diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_panel.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_panel.c | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index 7180cc828f94..58c7ee7238b8 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -287,9 +287,18 @@ void intel_panel_disable_backlight(struct drm_device *dev) dev_priv->backlight_enabled = false; intel_panel_actually_set_backlight(dev, 0); + + if (INTEL_INFO(dev)->gen >= 4) { + uint32_t reg; + + reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; + + I915_WRITE(reg, I915_READ(reg) & ~BLM_PWM_ENABLE); + } } -void intel_panel_enable_backlight(struct drm_device *dev) +void intel_panel_enable_backlight(struct drm_device *dev, + enum pipe pipe) { struct drm_i915_private *dev_priv = dev->dev_private; @@ -298,6 +307,33 @@ void intel_panel_enable_backlight(struct drm_device *dev) dev_priv->backlight_enabled = true; intel_panel_actually_set_backlight(dev, dev_priv->backlight_level); + + if (INTEL_INFO(dev)->gen >= 4) { + uint32_t reg, tmp; + + reg = HAS_PCH_SPLIT(dev) ? BLC_PWM_CPU_CTL2 : BLC_PWM_CTL2; + + + tmp = I915_READ(reg); + + /* Note that this can also get called through dpms changes. And + * we don't track the backlight dpms state, hence check whether + * we have to do anything first. */ + if (tmp & BLM_PWM_ENABLE) + return; + + if (dev_priv->num_pipe == 3) + tmp &= ~BLM_PIPE_SELECT_IVB; + else + tmp &= ~BLM_PIPE_SELECT; + + tmp |= BLM_PIPE(pipe); + tmp &= ~BLM_PWM_ENABLE; + + I915_WRITE(reg, tmp); + POSTING_READ(reg); + I915_WRITE(reg, tmp | BLM_PWM_ENABLE); + } } static void intel_panel_init_backlight(struct drm_device *dev) |