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path: root/drivers/gpu/drm/i915/intel_lvds.c
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Diffstat (limited to 'drivers/gpu/drm/i915/intel_lvds.c')
-rw-r--r--drivers/gpu/drm/i915/intel_lvds.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index cb5821eb59b..b819c108114 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -96,7 +96,7 @@ static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
static void intel_lvds_set_power(struct drm_device *dev, bool on)
{
struct drm_i915_private *dev_priv = dev->dev_private;
- u32 pp_status, ctl_reg, status_reg, lvds_reg;
+ u32 ctl_reg, status_reg, lvds_reg;
if (HAS_PCH_SPLIT(dev)) {
ctl_reg = PCH_PP_CONTROL;
@@ -114,9 +114,8 @@ static void intel_lvds_set_power(struct drm_device *dev, bool on)
I915_WRITE(ctl_reg, I915_READ(ctl_reg) |
POWER_TARGET_ON);
- do {
- pp_status = I915_READ(status_reg);
- } while ((pp_status & PP_ON) == 0);
+ if (wait_for(I915_READ(status_reg) & PP_ON, 1000, 0))
+ DRM_ERROR("timed out waiting to enable LVDS pipe");
intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
} else {
@@ -124,9 +123,8 @@ static void intel_lvds_set_power(struct drm_device *dev, bool on)
I915_WRITE(ctl_reg, I915_READ(ctl_reg) &
~POWER_TARGET_ON);
- do {
- pp_status = I915_READ(status_reg);
- } while (pp_status & PP_ON);
+ if (wait_for((I915_READ(status_reg) & PP_ON) == 0, 1000, 0))
+ DRM_ERROR("timed out waiting for LVDS pipe to turn off");
I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
POSTING_READ(lvds_reg);