drm/i915: Warn if trying to poke a VLV backlight on invalid pipe

VLV/CHV have backlight controls only on pipes A and B. Bail out
without touching registers that don't exist, and print a warning.

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_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index e18b3f4..ef646b1 100644 (file)
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -521,6 +521,9 @@ static u32 _vlv_get_backlight(struct drm_device *dev, enum pipe pipe)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
 
+       if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
+               return 0;
+
        return I915_READ(VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
 }
 
@@ -602,6 +605,9 @@ static void vlv_set_backlight(struct intel_connector *connector, u32 level)
        enum pipe pipe = intel_get_pipe_from_connector(connector);
        u32 tmp;
 
+       if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
+               return;
+
        tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
        I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 }
@@ -717,6 +723,9 @@ static void vlv_disable_backlight(struct intel_connector *connector)
        enum pipe pipe = intel_get_pipe_from_connector(connector);
        u32 tmp;
 
+       if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
+               return;
+
        intel_panel_actually_set_backlight(connector, 0);
 
        tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
@@ -906,6 +915,9 @@ static void vlv_enable_backlight(struct intel_connector *connector)
        enum pipe pipe = intel_get_pipe_from_connector(connector);
        u32 ctl, ctl2;
 
+       if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
+               return;
+
        ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
        if (ctl2 & BLM_PWM_ENABLE) {
                DRM_DEBUG_KMS("backlight already enabled\n");