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drm/i915: Refactor panel backlight controls

Telusuri Sumber 
There were two instances of code to control the panel backlight and
neither handled the complete set of device variations.

Fixes:

  Bug 29716 - [GM965] Regression: Backlight resets to minimum when changing resolution
  https://bugs.freedesktop.org/show_bug.cgi?id=29716

And a bug on one of my PineView boxes which overflowed the backlight
value.

Incorporates part of a similar patch by Matthew Garrett that exposes a
native Intel backlight controller.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
2010-08-22 13:18:16 +01:00
orang tua 5d607f9b03
melakukan a957355693
5 mengubah file dengan 125 tambahan dan 108 penghapusan
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56
drivers/gpu/drm/i915/intel_lvds.c
Melihat File

@@ -53,43 +53,6 @@ static struct intel_lvds *enc_to_intel_lvds(struct drm_encoder *encoder)
return container_of(enc_to_intel_encoder(encoder), struct intel_lvds, base);
}
/**
* Sets the backlight level.
*
* \param level backlight level, from 0 to intel_lvds_get_max_backlight().
*/
static void intel_lvds_set_backlight(struct drm_device *dev, int level)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 blc_pwm_ctl, reg;
if (HAS_PCH_SPLIT(dev))
reg = BLC_PWM_CPU_CTL;
else
reg = BLC_PWM_CTL;
blc_pwm_ctl = I915_READ(reg) & ~BACKLIGHT_DUTY_CYCLE_MASK;
I915_WRITE(reg, (blc_pwm_ctl |
(level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
}
/**
* Returns the maximum level of the backlight duty cycle field.
*/
static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 reg;
if (HAS_PCH_SPLIT(dev))
reg = BLC_PWM_PCH_CTL2;
else
reg = BLC_PWM_CTL;
return ((I915_READ(reg) & BACKLIGHT_MODULATION_FREQ_MASK) >>
BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
}
/**
* Sets the power state for the panel.
*/
@@ -117,9 +80,9 @@ static void intel_lvds_set_power(struct drm_device *dev, bool on)
if (wait_for(I915_READ(status_reg) & PP_ON, 1000))
DRM_ERROR("timed out waiting to enable LVDS pipe");
intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
intel_panel_set_backlight(dev, dev_priv->backlight_level);
} else {
intel_lvds_set_backlight(dev, 0);
intel_panel_set_backlight(dev, 0);
I915_WRITE(ctl_reg, I915_READ(ctl_reg) &
~POWER_TARGET_ON);
@@ -386,16 +349,8 @@ static void intel_lvds_prepare(struct drm_encoder *encoder)
{
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 reg;
if (HAS_PCH_SPLIT(dev))
reg = BLC_PWM_CPU_CTL;
else
reg = BLC_PWM_CTL;
dev_priv->saveBLC_PWM_CTL = I915_READ(reg);
dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
BACKLIGHT_DUTY_CYCLE_MASK);
dev_priv->backlight_level = intel_panel_get_backlight(dev);
intel_lvds_set_power(dev, false);
}
@@ -405,9 +360,8 @@ static void intel_lvds_commit( struct drm_encoder *encoder)
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
if (dev_priv->backlight_duty_cycle == 0)
dev_priv->backlight_duty_cycle =
intel_lvds_get_max_backlight(dev);
if (dev_priv->backlight_level == 0)
dev_priv->backlight_level = intel_panel_get_max_backlight(dev);
intel_lvds_set_power(dev, true);
}