Commit 4bbf0d47 authored by Lyude Paul's avatar Lyude Paul Committed by Rodrigo Vivi

drm/i915: Fix intel_dp_mst_best_encoder()

Currently, i915 appears to rely on blocking modesets on
no-longer-present MSTB ports by simply returning NULL for
->best_encoder(), which in turn causes any new atomic commits that don't
disable the CRTC to fail. This is wrong however, since we still want to
allow userspace to disable CRTCs on no-longer-present MSTB ports by
changing the DPMS state to off and this still requires that we retrieve
an encoder.

So, fix this by always returning a valid encoder regardless of the state
of the MST port.

Changes since v1:
- Remove mst atomic helper, since this got replaced with a much simpler
  solution
Signed-off-by: default avatarLyude Paul <lyude@redhat.com>
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Cc: stable@vger.kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20181008232437.5571-6-lyude@redhat.com
(cherry picked from commit a9f9ca33)
Signed-off-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
parent c02ba4ef
......@@ -404,8 +404,6 @@ static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *c
struct intel_dp *intel_dp = intel_connector->mst_port;
struct intel_crtc *crtc = to_intel_crtc(state->crtc);
if (!READ_ONCE(connector->registered))
return NULL;
return &intel_dp->mst_encoders[crtc->pipe]->base.base;
}
......
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