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drm/i915/dsc: force full modeset whenever DSC is enabled at probe
We lack full state readout of DSC config, which may lead to DSC enable
using a config that's all zeros, failing spectacularly. Force full
modeset and thus compute config at probe to get a sane state, until we
implement DSC state readout. Any fastset that did appear to work with
DSC at probe, worked by coincidence. [1] is an example of a change that
triggered the issue on TGL DSI DSC.
[1] http://patchwork.freedesktop.org/patch/msgid/20200212150102.7600-1-ville.syrjala@linux.intel.com
Cc: Manasi Navare <manasi.d.navare@intel.com>
Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: stable@vger.kernel.org
Fixes: fbacb15ea8
("drm/i915/dsc: add basic hardware state readout support")
Acked-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200213140412.32697-3-stanislav.lisovskiy@intel.com
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@ -17828,6 +17828,24 @@ static int intel_initial_commit(struct drm_device *dev)
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* have readout for pipe gamma enable.
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*/
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crtc_state->uapi.color_mgmt_changed = true;
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/*
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* FIXME hack to force full modeset when DSC is being
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* used.
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*
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* As long as we do not have full state readout and
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* config comparison of crtc_state->dsc, we have no way
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* to ensure reliable fastset. Remove once we have
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* readout for DSC.
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*/
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if (crtc_state->dsc.compression_enable) {
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ret = drm_atomic_add_affected_connectors(state,
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&crtc->base);
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if (ret)
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goto out;
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crtc_state->uapi.mode_changed = true;
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drm_dbg_kms(dev, "Force full modeset for DSC\n");
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}
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}
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}
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