drm/msm/dpu: use PINGPONG_NONE to unbind WB from PP

Currently the driver passes the PINGPONG index to
dpu_hw_wb_ops::bind_pingpong_blk() callback and uses separate boolean
flag to tell whether WB should be bound or unbound. Simplify this by
passing PINGPONG_NONE in case of unbinding and drop the flag completely.
Suggested-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Patchwork: https://patchwork.freedesktop.org/patch/540969/
Link: https://lore.kernel.org/r/20230604031308.894274-2-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

@@ -2080,8 +2080,7 @@ void dpu_encoder_helper_phys_cleanup(struct dpu_encoder_phys *phys_enc)
 	if (phys_enc->hw_wb) {
 		/* disable the PP block */
 		if (phys_enc->hw_wb->ops.bind_pingpong_blk)
-			phys_enc->hw_wb->ops.bind_pingpong_blk(phys_enc->hw_wb, false,
-					phys_enc->hw_pp->idx);
+			phys_enc->hw_wb->ops.bind_pingpong_blk(phys_enc->hw_wb, PINGPONG_NONE);
 
 		/* mark WB flush as pending */
 		if (phys_enc->hw_ctl->ops.update_pending_flush_wb)

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c

@@ -210,7 +210,7 @@ static void dpu_encoder_phys_wb_setup_cdp(struct dpu_encoder_phys *phys_enc)
 
 		/* setup which pp blk will connect to this wb */
 		if (hw_pp && phys_enc->hw_wb->ops.bind_pingpong_blk)
-			phys_enc->hw_wb->ops.bind_pingpong_blk(phys_enc->hw_wb, true,
+			phys_enc->hw_wb->ops.bind_pingpong_blk(phys_enc->hw_wb,
 					phys_enc->hw_pp->idx);
 
 		phys_enc->hw_ctl->ops.setup_intf_cfg(phys_enc->hw_ctl, &intf_cfg);

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.c

@@ -154,7 +154,7 @@ static void dpu_hw_wb_setup_cdp(struct dpu_hw_wb *ctx,
 
 static void dpu_hw_wb_bind_pingpong_blk(
 		struct dpu_hw_wb *ctx,
-		bool enable, const enum dpu_pingpong pp)
+		const enum dpu_pingpong pp)
 {
 	struct dpu_hw_blk_reg_map *c;
 	int mux_cfg;
@@ -167,7 +167,7 @@ static void dpu_hw_wb_bind_pingpong_blk(
 	mux_cfg = DPU_REG_READ(c, WB_MUX);
 	mux_cfg &= ~0xf;
 
-	if (enable)
+	if (pp)
 		mux_cfg |= (pp - PINGPONG_0) & 0x7;
 	else
 		mux_cfg |= 0xf;

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.h

@@ -49,7 +49,7 @@ struct dpu_hw_wb_ops {
 			  bool enable);
 
 	void (*bind_pingpong_blk)(struct dpu_hw_wb *ctx,
-			bool enable, const enum dpu_pingpong pp);
+				  const enum dpu_pingpong pp);
 };
 
 /**