Currently we only recalculate CDCLK if active plane mask changes
or if we do a full modeset, however according to BSpec
required Dbuf bandwidth calculations also depend on pipe/plane
scaling ratio, which means that CDCLK must be recalculated
everytime plane scaling ratio changes, because it affects
display buffer bandwidth requirements.
v2: - Removed excessive debugs(Jani Nikula)
- Switched to drm_dbg_kms(Jani Nikula)
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovs...@intel.com>
---
drivers/gpu/drm/i915/display/intel_display.c | 56 ++++++++++++++++++--
1 file changed, 53 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c
b/drivers/gpu/drm/i915/display/intel_display.c
index bf7ce684dd8e..256cf803e6b0 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -7499,13 +7499,57 @@ static int intel_bigjoiner_add_affected_planes(struct
intel_atomic_state *state)
return 0;
}
+static bool scaling_affects_cdclk(struct intel_plane_state *old_plane_state,
+ struct intel_plane_state *new_plane_state)
+{
+ struct drm_i915_private *i915 =
to_i915(new_plane_state->uapi.plane->dev);
+ int old_src_w = drm_rect_width(&old_plane_state->uapi.src) >> 16;
+ int old_src_h = drm_rect_height(&old_plane_state->uapi.src) >> 16;
+ int old_dst_w = drm_rect_width(&old_plane_state->uapi.dst);
+ int old_dst_h = drm_rect_height(&old_plane_state->uapi.dst);
+ int new_src_w = drm_rect_width(&new_plane_state->uapi.src) >> 16;
+ int new_src_h = drm_rect_height(&new_plane_state->uapi.src) >> 16;
+ int new_dst_w = drm_rect_width(&new_plane_state->uapi.dst);
+ int new_dst_h = drm_rect_height(&new_plane_state->uapi.dst);
+ int old_hscale_ratio, new_hscale_ratio;
+ int old_vscale_ratio, new_vscale_ratio;
+
+ if (needs_scaling(old_plane_state) != needs_scaling(new_plane_state))
+ return true;
+
+ if (!old_dst_w || !old_dst_h)
+ return true;
+
+ old_hscale_ratio = DIV_ROUND_UP(old_src_w, old_dst_w);
+ old_vscale_ratio = DIV_ROUND_UP(old_src_h, old_dst_h);
+
+ if (!new_dst_w || !new_dst_h)
+ return true;
+
+ new_hscale_ratio = DIV_ROUND_UP(new_src_w, new_dst_w);
+ new_vscale_ratio = DIV_ROUND_UP(new_src_h, new_dst_h);
+
+ if ((old_hscale_ratio != new_hscale_ratio) ||
+ (old_vscale_ratio != new_vscale_ratio)) {
+ drm_dbg_kms(&i915->drm, "Scaling ratios changed from %dx%d"
+ " to %dx%d - need cdclk recalc\n",
+ old_hscale_ratio, old_vscale_ratio,
+ new_hscale_ratio, new_vscale_ratio);
+ return true;
+ }
+
+ return false;
+}
+
static int intel_atomic_check_planes(struct intel_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
struct intel_crtc_state *old_crtc_state, *new_crtc_state;
struct intel_plane_state *plane_state;
+ struct intel_plane_state *old_plane_state;
struct intel_plane *plane;
struct intel_crtc *crtc;
+ bool need_cdclk_calc = false;
int i, ret;
ret = icl_add_linked_planes(state);
@@ -7516,7 +7560,7 @@ static int intel_atomic_check_planes(struct
intel_atomic_state *state)
if (ret)
return ret;
- for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
+ for_each_oldnew_intel_plane_in_state(state, plane, old_plane_state,
plane_state, i) {
ret = intel_plane_atomic_check(state, plane);
if (ret) {
drm_dbg_atomic(&dev_priv->drm,
@@ -7524,6 +7568,9 @@ static int intel_atomic_check_planes(struct
intel_atomic_state *state)
plane->base.base.id, plane->base.name);
return ret;
}
+
+ if (scaling_affects_cdclk(old_plane_state, plane_state))
+ need_cdclk_calc = true;
}
for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
@@ -7539,18 +7586,21 @@ static int intel_atomic_check_planes(struct
intel_atomic_state *state)
* the planes' minimum cdclk calculation. Add such planes
* to the state before we compute the minimum cdclk.
*/
- if (!active_planes_affects_min_cdclk(dev_priv))
+ if (!active_planes_affects_min_cdclk(dev_priv) &&
!need_cdclk_calc)
continue;
old_active_planes = old_crtc_state->active_planes &
~BIT(PLANE_CURSOR);
new_active_planes = new_crtc_state->active_planes &
~BIT(PLANE_CURSOR);
- if (hweight8(old_active_planes) == hweight8(new_active_planes))
+ if ((hweight8(old_active_planes) ==
hweight8(new_active_planes)) &&
+ !need_cdclk_calc)
continue;
ret = intel_crtc_add_planes_to_state(state, crtc,
new_active_planes);
if (ret)
return ret;
+
+
}
return 0;
--
2.24.1.485.gad05a3d8e5
