Commit 7d6287a8 authored by Imre Deak's avatar Imre Deak
Browse files

drm/i915: Check for unsupported DP link rates during initial commit 



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@linux.intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarImre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201003001846.1271151-4-imre.deak@intel.com
parent b671d6ef

drivers/gpu/drm/i915/display/intel_dp.c

+12 −0
Original line number Diff line number Diff line
@@ -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.