drm: rcar-du: Add interlaced feature flag

Upcoming implementations of the R-Car DU have removed support for
interlaced display pipelines. Provide a means to determine this based on
the feature flags of the hardware configuration structs.
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

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

@@ -681,11 +681,25 @@ static void rcar_du_crtc_atomic_flush(struct drm_crtc *crtc,
 		rcar_du_vsp_atomic_flush(rcrtc);
 }
 
+enum drm_mode_status rcar_du_crtc_mode_valid(struct drm_crtc *crtc,
+				   const struct drm_display_mode *mode)
+{
+	struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
+	struct rcar_du_device *rcdu = rcrtc->group->dev;
+	bool interlaced = mode->flags & DRM_MODE_FLAG_INTERLACE;
+
+	if (interlaced && !rcar_du_has(rcdu, RCAR_DU_FEATURE_INTERLACED))
+		return MODE_NO_INTERLACE;
+
+	return MODE_OK;
+}
+
 static const struct drm_crtc_helper_funcs crtc_helper_funcs = {
 	.atomic_begin = rcar_du_crtc_atomic_begin,
 	.atomic_flush = rcar_du_crtc_atomic_flush,
 	.atomic_enable = rcar_du_crtc_atomic_enable,
 	.atomic_disable = rcar_du_crtc_atomic_disable,
+	.mode_valid = rcar_du_crtc_mode_valid,
 };
 
 static void rcar_du_crtc_crc_init(struct rcar_du_crtc *rcrtc)

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

@@ -35,7 +35,8 @@
 static const struct rcar_du_device_info rzg1_du_r8a7743_info = {
 	.gen = 2,
 	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
-		  | RCAR_DU_FEATURE_EXT_CTRL_REGS,
+		  | RCAR_DU_FEATURE_EXT_CTRL_REGS
+		  | RCAR_DU_FEATURE_INTERLACED,
 	.channels_mask = BIT(1) | BIT(0),
 	.routes = {
 		/*
@@ -56,7 +57,8 @@ static const struct rcar_du_device_info rzg1_du_r8a7743_info = {
 static const struct rcar_du_device_info rzg1_du_r8a7745_info = {
 	.gen = 2,
 	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
-		  | RCAR_DU_FEATURE_EXT_CTRL_REGS,
+		  | RCAR_DU_FEATURE_EXT_CTRL_REGS
+		  | RCAR_DU_FEATURE_INTERLACED,
 	.channels_mask = BIT(1) | BIT(0),
 	.routes = {
 		/*
@@ -75,7 +77,7 @@ static const struct rcar_du_device_info rzg1_du_r8a7745_info = {
 
