drm/msm/dpu: Remove empty prepare_commit() function

Now that the TE setup has been moved to prepare_for_kickoff(),  we have
not prepare_commit() callbacks left. This makes dpu_encoder_prepare_commit()
do nothing. Remove prepare_commit() from DPU driver.

Changes in V3:
- Reworded commit message to be more clear
- Corrected spelling mistake in commit message

Changes in V4:
- Reworded commit message for clarity
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Patchwork: https://patchwork.freedesktop.org/patch/523606/
Link: https://lore.kernel.org/r/20230221184256.1436-4-quic_jesszhan@quicinc.com
[DB: fixed merge conflict]
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

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

@@ -2094,25 +2094,6 @@ void dpu_encoder_helper_phys_cleanup(struct dpu_encoder_phys *phys_enc)
 	ctl->ops.clear_pending_flush(ctl);
 }
 
-void dpu_encoder_prepare_commit(struct drm_encoder *drm_enc)
-{
-	struct dpu_encoder_virt *dpu_enc;
-	struct dpu_encoder_phys *phys;
-	int i;
-
-	if (!drm_enc) {
-		DPU_ERROR("invalid encoder\n");
-		return;
-	}
-	dpu_enc = to_dpu_encoder_virt(drm_enc);
-
-	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
-		phys = dpu_enc->phys_encs[i];
-		if (phys->ops.prepare_commit)
-			phys->ops.prepare_commit(phys);
-	}
-}
-
 #ifdef CONFIG_DEBUG_FS
 static int _dpu_encoder_status_show(struct seq_file *s, void *data)
 {

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

@@ -146,13 +146,6 @@ struct drm_encoder *dpu_encoder_init(
 int dpu_encoder_setup(struct drm_device *dev, struct drm_encoder *enc,
 		struct msm_display_info *disp_info);
 
-/**
- * dpu_encoder_prepare_commit - prepare encoder at the very beginning of an
- *	atomic commit, before any registers are written
- * @drm_enc:    Pointer to previously created drm encoder structure
- */
-void dpu_encoder_prepare_commit(struct drm_encoder *drm_enc);
-
 /**
  * dpu_encoder_set_idle_timeout - set the idle timeout for video
  *                    and command mode encoders.

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

@@ -411,26 +411,6 @@ static void dpu_kms_disable_commit(struct msm_kms *kms)
 	pm_runtime_put_sync(&dpu_kms->pdev->dev);
 }
 
-static void dpu_kms_prepare_commit(struct msm_kms *kms,
-		struct drm_atomic_state *state)
-{
-	struct drm_crtc *crtc;
-	struct drm_crtc_state *crtc_state;
-	struct drm_encoder *encoder;
-	int i;
-
-	if (!kms)
-		return;
-
-	/* Call prepare_commit for all affected encoders */
-	for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
-		drm_for_each_encoder_mask(encoder, crtc->dev,
-					  crtc_state->encoder_mask) {
-			dpu_encoder_prepare_commit(encoder);
-		}
-	}
-}
-
 static void dpu_kms_flush_commit(struct msm_kms *kms, unsigned crtc_mask)
 {
 	struct dpu_kms *dpu_kms = to_dpu_kms(kms);
@@ -939,7 +919,6 @@ static const struct msm_kms_funcs kms_funcs = {
 	.irq             = dpu_core_irq,
 	.enable_commit   = dpu_kms_enable_commit,
 	.disable_commit  = dpu_kms_disable_commit,
-	.prepare_commit  = dpu_kms_prepare_commit,
 	.flush_commit    = dpu_kms_flush_commit,
 	.wait_flush      = dpu_kms_wait_flush,
 	.complete_commit = dpu_kms_complete_commit,