Merge "msm: mdss: add split link panel support in mdss"

10 files changed, 368 insertions, 70 deletions

diff --git a/drivers/video/fbdev/msm/mdss_dsi_host.c b/drivers/video/fbdev/msm/mdss_dsi_host.c
index 9f4b7eb52492..c3b7bda9dc0e 100644
--- a/drivers/video/fbdev/msm/mdss_dsi_host.c
+++ b/drivers/video/fbdev/msm/mdss_dsi_host.c
@@ -1311,6 +1311,31 @@ void mdss_dsi_set_burst_mode(struct mdss_dsi_ctrl_pdata *ctrl)
 
 }
 
+static void mdss_dsi_split_link_setup(struct mdss_dsi_ctrl_pdata *ctrl_pdata)
+{
+	u32 data = 0;
+	struct mdss_panel_info *pinfo;
+
+	if (!ctrl_pdata)
+		return;
+
+	pinfo = &ctrl_pdata->panel_data.panel_info;
+	if (!pinfo->split_link_enabled)
+		return;
+
+	pr_debug("%s: enable split link\n", __func__);
+
+	data = MIPI_INP((ctrl_pdata->ctrl_base) + 0x330);
+	/* DMA_LINK_SEL */
+	data |= 0x3 << 12;
+	/* MDP0_LINK_SEL */
+	data |= 0x5 << 20;
+	/* EN */
+	data |= 0x1;
+	/* DSI_SPLIT_LINK_CTRL */
+	MIPI_OUTP((ctrl_pdata->ctrl_base) + 0x330, data);
+}
+
 static void mdss_dsi_mode_setup(struct mdss_panel_data *pdata)
 {
 	struct mdss_dsi_ctrl_pdata *ctrl_pdata = NULL;
@@ -1429,6 +1454,8 @@ static void mdss_dsi_mode_setup(struct mdss_panel_data *pdata)
 	}
 
 	mdss_dsi_dsc_config(ctrl_pdata, dsc);
+
+	mdss_dsi_split_link_setup(ctrl_pdata);
 }
 
 void mdss_dsi_ctrl_setup(struct mdss_dsi_ctrl_pdata *ctrl)
diff --git a/drivers/video/fbdev/msm/mdss_dsi_panel.c b/drivers/video/fbdev/msm/mdss_dsi_panel.c
index 6f20c0ed0455..9faa1531c256 100644
--- a/drivers/video/fbdev/msm/mdss_dsi_panel.c
+++ b/drivers/video/fbdev/msm/mdss_dsi_panel.c
@@ -1350,6 +1350,44 @@ static int mdss_dsi_parse_hdr_settings(struct device_node *np,
 	return 0;
 }
 
+static int mdss_dsi_parse_split_link_settings(struct device_node *np,
+		struct mdss_panel_info *pinfo)
+{
+	u32 tmp;
+	int rc = 0;
+
+	if (!np) {
+		pr_err("%s: device node pointer is NULL\n", __func__);
+		return -EINVAL;
+	}
+
+	if (!pinfo) {
+		pr_err("%s: panel info is NULL\n", __func__);
+		return -EINVAL;
+	}
+
+	pinfo->split_link_enabled = of_property_read_bool(np,
+		"qcom,split-link-enabled");
+
+	if (pinfo->split_link_enabled) {
+		rc = of_property_read_u32(np,
+			"qcom,sublinks-count", &tmp);
+		/* default num of sublink is 1*/
+		pinfo->mipi.num_of_sublinks = (!rc ? tmp : 1);
+
+		rc = of_property_read_u32(np,
+			"qcom,lanes-per-sublink", &tmp);
+		/* default num of lanes per sublink is 1 */
+		pinfo->mipi.lanes_per_sublink = (!rc ? tmp : 1);
+	}
+
+	pr_info("%s: enable %d sublinks-count %d lanes per sublink %d\n",
+		__func__, pinfo->split_link_enabled,
+		pinfo->mipi.num_of_sublinks,
+		pinfo->mipi.lanes_per_sublink);
+	return 0;
+}
+
 static int mdss_dsi_parse_dsc_version(struct device_node *np,
 		struct mdss_panel_timing *timing)
 {
@@ -2734,9 +2772,15 @@ static int mdss_panel_parse_dt(struct device_node *np,
 	pinfo->mipi.data_lane3 = of_property_read_bool(np,
 		"qcom,mdss-dsi-lane-3-state");
 
