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>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

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

@@ -490,6 +490,25 @@ 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
+		  | 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,
+		},
+	},
+	.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 },
@@ -514,6 +533,7 @@ 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

@@ -37,6 +37,8 @@ struct rcar_du_device;
 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,
@@ -68,6 +70,7 @@ struct rcar_du_output_routing {
  * @routes: array of CRTC to output routes, indexed by output (RCAR_DU_OUTPUT_*)
  * @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 {
@@ -78,6 +81,7 @@ struct rcar_du_device_info {
 	struct rcar_du_output_routing routes[RCAR_DU_OUTPUT_MAX];
 	unsigned int num_lvds;
 	unsigned int dpll_mask;
+	unsigned int dsi_clk_mask;
 	unsigned int lvds_clk_mask;
 };
 

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_LDCS_LVDS0(i)
 			      |  DIDSR_PDCS_CLK(i, 0);
+		else if (rcdu->info->dsi_clk_mask & BIT(rcrtc->index))
+			didsr |= DIDSR_LDCS_DSI(i);
 		else
 			didsr |= DIDSR_LDCS_DCLKIN(i)
 			      |  DIDSR_PDCS_CLK(i, 0);

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

@@ -258,6 +258,7 @@
 #define DIDSR			0x20028
 #define DIDSR_CODE		(0x7790 << 16)
 #define DIDSR_LDCS_DCLKIN(n)	(0 << (8 + (n) * 2))
+#define DIDSR_LDCS_DSI(n)	(2 << (8 + (n) * 2))	/* V3U only */
 #define DIDSR_LDCS_LVDS0(n)	(2 << (8 + (n) * 2))
 #define DIDSR_LDCS_LVDS1(n)	(3 << (8 + (n) * 2))
 #define DIDSR_LDCS_MASK(n)	(3 << (8 + (n) * 2))