drm: rcar-du: Add r8a779a0 device support

Extend the rcar_du_device_info structure and rcar_du_output enum to
support DSI outputs and utilise these additions to provide support for
the R8A779A0 V3U platform.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

drivers/gpu/drm/rcar-du/rcar_du_crtc.c

@@ -31,6 +31,7 @@
 #include "rcar_du_regs.h"
 #include "rcar_du_vsp.h"
 #include "rcar_lvds.h"
+#include "rcar_mipi_dsi.h"
 
 static u32 rcar_du_crtc_read(struct rcar_du_crtc *rcrtc, u32 reg)
 {
@@ -737,6 +738,16 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
 		rcar_lvds_clk_enable(bridge, mode->clock * 1000);
 	}
 
+	/*
+	 * On V3U the dot clock is provided by the MIPI DSI encoder which is
+	 * attached to DU. So, the MIPI DSI module should be enable before starting DU.
+	 */
+	if (rcdu->info->dsi_clk_mask & BIT(rcrtc->index)) {
+		struct drm_bridge *bridge = rcdu->dsi[rcrtc->index];
+
+		rcar_mipi_dsi_clk_enable(bridge);
+	}
+
 	rcar_du_crtc_start(rcrtc);
 
 	/*
@@ -770,6 +781,15 @@ static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
 		rcar_lvds_clk_disable(bridge);
 	}
 
+	if (rcdu->info->dsi_clk_mask & BIT(rcrtc->index)) {
+		struct drm_bridge *bridge = rcdu->dsi[rcrtc->index];
+
+		/*
+		 * Disable the MIPI DSI clock output
+		 */
+		rcar_mipi_dsi_clk_disable(bridge);
+	}
+
 	spin_lock_irq(&crtc->dev->event_lock);
 	if (crtc->state->event) {
 		drm_crtc_send_vblank_event(crtc, crtc->state->event);

drivers/gpu/drm/rcar-du/rcar_du_crtc.h

@@ -96,6 +96,8 @@ struct rcar_du_crtc_state {
 enum rcar_du_output {
 	RCAR_DU_OUTPUT_DPAD0,
 	RCAR_DU_OUTPUT_DPAD1,
+	RCAR_DU_OUTPUT_DSI0,
+	RCAR_DU_OUTPUT_DSI1,
 	RCAR_DU_OUTPUT_HDMI0,
 	RCAR_DU_OUTPUT_HDMI1,
 	RCAR_DU_OUTPUT_LVDS0,

drivers/gpu/drm/rcar-du/rcar_du_drv.c

@@ -473,6 +473,26 @@ static const struct rcar_du_device_info rcar_du_r8a7799x_info = {
 	.lvds_clk_mask =  BIT(1) | BIT(0),
 };
 
+static const struct rcar_du_device_info rcar_du_r8a779a0_info = {
+	.gen = 3,
+	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
+		  | RCAR_DU_FEATURE_VSP1_SOURCE,
+	.channels_mask = BIT(1) | BIT(0),
+	.routes = {
+		/* R8A779A0 has two MIPI DSI outputs. */
+		[RCAR_DU_OUTPUT_DSI0] = {
+			.possible_crtcs = BIT(0),
+			.port = 0,
+		},
+		[RCAR_DU_OUTPUT_DSI1] = {
+			.possible_crtcs = BIT(1),
+			.port = 1,
+		},
+	},
+	.num_dsi = 2,
+	.dsi_clk_mask =  BIT(1) | BIT(0),
+};
+
 static const struct of_device_id rcar_du_of_table[] = {
 	{ .compatible = "renesas,du-r8a7742", .data = &rcar_du_r8a7790_info },
 	{ .compatible = "renesas,du-r8a7743", .data = &rzg1_du_r8a7743_info },
@@ -497,6 +517,7 @@ static const struct of_device_id rcar_du_of_table[] = {
 	{ .compatible = "renesas,du-r8a77980", .data = &rcar_du_r8a77970_info },
 	{ .compatible = "renesas,du-r8a77990", .data = &rcar_du_r8a7799x_info },
 	{ .compatible = "renesas,du-r8a77995", .data = &rcar_du_r8a7799x_info },
+	{ .compatible = "renesas,du-r8a779a0", .data = &rcar_du_r8a779a0_info },
 	{ }
 };
 

drivers/gpu/drm/rcar-du/rcar_du_drv.h

@@ -54,8 +54,10 @@ struct rcar_du_output_routing {
  * @quirks: device quirks (RCAR_DU_QUIRK_*)
  * @channels_mask: bit mask of available DU channels
  * @routes: array of CRTC to output routes, indexed by output (RCAR_DU_OUTPUT_*)
+ * @num_dsi: number of internal DSI encoders
  * @num_lvds: number of internal LVDS encoders
  * @dpll_mask: bit mask of DU channels equipped with a DPLL
+ * @dsi_clk_mask: bitmask of channels that can use the DSI clock as dot clock
  * @lvds_clk_mask: bitmask of channels that can use the LVDS clock as dot clock
  */
 struct rcar_du_device_info {
@@ -64,15 +66,18 @@ struct rcar_du_device_info {
 	unsigned int quirks;
 	unsigned int channels_mask;
 	struct rcar_du_output_routing routes[RCAR_DU_OUTPUT_MAX];
+	unsigned int num_dsi;
 	unsigned int num_lvds;
 	unsigned int dpll_mask;
+	unsigned int dsi_clk_mask;
 	unsigned int lvds_clk_mask;
 };
 
 #define RCAR_DU_MAX_CRTCS		4
 #define RCAR_DU_MAX_GROUPS		DIV_ROUND_UP(RCAR_DU_MAX_CRTCS, 2)
 #define RCAR_DU_MAX_VSPS		4
 #define RCAR_DU_MAX_LVDS		2
+#define RCAR_DU_MAX_DSI			2
 
 struct rcar_du_device {
 	struct device *dev;
@@ -89,6 +94,7 @@ struct rcar_du_device {
 	struct platform_device *cmms[RCAR_DU_MAX_CRTCS];
 	struct rcar_du_vsp vsps[RCAR_DU_MAX_VSPS];
 	struct drm_bridge *lvds[RCAR_DU_MAX_LVDS];
+	struct drm_bridge *dsi[RCAR_DU_MAX_DSI];
 
 	struct {
 		struct drm_property *colorkey;

drivers/gpu/drm/rcar-du/rcar_du_encoder.c

@@ -80,6 +80,10 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
 		if (output == RCAR_DU_OUTPUT_LVDS0 ||
 		    output == RCAR_DU_OUTPUT_LVDS1)
 			rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = bridge;
+
+		if (output == RCAR_DU_OUTPUT_DSI0 ||
+		    output == RCAR_DU_OUTPUT_DSI1)
+			rcdu->dsi[output - RCAR_DU_OUTPUT_DSI0] = bridge;
 	}
 
 	/*

drivers/gpu/drm/rcar-du/rcar_du_group.c

@@ -124,6 +124,8 @@ static void rcar_du_group_setup_didsr(struct rcar_du_group *rgrp)
 		if (rcdu->info->lvds_clk_mask & BIT(rcrtc->index))
 			didsr |= DIDSR_LCDS_LVDS0(i)
 			      |  DIDSR_PDCS_CLK(i, 0);
+		else if (rcdu->info->dsi_clk_mask & BIT(rcrtc->index))
+			didsr |= DIDSR_LCDS_LVDS0(i);
 		else
 			didsr |= DIDSR_LCDS_DCLKIN(i)
 			      |  DIDSR_PDCS_CLK(i, 0);