Re: [RFC PATCH 2/3] drm: Adjust atomic checks for solid fill color

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On 29/10/2022 01:59, Jessica Zhang wrote:
Loosen the requirements for atomic and legacy commit so that, in cases
where solid fill planes is enabled (and FB_ID is NULL), the commit can
still go through.

In addition, add framebuffer NULL checks in other areas to account for
FB being NULL when solid fill is enabled.

Signed-off-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
---
  drivers/gpu/drm/drm_atomic.c        | 68 ++++++++++++++++-------------
  drivers/gpu/drm/drm_atomic_helper.c | 34 +++++++++------
  drivers/gpu/drm/drm_plane.c         |  8 ++--
  include/drm/drm_atomic_helper.h     |  5 ++-
  4 files changed, 64 insertions(+), 51 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index f197f59f6d99..b576ed221431 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -601,8 +601,10 @@ static int drm_atomic_plane_check(const struct drm_plane_state *old_plane_state,
  	uint32_t num_clips;
  	int ret;
- /* either *both* CRTC and FB must be set, or neither */
-	if (crtc && !fb) {
+	/* When color_fill is disabled,
+	 * either *both* CRTC and FB must be set, or neither
+	 */
+	if (crtc && !fb && !new_plane_state->color_fill) {

Using !color_fill sounds bad. It would disallow using black as the plane fill color. I think, you need to check color_fill_format instead.

  		drm_dbg_atomic(plane->dev, "[PLANE:%d:%s] CRTC set but no FB\n",
  			       plane->base.id, plane->name);
  		return -EINVAL;
@@ -626,14 +628,16 @@ static int drm_atomic_plane_check(const struct drm_plane_state *old_plane_state,
  	}


Don't we need to check that the color_fill_format is supported too?