 static const struct rcar_du_device_info rcar_du_r8a7779_info = {
 	.gen = 2,
-	.features = 0,
+	.features = RCAR_DU_FEATURE_INTERLACED,
 	.channels_mask = BIT(1) | BIT(0),
 	.routes = {
 		/*
@@ -96,7 +98,8 @@ static const struct rcar_du_device_info rcar_du_r8a7779_info = {
 static const struct rcar_du_device_info rcar_du_r8a7790_info = {
 	.gen = 2,
 	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
-		  | RCAR_DU_FEATURE_EXT_CTRL_REGS,
+		  | RCAR_DU_FEATURE_EXT_CTRL_REGS
+		  | RCAR_DU_FEATURE_INTERLACED,
 	.quirks = RCAR_DU_QUIRK_ALIGN_128B,
 	.channels_mask = BIT(2) | BIT(1) | BIT(0),
 	.routes = {
@@ -124,7 +127,8 @@ static const struct rcar_du_device_info rcar_du_r8a7790_info = {
 static const struct rcar_du_device_info rcar_du_r8a7791_info = {
 	.gen = 2,
 	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
-		  | RCAR_DU_FEATURE_EXT_CTRL_REGS,
+		  | RCAR_DU_FEATURE_EXT_CTRL_REGS
+		  | RCAR_DU_FEATURE_INTERLACED,
 	.channels_mask = BIT(1) | BIT(0),
 	.routes = {
 		/*
@@ -146,7 +150,8 @@ static const struct rcar_du_device_info rcar_du_r8a7791_info = {
 static const struct rcar_du_device_info rcar_du_r8a7792_info = {
 	.gen = 2,
 	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
-		  | RCAR_DU_FEATURE_EXT_CTRL_REGS,
+		  | RCAR_DU_FEATURE_EXT_CTRL_REGS
+		  | RCAR_DU_FEATURE_INTERLACED,
 	.channels_mask = BIT(1) | BIT(0),
 	.routes = {
 		/* R8A7792 has two RGB outputs. */
@@ -164,7 +169,8 @@ static const struct rcar_du_device_info rcar_du_r8a7792_info = {
 static const struct rcar_du_device_info rcar_du_r8a7794_info = {
 	.gen = 2,
 	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
-		  | RCAR_DU_FEATURE_EXT_CTRL_REGS,
+		  | RCAR_DU_FEATURE_EXT_CTRL_REGS
+		  | RCAR_DU_FEATURE_INTERLACED,
 	.channels_mask = BIT(1) | BIT(0),
 	.routes = {
 		/*
@@ -186,7 +192,8 @@ static const struct rcar_du_device_info rcar_du_r8a7795_info = {
 	.gen = 3,
 	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
 		  | RCAR_DU_FEATURE_EXT_CTRL_REGS
-		  | RCAR_DU_FEATURE_VSP1_SOURCE,
+		  | RCAR_DU_FEATURE_VSP1_SOURCE
+		  | RCAR_DU_FEATURE_INTERLACED,
 	.channels_mask = BIT(3) | BIT(2) | BIT(1) | BIT(0),
 	.routes = {
 		/*
@@ -218,7 +225,8 @@ static const struct rcar_du_device_info rcar_du_r8a7796_info = {
 	.gen = 3,
 	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
 		  | RCAR_DU_FEATURE_EXT_CTRL_REGS
-		  | RCAR_DU_FEATURE_VSP1_SOURCE,
+		  | RCAR_DU_FEATURE_VSP1_SOURCE
+		  | RCAR_DU_FEATURE_INTERLACED,
 	.channels_mask = BIT(2) | BIT(1) | BIT(0),
 	.routes = {
 		/*
@@ -246,7 +254,8 @@ static const struct rcar_du_device_info rcar_du_r8a77965_info = {
 	.gen = 3,
 	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
 		  | RCAR_DU_FEATURE_EXT_CTRL_REGS
-		  | RCAR_DU_FEATURE_VSP1_SOURCE,
+		  | RCAR_DU_FEATURE_VSP1_SOURCE
+		  | RCAR_DU_FEATURE_INTERLACED,
 	.channels_mask = BIT(3) | BIT(1) | BIT(0),
 	.routes = {
 		/*
@@ -274,7 +283,8 @@ static const struct rcar_du_device_info rcar_du_r8a77970_info = {
 	.gen = 3,
 	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
 		  | RCAR_DU_FEATURE_EXT_CTRL_REGS
-		  | RCAR_DU_FEATURE_VSP1_SOURCE,
+		  | RCAR_DU_FEATURE_VSP1_SOURCE
+		  | RCAR_DU_FEATURE_INTERLACED,
 	.channels_mask = BIT(0),
 	.routes = {
 		/* R8A77970 has one RGB output and one LVDS output. */

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

@@ -26,6 +26,7 @@ struct rcar_du_device;
 #define RCAR_DU_FEATURE_CRTC_IRQ_CLOCK	BIT(0)	/* Per-CRTC IRQ and clock */
 #define RCAR_DU_FEATURE_EXT_CTRL_REGS	BIT(1)	/* Has extended control registers */
 #define RCAR_DU_FEATURE_VSP1_SOURCE	BIT(2)	/* Has inputs from VSP1 */
+#define RCAR_DU_FEATURE_INTERLACED	BIT(3)	/* HW supports interlaced */
 
 #define RCAR_DU_QUIRK_ALIGN_128B	BIT(0)	/* Align pitches to 128 bytes */