@@ -59,6 +59,7 @@ static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
&crtc_state->hw.adjusted_mode;
bool constant_n = drm_dp_has_quirk(&intel_dp->desc, DP_DPCD_QUIRK_CONSTANT_N);
int bpp, slots = -EINVAL;
+ int ret = 0;
crtc_state->lane_count = limits->max_lane_count;
crtc_state->port_clock = limits->max_rate;
@@ -78,10 +79,21 @@ static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
crtc_state->lane_count));
if (slots == -EDEADLK)
return slots;
- if (slots >= 0)
- break;
+ if (slots >= 0) {
+ ret = drm_dp_mst_atomic_check(state);
+ /*
+ * If we got slots >= 0 and we can fit those based on check
+ * then we can exit the loop. Otherwise keep trying.
+ */
+ if (!ret)
+ break;
+ }
}
+ /* Despite slots are non-zero, we still failed the atomic check */
+ if (ret && slots >= 0)
+ slots = ret;
+
if (slots < 0) {
drm_dbg_kms(&i915->drm, "failed finding vcpi slots:%d\n",
slots);
We currently always exit that bpp loop because drm_dp_atomic_find_vcpi_slots doesn't care if we actually can fit those or not. I think that wasn't the initial intention here, especially when we keep trying with lower bpps, we are supposed to keep trying until we actually find some _working_ configuration, which isn't the case here. So added that drm_dp_mst_check here, so that we can make sure that try all the bpps before we fail. Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> --- drivers/gpu/drm/i915/display/intel_dp_mst.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-)