From: Ville Syrjälä <ville.syrj...@linux.intel.com>
Since the watermark registers arent double buffered on VLV/CHV, we'll
need to play around with intermediate watermarks same was as we do on
ILK-BDW.
The watermark registers on VLV/CHV contain inverted values, so to find
the intermediate watermark value we just take the minimum of the
active and optimal values. This also means that, unlike ILK-BDW,
there's no chance that we'd fail to find a working intermediate
watermarks. As long as both the active and optimal watermarks are valid
the intermediate watermarks will come out valid as well.
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
drivers/gpu/drm/i915/intel_drv.h | 3 +-
drivers/gpu/drm/i915/intel_pm.c | 59 +++++++++++++++++++++++++++++++++++++++-
2 files changed, 60 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a92857864ee8..f66b3ce89ec4 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -527,7 +527,8 @@ struct intel_crtc_wm_state {
/* non-inverted optimal watermarks */
struct vlv_pipe_wm noninverted[NUM_VLV_WM_LEVELS];
struct vlv_fifo_state fifo_state;
- /* inverted optimal watermarks */
+ /* inverted intermediate and optimal watermarks */
+ struct vlv_wm_state intermediate;
struct vlv_wm_state optimal;
} vlv;
};
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index c7cc62cf51f6..c4f395370e9d 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -1379,6 +1379,45 @@ static void vlv_atomic_update_fifo(struct
intel_atomic_state *state,
#undef VLV_FIFO
+static int vlv_compute_intermediate_wm(struct drm_device *dev,
+ struct intel_crtc *crtc,
+ struct intel_crtc_state *crtc_state)
+{
+ struct vlv_wm_state *intermediate = &crtc_state->wm.vlv.intermediate;
+ const struct vlv_wm_state *optimal = &crtc_state->wm.vlv.optimal;
+ const struct vlv_wm_state *active = &crtc->wm.active.vlv;
+ int level;
+
+ intermediate->num_levels = min(optimal->num_levels, active->num_levels);
+ intermediate->cxsr = optimal->cxsr & active->cxsr;
+
+ for (level = 0; level < intermediate->num_levels; level++) {
+ enum plane_id plane_id;
+
+ for_each_plane_id_on_crtc(crtc, plane_id) {
+ intermediate->wm[level].plane[plane_id] =
+ min(optimal->wm[level].plane[plane_id],
+ active->wm[level].plane[plane_id]);
+ }
+
+ intermediate->sr[level].plane = min(optimal->sr[level].plane,
+ active->sr[level].plane);
+ intermediate->sr[level].cursor = min(optimal->sr[level].cursor,
+ active->sr[level].cursor);
+ }
+
+ vlv_invalidate_wms(crtc, intermediate, level);
+
+ /*
+ * If our intermediate WM are identical to the final WM, then we can
+ * omit the post-vblank programming; only update if it's different.
+ */
+ if (memcmp(intermediate, optimal, sizeof(*intermediate)) == 0)
+ crtc_state->wm.need_postvbl_update = false;
+
+ return 0;
+}
+
static void vlv_merge_wm(struct drm_i915_private *dev_priv,
struct vlv_wm_values *wm)
{
@@ -1472,7 +1511,22 @@ static void vlv_initial_watermarks(struct
intel_atomic_state *state,
struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
mutex_lock(&dev_priv->wm.wm_mutex);
- crtc->wm.active.vlv = crtc_state->wm.vlv.optimal;
+ crtc->wm.active.vlv = crtc_state->wm.vlv.intermediate;
+ vlv_program_watermarks(dev_priv);
+ mutex_unlock(&dev_priv->wm.wm_mutex);
+}
+
+static void vlv_optimize_watermarks(struct intel_atomic_state *state,
+ struct intel_crtc_state *crtc_state)
+{
+ struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
+ struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
+
+ if (!crtc_state->wm.need_postvbl_update)
+ return;
+
+ mutex_lock(&dev_priv->wm.wm_mutex);
+ intel_crtc->wm.active.vlv = crtc_state->wm.vlv.optimal;
vlv_program_watermarks(dev_priv);
mutex_unlock(&dev_priv->wm.wm_mutex);
}
@@ -4696,6 +4750,7 @@ void vlv_wm_get_hw_state(struct drm_device *dev)
vlv_invalidate_wms(crtc, active, level);
crtc_state->wm.vlv.optimal = *active;
+ crtc_state->wm.vlv.intermediate = *active;
DRM_DEBUG_KMS("Initial watermarks: pipe %c, plane=%d,
cursor=%d, sprite0=%d, sprite1=%d\n",
pipe_name(pipe),
@@ -7832,7 +7887,9 @@ void intel_init_pm(struct drm_i915_private *dev_priv)
} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
vlv_setup_wm_latency(dev_priv);
dev_priv->display.compute_pipe_wm = vlv_compute_pipe_wm;
+ dev_priv->display.compute_intermediate_wm =
vlv_compute_intermediate_wm;
dev_priv->display.initial_watermarks = vlv_initial_watermarks;
+ dev_priv->display.optimize_watermarks = vlv_optimize_watermarks;
dev_priv->display.atomic_update_watermarks =
vlv_atomic_update_fifo;
} else if (IS_PINEVIEW(dev_priv)) {
if (!intel_get_cxsr_latency(IS_PINEVIEW_G(dev_priv),
--
2.7.4
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