drm/msm/dpu: drop dpu_encoder_phys_ops::destroy

Drop the dpu_encoder_phys_ops' destroy() callback. No phys backend
implements it anymore, so it is useless.
Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/570058/
Link: https://lore.kernel.org/r/20231201211845.1026967-13-dmitry.baryshkov@linaro.org

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

@@ -455,24 +455,6 @@ static void dpu_encoder_destroy(struct drm_encoder *drm_enc)
 	dpu_enc = to_dpu_encoder_virt(drm_enc);
 	DPU_DEBUG_ENC(dpu_enc, "\n");
 
-	mutex_lock(&dpu_enc->enc_lock);
-
-	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
-		struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
-
-		if (phys->ops.destroy) {
-			phys->ops.destroy(phys);
-			--dpu_enc->num_phys_encs;
-			dpu_enc->phys_encs[i] = NULL;
-		}
-	}
-
-	if (dpu_enc->num_phys_encs)
-		DPU_ERROR_ENC(dpu_enc, "expected 0 num_phys_encs not %d\n",
-				dpu_enc->num_phys_encs);
-	dpu_enc->num_phys_encs = 0;
-	mutex_unlock(&dpu_enc->enc_lock);
-
 	drm_encoder_cleanup(drm_enc);
 	mutex_destroy(&dpu_enc->enc_lock);
 }

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

@@ -72,7 +72,6 @@ struct dpu_encoder_phys;
  * @enable:			DRM Call. Enable a DRM mode.
  * @disable:			DRM Call. Disable mode.
  * @atomic_check:		DRM Call. Atomic check new DRM state.
- * @destroy:			DRM Call. Destroy and release resources.
  * @control_vblank_irq		Register/Deregister for VBLANK IRQ
  * @wait_for_commit_done:	Wait for hardware to have flushed the
  *				current pending frames to hardware
@@ -102,7 +101,6 @@ struct dpu_encoder_phys_ops {
 	int (*atomic_check)(struct dpu_encoder_phys *encoder,
 			    struct drm_crtc_state *crtc_state,
 			    struct drm_connector_state *conn_state);
-	void (*destroy)(struct dpu_encoder_phys *encoder);
 	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);