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drm/kernel: vblank wait on crtc > 1 

Below is a patch against drm-next branch of 2.6.38-rc8+ kernel that adds
the capability to wait on vblank events for CRTCs that are greater than 1
and thus cannot be represented with primary/secondary flags in the legacy
interface. It was discussed on the dri-devel list in these two threads:

http://lists.freedesktop.org/archives/dri-devel/2011-March/009009.html
http://lists.freedesktop.org/archives/dri-devel/2011-March/009025.html

This patch extends the interface to drm_wait_vblank ioctl so that crtc>1
can be represented. It also adds a new capability to drm_getcap ioctl so
that the user space can check whether the new interface to drm_wait_vblank
is supported (and fall back to the legacy interface if not)

Signed-off-by: Ilija Hadzic <ihadzic@research.bell-labs.com>
Reviewed-by: Mario Kleiner <mario.kleiner at tuebingen.mpg.de>
Acked-by: Mario Kleiner <mario.kleiner at tuebingen.mpg.de>
Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
Tested-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Ilija Hadzic 2011-03-18 16:58:04 -05:00 committed by Dave Airlie
parent b74ad5ae14
commit 19b01b5fbf
3 changed files with 16 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/drm_ioctl.c
View File

@ -280,6 +280,9 @@ int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
if (dev->driver->dumb_create) if (dev->driver->dumb_create)
req->value = 1; req->value = 1;
break; break;
case DRM_CAP_HIGH_CRTC:
req->value = 1;
break;
default: default:
return -EINVAL; return -EINVAL;
} }

15
drivers/gpu/drm/drm_irq.c
View File

@ -1125,7 +1125,7 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
{ {
union drm_wait_vblank *vblwait = data; union drm_wait_vblank *vblwait = data;
int ret = 0; int ret = 0;
unsigned int flags, seq, crtc; unsigned int flags, seq, crtc, high_crtc;
if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled)) if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled))
return -EINVAL; return -EINVAL;
@ -1134,16 +1134,21 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
return -EINVAL; return -EINVAL;
if (vblwait->request.type & if (vblwait->request.type &
~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)) { ~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
_DRM_VBLANK_HIGH_CRTC_MASK)) {
DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n", DRM_ERROR("Unsupported type value 0x%x, supported mask 0x%x\n",
vblwait->request.type, vblwait->request.type,
(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK)); (_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
_DRM_VBLANK_HIGH_CRTC_MASK));
return -EINVAL; return -EINVAL;
} }
flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; high_crtc = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK);
if (high_crtc)
crtc = high_crtc >> _DRM_VBLANK_HIGH_CRTC_SHIFT;
else
crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
if (crtc >= dev->num_crtcs) if (crtc >= dev->num_crtcs)
return -EINVAL; return -EINVAL;

3
include/drm/drm.h
View File

@ -469,6 +469,8 @@ enum drm_vblank_seq_type {
_DRM_VBLANK_SECONDARY = 0x20000000, /**< Secondary display controller */ _DRM_VBLANK_SECONDARY = 0x20000000, /**< Secondary display controller */
_DRM_VBLANK_SIGNAL = 0x40000000 /**< Send signal instead of blocking, unsupported */ _DRM_VBLANK_SIGNAL = 0x40000000 /**< Send signal instead of blocking, unsupported */
}; };
#define _DRM_VBLANK_HIGH_CRTC_SHIFT 16
#define _DRM_VBLANK_HIGH_CRTC_MASK 0x001F0000
#define _DRM_VBLANK_TYPES_MASK (_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE) #define _DRM_VBLANK_TYPES_MASK (_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE)
#define _DRM_VBLANK_FLAGS_MASK (_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | \ #define _DRM_VBLANK_FLAGS_MASK (_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | \
@ -753,6 +755,7 @@ struct drm_event_vblank {
}; };
#define DRM_CAP_DUMB_BUFFER 0x1 #define DRM_CAP_DUMB_BUFFER 0x1
#define DRM_CAP_HIGH_CRTC 0x2
/* typedef area */ /* typedef area */
#ifndef __KERNEL__ #ifndef __KERNEL__