+	/* parse split link properties */
+	rc = mdss_dsi_parse_split_link_settings(np, pinfo);
+	if (rc)
+		return rc;
+
 	rc = mdss_panel_parse_display_timings(np, &ctrl_pdata->panel_data);
 	if (rc)
 		return rc;
+
 	rc = mdss_dsi_parse_hdr_settings(np, pinfo);
 	if (rc)
 		return rc;
diff --git a/drivers/video/fbdev/msm/mdss_fb.c b/drivers/video/fbdev/msm/mdss_fb.c
index fc47de7692e7..93643246935e 100644
--- a/drivers/video/fbdev/msm/mdss_fb.c
+++ b/drivers/video/fbdev/msm/mdss_fb.c
@@ -374,7 +374,8 @@ static int mdss_fb_get_panel_xres(struct mdss_panel_info *pinfo)
 	xres = pinfo->xres;
 	if (pdata->next && pdata->next->active)
 		xres += mdss_fb_get_panel_xres(&pdata->next->panel_info);
-
+	if (pinfo->split_link_enabled)
+		xres = xres * pinfo->mipi.num_of_sublinks;
 	return xres;
 }
 
diff --git a/drivers/video/fbdev/msm/mdss_fb.h b/drivers/video/fbdev/msm/mdss_fb.h
index f046ff08cbf7..8e5fc5949770 100644
--- a/drivers/video/fbdev/msm/mdss_fb.h
+++ b/drivers/video/fbdev/msm/mdss_fb.h
@@ -392,6 +392,12 @@ static inline void mdss_fb_update_notify_update(struct msm_fb_data_type *mfd)
 	}
 }
 
+/* Function returns true for split link */
+static inline bool is_panel_split_link(struct msm_fb_data_type *mfd)
+{
+	return mfd && mfd->panel_info && mfd->panel_info->split_link_enabled;
+}
+
 /* Function returns true for either any kind of dual display */
 static inline bool is_panel_split(struct msm_fb_data_type *mfd)
 {
diff --git a/drivers/video/fbdev/msm/mdss_mdp.h b/drivers/video/fbdev/msm/mdss_mdp.h
index 2fd047edd3e8..56af021e8cfc 100644
--- a/drivers/video/fbdev/msm/mdss_mdp.h
+++ b/drivers/video/fbdev/msm/mdss_mdp.h
@@ -1267,6 +1267,8 @@ static inline u32 get_panel_width(struct mdss_mdp_ctl *ctl)
 	width = get_panel_xres(&ctl->panel_data->panel_info);
 	if (ctl->panel_data->next && is_pingpong_split(ctl->mfd))
 		width += get_panel_xres(&ctl->panel_data->next->panel_info);
+	else if (is_panel_split_link(ctl->mfd))
+		width *= (ctl->panel_data->panel_info.mipi.num_of_sublinks);
 
 	return width;
 }
diff --git a/drivers/video/fbdev/msm/mdss_mdp_ctl.c b/drivers/video/fbdev/msm/mdss_mdp_ctl.c
index 0495b6e19cc2..a66ecb7a57b7 100644
--- a/drivers/video/fbdev/msm/mdss_mdp_ctl.c
+++ b/drivers/video/fbdev/msm/mdss_mdp_ctl.c
@@ -709,6 +709,8 @@ int mdss_mdp_get_panel_params(struct mdss_mdp_pipe *pipe,
 			*h_total += mdss_panel_get_htotal(
 				&mixer->ctl->panel_data->next->panel_info,
 				false);
+		else if (is_panel_split_link(mixer->ctl->mfd))
+			*h_total *= pinfo->mipi.num_of_sublinks;
 	} else {
 		*v_total = mixer->height;
 		*xres = mixer->width;
@@ -4108,6 +4110,9 @@ static void mdss_mdp_ctl_split_display_enable(int enable,
 			}
 		}
 	}
+
+	if (is_panel_split_link(main_ctl->mfd))
+		upper = lower = 0;
 	writel_relaxed(upper, main_ctl->mdata->mdp_base +
 		MDSS_MDP_REG_SPLIT_DISPLAY_UPPER_PIPE_CTRL);
 	writel_relaxed(lower, main_ctl->mdata->mdp_base +
@@ -4276,7 +4281,8 @@ void mdss_mdp_ctl_restore(bool locked)
 		if (sctl) {
 			mdss_mdp_ctl_restore_sub(sctl);
 			mdss_mdp_ctl_split_display_enable(1, ctl, sctl);
-		} else if (is_pingpong_split(ctl->mfd)) {
+		} else if (is_pingpong_split(ctl->mfd) ||
+				is_panel_split_link(ctl->mfd)) {
 			mdss_mdp_ctl_pp_split_display_enable(1, ctl);
 		}
 
