drm/msm/dpu: Enable widebus for DSI INTF

DPU supports a data-bus widen mode for DSI INTF.

Enable this mode for all supported chipsets if widebus is enabled for DSI.
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/553756/
Link: https://lore.kernel.org/r/20230822-add-widebus-support-v4-2-9dc86083d6ea@quicinc.comSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

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

@@ -1196,15 +1196,18 @@ static void dpu_encoder_virt_atomic_enable(struct drm_encoder *drm_enc,
 	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);
 
 	if (disp_info->intf_type == INTF_DP)
-		dpu_enc->wide_bus_en = msm_dp_wide_bus_available(
-				priv->dp[disp_info->h_tile_instance[0]]);
+		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;

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

@@ -72,6 +72,8 @@ static void _dpu_encoder_phys_cmd_update_intf_cfg(
 	if (intf_cfg.dsc != 0)
 		cmd_mode_cfg.data_compress = true;
 
+	cmd_mode_cfg.wide_bus_en = dpu_encoder_is_widebus_enabled(phys_enc->parent);
+
 	if (phys_enc->hw_intf->ops.program_intf_cmd_cfg)
 		phys_enc->hw_intf->ops.program_intf_cmd_cfg(phys_enc->hw_intf, &cmd_mode_cfg);
 }

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

@@ -521,6 +521,9 @@ static void dpu_hw_intf_program_intf_cmd_cfg(struct dpu_hw_intf *ctx,
 	if (cmd_mode_cfg->data_compress)
 		intf_cfg2 |= INTF_CFG2_DCE_DATA_COMPRESS;
 
+	if (cmd_mode_cfg->wide_bus_en)
+		intf_cfg2 |= INTF_CFG2_DATABUS_WIDEN;
+
 	DPU_REG_WRITE(&ctx->hw, INTF_CONFIG2, intf_cfg2);
 }
 
@@ -545,6 +548,10 @@ static void _setup_intf_ops(struct dpu_hw_intf_ops *ops,
 		ops->disable_autorefresh = dpu_hw_intf_disable_autorefresh;
 	}
 
+	/* Technically, INTF_CONFIG2 is present for DPU 5.0+, but
+	 * we can configure it for DPU 7.0+ since the wide bus and DSC flags
+	 * would not be set for DPU < 7.0 anyways
+	 */
 	if (mdss_rev->core_major_ver >= 7)
 		ops->program_intf_cmd_cfg = dpu_hw_intf_program_intf_cmd_cfg;
 }

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

@@ -50,6 +50,7 @@ struct dpu_hw_intf_status {
 
 struct dpu_hw_intf_cmd_mode_cfg {
 	u8 data_compress;	/* enable data compress between dpu and dsi */
+	u8 wide_bus_en;		/* enable databus widen mode */
 };
 
 /**

drivers/gpu/drm/msm/dsi/dsi.c

@@ -17,6 +17,11 @@ struct drm_dsc_config *msm_dsi_get_dsc_config(struct msm_dsi *msm_dsi)
 	return msm_dsi_host_get_dsc_config(msm_dsi->host);
 }
 
+bool msm_dsi_wide_bus_enabled(struct msm_dsi *msm_dsi)
+{
+	return false;
+}
+
 static int dsi_get_phy(struct msm_dsi *msm_dsi)
 {
 	struct platform_device *pdev = msm_dsi->pdev;

drivers/gpu/drm/msm/msm_drv.h

@@ -343,6 +343,7 @@ void msm_dsi_snapshot(struct msm_disp_state *disp_state, struct msm_dsi *msm_dsi
 bool msm_dsi_is_cmd_mode(struct msm_dsi *msm_dsi);
 bool msm_dsi_is_bonded_dsi(struct msm_dsi *msm_dsi);
 bool msm_dsi_is_master_dsi(struct msm_dsi *msm_dsi);
+bool msm_dsi_wide_bus_enabled(struct msm_dsi *msm_dsi);
 struct drm_dsc_config *msm_dsi_get_dsc_config(struct msm_dsi *msm_dsi);
 #else
 static inline void __init msm_dsi_register(void)
@@ -372,6 +373,10 @@ static inline bool msm_dsi_is_master_dsi(struct msm_dsi *msm_dsi)
 {
 	return false;
 }
+static inline bool msm_dsi_wide_bus_enabled(struct msm_dsi *msm_dsi)
+{
+	return false;
+}
 
 static inline struct drm_dsc_config *msm_dsi_get_dsc_config(struct msm_dsi *msm_dsi)
 {