On Fri, 2021-10-15 at 15:10 +0300, Imre Deak wrote:
> 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.
Missing fixes tag
>
> Cc: José Roberto de Souza <jose.souza@xxxxxxxxx>
> Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> ---
> 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;
crtc_state is not used
> +
> /*
> * Don't clobber DPCD if it's been already read out during output
> * setup (eDP) or detect.
