drm/msm/dpu: move widebus logic to its own API

Widebus enablement is decided by the interfaces based on their specific
checks and that already happens with DSI/DP specific helpers. Let's
invoke these helpers from dpu_encoder_is_widebus_enabled() to make it
cleaner overall.

Signed-off-by: Paloma Arellano <quic_parellan@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/579632/
Link: https://lore.kernel.org/r/20240222194025.25329-10-quic_parellan@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Author: Paloma Arellano

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

@@ -221,9 +221,21 @@ static u32 dither_matrix[DITHER_MATRIX_SZ] = {
 
 bool dpu_encoder_is_widebus_enabled(const struct drm_encoder *drm_enc)
 {
-	const struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
+	const struct dpu_encoder_virt *dpu_enc;
+	struct msm_drm_private *priv = drm_enc->dev->dev_private;
+	const struct msm_display_info *disp_info;
+	int index;
+
+	dpu_enc = to_dpu_encoder_virt(drm_enc);
+	disp_info = &dpu_enc->disp_info;
+	index = disp_info->h_tile_instance[0];
+
+	if (disp_info->intf_type == INTF_DP)
+		return msm_dp_wide_bus_available(priv->dp[index]);
+	else if (disp_info->intf_type == INTF_DSI)
+		return msm_dsi_wide_bus_enabled(priv->dsi[index]);
 
-	return dpu_enc->wide_bus_en;
+	return false;
 }
 
 bool dpu_encoder_is_dsc_enabled(const struct drm_encoder *drm_enc)
@@ -1209,26 +1221,17 @@ static void dpu_encoder_virt_atomic_enable(struct drm_encoder *drm_enc,
 	struct dpu_encoder_virt *dpu_enc = NULL;
 	int ret = 0;
 	struct drm_display_mode *cur_mode = NULL;
-	struct msm_drm_private *priv = drm_enc->dev->dev_private;
-	struct msm_display_info *disp_info;
-	int index;
 
 	dpu_enc = to_dpu_encoder_virt(drm_enc);
-	disp_info = &dpu_enc->disp_info;
-	index = disp_info->h_tile_instance[0];
-
 	dpu_enc->dsc = dpu_encoder_get_dsc_config(drm_enc);
 
 	atomic_set(&dpu_enc->frame_done_timeout_cnt, 0);
 
-	if (disp_info->intf_type == INTF_DP)
-		dpu_enc->wide_bus_en = msm_dp_wide_bus_available(priv->dp[index]);
-	else if (disp_info->intf_type == INTF_DSI)
-		dpu_enc->wide_bus_en = msm_dsi_wide_bus_enabled(priv->dsi[index]);
-
 	mutex_lock(&dpu_enc->enc_lock);
 	cur_mode = &dpu_enc->base.crtc->state->adjusted_mode;
 
+	dpu_enc->wide_bus_en = dpu_encoder_is_widebus_enabled(drm_enc);
+
 	trace_dpu_enc_enable(DRMID(drm_enc), cur_mode->hdisplay,
 			     cur_mode->vdisplay);
 

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

@@ -156,6 +156,10 @@ int dpu_encoder_get_linecount(struct drm_encoder *drm_enc);
  */
 int dpu_encoder_get_vsync_count(struct drm_encoder *drm_enc);
 
+/**
+ * dpu_encoder_is_widebus_enabled - return bool value if widebus is enabled
+ * @drm_enc:    Pointer to previously created drm encoder structure
+ */
 bool dpu_encoder_is_widebus_enabled(const struct drm_encoder *drm_enc);
 
 /**