@@ -4403,6 +4409,8 @@ int mdss_mdp_ctl_start(struct mdss_mdp_ctl *ctl, bool handoff)
 		} else if (is_pingpong_split(ctl->mfd)) {
 			ctl->slave_intf_num = (ctl->intf_num + 1);
 			mdss_mdp_ctl_pp_split_display_enable(true, ctl);
+		} else if (is_panel_split_link(ctl->mfd)) {
+			mdss_mdp_ctl_pp_split_display_enable(true, ctl);
 		}
 	}
 
diff --git a/drivers/video/fbdev/msm/mdss_mdp_hwio.h b/drivers/video/fbdev/msm/mdss_mdp_hwio.h
index 7d495232c198..d9e2b042bfc3 100644
--- a/drivers/video/fbdev/msm/mdss_mdp_hwio.h
+++ b/drivers/video/fbdev/msm/mdss_mdp_hwio.h
@@ -850,4 +850,8 @@ enum mdss_mdp_pingpong_index {
 #define MDSS_MDP_REG_TRAFFIC_SHAPER_WR_CLIENT(num)	(0x060 + (num * 4))
 #define MDSS_MDP_REG_TRAFFIC_SHAPER_FIXPOINT_FACTOR	4
 
+#define MDSS_MDP_REG_SPLIT_LINK				0x00060
+#define MDSS_MDP_REG_SPLIT_LINK_LEFT_LINK_EN		BIT(1)
+#define MDSS_MDP_REG_SPLIT_LINK_RIGHT_LINK_EN		BIT(2)
+
 #endif
diff --git a/drivers/video/fbdev/msm/mdss_mdp_intf_video.c b/drivers/video/fbdev/msm/mdss_mdp_intf_video.c
index a3511a1a07ef..ea55203afc51 100644
--- a/drivers/video/fbdev/msm/mdss_mdp_intf_video.c
+++ b/drivers/video/fbdev/msm/mdss_mdp_intf_video.c
@@ -1682,6 +1682,16 @@ static int mdss_mdp_video_display(struct mdss_mdp_ctl *ctl, void *arg)
 
 		mdss_bus_bandwidth_ctrl(true);
 
+		/* configure the split link to both sublinks */
+		if (is_panel_split_link(ctl->mfd)) {
+			mdp_video_write(ctx, MDSS_MDP_REG_SPLIT_LINK, 0x3);
+			/*
+			 * ensure split link register is written before
+			 * enabling timegen
+			 */
+			wmb();
+		}
+
 		mdp_video_write(ctx, MDSS_MDP_REG_INTF_TIMING_ENGINE_EN, 1);
 		wmb();
 
diff --git a/drivers/video/fbdev/msm/mdss_panel.h b/drivers/video/fbdev/msm/mdss_panel.h
index 92413e078244..fa1df94976f9 100644
--- a/drivers/video/fbdev/msm/mdss_panel.h
+++ b/drivers/video/fbdev/msm/mdss_panel.h
@@ -533,6 +533,8 @@ struct mipi_panel_info {
 	char lp11_init;
 	u32  init_delay;
 	u32  post_init_delay;
+	u32  num_of_sublinks;
+	u32  lanes_per_sublink;
 };
 
 struct edp_panel_info {
@@ -847,6 +849,7 @@ struct mdss_panel_info {
 	bool is_lpm_mode;
 	bool is_split_display; /* two DSIs in one display, pp split or not */
 	bool use_pingpong_split;
+	bool split_link_enabled;
 
 	/*
 	 * index[0] = left layer mixer, value of 0 not valid
diff --git a/drivers/video/fbdev/msm/msm_mdss_io_8974.c b/drivers/video/fbdev/msm/msm_mdss_io_8974.c
index 03e78733d168..9c156af6b63c 100644
--- a/drivers/video/fbdev/msm/msm_mdss_io_8974.c
+++ b/drivers/video/fbdev/msm/msm_mdss_io_8974.c
@@ -38,16 +38,23 @@
 #define MDSS_DSI_DSIPHY_GLBL_TEST_CTRL		0x1d4
 #define MDSS_DSI_DSIPHY_CTRL_0			0x170
 #define MDSS_DSI_DSIPHY_CTRL_1			0x174
+#define MDSS_DSI_DSIPHY_CMN_CLK_CFG0		0x0010
+#define MDSS_DSI_DSIPHY_CMN_CLK_CFG1		0x0014
+
+#define MDSS_DSI_NUM_DATA_LANES		0x04
+#define MDSS_DSI_NUM_CLK_LANES		0x01
 
 #define SW_RESET BIT(2)
 #define SW_RESET_PLL BIT(0)
 #define PWRDN_B BIT(7)
 
