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FROMLIST: drm: Pass CRTC ID in userspace vblank events

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With the atomic API, it is possible that a single commit affects
multiple crtcs. If the user requests an event with that commit, one
event will be sent for each CRTC, but it is not possible to distinguish
which crtc an event is for in user space. To solve this, the reserved
field in struct drm_vblank_event is repurposed to include the crtc_id
which the event is for.

The DRM_CAP_CRTC_IN_VBLANK_EVENT is added to allow userspace to query if
the crtc field will be set properly.

[daniels: Rebased, using Maarten's forward-port.]

Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Signed-off-by: Daniel Stone <daniels@collabora.com>
Cc: Maarten Lankhorst <maarten.lankhorst@intel.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
(am from https://patchwork.kernel.org/patch/9662099/)

Change-Id: Ibe6949782e5df5363d4eaa3e98b3ff413239cf26
Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>
This commit is contained in:
Ander Conselvan de Oliveira 2017-04-04 17:52:21 +01:00 committed by Huang, Tao
parent e469f94ad8
commit 398e38d802
2 changed files with 4 additions and 0 deletions
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3
drivers/gpu/drm/drm_ioctl.c
View File

@ -312,6 +312,9 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_
case DRM_CAP_ADDFB2_MODIFIERS:
req->value = dev->mode_config.allow_fb_modifiers;
break;
case DRM_CAP_CRTC_IN_VBLANK_EVENT:
req->value = 1;
break;
default:
return -EINVAL;
}

1
include/uapi/drm/drm.h
View File

@ -631,6 +631,7 @@ struct drm_gem_open {
#define DRM_CAP_CURSOR_WIDTH 0x8
#define DRM_CAP_CURSOR_HEIGHT 0x9
#define DRM_CAP_ADDFB2_MODIFIERS 0x10
#define DRM_CAP_CRTC_IN_VBLANK_EVENT 0x12
/** DRM_IOCTL_GET_CAP ioctl argument type */
struct drm_get_cap {