Reading out the DP encoders' DPCD during booting or resume is only required for enabled encoders: such encoders may be modesetted during the initial commit and the link training this involves depends on an initialized DPCD. For DDI encoders reading out the DPCD is skipped, do the same on pre-DDI platforms.
Cc: José Roberto de Souza <[email protected]> Signed-off-by: Imre Deak <[email protected]> --- drivers/gpu/drm/i915/display/intel_dp.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 9d8132dd4cc5a..23de500d56b52 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -2007,6 +2007,9 @@ void intel_dp_sync_state(struct intel_encoder *encoder, { struct intel_dp *intel_dp = enc_to_intel_dp(encoder); + if (!crtc_state) + return; + /* * Don't clobber DPCD if it's been already read out during output * setup (eDP) or detect. -- 2.27.0
