drm: Advertise async page flip ability through GETCAP ioctl

Let applications know whether the kernel supports asynchronous page
flipping.

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Dave Airlie <airlied@gmail.com>

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 4f35be732b831948aa289eaaae3b9e91aa0b687b..452591b67996917b7e86af11034a48eda34b8003 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3508,6 +3508,9 @@ 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 cffc7c0e1171cdc5c2dc968c332f33a0891c1378..07247e2855a23f7d9b530f6383a68f0c64663a0c 100644 (file)
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -293,6 +293,9 @@ 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 0c7fec5b8fef07d681536fa68fd63e01f3f9bb50..78ca1512c73fd9457ec1ab97972f454b55c0edef 100644 (file)
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -842,6 +842,9 @@ 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 272580ca320f1c6755306d36e503de32d44572b0..ece867889cc789ef3d6a467e535723911ac5d1d4 100644 (file)
--- 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