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drm/i915/dsb: Use non-locked register access
Avoid the locking overhead for DSB registers. We don't need the locks and intel_dsb_commit() in particular needs to be called from the vblank evade critical section and thus needs to be fast. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230606191504.18099-3-ville.syrjala@linux.intel.com Reviewed-by: Uma Shankar <uma.shankar@intel.com>
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