drm/i915: apply phase pointer override on SNB+ too

These bits moved around on SNB and above.

v2: again with the git send-email fail
v3: add macros for getting per-pipe override & enable bits
v4: enable phase sync pointer on SNB and IVB configs as well

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 30d8aae..a7f7a34 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3091,6 +3091,11 @@
 #define TRANS_CHICKEN2(pipe) _PIPE(pipe, _TRANSA_CHICKEN2, _TRANSB_CHICKEN2)
 #define   TRANS_AUTOTRAIN_GEN_STALL_DIS        (1<<31)
 
+#define SOUTH_CHICKEN1         0xc2000
+#define  FDIA_PHASE_SYNC_SHIFT_OVR     19
+#define  FDIA_PHASE_SYNC_SHIFT_EN      18
+#define FDI_PHASE_SYNC_OVR(pipe) (1<<(FDIA_PHASE_SYNC_SHIFT_OVR - ((pipe) * 2)))
+#define FDI_PHASE_SYNC_EN(pipe) (1<<(FDIA_PHASE_SYNC_SHIFT_EN - ((pipe) * 2)))
 #define SOUTH_CHICKEN2         0xc2004
 #define  DPLS_EDP_PPS_FIX_DIS  (1<<0)
 

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 3d2900c..5316460 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2113,6 +2113,18 @@ static void intel_fdi_normal_train(struct drm_crtc *crtc)
                           FDI_FE_ERRC_ENABLE);
 }
 
+static void cpt_phase_pointer_enable(struct drm_device *dev, int pipe)
+{
+       struct drm_i915_private *dev_priv = dev->dev_private;
+       u32 flags = I915_READ(SOUTH_CHICKEN1);
+
+       flags |= FDI_PHASE_SYNC_OVR(pipe);
+       I915_WRITE(SOUTH_CHICKEN1, flags); /* once to unlock... */
+       flags |= FDI_PHASE_SYNC_EN(pipe);
+       I915_WRITE(SOUTH_CHICKEN1, flags); /* then again to enable */
+       POSTING_READ(SOUTH_CHICKEN1);
+}
+
 /* The FDI link training functions for ILK/Ibexpeak. */
 static void ironlake_fdi_link_train(struct drm_crtc *crtc)
 {
@@ -2263,6 +2275,9 @@ static void gen6_fdi_link_train(struct drm_crtc *crtc)
        POSTING_READ(reg);
        udelay(150);
 
+       if (HAS_PCH_CPT(dev))
+               cpt_phase_pointer_enable(dev, pipe);
+
        for (i = 0; i < 4; i++ ) {
                reg = FDI_TX_CTL(pipe);
                temp = I915_READ(reg);
@@ -2379,6 +2394,9 @@ static void ivb_manual_fdi_link_train(struct drm_crtc *crtc)
        POSTING_READ(reg);
        udelay(150);
 
+       if (HAS_PCH_CPT(dev))
+               cpt_phase_pointer_enable(dev, pipe);
+
        for (i = 0; i < 4; i++ ) {
                reg = FDI_TX_CTL(pipe);
                temp = I915_READ(reg);
@@ -2488,6 +2506,17 @@ static void ironlake_fdi_pll_enable(struct drm_crtc *crtc)
        }
 }
 
+static void cpt_phase_pointer_disable(struct drm_device *dev, int pipe)
+{
+       struct drm_i915_private *dev_priv = dev->dev_private;
+       u32 flags = I915_READ(SOUTH_CHICKEN1);
+
+       flags &= ~(FDI_PHASE_SYNC_EN(pipe));
+       I915_WRITE(SOUTH_CHICKEN1, flags); /* once to disable... */
+       flags &= ~(FDI_PHASE_SYNC_OVR(pipe));
+       I915_WRITE(SOUTH_CHICKEN1, flags); /* then again to lock */
+       POSTING_READ(SOUTH_CHICKEN1);
+}
 static void ironlake_fdi_disable(struct drm_crtc *crtc)
 {
        struct drm_device *dev = crtc->dev;
@@ -2517,6 +2546,8 @@ static void ironlake_fdi_disable(struct drm_crtc *crtc)
                I915_WRITE(FDI_RX_CHICKEN(pipe),
                           I915_READ(FDI_RX_CHICKEN(pipe) &
                                     ~FDI_RX_PHASE_SYNC_POINTER_EN));
+       } else if (HAS_PCH_CPT(dev)) {
+               cpt_phase_pointer_disable(dev, pipe);
        }
 
        /* still set train pattern 1 */