Commit f153478d authored by Imre Deak's avatar Imre Deak

drm/i915/tgl+: Use the correct DP_TP_* register instances in MST encoders

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 <ville.syrjala@linux.intel.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: default avatarImre Deak <imre.deak@intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: default avatarJosé Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200616211146.23027-1-imre.deak@intel.com
parent 8a25c4be
......@@ -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);
......
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