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drm/i915: Enable/disable the dithering for LVDS based on VBT setting

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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>
This commit is contained in:
Zhao Yakui 2010-01-04 16:29:30 +08:00 committed by Eric Anholt
parent e3d8affb0d
commit 898822ce95
2 changed files with 18 additions and 1 deletions
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4
drivers/gpu/drm/i915/i915_reg.h
View file

@ -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

15
drivers/gpu/drm/i915/intel_display.c
View file

@ -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);
}