 /* 8996 */
-#define DATALANE_OFFSET_FROM_BASE_8996	0x100
-#define DSIPHY_CMN_PLL_CNTRL		0x0048
+#define DATALANE_OFFSET_FROM_BASE_8996		0x100
+#define CLKLANE_OFFSET_FROM_BASE_8996		0x300
 #define DATALANE_SIZE_8996			0x80
+#define CLKLANE_SIZE_8996			0x80
 
+#define DSIPHY_CMN_PLL_CNTRL			0x0048
 #define DSIPHY_CMN_GLBL_TEST_CTRL		0x0018
 #define DSIPHY_CMN_CTRL_0			0x001c
 #define DSIPHY_CMN_CTRL_1			0x0020
@@ -55,6 +62,24 @@
 #define DSIPHY_PLL_CLKBUFLR_EN			0x041c
 #define DSIPHY_PLL_PLL_BANDGAP			0x0508
 
+#define DSIPHY_LANE_STRENGTH_CTRL_NUM		0x0002
+#define DSIPHY_LANE_STRENGTH_CTRL_OFFSET	0x0004
+#define DSIPHY_LANE_STRENGTH_CTRL_BASE		0x0038
+
+#define DSIPHY_LANE_CFG_NUM			0x0004
+#define DSIPHY_LANE_CFG_OFFSET			0x0004
+#define DSIPHY_LANE_CFG_BASE			0x0000
+
+#define DSIPHY_LANE_VREG_NUM			0x0001
+#define DSIPHY_LANE_VREG_OFFSET			0x0004
+#define DSIPHY_LANE_VREG_BASE			0x0064
+
+#define DSIPHY_LANE_TIMING_CTRL_NUM		0x0008
+#define DSIPHY_LANE_TIMING_CTRL_OFFSET		0x0004
+#define DSIPHY_LANE_TIMING_CTRL_BASE		0x0018
+
+#define DSIPHY_LANE_TEST_STR			0x0014
+
 #define DSIPHY_LANE_STRENGTH_CTRL_1		0x003c
 #define DSIPHY_LANE_VREG_CNTRL			0x0064
 
@@ -131,6 +156,8 @@
 
 #define DSIPHY_PLL_RESETSM_CNTRL5	0x043c
 
+#define DSIPHY_CMN_CLK_CFG1_SPLIT_LINK	0x1
+
 #define PLL_CALC_DATA(addr0, addr1, data0, data1)      \
 	(((data1) << 24) | ((((addr1)/4) & 0xFF) << 16) | \
 	 ((data0) << 8) | (((addr0)/4) & 0xFF))
@@ -911,35 +938,59 @@ static void mdss_dsi_8996_phy_regulator_enable(
 	int j, off, ln, cnt, ln_off;
 	char *ip;
 	void __iomem *base;
+	struct mdss_panel_info *panel_info;
+
+	if (!ctrl) {
+		pr_warn("%s: null ctrl pdata\n", __func__);
+		return;
+	}
 
+	panel_info = &((ctrl->panel_data).panel_info);
 	pd = &(((ctrl->panel_data).panel_info.mipi).dsi_phy_db);
 
-	if (pd->regulator_len != 5) {
+	if (pd->regulator_len != (MDSS_DSI_NUM_DATA_LANES +
+					MDSS_DSI_NUM_CLK_LANES)) {
 		pr_warn("%s: invalid regulator settings\n", __func__);
 		return;
 	}
 
-	/* 4 lanes + clk lane configuration */
-	for (ln = 0; ln < 5; ln++) {
-		/*
-		 * data lane offset frome base: 0x100
-		 * data lane size: 0x80
-		 */
-		base = ctrl->phy_io.base +
-				DATALANE_OFFSET_FROM_BASE_8996;
-		base += (ln * DATALANE_SIZE_8996); /* lane base */
-
-		/* vreg ctrl, 1 * 5 */
-		cnt = 1;
+	/*
+	 * data lane offset from base: 0x100
+	 * data lane size: 0x80
+	 */
+	base = ctrl->phy_io.base + DATALANE_OFFSET_FROM_BASE_8996;
+	/* data lanes configuration */
+	for (ln = 0; ln < MDSS_DSI_NUM_DATA_LANES; ln++) {
+		/* vreg ctrl, 1 * MDSS_DSI_NUM_DATA_LANES */
+		cnt = DSIPHY_LANE_VREG_NUM;
+		off = DSIPHY_LANE_VREG_BASE;
 		ln_off = cnt * ln;
 		ip = &pd->regulator[ln_off];
-		off = 0x64;
-		for (j = 0; j < cnt; j++, off += 4)
+		for (j = 0; j < cnt; j++) {
 			MIPI_OUTP(base + off, *ip++);
+			off += DSIPHY_LANE_VREG_OFFSET;
+		}
+		base += DATALANE_SIZE_8996; /* next lane */
 	}
 
