disp: msm: dsi: add support for splitlink sublinks video data swap

Change adds support for enabling splitlink sublinks video data swap.

Change-Id: I731b85a5e8fe8638005433819957dd0658f72963
Signed-off-by: Vara Reddy <varar@codeaurora.org>

msm/dsi/dsi_ctrl.c

@@ -997,7 +997,7 @@ static int dsi_ctrl_update_link_freqs(struct dsi_ctrl *dsi_ctrl,
 	if (host_cfg->data_lanes & DSI_DATA_LANE_3)
 		num_of_lanes++;
 
-	if (split_link->split_link_enabled)
+	if (split_link->enabled)
 		num_of_lanes = split_link->lanes_per_sublink;
 
 	config->common_config.num_data_lanes = num_of_lanes;
@@ -1368,6 +1368,10 @@ static void dsi_kickoff_msg_tx(struct dsi_ctrl *dsi_ctrl,
 		dsi_hw_ops.reset_trig_ctrl(&dsi_ctrl->hw,
 				&dsi_ctrl->host_config.common_config);
 
+	if (dsi_hw_ops.splitlink_cmd_setup && split_link->enabled)
+		dsi_hw_ops.splitlink_cmd_setup(&dsi_ctrl->hw,
+				&dsi_ctrl->host_config.common_config, flags);
+
 	/*
 	 * Always enable DMA scheduling for video mode panel.
 	 *

msm/dsi/dsi_ctrl_hw_cmn.c

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2015-2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015-2021, The Linux Foundation. All rights reserved.
  */
 
 #include <linux/delay.h>
@@ -56,7 +56,7 @@ static void dsi_split_link_setup(struct dsi_ctrl_hw *ctrl,
 {
 	u32 reg;
 
-	if (!cfg->split_link.split_link_enabled)
+	if (!cfg->split_link.enabled)
 		return;
 
 	reg = DSI_R32(ctrl, DSI_SPLIT_LINK);
@@ -69,6 +69,14 @@ static void dsi_split_link_setup(struct dsi_ctrl_hw *ctrl,
 	reg &= ~(0x7 << 20);
 	reg |= DSI_CTRL_MDP0_LINK_SEL;
 
+	/* COMMAND_INPUT_SWAP|VIDEO_INPUT_SWAP */
+	if (cfg->split_link.sublink_swap) {
+		if (cfg->split_link.panel_mode == DSI_OP_CMD_MODE)
+			reg |= BIT(8);
+		else
+			reg |= BIT(4);
+	}
+
 	/* EN */
 	reg |= 0x1;
 

msm/dsi/dsi_defs.h

@@ -443,14 +443,18 @@ struct dsi_mode_info {
 
 /**
  * struct dsi_split_link_config - Split Link Configuration
- * @split_link_enabled:  Split Link Enabled.
+ * @enabled:  Split Link Enabled.
+ * @sublink_swap: Split link left right sublinks swap.
  * @num_sublinks:     Number of sublinks.
  * @lanes_per_sublink:   Number of lanes per sublink.
+ * @panel_mode: Specifies cmd or video mode.
  */
 struct dsi_split_link_config {
-	bool split_link_enabled;
+	bool enabled;
+	bool sublink_swap;
 	u32 num_sublinks;
 	u32 lanes_per_sublink;
+	enum dsi_op_mode panel_mode;
 };
 
 /**

msm/dsi/dsi_display.c

@@ -2055,7 +2055,7 @@ static void adjust_timing_by_ctrl_count(const struct dsi_display *display,
 					struct dsi_display_mode *mode)
 {
 	struct dsi_host_common_cfg *host = &display->panel->host_config;
-	bool is_split_link = host->split_link.split_link_enabled;
+	bool is_split_link = host->split_link.enabled;
 	u32 sublinks_count = host->split_link.num_sublinks;
 
 	if (is_split_link && sublinks_count > 1) {
@@ -5297,16 +5297,9 @@ static int dsi_display_validate_split_link(struct dsi_display *display)
 	struct dsi_display_ctrl *ctrl;
 	struct dsi_host_common_cfg *host = &display->panel->host_config;
 
-	if (!host->split_link.split_link_enabled)
+	if (!host->split_link.enabled)
 		return 0;
 
-	if (display->panel->panel_mode == DSI_OP_CMD_MODE) {
-		DSI_ERR("[%s] split link is not supported in command mode\n",
-			display->name);
-		rc = -ENOTSUPP;
-		goto error;
-	}
-
 	display_for_each_ctrl(i, display) {
 		ctrl = &display->ctrl[i];
 		if (!ctrl->ctrl->split_link_supported) {
@@ -5317,13 +5310,14 @@ static int dsi_display_validate_split_link(struct dsi_display *display)
 		}
 
 		set_bit(DSI_PHY_SPLIT_LINK, ctrl->phy->hw.feature_map);
+		host->split_link.panel_mode = display->panel->panel_mode;
 	}
 
 	DSI_DEBUG("Split link is enabled\n");
 	return 0;
 
 error:
-	host->split_link.split_link_enabled = false;
+	host->split_link.enabled = false;
 	return rc;
 }
 
@@ -6553,7 +6547,7 @@ int dsi_display_get_info(struct drm_connector *connector,
 	info->te_source = display->te_source;
 
 	host = &display->panel->host_config;
-	if (host->split_link.split_link_enabled)
+	if (host->split_link.enabled)
 		info->capabilities |= MSM_DISPLAY_SPLIT_LINK;
 
 	info->dsc_count = display->panel->dsc_count;
@@ -6827,7 +6821,7 @@ int dsi_display_get_modes(struct dsi_display *display,
 				display_mode.timing.mdp_transfer_time_us;
 		}
 
-		is_split_link = host->split_link.split_link_enabled;
+		is_split_link = host->split_link.enabled;
 		sublinks_count = host->split_link.num_sublinks;
 		if (is_split_link && sublinks_count > 1) {
 			display_mode.timing.h_active *= sublinks_count;
@@ -6924,7 +6918,7 @@ int dsi_display_get_panel_vfp(void *dsi_display,
 	}
 
 	host = &display->panel->host_config;
-	if (host->split_link.split_link_enabled)
+	if (host->split_link.enabled)
 		h_active *= host->split_link.num_sublinks;
 	else
 		h_active *= display->ctrl_count;

msm/dsi/dsi_panel.c

@@ -1157,7 +1157,7 @@ static void dsi_panel_parse_split_link_config(struct dsi_host_common_cfg *host,
 
 	if (!supported) {
 		DSI_DEBUG("[%s] Split link is not supported\n", name);
-		split_link->split_link_enabled = false;
+		split_link->enabled = false;
 		return;
 	}
 
@@ -1177,9 +1177,14 @@ static void dsi_panel_parse_split_link_config(struct dsi_host_common_cfg *host,
 		split_link->lanes_per_sublink = val;
 	}
 
+	supported = utils->read_bool(utils->data, "qcom,split-link-sublink-swap");
+
+	if (!supported)
+		split_link->sublink_swap = false;
+
 	DSI_DEBUG("[%s] Split link is supported %d-%d\n", name,
 		split_link->num_sublinks, split_link->lanes_per_sublink);
-	split_link->split_link_enabled = true;
+	split_link->enabled = true;
 }
 
 static int dsi_panel_parse_host_config(struct dsi_panel *panel)