drm/i915/panel: Only record the backlight level when it is enabled

By tracking the current status of the backlight we can prevent recording
the value of the current backlight when we have disabled it. And so
prevent restoring it to 'off' after an unbalanced sequence of
intel_lvds_disable/enable.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=22672
Tested-by: Alex Riesen <raa.lkml@gmail.com>
Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
This commit is contained in:
Chris Wilson 2011-01-11 17:06:04 +00:00
Родитель 97aaf91073
Коммит 47356eb672
5 изменённых файлов: 39 добавлений и 8 удалений

Просмотреть файл

@ -332,6 +332,7 @@ typedef struct drm_i915_private {
/* LVDS info */
int backlight_level; /* restore backlight to this value */
bool backlight_enabled;
struct drm_display_mode *panel_fixed_mode;
struct drm_display_mode *lfp_lvds_vbt_mode; /* if any */
struct drm_display_mode *sdvo_lvds_vbt_mode; /* if any */

Просмотреть файл

@ -5802,6 +5802,8 @@ static void intel_setup_outputs(struct drm_device *dev)
encoder->base.possible_clones =
intel_encoder_clones(dev, encoder->clone_mask);
}
intel_panel_setup_backlight(dev);
}
static void intel_user_framebuffer_destroy(struct drm_framebuffer *fb)

Просмотреть файл

@ -257,6 +257,9 @@ extern void intel_pch_panel_fitting(struct drm_device *dev,
extern u32 intel_panel_get_max_backlight(struct drm_device *dev);
extern u32 intel_panel_get_backlight(struct drm_device *dev);
extern void intel_panel_set_backlight(struct drm_device *dev, u32 level);
extern void intel_panel_setup_backlight(struct drm_device *dev);
extern void intel_panel_enable_backlight(struct drm_device *dev);
extern void intel_panel_disable_backlight(struct drm_device *dev);
extern void intel_crtc_load_lut(struct drm_crtc *crtc);
extern void intel_encoder_prepare (struct drm_encoder *encoder);

Просмотреть файл

@ -106,7 +106,7 @@ static void intel_lvds_enable(struct intel_lvds *intel_lvds)
I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
POSTING_READ(lvds_reg);
intel_panel_set_backlight(dev, dev_priv->backlight_level);
intel_panel_enable_backlight(dev);
}
static void intel_lvds_disable(struct intel_lvds *intel_lvds)
@ -123,8 +123,7 @@ static void intel_lvds_disable(struct intel_lvds *intel_lvds)
lvds_reg = LVDS;
}
dev_priv->backlight_level = intel_panel_get_backlight(dev);
intel_panel_set_backlight(dev, 0);
intel_panel_disable_backlight(dev);
I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
@ -398,8 +397,6 @@ static void intel_lvds_prepare(struct drm_encoder *encoder)
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
dev_priv->backlight_level = intel_panel_get_backlight(dev);
/* We try to do the minimum that is necessary in order to unlock
* the registers for mode setting.
*
@ -430,9 +427,6 @@ static void intel_lvds_commit(struct drm_encoder *encoder)
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
if (dev_priv->backlight_level == 0)
dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
/* Undo any unlocking done in prepare to prevent accidental
* adjustment of the registers.
*/

Просмотреть файл

@ -250,3 +250,34 @@ void intel_panel_set_backlight(struct drm_device *dev, u32 level)
tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;
I915_WRITE(BLC_PWM_CTL, tmp | level);
}
void intel_panel_disable_backlight(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
if (dev_priv->backlight_enabled) {
dev_priv->backlight_level = intel_panel_get_backlight(dev);
dev_priv->backlight_enabled = false;
}
intel_panel_set_backlight(dev, 0);
}
void intel_panel_enable_backlight(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
if (dev_priv->backlight_level == 0)
dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
intel_panel_set_backlight(dev, dev_priv->backlight_level);
dev_priv->backlight_enabled = true;
}
void intel_panel_setup_backlight(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
dev_priv->backlight_enabled = dev_priv->backlight_level != 0;
}