drm/omap: Add ability to check if requested plane modes can be supported

We currently assume that an overlay has the same maximum width and
maximum height as the overlay manager. This assumption is incorrect. On
some variants the overlay manager maximum width is twice the maximum
width that the overlay can handle. We need to add the appropriate data
per variant as well as export a helper function to retrieve the data so
check can be made dynamically in omap_plane_atomic_check().
Signed-off-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211117141928.771082-3-narmstrong@baylibre.com

drivers/gpu/drm/omapdrm/dss/dispc.c

@@ -92,6 +92,8 @@ struct dispc_features {
 	u8 mgr_height_start;
 	u16 mgr_width_max;
 	u16 mgr_height_max;
+	u16 ovl_width_max;
+	u16 ovl_height_max;
 	unsigned long max_lcd_pclk;
 	unsigned long max_tv_pclk;
 	unsigned int max_downscale;
@@ -2599,6 +2601,12 @@ static int dispc_ovl_calc_scaling(struct dispc_device *dispc,
 	return 0;
 }
 
+void dispc_ovl_get_max_size(struct dispc_device *dispc, u16 *width, u16 *height)
+{
+	*width = dispc->feat->ovl_width_max;
+	*height = dispc->feat->ovl_height_max;
+}
+
 static int dispc_ovl_setup_common(struct dispc_device *dispc,
 				  enum omap_plane_id plane,
 				  enum omap_overlay_caps caps,
@@ -4240,6 +4248,8 @@ static const struct dispc_features omap24xx_dispc_feats = {
 	.mgr_height_start	=	26,
 	.mgr_width_max		=	2048,
 	.mgr_height_max		=	2048,
+	.ovl_width_max		=	2048,
+	.ovl_height_max		=	2048,
 	.max_lcd_pclk		=	66500000,
 	.max_downscale		=	2,
 	/*
@@ -4278,6 +4288,8 @@ static const struct dispc_features omap34xx_rev1_0_dispc_feats = {
 	.mgr_height_start	=	26,
 	.mgr_width_max		=	2048,
 	.mgr_height_max		=	2048,
+	.ovl_width_max		=	2048,
+	.ovl_height_max		=	2048,
 	.max_lcd_pclk		=	173000000,
 	.max_tv_pclk		=	59000000,
 	.max_downscale		=	4,
@@ -4313,6 +4325,8 @@ static const struct dispc_features omap34xx_rev3_0_dispc_feats = {
 	.mgr_height_start	=	26,
 	.mgr_width_max		=	2048,
 	.mgr_height_max		=	2048,
+	.ovl_width_max		=	2048,
+	.ovl_height_max		=	2048,
 	.max_lcd_pclk		=	173000000,
 	.max_tv_pclk		=	59000000,
 	.max_downscale		=	4,
@@ -4348,6 +4362,8 @@ static const struct dispc_features omap36xx_dispc_feats = {
 	.mgr_height_start	=	26,
 	.mgr_width_max		=	2048,
 	.mgr_height_max		=	2048,
+	.ovl_width_max		=	2048,
+	.ovl_height_max		=	2048,
 	.max_lcd_pclk		=	173000000,
 	.max_tv_pclk		=	59000000,
 	.max_downscale		=	4,
@@ -4383,6 +4399,8 @@ static const struct dispc_features am43xx_dispc_feats = {
 	.mgr_height_start	=	26,
 	.mgr_width_max		=	2048,
 	.mgr_height_max		=	2048,
+	.ovl_width_max		=	2048,
+	.ovl_height_max		=	2048,
 	.max_lcd_pclk		=	173000000,
 	.max_tv_pclk		=	59000000,
 	.max_downscale		=	4,
@@ -4418,6 +4436,8 @@ static const struct dispc_features omap44xx_dispc_feats = {
 	.mgr_height_start	=	26,
 	.mgr_width_max		=	2048,
 	.mgr_height_max		=	2048,
+	.ovl_width_max		=	2048,
+	.ovl_height_max		=	2048,
 	.max_lcd_pclk		=	170000000,
 	.max_tv_pclk		=	185625000,
 	.max_downscale		=	4,
@@ -4457,6 +4477,8 @@ static const struct dispc_features omap54xx_dispc_feats = {
 	.mgr_height_start	=	27,
 	.mgr_width_max		=	4096,
 	.mgr_height_max		=	4096,
+	.ovl_width_max		=	2048,
+	.ovl_height_max		=	4096,
 	.max_lcd_pclk		=	170000000,
 	.max_tv_pclk		=	192000000,
 	.max_downscale		=	4,

drivers/gpu/drm/omapdrm/dss/dss.h

@@ -397,6 +397,8 @@ int dispc_get_num_mgrs(struct dispc_device *dispc);
 const u32 *dispc_ovl_get_color_modes(struct dispc_device *dispc,
 					    enum omap_plane_id plane);
 
+void dispc_ovl_get_max_size(struct dispc_device *dispc, u16 *width, u16 *height);
+
 u32 dispc_read_irqstatus(struct dispc_device *dispc);
 void dispc_clear_irqstatus(struct dispc_device *dispc, u32 mask);
 void dispc_write_irqenable(struct dispc_device *dispc, u32 mask);

drivers/gpu/drm/omapdrm/omap_plane.c

@@ -111,12 +111,19 @@ static int omap_plane_atomic_check(struct drm_plane *plane,
 {
 	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
 										 plane);
+	struct omap_drm_private *priv = plane->dev->dev_private;
 	struct drm_crtc_state *crtc_state;
+	u32 max_width, max_height;
+	u16 width, height;
 	int ret;
 
 	if (!new_plane_state->fb)
 		return 0;
 
+	dispc_ovl_get_max_size(priv->dispc, &width, &height);
+	max_width = width << 16;
+	max_height = height << 16;
+
 	/* crtc should only be NULL when disabling (i.e., !new_plane_state->fb) */
 	if (WARN_ON(!new_plane_state->crtc))
 		return 0;
@@ -151,6 +158,13 @@ static int omap_plane_atomic_check(struct drm_plane *plane,
 	if (new_plane_state->crtc_y + new_plane_state->crtc_h > crtc_state->adjusted_mode.vdisplay)
 		return -EINVAL;
 
+	/* Make sure dimensions are within bounds. */
+	if (new_plane_state->src_h > max_height || new_plane_state->crtc_h > height)
+		return -EINVAL;
+
+	if (new_plane_state->src_w > max_width || new_plane_state->crtc_w > width)
+		return -EINVAL;
+
 	if (new_plane_state->rotation != DRM_MODE_ROTATE_0 &&
 	    !omap_framebuffer_supports_rotation(new_plane_state->fb))
 		return -EINVAL;