From 6f06ce184c765fd8d50669a8d12fdd566c920859 Mon Sep 17 00:00:00 2001 From: Jesse Barnes Date: Tue, 4 Jan 2011 15:09:38 -0800 Subject: [PATCH] drm/i915: set phase sync pointer override enable before setting phase sync pointer We need to unlock the phase sync pointer enable bit before we can actually enable the phase sync pointer workaround on Ironlake. Signed-off-by: Jesse Barnes Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/i915_reg.h | 3 ++- drivers/gpu/drm/i915/intel_display.c | 12 +++++++++--- 2 files changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 53ddacc907b9..e6b106bb87b6 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -3005,7 +3005,8 @@ #define FDI_RXA_CHICKEN 0xc200c #define FDI_RXB_CHICKEN 0xc2010 -#define FDI_RX_PHASE_SYNC_POINTER_ENABLE (1) +#define FDI_RX_PHASE_SYNC_POINTER_OVR (1<<1) +#define FDI_RX_PHASE_SYNC_POINTER_EN (1<<0) #define FDI_RX_CHICKEN(pipe) _PIPE(pipe, FDI_RXA_CHICKEN, FDI_RXB_CHICKEN) #define SOUTH_DSPCLK_GATE_D 0xc2020 diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index aee2abae81ec..2842dbe3ec0d 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -2273,7 +2273,11 @@ static void ironlake_fdi_link_train(struct drm_crtc *crtc) udelay(150); /* Ironlake workaround, enable clock pointer after FDI enable*/ - I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_ENABLE); + if (HAS_PCH_IBX(dev)) { + I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR); + I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR | + FDI_RX_PHASE_SYNC_POINTER_EN); + } reg = FDI_RX_IIR(pipe); for (tries = 0; tries < 5; tries++) { @@ -2516,10 +2520,12 @@ static void ironlake_fdi_disable(struct drm_crtc *crtc) udelay(100); /* Ironlake workaround, disable clock pointer after downing FDI */ - if (HAS_PCH_IBX(dev)) + if (HAS_PCH_IBX(dev)) { + I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR); I915_WRITE(FDI_RX_CHICKEN(pipe), I915_READ(FDI_RX_CHICKEN(pipe) & - ~FDI_RX_PHASE_SYNC_POINTER_ENABLE)); + ~FDI_RX_PHASE_SYNC_POINTER_EN)); + } /* still set train pattern 1 */ reg = FDI_TX_CTL(pipe); -- 2.34.1