-	wmb(); /* make sure registers committed */
+	/*
+	 * clk lane offset from base: 0x300
+	 * clk lane size: 0x80
+	 */
+	base = ctrl->phy_io.base + CLKLANE_OFFSET_FROM_BASE_8996;
+	/*
+	 * clk lane configuration for vreg ctrl
+	 * for split link there are two clock lanes, one
+	 * clock lane per sublink needs to be configured
+	 */
+	off = DSIPHY_LANE_VREG_BASE;
+	ln_off = MDSS_DSI_NUM_DATA_LANES;
+	ip = &pd->regulator[ln_off];
+	MIPI_OUTP(base + off, *ip);
+	if (panel_info->split_link_enabled)
+		MIPI_OUTP(base + CLKLANE_SIZE_8996 + off, *ip);
 
+	wmb(); /* make sure registers committed */
 }
 
 static void mdss_dsi_8996_phy_power_off(
@@ -948,31 +999,51 @@ static void mdss_dsi_8996_phy_power_off(
 	int ln;
 	void __iomem *base;
 	u32 data;
+	struct mdss_panel_info *panel_info;
+
+	if (ctrl) {
+		panel_info = &((ctrl->panel_data).panel_info);
+	} else {
+		pr_warn("%s: null ctrl pdata\n", __func__);
+		return;
+	}
 
 	/* Turn off PLL power */
 	data = MIPI_INP(ctrl->phy_io.base + DSIPHY_CMN_CTRL_0);
 	MIPI_OUTP(ctrl->phy_io.base + DSIPHY_CMN_CTRL_0, data & ~BIT(7));
 
-	/* 4 lanes + clk lane configuration */
-	for (ln = 0; ln < 5; ln++) {
-		base = ctrl->phy_io.base +
-				DATALANE_OFFSET_FROM_BASE_8996;
-		base += (ln * DATALANE_SIZE_8996); /* lane base */
-
+	/* data lanes configuration */
+	base = ctrl->phy_io.base + DATALANE_OFFSET_FROM_BASE_8996;
+	for (ln = 0; ln < MDSS_DSI_NUM_DATA_LANES; ln++) {
 		/* turn off phy ldo */
-		MIPI_OUTP(base + DSIPHY_LANE_VREG_CNTRL, 0x1c);
+		MIPI_OUTP(base + DSIPHY_LANE_VREG_BASE, 0x1c);
+		base += DATALANE_SIZE_8996; /* next lane */
 	}
-	MIPI_OUTP((ctrl->phy_io.base) + DSIPHY_CMN_LDO_CNTRL, 0x1c);
 
-	/* 4 lanes + clk lane configuration */
-	for (ln = 0; ln < 5; ln++) {
-		base = ctrl->phy_io.base +
-				DATALANE_OFFSET_FROM_BASE_8996;
-		base += (ln * DATALANE_SIZE_8996); /* lane base */
+	/* clk lane configuration */
+	base = ctrl->phy_io.base + CLKLANE_OFFSET_FROM_BASE_8996;
+	/* turn off phy ldo */
+	MIPI_OUTP(base + DSIPHY_LANE_VREG_BASE, 0x1c);
+	if (panel_info->split_link_enabled)
+		MIPI_OUTP(base + CLKLANE_SIZE_8996 +
+				DSIPHY_LANE_VREG_BASE, 0x1c);
+
+	MIPI_OUTP((ctrl->phy_io.base) + DSIPHY_CMN_LDO_CNTRL, 0x1c);
 
+	/* data lanes configuration */
+	base = ctrl->phy_io.base + DATALANE_OFFSET_FROM_BASE_8996;
+	for (ln = 0; ln < MDSS_DSI_NUM_DATA_LANES; ln++) {
 		MIPI_OUTP(base + DSIPHY_LANE_STRENGTH_CTRL_1, 0x0);
+		base += DATALANE_SIZE_8996; /* next lane */
 	}
 
+	/* clk lane configuration */
+	base = ctrl->phy_io.base + CLKLANE_OFFSET_FROM_BASE_8996;
+	MIPI_OUTP(base + DSIPHY_LANE_STRENGTH_CTRL_1, 0x0);
+	if (panel_info->split_link_enabled)
+		MIPI_OUTP(base + CLKLANE_SIZE_8996 +
+				DSIPHY_LANE_STRENGTH_CTRL_1, 0x0);
+
 	wmb(); /* make sure registers committed */
 }
 
