Let applications know whether the kernel supports asynchronous page
flipping.
Signed-off-by: Keith Packard <kei...@keithp.com>
---
drivers/gpu/drm/drm_crtc.c | 3 +++
drivers/gpu/drm/drm_ioctl.c | 3 +++
include/drm/drm_crtc.h | 3 +++
include/uapi/drm/drm.h | 1 +
4 files changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 989072c..0909af6 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3514,6 +3514,9 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
page_flip->reserved != 0)
return -EINVAL;
+ if ((page_flip->flags & DRM_MODE_PAGE_FLIP_ASYNC) &&
!dev->mode_config.async_page_flip)
+ return -EINVAL;
+
obj = drm_mode_object_find(dev, page_flip->crtc_id,
DRM_MODE_OBJECT_CRTC);
if (!obj)
return -EINVAL;
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index ffd7a7b..7602177 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -303,6 +303,9 @@ int drm_getcap(struct drm_device *dev, void *data, struct
drm_file *file_priv)
case DRM_CAP_TIMESTAMP_MONOTONIC:
req->value = drm_timestamp_monotonic;
break;
+ case DRM_CAP_ASYNC_PAGE_FLIP:
+ req->value = dev->mode_config.async_page_flip;
+ break;
default:
return -EINVAL;
}
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 0820ab6..13d215f 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -845,6 +845,9 @@ struct drm_mode_config {
/* dumb ioctl parameters */
uint32_t preferred_depth, prefer_shadow;
+
+ /* whether async page flip is supported or not */
+ bool async_page_flip;
};
#define obj_to_crtc(x) container_of(x, struct drm_crtc, base)
diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index 238a166..2adfaa5 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -780,6 +780,7 @@ struct drm_event_vblank {
#define DRM_CAP_DUMB_PREFER_SHADOW 0x4
#define DRM_CAP_PRIME 0x5
#define DRM_CAP_TIMESTAMP_MONOTONIC 0x6
+#define DRM_CAP_ASYNC_PAGE_FLIP 0x7
#define DRM_PRIME_CAP_IMPORT 0x1
#define DRM_PRIME_CAP_EXPORT 0x2
--
1.8.3.2
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