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drm/kms/radeon: Add support for precise vblank timestamping.

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This patch adds new functions for use by the drm core:

.get_vblank_timestamp() provides a precise timestamp
for the end of the most recent (or current) vblank
interval of a given crtc, as needed for the DRI2
implementation of the OML_sync_control extension.

It is a thin wrapper around the drm function
drm_calc_vbltimestamp_from_scanoutpos() which does
almost all the work and is shared across drivers.

.get_scanout_position() provides the current horizontal
and vertical video scanout position and "in vblank"
status of a given crtc, as needed by the drm for use by
drm_calc_vbltimestamp_from_scanoutpos().

The function is also used by the dynamic gpu reclocking
code to determine when it is safe to reclock inside vblank.

For that purpose radeon_pm_in_vbl() is modified to
accomodate a small change in the function prototype of
the radeon_get_crtc_scanoutpos() which is hooked up to
.get_scanout_position().

This code has been tested on AVIVO hardware, a RV530
(ATI Mobility Radeon X1600) in a Intel Core-2 Duo MacBookPro
and some R600 variant (FireGL V7600) in a single cpu
AMD Athlon 64 PC.

Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Mario Kleiner
2010-10-23 04:42:17 +02:00
committed by Dave Airlie
parent 27641c3f00
commit f5a8020903
5 changed files with 55 additions and 27 deletions
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7
drivers/gpu/drm/radeon/radeon_mode.h
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@@ -442,10 +442,6 @@ struct radeon_framebuffer {
struct drm_gem_object *obj;
};
/* radeon_get_crtc_scanoutpos() return flags */
#define RADEON_SCANOUTPOS_VALID (1 << 0)
#define RADEON_SCANOUTPOS_INVBL (1 << 1)
#define RADEON_SCANOUTPOS_ACCURATE (1 << 2)
extern enum radeon_tv_std
radeon_combios_get_tv_info(struct radeon_device *rdev);
@@ -562,7 +558,8 @@ extern int radeon_crtc_cursor_set(struct drm_crtc *crtc,
extern int radeon_crtc_cursor_move(struct drm_crtc *crtc,
int x, int y);
extern int radeon_get_crtc_scanoutpos(struct radeon_device *rdev, int crtc, int *vpos, int *hpos);
extern int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc,
int *vpos, int *hpos);
extern bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev);
extern struct edid *