[PATCH 1/3] drm/omap: fix plane check when crtc is disabled

[PATCH 1/3] drm/omap: fix plane check when crtc is disabled

[Tomi Valkeinen]

I sometimes see:

[drm:drm_framebuffer_remove [drm]] *ERROR* failed to reset crtc ed2a6c00
when fb was deleted: -22

which comes from drm_framebuffer_remove() when it's disabling the crtc
with zeroed drm_mode_set.

The problem in omap_plane_atomic_check() is that it will use those
zeroed fields to verify if the setup is correct.

This patch makes omap_plane_atomic_check() return 0 if the crtc is
disabled.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 drivers/gpu/drm/omapdrm/omap_plane.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/omapdrm/omap_plane.c b/drivers/gpu/drm/omapdrm/omap_plane.c
index 5252ab720e70..85eab82f91bc 100644
--- a/drivers/gpu/drm/omapdrm/omap_plane.c
+++ b/drivers/gpu/drm/omapdrm/omap_plane.c
@@ -168,6 +168,9 @@ static int omap_plane_atomic_check(struct drm_plane *plane,
 	if (IS_ERR(crtc_state))
 		return PTR_ERR(crtc_state);
 
+	if (!crtc_state->enable)
+		return 0;
+
 	if (state->crtc_x < 0 || state->crtc_y < 0)
 		return -EINVAL;
 
-- 
2.5.0

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[PATCH 2/3] drm/omap: cleanup omap_plane_atomic_check()

[Tomi Valkeinen]

Clean up omap_plane_atomic_check() with:

- Check state->fb first. If no fb, return 0.
- use drm_atomic_get_existing_crtc_state() instead of
  drm_atomic_get_crtc_state()

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 drivers/gpu/drm/omapdrm/omap_plane.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/omap_plane.c b/drivers/gpu/drm/omapdrm/omap_plane.c
index 85eab82f91bc..5664200ef05b 100644
--- a/drivers/gpu/drm/omapdrm/omap_plane.c
+++ b/drivers/gpu/drm/omapdrm/omap_plane.c
@@ -161,12 +161,17 @@ static int omap_plane_atomic_check(struct drm_plane *plane,
 {
 	struct drm_crtc_state *crtc_state;
 
-	if (!state->crtc)
+	if (!state->fb)
 		return 0;
 
-	crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
-	if (IS_ERR(crtc_state))
-		return PTR_ERR(crtc_state);
+	/* crtc should only be NULL when disabling (i.e., !state->fb) */
+	if (WARN_ON(!state->crtc))
+		return 0;
+
+	crtc_state = drm_atomic_get_existing_crtc_state(state->state, state->crtc);
+	/* we should have a crtc state if the plane is attached to a crtc */
+	if (WARN_ON(!crtc_state))
+		return 0;
 
 	if (!crtc_state->enable)
 		return 0;
@@ -180,11 +185,9 @@ static int omap_plane_atomic_check(struct drm_plane *plane,
 	if (state->crtc_y + state->crtc_h > crtc_state->adjusted_mode.vdisplay)
 		return -EINVAL;
 
-	if (state->fb) {
-		if (state->rotation != BIT(DRM_ROTATE_0) &&
-		    !omap_framebuffer_supports_rotation(state->fb))
-			return -EINVAL;
-	}
+	if (state->rotation != BIT(DRM_ROTATE_0) &&
+	    !omap_framebuffer_supports_rotation(state->fb))
+		return -EINVAL;
 
 	return 0;
 }
-- 
2.5.0

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[PATCH 3/3] drm/omap: print error instead of WARN() if plane setup fails

[Tomi Valkeinen]

omap_plane_atomic_update() does WARN_ON() if dispc rejects the given
plane config. Change that to dev_err() to lessen the possible spam.

To fix this correctly, the plane setup needs much more work by creating
a check function for dispc setup, so that we could reliably check the
config in atomic_check, instead of only noticing the problem when
programming dispc.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 drivers/gpu/drm/omapdrm/omap_plane.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/omapdrm/omap_plane.c b/drivers/gpu/drm/omapdrm/omap_plane.c
index 5664200ef05b..4f39855d80fe 100644
--- a/drivers/gpu/drm/omapdrm/omap_plane.c
+++ b/drivers/gpu/drm/omapdrm/omap_plane.c
@@ -135,7 +135,9 @@ static void omap_plane_atomic_update(struct drm_plane *plane,
 	/* and finally, update omapdss: */
 	ret = dispc_ovl_setup(omap_plane->id, &info, false,
 			      omap_crtc_timings(state->crtc), false);
-	if (WARN_ON(ret)) {
+	if (ret) {
+		dev_err(plane->dev->dev, "Failed to setup plane %s\n",
+			omap_plane->name);
 		dispc_ovl_enable(omap_plane->id, false);
 		return;
 	}
-- 
2.5.0

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