diff options
| author | Zhao Yakui <yakui.zhao@intel.com> | 2010-01-04 16:29:30 +0800 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2010-01-06 09:40:11 -0800 |
| commit | 898822ce9561ab9b58a7eb60580a162a83dadecd (patch) | |
| tree | 753427e34260c563e2f2e9676b760f85cff24bc2 /drivers/gpu/drm/i915 | |
| parent | e3d8affb0d2d95f2da61e30ce86b33177feb91e8 (diff) | |
drm/i915: Enable/disable the dithering for LVDS based on VBT setting
Enable/disable the dithering for LVDS based on VBT setting. On the 965/g4x
platform the dithering flag is defined in LVDS register. And on the ironlake
the dithering flag is defined in pipeconf register.
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'drivers/gpu/drm/i915')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_reg.h | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 15 |
2 files changed, 18 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index f79b13324fa..149d360d64a 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -975,6 +975,8 @@ #define LVDS_PORT_EN (1 << 31) /* Selects pipe B for LVDS data. Must be set on pre-965. */ #define LVDS_PIPEB_SELECT (1 << 30) +/* LVDS dithering flag on 965/g4x platform */ +#define LVDS_ENABLE_DITHER (1 << 25) /* Enable border for unscaled (or aspect-scaled) display */ #define LVDS_BORDER_ENABLE (1 << 15) /* @@ -1744,6 +1746,8 @@ /* Display & cursor control */ +/* dithering flag on Ironlake */ +#define PIPE_ENABLE_DITHER (1 << 4) /* Pipe A */ #define PIPEADSL 0x70000 #define PIPEACONF 0x70008 diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 84705b7e01e..0c9b79f2ab3 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -3195,7 +3195,20 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc, * appropriately here, but we need to look more thoroughly into how * panels behave in the two modes. */ - + /* set the dithering flag */ + if (IS_I965G(dev)) { + if (dev_priv->lvds_dither) { + if (IS_IRONLAKE(dev)) + pipeconf |= PIPE_ENABLE_DITHER; + else + lvds |= LVDS_ENABLE_DITHER; + } else { + if (IS_IRONLAKE(dev)) + pipeconf &= ~PIPE_ENABLE_DITHER; + else + lvds &= ~LVDS_ENABLE_DITHER; + } + } I915_WRITE(lvds_reg, lvds); I915_READ(lvds_reg); } |