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| author | Jani Nikula <jani.nikula@intel.com> | 2020-02-13 17:04:11 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2020-02-15 20:20:02 +0300 |
| commit | a4277aa398d76db109d6b8420934f68daf69a6c3 (patch) | |
| tree | 60e6534dd0d9a2ed3e9cd1f14b90f4bb7f8d897e /drivers/gpu/drm/i915/display | |
| parent | b18e249bf6168d0cea736334187ef08a90dd8b43 (diff) | |
| download | linux-a4277aa398d76db109d6b8420934f68daf69a6c3.tar.xz | |
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: fbacb15ea814 ("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
Diffstat (limited to 'drivers/gpu/drm/i915/display')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_display.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c index 61ba1f2256a0..1e3f2cc27db8 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -17828,6 +17828,24 @@ retry: * have readout for pipe gamma enable. */ crtc_state->uapi.color_mgmt_changed = true; + + /* + * FIXME hack to force full modeset when DSC is being + * used. + * + * As long as we do not have full state readout and + * config comparison of crtc_state->dsc, we have no way + * to ensure reliable fastset. Remove once we have + * readout for DSC. + */ + if (crtc_state->dsc.compression_enable) { + ret = drm_atomic_add_affected_connectors(state, + &crtc->base); + if (ret) + goto out; + crtc_state->uapi.mode_changed = true; + drm_dbg_kms(dev, "Force full modeset for DSC\n"); + } } } |