MST encoders must use the master MST transcoder's DP_TP_STATUS and DP_TP_CONTROL registers. Atm, during the HW readout of an MST encoder connected to a slave transcoder we reset these register addresses in intel_dp::regs.dp_tp_* to the slave transcoder's DP_TP_* register addresses incorrectly; fix this.
One example where the above overwite happens is the encoder HW state validation after enabling multiple streams; see intel_dp_mst_enc_get_config(). After that during disabling any stream we'll get a 'Timed out waiting for ACT sent when disabling' error, due to reading from the incorrect DP_TP_STATUS register. This change replaces https://patchwork.freedesktop.org/patch/369577/?series=78193&rev=1 which just papered over the problem. v2: - Correct the failure scenario in the commit log. (José) Cc: Ville Syrjälä <[email protected]> Cc: José Roberto de Souza <[email protected]> Signed-off-by: Imre Deak <[email protected]> Reviewed-by: Ville Syrjälä <[email protected]> --- drivers/gpu/drm/i915/display/intel_ddi.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c index ca7bb2294d2b..73d6cc29291a 100644 --- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -4193,11 +4193,6 @@ void intel_ddi_get_config(struct intel_encoder *encoder, if (drm_WARN_ON(&dev_priv->drm, transcoder_is_dsi(cpu_transcoder))) return; - if (INTEL_GEN(dev_priv) >= 12) { - intel_dp->regs.dp_tp_ctl = TGL_DP_TP_CTL(cpu_transcoder); - intel_dp->regs.dp_tp_status = TGL_DP_TP_STATUS(cpu_transcoder); - } - intel_dsc_get_config(encoder, pipe_config); temp = intel_de_read(dev_priv, TRANS_DDI_FUNC_CTL(cpu_transcoder)); @@ -4299,6 +4294,16 @@ void intel_ddi_get_config(struct intel_encoder *encoder, break; } + if (INTEL_GEN(dev_priv) >= 12) { + enum transcoder transcoder = + intel_dp_mst_is_slave_trans(pipe_config) ? + pipe_config->mst_master_transcoder : + pipe_config->cpu_transcoder; + + intel_dp->regs.dp_tp_ctl = TGL_DP_TP_CTL(transcoder); + intel_dp->regs.dp_tp_status = TGL_DP_TP_STATUS(transcoder); + } + pipe_config->has_audio = intel_ddi_is_audio_enabled(dev_priv, cpu_transcoder); -- 2.23.1 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
