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[02/15] drm/atomic: Reject attempts to use multiple rotation angles at once

Message ID 1474907460-10717-3-git-send-email-ville.syrjala@linux.intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ville Syrjälä Sept. 26, 2016, 4:30 p.m. UTC 
From: Ville Syrjälä <ville.syrjala@linux.intel.com>

The rotation property should only accept exactly one rotation angle
at once. Let's reject attempts to set none or multiple angles.

Testcase: igt/kms_rotation_crc/bad-rotation
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/drm_atomic.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 23739609427d..58b90c247153 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -710,6 +710,8 @@  int drm_atomic_plane_set_property(struct drm_plane *plane,
 	} else if (property == config->prop_src_h) {
 		state->src_h = val;
 	} else if (property == config->rotation_property) {
+		if (!is_power_of_2(val & DRM_ROTATE_MASK))
+			return -EINVAL;
 		state->rotation = val;
 	} else if (property == plane->zpos_property) {
 		state->zpos = val;