[Intel-gfx] [PATCH 08/18] drm/i915: Skip useless watermark/FIFO related work on VLV/CHV when not needed
ville.syrjala at linux.intel.com
ville.syrjala at linux.intel.com
Thu Feb 16 18:07:41 UTC 2017
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
Check whether anything relevant has actually change when we compute new
watermarks for each plane in the state. If the watermarks for no
primary/sprite planes changed we don't have to recompute the FIFO split
or reprogram the DSBARB registers. And even the cursor watermarks didn't
change we can skip the merge+invert step between all the planes on
the pipe as well.
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
drivers/gpu/drm/i915/intel_atomic.c | 1 +
drivers/gpu/drm/i915/intel_drv.h | 1 +
drivers/gpu/drm/i915/intel_pm.c | 73 +++++++++++++++++++++++++++++--------
3 files changed, 60 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
index aa9160e7f1d8..c5d62aa24d4c 100644
--- a/drivers/gpu/drm/i915/intel_atomic.c
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -99,6 +99,7 @@ intel_crtc_duplicate_state(struct drm_crtc *crtc)
crtc_state->update_wm_pre = false;
crtc_state->update_wm_post = false;
crtc_state->fb_changed = false;
+ crtc_state->fifo_changed = false;
crtc_state->wm.need_postvbl_update = false;
crtc_state->fb_bits = 0;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 9db2548ccf6c..d7b9ddf22b3e 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -568,6 +568,7 @@ struct intel_crtc_state {
bool disable_cxsr;
bool update_wm_pre, update_wm_post; /* watermarks are updated */
bool fb_changed; /* fb on any of the planes is changed */
+ bool fifo_changed; /* FIFO split is changed */
/* Pipe source size (ie. panel fitter input size)
* All planes will be positioned inside this space,
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index cb40e5826a71..6ecad9f949c7 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -1115,31 +1115,36 @@ static u16 vlv_invert_wm_value(u16 wm, u16 fifo_size)
}
/* starting from 'level' set all higher levels to 'value' */
-static void vlv_plane_wm_set(struct intel_crtc_state *crtc_state,
+static bool vlv_plane_wm_set(struct intel_crtc_state *crtc_state,
int level, enum plane_id plane_id, u16 value)
{
struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
int num_levels = vlv_num_wm_levels(dev_priv);
+ bool dirty = false;
for (; level < num_levels; level++) {
struct vlv_pipe_wm *noninverted =
&crtc_state->wm.vlv.noninverted[level];
+ dirty |= noninverted->plane[plane_id] != value;
noninverted->plane[plane_id] = value;
}
+
+ return dirty;
}
-static void vlv_plane_wm_compute(struct intel_crtc_state *crtc_state,
+static bool vlv_plane_wm_compute(struct intel_crtc_state *crtc_state,
const struct intel_plane_state *plane_state)
{
struct intel_plane *plane = to_intel_plane(plane_state->base.plane);
enum plane_id plane_id = plane->id;
int num_levels = vlv_num_wm_levels(to_i915(plane->base.dev));
int level;
+ bool dirty = false;
if (!plane_state->base.visible) {
- vlv_plane_wm_set(crtc_state, 0, plane_id, 0);
- return;
+ dirty |= vlv_plane_wm_set(crtc_state, 0, plane_id, 0);
+ goto out;
}
for (level = 0; level < num_levels; level++) {
@@ -1155,17 +1160,22 @@ static void vlv_plane_wm_compute(struct intel_crtc_state *crtc_state,
if (wm > max_wm)
break;
+ dirty |= noninverted->plane[plane_id] != wm;
noninverted->plane[plane_id] = wm;
}
/* mark all higher levels as invalid */
- vlv_plane_wm_set(crtc_state, level, plane_id, USHRT_MAX);
