drm/i915/dsb: Use intel_color_uses_dsb()

Use intel_color_uses_dsb() instead of open coding it in
intel_vblank_evade_init(). Make the logic around DSB a bit
more isolated from the rest of the code.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240531114101.19994-5-ville.syrjala@linux.intel.comReviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/i915/display/intel_vblank.c

@@ -5,6 +5,7 @@
 
 #include "i915_drv.h"
 #include "i915_reg.h"
+#include "intel_color.h"
 #include "intel_crtc.h"
 #include "intel_de.h"
 #include "intel_display_types.h"
@@ -637,7 +638,8 @@ void intel_vblank_evade_init(const struct intel_crtc_state *old_crtc_state,
 	 * DSB execution waits for the transcoder's undelayed vblank,
 	 * hence we must kick off the commit before that.
 	 */
-	if (new_crtc_state->dsb || new_crtc_state->update_m_n || new_crtc_state->update_lrr)
+	if (intel_color_uses_dsb(new_crtc_state) ||
+	    new_crtc_state->update_m_n || new_crtc_state->update_lrr)
 		evade->min -= adjusted_mode->crtc_vblank_start - adjusted_mode->crtc_vdisplay;
 }