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Date: Thu, 14 Jan 2010 14:26:55 -0800 From: Greg Kroah-Hartman <gregkh@...e.de> To: linux-kernel@...r.kernel.org, stable@...nel.org, stable-review@...nel.org Cc: torvalds@...ux-foundation.org, akpm@...ux-foundation.org, Zhao Yakui <yakui.zhao@...el.com>, Eric Anholt <eric@...olt.net>, Greg Kroah-Hartman <gregkh@...e.de> Subject: [PATCH 16/52] drm/i915: Enable/disable the dithering for LVDS based on VBT setting From: Zhao Yakui <yakui.zhao@...el.com> commit 898822ce9561ab9b58a7eb60580a162a83dadecd upstream. 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@...el.com> Signed-off-by: Eric Anholt <eric@...olt.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de> --- drivers/gpu/drm/i915/i915_reg.h | 4 ++++ 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 1687edf..54e5907 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -968,6 +968,8 @@ #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) /* @@ -1737,6 +1739,8 @@ /* 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 f1de53b..2e7e521 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -3104,7 +3104,20 @@ 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_IGDNG(dev)) + pipeconf |= PIPE_ENABLE_DITHER; + else + lvds |= LVDS_ENABLE_DITHER; + } else { + if (IS_IGDNG(dev)) + pipeconf &= ~PIPE_ENABLE_DITHER; + else + lvds &= ~LVDS_ENABLE_DITHER; + } + } I915_WRITE(lvds_reg, lvds); I915_READ(lvds_reg); } -- 1.6.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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