drm/msm/dpu: drop dpu_encoder_phys_ops::atomic_check()

Writeback was the last user of dpu_encoder_phys_ops's atomic_check()
callback. As the code was moved to the dpu_writeback.c, the callback
becomes unused. Drop it now.
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/577528/
Link: https://lore.kernel.org/r/20240208-fd_remove_phys_ops_atomic_mode_set-v4-5-caf5dcd125c0@linaro.org

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

@@ -591,7 +591,6 @@ static int dpu_encoder_virt_atomic_check(
 	struct dpu_global_state *global_state;
 	struct drm_framebuffer *fb;
 	struct drm_dsc_config *dsc;
-	int i = 0;
 	int ret = 0;
 
 	if (!drm_enc || !crtc_state || !conn_state) {
@@ -612,20 +611,6 @@ static int dpu_encoder_virt_atomic_check(
 
 	trace_dpu_enc_atomic_check(DRMID(drm_enc));
 
-	/* perform atomic check on the first physical encoder (master) */
-	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
-		struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
-
-		if (phys->ops.atomic_check)
-			ret = phys->ops.atomic_check(phys, crtc_state,
-					conn_state);
-		if (ret) {
-			DPU_ERROR_ENC(dpu_enc,
-					"mode unsupported, phys idx %d\n", i);
-			return ret;
-		}
-	}
-
 	dsc = dpu_encoder_get_dsc_config(drm_enc);
 
 	topology = dpu_encoder_get_topology(dpu_enc, dpu_kms, adj_mode, crtc_state, dsc);

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

@@ -71,7 +71,6 @@ struct dpu_encoder_phys;
  *				on split_role and current mode (CMD/VID).
  * @enable:			DRM Call. Enable a DRM mode.
  * @disable:			DRM Call. Disable mode.
- * @atomic_check:		DRM Call. Atomic check new DRM state.
  * @control_vblank_irq		Register/Deregister for VBLANK IRQ
  * @wait_for_commit_done:	Wait for hardware to have flushed the
  *				current pending frames to hardware
@@ -96,9 +95,6 @@ struct dpu_encoder_phys_ops {
 	bool (*is_master)(struct dpu_encoder_phys *encoder);
 	void (*enable)(struct dpu_encoder_phys *encoder);
 	void (*disable)(struct dpu_encoder_phys *encoder);
-	int (*atomic_check)(struct dpu_encoder_phys *encoder,
-			    struct drm_crtc_state *crtc_state,
-			    struct drm_connector_state *conn_state);
 	int (*control_vblank_irq)(struct dpu_encoder_phys *enc, bool enable);
 	int (*wait_for_commit_done)(struct dpu_encoder_phys *phys_enc);
 	int (*wait_for_tx_complete)(struct dpu_encoder_phys *phys_enc);