On Thu, 2016-09-29 at 15:39 -0300, Paulo Zanoni wrote:
> 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.
>
> Fixes: 05a76d3d6ad1 ("drm/i915/skl: Ensure pipes with changed wms get
> added to the state")
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97888
> Cc: Lyude <cpaul@xxxxxxxxxx>
> Cc: Mike Lothian <mike@xxxxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Reported-and-bisected-by: Mike Lothian <mike@xxxxxxxxxxxxxx>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_pm.c | 41
> ++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 40 insertions(+), 1 deletion(-)
>
>
> I can confirm this fixes the flickering I was seeing.
>
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c
> b/drivers/gpu/drm/i915/intel_pm.c
> index 5d39ad2..1cf34a3 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3966,6 +3966,45 @@ 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 (cur_ddb->plane[pipe][id].start ==
> + new_ddb->plane[pipe][id].start &&
> + cur_ddb->plane[pipe][id].end ==
> + new_ddb->plane[pipe][id].end &&
> + cur_ddb->y_plane[pipe][id].start ==
> + new_ddb->y_plane[pipe][id].start &&
> + cur_ddb->y_plane[pipe][id].end ==
> + new_ddb->y_plane[pipe][id].end)
> + continue;
Just use skl_ddb_entry_equals() here.
With that fixed:
Reviewed-by: Lyude <cpaul@xxxxxxxxxx>
> +
> + 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 +4069,7 @@ 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;
> }
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