Some BIOSes set an unsupported/imprecise DP link rate (for instance on
TGL A stepping). Make sure that we do an encoder recompute and a modeset
in this case.
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index d33a3d9fdc3a..df5277c2b9ba 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -3707,6 +3707,18 @@ bool intel_dp_initial_fastset_check(struct intel_encoder *encoder,
struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+ struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
+ /*
+ * If BIOS has set an unsupported or non-standard link rate for some
+ * reason force an encoder recompute and full modeset.
+ */
+ if (intel_dp_rate_index(intel_dp->source_rates, intel_dp->num_source_rates,
+ crtc_state->port_clock) < 0) {
+ drm_dbg_kms(&i915->drm, "Forcing full modeset due to unsupported link rate\n");
+ crtc_state->uapi.connectors_changed = true;
+ return false;
+ }
/*
* FIXME hack to force full modeset when DSC is being used.
--
2.25.1
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