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authorJesse Barnes <jbarnes@virtuousgeek.org>2012-04-11 09:23:35 -0700
committerDaniel Vetter <daniel.vetter@ffwll.ch>2012-04-12 21:14:12 +0200
commitf82cfb6bcda164ef3a66b8c3fc549b1f9bdd09ad (patch)
treebb39ff02a2a1c8fde1ace1a1e2411c04e5807072 /drivers/gpu/drm/i915/intel_display.c
parentb6834bd63ec407444098be233122a25bf4f17c75 (diff)
downloadlwn-f82cfb6bcda164ef3a66b8c3fc549b1f9bdd09ad.tar.gz
lwn-f82cfb6bcda164ef3a66b8c3fc549b1f9bdd09ad.zip
drm/i915: allow PCH PWM override on IVB
On IVB, there are two sets of panel backlight regs: one in the CPU and one in the PCH. The CPU ones aren't generally used, so on IVB make sure we allow the PCH regs to actually control the backlight. v2: remove unused pwm variable (Daniel) move to init_hw function so we override on resume too Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_display.c')
-rw-r--r--drivers/gpu/drm/i915/intel_display.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 58f4b02151f2..33aaad30c0bc 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9530,6 +9530,19 @@ static void i915_disable_vga(struct drm_device *dev)
POSTING_READ(vga_reg);
}
+static void ivb_pch_pwm_override(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ /*
+ * IVB has CPU eDP backlight regs too, set things up to let the
+ * PCH regs control the backlight
+ */
+ I915_WRITE(BLC_PWM_CPU_CTL2, PWM_ENABLE);
+ I915_WRITE(BLC_PWM_CPU_CTL, 0);
+ I915_WRITE(BLC_PWM_PCH_CTL1, PWM_ENABLE | (1<<30));
+}
+
void intel_modeset_init_hw(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -9545,6 +9558,9 @@ void intel_modeset_init_hw(struct drm_device *dev)
gen6_enable_rps(dev_priv);
gen6_update_ring_freq(dev_priv);
}
+
+ if (IS_IVYBRIDGE(dev))
+ ivb_pch_pwm_override(dev);
}
void intel_modeset_init(struct drm_device *dev)