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drm/i915: Use old mbus_join value when increasing CDCLK

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In order to make sure we are not breaking the proper sequence
let's do updates step by step and don't change MBUS join value
during MDCLK/CDCLK programming stage.
MBUS join programming would be taken care by pre/post ddb hooks.

v2: - Reworded comment about using old mbus_join value in
      intel_set_cdclk(Ville Syrjälä)

Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
[v3: vsyrjala: rebase on top of cdclk changes, reword a bit more]
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240402155016.13733-11-ville.syrjala@linux.intel.com
This commit is contained in:
Stanislav Lisovskiy 2024-04-02 18:50:12 +03:00 committed by Ville Syrjälä
parent d91254e932
commit 48b85304c0
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/i915/display/intel_cdclk.c
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@ -2617,6 +2617,12 @@ intel_set_cdclk_pre_plane_update(struct intel_atomic_state *state)
old_cdclk_state->actual.voltage_level);
}
/*
* mbus joining will be changed later by
* intel_dbuf_mbus_{pre,post}_ddb_update()
*/
cdclk_config.joined_mbus = old_cdclk_state->actual.joined_mbus;
drm_WARN_ON(&i915->drm, !new_cdclk_state->base.changed);
intel_set_cdclk(i915, &cdclk_config, pipe,