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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>
hifive-unleashed-5.1
Ville Syrjälä 2014-11-07 11:15:59 +02:00 committed by Daniel Vetter
parent 6a2c4232ec
commit 23ec0a8835
1 changed files with 12 additions and 0 deletions
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12
drivers/gpu/drm/i915/intel_panel.c
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@ -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");