@@ -1008,22 +1079,46 @@ static void mdss_dsi_8996_phy_power_on(
 	struct mdss_dsi_phy_ctrl *pd;
 	char *ip;
 	u32 data;
+	struct mdss_panel_info *panel_info;
 
-	pd = &(((ctrl->panel_data).panel_info.mipi).dsi_phy_db);
+	if (ctrl) {
+		panel_info = &((ctrl->panel_data).panel_info);
+	} else {
+		pr_warn("%s: null ctrl pdata\n", __func__);
+		return;
+	}
 
-	/* 4 lanes + clk lane configuration */
-	for (ln = 0; ln < 5; ln++) {
-		base = ctrl->phy_io.base +
-				DATALANE_OFFSET_FROM_BASE_8996;
-		base += (ln * DATALANE_SIZE_8996); /* lane base */
+	pd = &(((ctrl->panel_data).panel_info.mipi).dsi_phy_db);
 
-		/* strength, 2 * 5 */
-		cnt = 2;
+	/* data lanes configuration */
+	base = ctrl->phy_io.base + DATALANE_OFFSET_FROM_BASE_8996;
+	for (ln = 0; ln < MDSS_DSI_NUM_DATA_LANES; ln++) {
+		/* strength, 2 * MDSS_DSI_NUM_DATA_LANES */
+		cnt = DSIPHY_LANE_STRENGTH_CTRL_NUM;
 		ln_off = cnt * ln;
 		ip = &pd->strength[ln_off];
-		off = 0x38;
-		for (j = 0; j < cnt; j++, off += 4)
+		off = DSIPHY_LANE_STRENGTH_CTRL_BASE;
+		for (j = 0; j < cnt; j++,
+			off += DSIPHY_LANE_STRENGTH_CTRL_OFFSET)
 			MIPI_OUTP(base + off, *ip++);
+		base += DATALANE_SIZE_8996; /* next lane */
+	}
+
+	/*
+	 * clk lane configuration for strength ctrl
+	 * for split link there are two clock lanes, one
+	 * clock lane per sublink needs to be configured
+	 */
+	base = ctrl->phy_io.base + CLKLANE_OFFSET_FROM_BASE_8996;
+	cnt = DSIPHY_LANE_STRENGTH_CTRL_NUM;
+	ln_off = MDSS_DSI_NUM_DATA_LANES;
+	ip = &pd->strength[ln_off];
+	off = DSIPHY_LANE_STRENGTH_CTRL_BASE;
+	for (j = 0; j < cnt; j++,
+		off += DSIPHY_LANE_STRENGTH_CTRL_OFFSET) {
+		MIPI_OUTP(base + off, *ip);
+		if (panel_info->split_link_enabled)
+			MIPI_OUTP(base + CLKLANE_SIZE_8996 + off, *ip);
 	}
 
 	mdss_dsi_8996_phy_regulator_enable(ctrl);
@@ -1051,67 +1146,126 @@ static void mdss_dsi_8996_phy_config(struct mdss_dsi_ctrl_pdata *ctrl)
 	int j, off, ln, cnt, ln_off;
 	char *ip;
 	void __iomem *base;
+	struct mdss_panel_info *panel_info;
+	int num_of_lanes = 0;
+
+	if (ctrl) {
+		panel_info = &((ctrl->panel_data).panel_info);
+	} else {
+		pr_warn("%s: null ctrl pdata\n", __func__);
+		return;
+	}
 
 	pd = &(((ctrl->panel_data).panel_info.mipi).dsi_phy_db);
+	num_of_lanes = MDSS_DSI_NUM_DATA_LANES + MDSS_DSI_NUM_CLK_LANES;
 
 	MIPI_OUTP((ctrl->phy_io.base) + DSIPHY_CMN_LDO_CNTRL, 0x1c);
 
 	/* clk_en */
 	MIPI_OUTP((ctrl->phy_io.base) + DSIPHY_CMN_GLBL_TEST_CTRL, 0x1);
 
-	if (pd->lanecfg_len != 20) {
+	if (pd->lanecfg_len != (num_of_lanes * DSIPHY_LANE_CFG_NUM)) {
 		pr_err("%s: wrong lane cfg\n", __func__);
 		return;
 	}
 
-	if (pd->strength_len != 10) {
+	if (pd->strength_len != (num_of_lanes *
+				DSIPHY_LANE_STRENGTH_CTRL_NUM)) {
 		pr_err("%s: wrong strength ctrl\n", __func__);
 		return;
 	}
 
