The kernel shouldn't accept invalid modes, just say No.
Signed-off-by: Damien Lespiau <damien.lespiau@xxxxxxxxx>
---
drivers/gpu/drm/drm_crtc.c | 3 +++
include/drm/drm_crtc.h | 2 ++
include/uapi/drm/drm_mode.h | 4 ++++
3 files changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 2ce80ed..d7a8370 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1319,6 +1319,9 @@ static int drm_crtc_convert_umode(struct drm_display_mode *out,
if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
return -ERANGE;
+ if ((in->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
+ return -EINVAL;
+
out->clock = in->clock;
out->hdisplay = in->hdisplay;
out->hsync_start = in->hsync_start;
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index eb6b8dc..50cedad 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -128,6 +128,8 @@ enum drm_mode_status {
#define CRTC_INTERLACE_HALVE_V (1 << 0) /* halve V values for interlacing */
#define CRTC_STEREO_DOUBLE (1 << 1) /* adjust timings for stereo modes */
+#define DRM_MODE_FLAG_3D_MAX DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF
+
struct drm_display_mode {
/* Header */
struct list_head head;
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 7980f89..c2c4ace 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -58,6 +58,10 @@
#define DRM_MODE_FLAG_PIXMUX (1<<11)
#define DRM_MODE_FLAG_DBLCLK (1<<12)
#define DRM_MODE_FLAG_CLKDIV2 (1<<13)
+ /*
+ * When adding a new stereo mode don't forget to adjust DRM_MODE_FLAGS_3D_MAX
+ * (define not exposed to user space).
+ */
#define DRM_MODE_FLAG_3D_MASK (0x1f<<14)
#define DRM_MODE_FLAG_3D_NONE (0<<14)
#define DRM_MODE_FLAG_3D_FRAME_PACKING (1<<14)
--
1.8.3.1
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