+ dirty |= vlv_plane_wm_set(crtc_state, level, plane_id, USHRT_MAX);
- DRM_DEBUG_KMS("%s wms: [0]=%d,[1]=%d,[2]=%d\n",
- plane->base.name,
- crtc_state->wm.vlv.noninverted[VLV_WM_LEVEL_PM2].plane[plane_id],
- crtc_state->wm.vlv.noninverted[VLV_WM_LEVEL_PM5].plane[plane_id],
- crtc_state->wm.vlv.noninverted[VLV_WM_LEVEL_DDR_DVFS].plane[plane_id]);
+out:
+ if (dirty)
+ DRM_DEBUG_KMS("%s wms: [0]=%d,[1]=%d,[2]=%d\n",
+ plane->base.name,
+ crtc_state->wm.vlv.noninverted[VLV_WM_LEVEL_PM2].plane[plane_id],
+ crtc_state->wm.vlv.noninverted[VLV_WM_LEVEL_PM5].plane[plane_id],
+ crtc_state->wm.vlv.noninverted[VLV_WM_LEVEL_DDR_DVFS].plane[plane_id]);
+
+ return dirty;
}
static bool vlv_plane_wm_is_valid(const struct intel_crtc_state *crtc_state,
@@ -1198,10 +1208,12 @@ static int vlv_compute_pipe_wm(struct intel_crtc_state *crtc_state)
&crtc_state->wm.vlv.fifo_state;
int num_active_planes = hweight32(crtc_state->active_planes &
~BIT(PLANE_CURSOR));
+ bool needs_modeset = drm_atomic_crtc_needs_modeset(&crtc_state->base);
struct intel_plane_state *plane_state;
struct intel_plane *plane;
enum plane_id plane_id;
int level, ret, i;
+ unsigned int dirty = 0;
for_each_intel_plane_in_state(state, plane, plane_state, i) {
const struct intel_plane_state *old_plane_state =
@@ -1211,7 +1223,37 @@ static int vlv_compute_pipe_wm(struct intel_crtc_state *crtc_state)
old_plane_state->base.crtc != &crtc->base)
continue;
- vlv_plane_wm_compute(crtc_state, plane_state);
+ if (vlv_plane_wm_compute(crtc_state, plane_state))
+ dirty |= BIT(plane->id);
+ }
+
+ /*
+ * DSPARB registers may have been reset due to the
+ * power well being turned off. Make sure we restore
+ * them to a consistent state even if no primary/sprite
+ * planes are initially active.
+ */
+ if (needs_modeset)
+ crtc_state->fifo_changed = true;
+
+ if (!dirty)
+ return 0;
+
+ /* cursor changes don't warrant a FIFO recompute */
+ if (dirty & ~BIT(PLANE_CURSOR)) {
+ const struct intel_crtc_state *old_crtc_state =
+ to_intel_crtc_state(crtc->base.state);
+ const struct vlv_fifo_state *old_fifo_state =
+ &old_crtc_state->wm.vlv.fifo_state;
+
+ ret = vlv_compute_fifo(crtc_state);
+ if (ret)
+ return ret;
+
+ if (needs_modeset ||
+ memcmp(old_fifo_state, fifo_state,
+ sizeof(*fifo_state)) != 0)
+ crtc_state->fifo_changed = true;
}
/* initially allow all levels */
@@ -1224,10 +1266,6 @@ static int vlv_compute_pipe_wm(struct intel_crtc_state *crtc_state)
wm_state->cxsr = crtc->pipe != PIPE_C &&
crtc->wm.cxsr_allowed && num_active_planes == 1;
- ret = vlv_compute_fifo(crtc_state);
- if (ret)
- return ret;
-
for (level = 0; level < wm_state->num_levels; level++) {
const struct vlv_pipe_wm *noninverted =
&crtc_state->wm.vlv.noninverted[level];
@@ -1277,6 +1315,9 @@ static void vlv_atomic_update_fifo(struct intel_atomic_state *state,
&crtc_state->wm.vlv.fifo_state;
int sprite0_start, sprite1_start, fifo_size;
+ if (!crtc_state->fifo_changed)
+ return;
+
sprite0_start = fifo_state->plane[PLANE_PRIMARY];
sprite1_start = fifo_state->plane[PLANE_SPRITE0] + sprite0_start;
fifo_size = fifo_state->plane[PLANE_SPRITE1] + sprite1_start;
@@ -4616,6 +4657,8 @@ void vlv_wm_get_hw_state(struct drm_device *dev)
active->num_levels = wm->level + 1;
active->cxsr = wm->cxsr;
+ vlv_get_fifo_size(crtc_state);
+
/* FIXME sanitize things more */
for (level = 0; level < active->num_levels; level++) {
struct vlv_pipe_wm *noninverted =
--
2.10.2
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