drm: renesas: rz-du: Add support for RZ/T2H SoC

The RZ/T2H (R9A09G077) SoC includes a DU with a DPI interface,
supporting resolutions up to WXGA with two RPFs for layer blending.
Unlike earlier RZ/G2L SoCs, RZ/T2H requires explicit assertion of a
DPI output-enable signal (DU_MCR0_DPI_EN) during CRTC startup.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Link: https://patch.msgid.link/20260519160825.4082566-6-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>

3 files changed, 30 insertions, 1 deletions

diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_du_crtc.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_du_crtc.c
index 48065f4952a3..d0f01aa642a7 100644
--- a/drivers/gpu/drm/renesas/rz-du/rzg2l_du_crtc.c
+++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_du_crtc.c
@@ -28,6 +28,7 @@
 #include "rzg2l_du_vsp.h"
 
 #define DU_MCR0			0x00
+#define DU_MCR0_DPI_EN		BIT(0)
 #define DU_MCR0_DI_EN		BIT(8)
 
 #define DU_DITR0		0x10
@@ -217,8 +218,12 @@ static void rzg2l_du_crtc_put(struct rzg2l_du_crtc *rcrtc)
 static void rzg2l_du_start_stop(struct rzg2l_du_crtc *rcrtc, bool start)
 {
 	struct rzg2l_du_device *rcdu = rcrtc->dev;
+	u32 val = DU_MCR0_DI_EN;
 
-	writel(start ? DU_MCR0_DI_EN : 0, rcdu->mmio + DU_MCR0);
+	if (start && rzg2l_du_has(rcdu, RZG2L_DU_FEATURE_DPIO_OE))
+		val |= DU_MCR0_DPI_EN;
+
+	writel(start ? val : 0, rcdu->mmio + DU_MCR0);
 }
 
 static void rzg2l_du_crtc_start(struct rzg2l_du_crtc *rcrtc)
diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.c
index 1e4b9f38c55b..3d13f61d3c97 100644
--- a/drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.c
+++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.c
@@ -65,10 +65,24 @@ static const struct rzg2l_du_device_info rzg2l_du_r9a09g057_info = {
 	},
 };
 
+static const struct rzg2l_du_device_info rzg2l_du_r9a09g077_info = {
+	.channels_mask = BIT(0),
+	.routes = {
+		[RZG2L_DU_OUTPUT_DPAD0] = {
+			.possible_outputs = BIT(0),
+			.port = 0,
+		},
+	},
+	.features = RZG2L_DU_FEATURE_DPIO_OE,
+	.mode_clock_min = 5000,
+	.mode_clock_max = 100000,
+};
+
 static const struct of_device_id rzg2l_du_of_table[] = {
 	{ .compatible = "renesas,r9a07g043u-du", .data = &rzg2l_du_r9a07g043u_info },
 	{ .compatible = "renesas,r9a07g044-du", .data = &rzg2l_du_r9a07g044_info },
 	{ .compatible = "renesas,r9a09g057-du", .data = &rzg2l_du_r9a09g057_info },
+	{ .compatible = "renesas,r9a09g077-du", .data = &rzg2l_du_r9a09g077_info },
 	{ /* sentinel */ }
 };
 
diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.h b/drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.h
index 885558eb9547..baf076d69cda 100644
--- a/drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.h
+++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_du_drv.h
@@ -20,6 +20,8 @@
 struct device;
 struct drm_property;
 
+#define RZG2L_DU_FEATURE_DPIO_OE	BIT(0)	/* Has DPIO output enable control */
+
 enum rzg2l_du_output {
 	RZG2L_DU_OUTPUT_DSI0,
 	RZG2L_DU_OUTPUT_DPAD0,
@@ -46,12 +48,14 @@ struct rzg2l_du_output_routing {
  * @routes: array of CRTC to output routes, indexed by output (RZG2L_DU_OUTPUT_*)
  * @mode_clock_min: minimum pixel clock in kHz
  * @mode_clock_max: maximum pixel clock in kHz
+ * @features: device features (RZG2L_DU_FEATURE_*)
  */
 struct rzg2l_du_device_info {
 	unsigned int channels_mask;
 	struct rzg2l_du_output_routing routes[RZG2L_DU_OUTPUT_MAX];
 	u32 mode_clock_min;
 	u32 mode_clock_max;
+	unsigned int features;
 };
 
 #define RZG2L_DU_MAX_CRTCS		1
@@ -77,6 +81,12 @@ static inline struct rzg2l_du_device *to_rzg2l_du_device(struct drm_device *dev)
 	return container_of(dev, struct rzg2l_du_device, ddev);
 }
 
+static inline bool rzg2l_du_has(struct rzg2l_du_device *rcdu,
+				unsigned int feature)
+{
+	return rcdu->info->features & feature;
+}
+
 const char *rzg2l_du_output_name(enum rzg2l_du_output output);
 
 #endif /* __RZG2L_DU_DRV_H__ */