-	if (pd->regulator_len != 5) {
+	if (pd->regulator_len != (num_of_lanes * DSIPHY_LANE_VREG_NUM)) {
 		pr_err("%s: wrong regulator setting\n", __func__);
 		return;
 	}
 
-	/* 4 lanes + clk lane configuration */
-	for (ln = 0; ln < 5; ln++) {
-		/*
-		 * data lane offset frome base: 0x100
-		 * data lane size: 0x80
-		 */
-		base = ctrl->phy_io.base +
-				DATALANE_OFFSET_FROM_BASE_8996;
-		base += (ln * DATALANE_SIZE_8996); /* lane base */
-
-		/* lane cfg, 4 * 5 */
-		cnt = 4;
+	/* data lanes configuration */
+	base = ctrl->phy_io.base + DATALANE_OFFSET_FROM_BASE_8996;
+	for (ln = 0; ln < MDSS_DSI_NUM_DATA_LANES; ln++) {
+		/* lane cfg, 4 * MDSS_DSI_NUM_DATA_LANES */
+		cnt = DSIPHY_LANE_CFG_NUM;
+		off = DSIPHY_LANE_CFG_BASE;
 		ln_off = cnt * ln;
 		ip = &pd->lanecfg[ln_off];
-		off = 0x0;
 		for (j = 0; j < cnt; j++) {
 			MIPI_OUTP(base + off, *ip++);
-			off += 4;
+			off += DSIPHY_LANE_CFG_OFFSET;
 		}
 
 		/* test str */
-		MIPI_OUTP(base + 0x14, 0x0088);	/* fixed */
+		MIPI_OUTP(base + DSIPHY_LANE_TEST_STR, 0x88);	/* fixed */
 
-		/* phy timing, 8 * 5 */
-		cnt = 8;
+		/* phy timing, 8 * MDSS_DSI_NUM_DATA_LANES */
+		cnt = DSIPHY_LANE_TIMING_CTRL_NUM;
+		off = DSIPHY_LANE_TIMING_CTRL_BASE;
 		ln_off = cnt * ln;
 		ip = &pd->timing_8996[ln_off];
-		off = 0x18;
-		for (j = 0; j < cnt; j++, off += 4)
+		for (j = 0; j < cnt; j++) {
 			MIPI_OUTP(base + off, *ip++);
+			off += DSIPHY_LANE_TIMING_CTRL_OFFSET;
+		}
 
-		/* strength, 2 * 5 */
-		cnt = 2;
+		/* strength, 2 * MDSS_DSI_NUM_DATA_LANES */
+		cnt = DSIPHY_LANE_STRENGTH_CTRL_NUM;
+		off = DSIPHY_LANE_STRENGTH_CTRL_BASE;
 		ln_off = cnt * ln;
 		ip = &pd->strength[ln_off];
-		off = 0x38;
-		for (j = 0; j < cnt; j++, off += 4)
+		for (j = 0; j < cnt; j++) {
 			MIPI_OUTP(base + off, *ip++);
+			off += DSIPHY_LANE_STRENGTH_CTRL_OFFSET;
+		}
+
+		base += DATALANE_SIZE_8996; /* next lane */
+	}
+
+	/*
+	 * clk lane configuration
+	 * for split link there are two clock lanes, one
+	 * clock lane per sublink needs to be configured
+	 */
+	base = ctrl->phy_io.base + CLKLANE_OFFSET_FROM_BASE_8996;
+	cnt = DSIPHY_LANE_CFG_NUM;
+	off = DSIPHY_LANE_CFG_BASE;
+	ln_off = cnt * MDSS_DSI_NUM_DATA_LANES;
+	ip = &pd->lanecfg[ln_off];
+	for (j = 0; j < cnt; j++, *ip++) {
+		MIPI_OUTP(base + off, *ip);
+		if (panel_info->split_link_enabled)
+			MIPI_OUTP(base + CLKLANE_SIZE_8996 + off, *ip);
+		off += DSIPHY_LANE_CFG_OFFSET;
+	}
+
+	/* test str */
+	MIPI_OUTP(base + DSIPHY_LANE_TEST_STR, 0x88);	/* fixed */
+	if (panel_info->split_link_enabled)
+		MIPI_OUTP(base + CLKLANE_SIZE_8996 + off, 0x88);
+
+	cnt = DSIPHY_LANE_TIMING_CTRL_NUM;
+	off = DSIPHY_LANE_TIMING_CTRL_BASE;
+	ln_off = cnt * MDSS_DSI_NUM_DATA_LANES;
+	ip = &pd->timing_8996[ln_off];
+	for (j = 0; j < cnt; j++, *ip++) {
+		MIPI_OUTP(base + off, *ip);
+		if (panel_info->split_link_enabled)
+			MIPI_OUTP(base + CLKLANE_SIZE_8996 + off, *ip);
+		off += DSIPHY_LANE_TIMING_CTRL_OFFSET;
+	}
+
+	/*
+	 * clk lane configuration for timing
+	 * for split link there are two clock lanes, one
+	 * clock lane per sublink needs to be configured
+	 */
+	cnt = DSIPHY_LANE_STRENGTH_CTRL_NUM;
+	off = DSIPHY_LANE_STRENGTH_CTRL_BASE;
+	ln_off = cnt * MDSS_DSI_NUM_DATA_LANES;
+	ip = &pd->strength[ln_off];
+	for (j = 0; j < cnt; j++, *ip++) {
+		MIPI_OUTP(base + off, *ip);
+		if (panel_info->split_link_enabled)
+			MIPI_OUTP(base + CLKLANE_SIZE_8996 + off, *ip);
+		off += DSIPHY_LANE_STRENGTH_CTRL_OFFSET;
 	}
 
