level in range [0..max] */
-void intel_panel_set_backlight(struct intel_connector *connector, u32 level,
- u32 max)
+/* set backlight brightness to level in range [0..max], scaling wrt hw min */
+static void intel_panel_set_backlight(struct intel_connector *connector,
+ u32 user_level, u32 user_max)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
- u32 freq;
+ u32 hw_level;
unsigned long flags;
- u64 n;
if (!panel->backlight.present || pipe == INVALID_PIPE)
return;
WARN_ON(panel->backlight.max == 0);
- /* scale to hardware max, but be careful to not overflow */
- freq = panel->backlight.max;
- n = (u64)level * freq;
- do_div(n, max);
- level = n;
+ hw_level = scale_user_to_hw(connector, user_level, user_max);
+ panel->backlight.level = hw_level;
+
+ if (panel->backlight.enabled)
+ intel_panel_actually_set_backlight(connector, hw_level);
+
+ spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
+}
+
+/* set backlight brightness to level in range [0..max], assuming hw min is
+ * respected.
+ */
+void intel_panel_set_backlight_acpi(struct intel_connector *connector,
+ u32 user_level, u32 user_max)
+{
+ struct drm_device *dev = connector->base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_panel *panel = &connector->panel;
+ enum pipe pipe = intel_get_pipe_from_connector(connector);
+ u32 hw_level;
+ unsigned long flags;
+
+ if (!panel->backlight.present || pipe == INVALID_PIPE)
+ return;
+
+ spin_lock_irqsave(&dev_priv->backlight_lock, flags);
+
+ WARN_ON(panel->backlight.max == 0);
+
+ hw_level = clamp_user_to_hw(connector, user_level, user_max);
+ panel->backlight.level = hw_level;
- panel->backlight.level = level;
if (panel->backlight.device)
- panel->backlight.device->props.brightness = level;
+ panel->backlight.device->props.brightness =
+ scale_hw_to_user(connector,
+ panel->backlight.level,
+ panel->backlight.device->props.max_brightness);
if (panel->backlight.enabled)
- intel_panel_actually_set_backlight(connector, level);
+ intel_panel_actually_set_backlight(connector, hw_level);
spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
}
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);
panel->backlight.level = panel->backlight.max;
if (panel->backlight.device)
panel->backlight.device->props.brightness =
- panel->backlight.level;
+ scale_hw_to_user(connector,
+ panel->backlight.level,
+ panel->backlight.device->props.max_brightness);
}
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);
}
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);
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;
}
struct intel_connector *connector = bl_get_data(bd);
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
+ u32 hw_level;
int ret;
intel_runtime_pm_get(dev_priv);
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
- ret = intel_panel_get_backlight(connector);
+
+ hw_level = intel_panel_get_backlight(connector);
+ ret = scale_hw_to_user(connector, hw_level, bd->props.max_brightness);
+
drm_modeset_unlock(&dev->mode_config.connection_mutex);
intel_runtime_pm_put(dev_priv);
if (WARN_ON(panel->backlight.device))
return -ENODEV;
- BUG_ON(panel->backlight.max == 0);
+ WARN_ON(panel->backlight.max == 0);
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;
- props.brightness = panel->backlight.level;
+
+ /*
+ * Note: Everything should work even if the backlight device max
+ * presented to the userspace is arbitrarily chosen.
+ */
props.max_brightness = panel->backlight.max;
+ props.brightness = scale_hw_to_user(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
* XXX: Query mode clock or hardware clock and program PWM modulation frequency
* appropriately when it's 0. Use VBT and/or sane defaults.
*/
+static u32 get_backlight_min_vbt(struct intel_connector *connector)
+{
+ struct drm_device *dev = connector->base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_panel *panel = &connector->panel;
+
+ WARN_ON(panel->backlight.max == 0);
+
+ /* vbt value is a coefficient in range [0..255] */
+ return scale(dev_priv->vbt.backlight.min_brightness, 0, 255,
+ 0, panel->backlight.max);
+}
+
static int bdw_setup_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
if (!panel->backlight.max)
return -ENODEV;
+ panel->backlight.min = get_backlight_min_vbt(connector);
+
val = bdw_get_backlight(connector);
panel->backlight.level = intel_panel_compute_brightness(connector, val);
if (!panel->backlight.max)
return -ENODEV;
+ panel->backlight.min = get_backlight_min_vbt(connector);
+
val = pch_get_backlight(connector);
panel->backlight.level = intel_panel_compute_brightness(connector, val);
if (!panel->backlight.max)
return -ENODEV;
+ panel->backlight.min = get_backlight_min_vbt(connector);
+
val = i9xx_get_backlight(connector);
panel->backlight.level = intel_panel_compute_brightness(connector, val);
if (!panel->backlight.max)
return -ENODEV;
+ panel->backlight.min = get_backlight_min_vbt(connector);
+
val = i9xx_get_backlight(connector);
panel->backlight.level = intel_panel_compute_brightness(connector, val);
if (!panel->backlight.max)
return -ENODEV;
+ panel->backlight.min = get_backlight_min_vbt(connector);
+
val = _vlv_get_backlight(dev, PIPE_A);
panel->backlight.level = intel_panel_compute_brightness(connector, val);
projects / deliverable / linux.git / blobdiff