drm_dp_find_vcpi_slots() returns an error when there is not enough
available bandwidth on a link to support a mode. This error should make
compute_config() to fail. Not returning false could end up in a modeset
which will not work.
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp_mst.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index e21cf08..4280a83 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -63,6 +63,10 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
pipe_config->pbn = mst_pbn;
slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
+ if (slots < 0) {
+ DRM_ERROR("not enough available time slots for pbn=%d", mst_pbn);
+ return false;
+ }
intel_link_compute_m_n(bpp, lane_count,
adjusted_mode->crtc_clock,
--
2.7.4
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