drm/i915/dsb: Precompute DSB_CHICKEN

Adjust the code that determines the correct DSB_CHICKEN value
to be usable for use within DSB commands themselves. Ie.
precompute it based on our knowledge of what the hardware state
(VRR vs. not mainly) will be at the time of the commit.

Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Animesh Manna <[email protected]>

Author: vsyrjala

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

@@ -43,6 +43,7 @@ struct intel_dsb {
 	 */
 	unsigned int ins_start_offset;
 
+	u32 chicken;
 	int hw_dewake_scanline;
 };
 
@@ -149,9 +150,10 @@ static int dsb_scanline_to_hw(struct intel_atomic_state *state,
 	return (scanline + vtotal - intel_crtc_scanline_offset(crtc_state)) % vtotal;
 }
 
-static u32 dsb_chicken(struct intel_crtc *crtc)
+static u32 dsb_chicken(struct intel_atomic_state *state,
+		       struct intel_crtc *crtc)
 {
-	if (crtc->mode_flags & I915_MODE_FLAG_VRR)
+	if (pre_commit_is_vrr_active(state, crtc))
 		return DSB_SKIP_WAITS_EN |
 			DSB_CTRL_WAIT_SAFE_WINDOW |
 			DSB_CTRL_NO_WAIT_VBLANK |
@@ -447,7 +449,7 @@ static void _intel_dsb_commit(struct intel_dsb *dsb, u32 ctrl,
 			  ctrl | DSB_ENABLE);
 
 	intel_de_write_fw(display, DSB_CHICKEN(pipe, dsb->id),
-			  dsb_chicken(crtc));
+			  dsb->chicken);
 
 	intel_de_write_fw(display, DSB_INTERRUPT(pipe, dsb->id),
 			  dsb_error_int_status(display) | DSB_PROG_INT_STATUS |
@@ -578,6 +580,7 @@ struct intel_dsb *intel_dsb_prepare(struct intel_atomic_state *state,
 	dsb->free_pos = 0;
 	dsb->ins_start_offset = 0;
 
+	dsb->chicken = dsb_chicken(state, crtc);
 	dsb->hw_dewake_scanline =
 		dsb_scanline_to_hw(state, crtc, dsb_dewake_scanline(state, crtc));