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drm/i915/gen9: only add the planes actually affected by ddb changes

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We were previously adding all the planes owned by the CRTC even when
the ddb partitioning didn't change for them. As a consequence, a lot
of functions were being called when we were just moving the cursor
around the screen, such as skylake_update_primary_plane().

This was causing flickering on the primary plane when moving the
cursor. I'm not 100% sure which operation caused the flickering, but
we were writing to a lot of registers, so it could be any of these
writes. With this patch, just moving the mouse won't add the primary
plane to the commit since it won't trigger a change in DDB
partitioning.

v2: Use skl_ddb_entry_equal() (Lyude).
v3: Change Reported-and-bisected-by: to Reported-by: for checkpatch

Fixes: 05a76d3d6a ("drm/i915/skl: Ensure pipes with changed wms get added to the state")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97888
Cc: Mike Lothian <mike@fireburn.co.uk>
Cc: stable@vger.kernel.org
Reported-by: Mike Lothian <mike@fireburn.co.uk>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Lyude <cpaul@redhat.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1475177808-29955-1-git-send-email-paulo.r.zanoni@intel.com
This commit is contained in:
Paulo Zanoni 2016-09-29 16:36:48 -03:00 committed by Lyude
parent be754b101f
commit 7f60e200e2
1 changed files with 36 additions and 1 deletions
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37
drivers/gpu/drm/i915/intel_pm.c
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@ -3966,6 +3966,41 @@ pipes_modified(struct drm_atomic_state *state)
return ret;
}
int
skl_ddb_add_affected_planes(struct intel_crtc_state *cstate)
{
struct drm_atomic_state *state = cstate->base.state;
struct drm_device *dev = state->dev;
struct drm_crtc *crtc = cstate->base.crtc;
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
struct drm_i915_private *dev_priv = to_i915(dev);
struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
struct skl_ddb_allocation *new_ddb = &intel_state->wm_results.ddb;
struct skl_ddb_allocation *cur_ddb = &dev_priv->wm.skl_hw.ddb;
struct drm_plane_state *plane_state;
struct drm_plane *plane;
enum pipe pipe = intel_crtc->pipe;
int id;
WARN_ON(!drm_atomic_get_existing_crtc_state(state, crtc));
drm_for_each_plane_mask(plane, dev, crtc->state->plane_mask) {
id = skl_wm_plane_id(to_intel_plane(plane));
if (skl_ddb_entry_equal(&cur_ddb->plane[pipe][id],
&new_ddb->plane[pipe][id]) &&
skl_ddb_entry_equal(&cur_ddb->y_plane[pipe][id],
&new_ddb->y_plane[pipe][id]))
continue;
plane_state = drm_atomic_get_plane_state(state, plane);
if (IS_ERR(plane_state))
return PTR_ERR(plane_state);
}
return 0;
}
static int
skl_compute_ddb(struct drm_atomic_state *state)
{
@ -4030,7 +4065,7 @@ skl_compute_ddb(struct drm_atomic_state *state)
if (ret)
return ret;
ret = drm_atomic_add_affected_planes(state, &intel_crtc->base);
ret = skl_ddb_add_affected_planes(cstate);
if (ret)
return ret;
}