drm/i915: Eliminate lots of WARNs when there's no backlight present

My 855gm doesn't register the intel backlight but it still ends up
calling the backlight code to enable/disable the backlight via the
LVDS code. This leads to some WARNs due to backlight.max being 0.

Let's have intel_panel_enable_backlight() and intel_panel_disable_backlight()
check whether there's a backlight present or not.

Also move the backlight.present check from asle_set_backlight() into
intel_panel_set_backlight() for some extra symmetry.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index 3da259e..37e9a96 100644 (file)
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -396,9 +396,7 @@ int intel_opregion_notify_adapter(struct drm_device *dev, pci_power_t state)
 static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
-       struct drm_connector *connector;
        struct intel_connector *intel_connector;
-       struct intel_panel *panel;
        struct opregion_asle __iomem *asle = dev_priv->opregion.asle;
 
        DRM_DEBUG_DRIVER("bclp = 0x%08x\n", bclp);
@@ -417,12 +415,8 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
         * only one).
         */
        DRM_DEBUG_KMS("updating opregion backlight %d/255\n", bclp);
-       list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
-               intel_connector = to_intel_connector(connector);
-               panel = &intel_connector->panel;
-               if (panel->backlight.present)
-                       intel_panel_set_backlight(intel_connector, bclp, 255);
-       }
+       list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head)
+               intel_panel_set_backlight(intel_connector, bclp, 255);
        iowrite32(DIV_ROUND_UP(bclp * 100, 255) | ASLE_CBLV_VALID, &asle->cblv);
 
        mutex_unlock(&dev->mode_config.mutex);

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 20ebc3e..350de35 100644 (file)
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -502,7 +502,7 @@ void intel_panel_set_backlight(struct intel_connector *connector, u32 level,
        u32 freq;
        unsigned long flags;
 
-       if (pipe == INVALID_PIPE)
+       if (!panel->backlight.present || pipe == INVALID_PIPE)
                return;
 
        spin_lock_irqsave(&dev_priv->backlight_lock, flags);
@@ -579,7 +579,7 @@ void intel_panel_disable_backlight(struct intel_connector *connector)
        enum pipe pipe = intel_get_pipe_from_connector(connector);
        unsigned long flags;
 
-       if (pipe == INVALID_PIPE)
+       if (!panel->backlight.present || pipe == INVALID_PIPE)
                return;
 
        /*
@@ -782,7 +782,7 @@ void intel_panel_enable_backlight(struct intel_connector *connector)
        enum pipe pipe = intel_get_pipe_from_connector(connector);
        unsigned long flags;
 
-       if (pipe == INVALID_PIPE)
+       if (!panel->backlight.present || pipe == INVALID_PIPE)
                return;
 
        DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));