 	wmb(); /* make sure registers committed */
@@ -1665,6 +1819,9 @@ int mdss_dsi_clk_div_config(struct mdss_panel_info *panel_info,
 	u32 dsi_pclk_rate;
 	u8 lanes = 0, bpp;
 
+	if (!panel_info)
+		return -EINVAL;
+
 	if (panel_info->mipi.data_lane3)
 		lanes += 1;
 	if (panel_info->mipi.data_lane2)
@@ -1690,6 +1847,8 @@ int mdss_dsi_clk_div_config(struct mdss_panel_info *panel_info,
 	}
 
 	h_period = mdss_panel_get_htotal(panel_info, true);
+	if (panel_info->split_link_enabled)
+		h_period *= panel_info->mipi.num_of_sublinks;
 	v_period = mdss_panel_get_vtotal(panel_info);
 
 	if (ctrl_pdata->refresh_clk_rate || is_diff_frame_rate(panel_info,
@@ -1710,7 +1869,12 @@ int mdss_dsi_clk_div_config(struct mdss_panel_info *panel_info,
 
 	clk_rate = panel_info->clk_rate;
 	do_div(clk_rate, 8 * bpp);
-	dsi_pclk_rate = (u32) clk_rate * lanes;
+
+	if (panel_info->split_link_enabled)
+		dsi_pclk_rate = (u32) clk_rate *
+			panel_info->mipi.lanes_per_sublink;
+	else
+		dsi_pclk_rate = (u32) clk_rate * lanes;
 
 	if ((dsi_pclk_rate < 3300000) || (dsi_pclk_rate > 250000000))
 		dsi_pclk_rate = 35000000;
@@ -2320,6 +2484,32 @@ int mdss_dsi_pre_clkoff_cb(void *priv,
 	return rc;
 }
 
+static void mdss_dsi_split_link_clk_cfg(struct mdss_dsi_ctrl_pdata *ctrl,
+						int enable)
+{
+	struct mdss_panel_data *pdata = NULL;
+	void __iomem *base;
+	u32 data = 0;
+
+	if (ctrl)
+		pdata = &ctrl->panel_data;
+	else {
+		pr_err("%s: ctrl pdata is NULL\n", __func__);
+		return;
+	}
+
+	/*
+	 * for split link there are two clock lanes, and
+	 * both clock lanes needs to be enabled
+	 */
+	if (pdata->panel_info.split_link_enabled) {
+		base = ctrl->phy_io.base;
+		data = MIPI_INP(base + MDSS_DSI_DSIPHY_CMN_CLK_CFG1);
+		data |= (enable << DSIPHY_CMN_CLK_CFG1_SPLIT_LINK);
+		MIPI_OUTP(base + MDSS_DSI_DSIPHY_CMN_CLK_CFG1, data);
+	}
+}
+
 int mdss_dsi_post_clkon_cb(void *priv,
 			   enum mdss_dsi_clk_type clk,
 			   enum mdss_dsi_clk_state curr_state)
@@ -2393,6 +2583,9 @@ int mdss_dsi_post_clkon_cb(void *priv,
 		}
 		if (pdata->panel_info.mipi.force_clk_lane_hs)
 			mdss_dsi_cfg_lane_ctrl(ctrl, BIT(28), 1);
+
+		/* enable split link for cmn clk cfg1 */
+		mdss_dsi_split_link_clk_cfg(ctrl, 1);
 	}
 error:
 	return rc;