drm/i915: Add cherryview_update_wm()

CHV has a third pipe so we need to compute the watermarks for its
planes. Add cherryview_update_wm() to do just that.

v2: Rebase on top of Imre's cxsr changes
v3: Pass crtc to vlv_update_drain_latency()

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 0feeae8..da43e30 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -1399,6 +1399,85 @@ static void valleyview_update_wm(struct drm_crtc *crtc)
                intel_set_memory_cxsr(dev_priv, true);
 }
 
+static void cherryview_update_wm(struct drm_crtc *crtc)
+{
+       struct drm_device *dev = crtc->dev;
+       static const int sr_latency_ns = 12000;
+       struct drm_i915_private *dev_priv = dev->dev_private;
+       int planea_wm, planeb_wm, planec_wm;
+       int cursora_wm, cursorb_wm, cursorc_wm;
+       int plane_sr, cursor_sr;
+       int ignore_plane_sr, ignore_cursor_sr;
+       unsigned int enabled = 0;
+       bool cxsr_enabled;
+
+       vlv_update_drain_latency(crtc);
+
+       if (g4x_compute_wm0(dev, PIPE_A,
+                           &valleyview_wm_info, latency_ns,
+                           &valleyview_cursor_wm_info, latency_ns,
+                           &planea_wm, &cursora_wm))
+               enabled |= 1 << PIPE_A;
+
+       if (g4x_compute_wm0(dev, PIPE_B,
+                           &valleyview_wm_info, latency_ns,
+                           &valleyview_cursor_wm_info, latency_ns,
+                           &planeb_wm, &cursorb_wm))
+               enabled |= 1 << PIPE_B;
+
+       if (g4x_compute_wm0(dev, PIPE_C,
+                           &valleyview_wm_info, latency_ns,
+                           &valleyview_cursor_wm_info, latency_ns,
+                           &planec_wm, &cursorc_wm))
+               enabled |= 1 << PIPE_C;
+
+       if (single_plane_enabled(enabled) &&
+           g4x_compute_srwm(dev, ffs(enabled) - 1,
+                            sr_latency_ns,
+                            &valleyview_wm_info,
+                            &valleyview_cursor_wm_info,
+                            &plane_sr, &ignore_cursor_sr) &&
+           g4x_compute_srwm(dev, ffs(enabled) - 1,
+                            2*sr_latency_ns,
+                            &valleyview_wm_info,
+                            &valleyview_cursor_wm_info,
+                            &ignore_plane_sr, &cursor_sr)) {
+               cxsr_enabled = true;
+       } else {
+               cxsr_enabled = false;
+               intel_set_memory_cxsr(dev_priv, false);
+               plane_sr = cursor_sr = 0;
+       }
+
+       DRM_DEBUG_KMS("Setting FIFO watermarks - A: plane=%d, cursor=%d, "
+                     "B: plane=%d, cursor=%d, C: plane=%d, cursor=%d, "
+                     "SR: plane=%d, cursor=%d\n",
+                     planea_wm, cursora_wm,
+                     planeb_wm, cursorb_wm,
+                     planec_wm, cursorc_wm,
+                     plane_sr, cursor_sr);
+
+       I915_WRITE(DSPFW1,
+                  (plane_sr << DSPFW_SR_SHIFT) |
+                  (cursorb_wm << DSPFW_CURSORB_SHIFT) |
+                  (planeb_wm << DSPFW_PLANEB_SHIFT) |
+                  (planea_wm << DSPFW_PLANEA_SHIFT));
+       I915_WRITE(DSPFW2,
+                  (I915_READ(DSPFW2) & ~DSPFW_CURSORA_MASK) |
+                  (cursora_wm << DSPFW_CURSORA_SHIFT));
+       I915_WRITE(DSPFW3,
+                  (I915_READ(DSPFW3) & ~DSPFW_CURSOR_SR_MASK) |
+                  (cursor_sr << DSPFW_CURSOR_SR_SHIFT));
+       I915_WRITE(DSPFW9_CHV,
+                  (I915_READ(DSPFW9_CHV) & ~(DSPFW_PLANEC_MASK |
+                                             DSPFW_CURSORC_MASK)) |
+                  (planec_wm << DSPFW_PLANEC_SHIFT) |
+                  (cursorc_wm << DSPFW_CURSORC_SHIFT));
+
+       if (cxsr_enabled)
+               intel_set_memory_cxsr(dev_priv, true);
+}
+
 static void g4x_update_wm(struct drm_crtc *crtc)
 {
        struct drm_device *dev = crtc->dev;
@@ -7119,7 +7198,7 @@ void intel_init_pm(struct drm_device *dev)
                else if (INTEL_INFO(dev)->gen == 8)
                        dev_priv->display.init_clock_gating = gen8_init_clock_gating;
        } else if (IS_CHERRYVIEW(dev)) {
-               dev_priv->display.update_wm = valleyview_update_wm;
+               dev_priv->display.update_wm = cherryview_update_wm;
                dev_priv->display.init_clock_gating =
                        cherryview_init_clock_gating;
        } else if (IS_VALLEYVIEW(dev)) {