/* Check whether this plane supports the fb pixel format. */
-	ret = drm_plane_check_pixel_format(plane, fb->format->format,
-					   fb->modifier);
-	if (ret) {
-		drm_dbg_atomic(plane->dev,
-			       "[PLANE:%d:%s] invalid pixel format %p4cc, modifier 0x%llx\n",
-			       plane->base.id, plane->name,
-			       &fb->format->format, fb->modifier);
-		return ret;
+	if (fb) {
+		ret = drm_plane_check_pixel_format(plane, fb->format->format,
+						   fb->modifier);
+
+		if (ret)
+			drm_dbg_atomic(plane->dev,
+				       "[PLANE:%d:%s] invalid pixel format %p4cc, modifier 0x%llx\n",
+				       plane->base.id, plane->name,
+				       &fb->format->format, fb->modifier);
+			return ret;
  	}
/* Give drivers some help against integer overflows */
@@ -649,28 +653,30 @@ static int drm_atomic_plane_check(const struct drm_plane_state *old_plane_state,
  		return -ERANGE;
  	}
- fb_width = fb->width << 16;
-	fb_height = fb->height << 16;
+	if (fb) {
+		fb_width = fb->width << 16;
+		fb_height = fb->height << 16;
- /* Make sure source coordinates are inside the fb. */
-	if (new_plane_state->src_w > fb_width ||
-	    new_plane_state->src_x > fb_width - new_plane_state->src_w ||
-	    new_plane_state->src_h > fb_height ||
-	    new_plane_state->src_y > fb_height - new_plane_state->src_h) {
-		drm_dbg_atomic(plane->dev,
-			       "[PLANE:%d:%s] invalid source coordinates "
-			       "%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
-			       plane->base.id, plane->name,
-			       new_plane_state->src_w >> 16,
-			       ((new_plane_state->src_w & 0xffff) * 15625) >> 10,
-			       new_plane_state->src_h >> 16,
-			       ((new_plane_state->src_h & 0xffff) * 15625) >> 10,
-			       new_plane_state->src_x >> 16,
-			       ((new_plane_state->src_x & 0xffff) * 15625) >> 10,
-			       new_plane_state->src_y >> 16,
-			       ((new_plane_state->src_y & 0xffff) * 15625) >> 10,
-			       fb->width, fb->height);
-		return -ENOSPC;
+		/* Make sure source coordinates are inside the fb. */
+		if (new_plane_state->src_w > fb_width ||
+		    new_plane_state->src_x > fb_width - new_plane_state->src_w ||
+		    new_plane_state->src_h > fb_height ||
+		    new_plane_state->src_y > fb_height - new_plane_state->src_h) {
+			drm_dbg_atomic(plane->dev,
+				       "[PLANE:%d:%s] invalid source coordinates "
+				       "%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
+				       plane->base.id, plane->name,
+				       new_plane_state->src_w >> 16,
+				       ((new_plane_state->src_w & 0xffff) * 15625) >> 10,
+				       new_plane_state->src_h >> 16,
+				       ((new_plane_state->src_h & 0xffff) * 15625) >> 10,
+				       new_plane_state->src_x >> 16,
+				       ((new_plane_state->src_x & 0xffff) * 15625) >> 10,
+				       new_plane_state->src_y >> 16,
+				       ((new_plane_state->src_y & 0xffff) * 15625) >> 10,
+				       fb->width, fb->height);
+			return -ENOSPC;
+		}
  	}
clips = __drm_plane_get_damage_clips(new_plane_state);
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 8bf41aa24068..5a5ffa06b8bd 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -818,7 +818,7 @@ int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
  	*src = drm_plane_state_src(plane_state);
  	*dst = drm_plane_state_dest(plane_state);
- if (!fb) {
+	if (!fb && !plane_state->color_fill) {
  		plane_state->visible = false;
  		return 0;
  	}
@@ -835,25 +835,31 @@ int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
  		return -EINVAL;
  	}
- drm_rect_rotate(src, fb->width << 16, fb->height << 16, rotation);
+	if (fb) {
+		drm_rect_rotate(src, fb->width << 16, fb->height << 16, rotation);
- /* Check scaling */
-	hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
-	vscale = drm_rect_calc_vscale(src, dst, min_scale, max_scale);
-	if (hscale < 0 || vscale < 0) {
-		drm_dbg_kms(plane_state->plane->dev,
-			    "Invalid scaling of plane\n");
-		drm_rect_debug_print("src: ", &plane_state->src, true);
-		drm_rect_debug_print("dst: ", &plane_state->dst, false);
-		return -ERANGE;
+		/* Check scaling */
+		hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
+		vscale = drm_rect_calc_vscale(src, dst, min_scale, max_scale);
+
+		if (hscale < 0 || vscale < 0) {
+			drm_dbg_kms(plane_state->plane->dev,
+			    	"Invalid scaling of plane\n");
+			drm_rect_debug_print("src: ", &plane_state->src, true);
+			drm_rect_debug_print("dst: ", &plane_state->dst, false);
+			return -ERANGE;
+		}
  	}
if (crtc_state->enable)
  		drm_mode_get_hv_timing(&crtc_state->mode, &clip.x2, &clip.y2);
- plane_state->visible = drm_rect_clip_scaled(src, dst, &clip);
-
-	drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16, rotation);
+	if (fb) {
+		plane_state->visible = drm_rect_clip_scaled(src, dst, &clip);
+		drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16, rotation);
+	} else if (plane_state->color_fill) {
+		plane_state->visible = true;
+	}
if (!plane_state->visible)
  		/*
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 726f2f163c26..223b5ed93d3a 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -850,8 +850,8 @@ static int __setplane_internal(struct drm_plane *plane,
WARN_ON(drm_drv_uses_atomic_modeset(plane->dev)); - /* No fb means shut it down */
-	if (!fb) {
+	/* No fb and no color fill means shut it down */
+	if (!fb && (plane->state && !plane->state->color_fill)) {

I'd suggest abstracting this to a helper function, which can then be used in drm_atomic_plane_check() too.

  		plane->old_fb = plane->fb;
  		ret = plane->funcs->disable_plane(plane, ctx);
  		if (!ret) {
@@ -902,8 +902,8 @@ static int __setplane_atomic(struct drm_plane *plane,
WARN_ON(!drm_drv_uses_atomic_modeset(plane->dev)); - /* No fb means shut it down */
-	if (!fb)
+	/* No fb and no color fill means shut it down */
+	if (!fb && (plane->state && !plane->state->color_fill))
  		return plane->funcs->disable_plane(plane, ctx);
/*
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index 2a0b17842402..aa7576f0879d 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -219,8 +219,9 @@ drm_atomic_plane_disabling(struct drm_plane_state *old_plane_state,
  	 * Anything else should be considered a bug in the atomic core, so we
  	 * gently warn about it.
  	 */
-	WARN_ON((new_plane_state->crtc == NULL && new_plane_state->fb != NULL) ||
-		(new_plane_state->crtc != NULL && new_plane_state->fb == NULL));
+	WARN_ON(!new_plane_state->color_fill &&
+			((new_plane_state->crtc == NULL && new_plane_state->fb != NULL) ||
+			(new_plane_state->crtc != NULL && new_plane_state->fb == NULL)));

Please fix the indentation.

return old_plane_state->crtc && !new_plane_state->crtc;
  }

--
With best wishes
Dmitry




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