From: Michel Dänzer michel.daenzer@amd.com
Now we can program a flip during a vertical blank period, if it's the one targeted by the flip (or a later one). This allows simplifying radeon_flip_work_func considerably.
Signed-off-by: Michel Dänzer michel.daenzer@amd.com --- drivers/gpu/drm/radeon/radeon.h | 1 + drivers/gpu/drm/radeon/radeon_display.c | 89 +++++++++------------------------ 2 files changed, 25 insertions(+), 65 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h index 5633ee3..1b0dcad 100644 --- a/drivers/gpu/drm/radeon/radeon.h +++ b/drivers/gpu/drm/radeon/radeon.h @@ -742,6 +742,7 @@ struct radeon_flip_work { struct work_struct unpin_work; struct radeon_device *rdev; int crtc_id; + u32 target_vblank; uint64_t base; struct drm_pending_vblank_event *event; struct radeon_bo *old_rbo; diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c index 5f1cd69..bd9d995 100644 --- a/drivers/gpu/drm/radeon/radeon_display.c +++ b/drivers/gpu/drm/radeon/radeon_display.c @@ -400,14 +400,13 @@ static void radeon_flip_work_func(struct work_struct *__work) struct radeon_flip_work *work = container_of(__work, struct radeon_flip_work, flip_work); struct radeon_device *rdev = work->rdev; + struct drm_device *dev = rdev->ddev; struct radeon_crtc *radeon_crtc = rdev->mode_info.crtcs[work->crtc_id];
struct drm_crtc *crtc = &radeon_crtc->base; unsigned long flags; int r; - int vpos, hpos, stat, min_udelay = 0; - unsigned repcnt = 4; - struct drm_vblank_crtc *vblank = &crtc->dev->vblank[work->crtc_id]; + int vpos, hpos;
down_read(&rdev->exclusive_lock); if (work->fence) { @@ -438,59 +437,25 @@ static void radeon_flip_work_func(struct work_struct *__work) work->fence = NULL; }
+ /* Wait until we're out of the vertical blank period before the one + * targeted by the flip + */ + while (radeon_crtc->enabled && + (radeon_get_crtc_scanoutpos(dev, work->crtc_id, 0, + &vpos, &hpos, NULL, NULL, + &crtc->hwmode) + & (DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_IN_VBLANK)) == + (DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_IN_VBLANK) && + (int)(work->target_vblank - + dev->driver->get_vblank_counter(dev, work->crtc_id)) > 0) + usleep_range(1000, 2000); + /* We borrow the event spin lock for protecting flip_status */ spin_lock_irqsave(&crtc->dev->event_lock, flags);
/* set the proper interrupt */ radeon_irq_kms_pflip_irq_get(rdev, radeon_crtc->crtc_id);
- /* If this happens to execute within the "virtually extended" vblank - * interval before the start of the real vblank interval then it needs - * to delay programming the mmio flip until the real vblank is entered. - * This prevents completing a flip too early due to the way we fudge - * our vblank counter and vblank timestamps in order to work around the - * problem that the hw fires vblank interrupts before actual start of - * vblank (when line buffer refilling is done for a frame). It - * complements the fudging logic in radeon_get_crtc_scanoutpos() for - * timestamping and radeon_get_vblank_counter_kms() for vblank counts. - * - * In practice this won't execute very often unless on very fast - * machines because the time window for this to happen is very small. - */ - while (radeon_crtc->enabled && --repcnt) { - /* GET_DISTANCE_TO_VBLANKSTART returns distance to real vblank - * start in hpos, and to the "fudged earlier" vblank start in - * vpos. - */ - stat = radeon_get_crtc_scanoutpos(rdev->ddev, work->crtc_id, - GET_DISTANCE_TO_VBLANKSTART, - &vpos, &hpos, NULL, NULL, - &crtc->hwmode); - - if ((stat & (DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE)) != - (DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE) || - !(vpos >= 0 && hpos <= 0)) - break; - - /* Sleep at least until estimated real start of hw vblank */ - min_udelay = (-hpos + 1) * max(vblank->linedur_ns / 1000, 5); - if (min_udelay > vblank->framedur_ns / 2000) { - /* Don't wait ridiculously long - something is wrong */ - repcnt = 0; - break; - } - spin_unlock_irqrestore(&crtc->dev->event_lock, flags); - usleep_range(min_udelay, 2 * min_udelay); - spin_lock_irqsave(&crtc->dev->event_lock, flags); - }; - - if (!repcnt) - DRM_DEBUG_DRIVER("Delay problem on crtc %d: min_udelay %d, " - "framedur %d, linedur %d, stat %d, vpos %d, " - "hpos %d\n", work->crtc_id, min_udelay, - vblank->framedur_ns / 1000, - vblank->linedur_ns / 1000, stat, vpos, hpos); - /* do the flip (mmio) */ radeon_page_flip(rdev, radeon_crtc->crtc_id, work->base, work->async);
@@ -499,10 +464,11 @@ static void radeon_flip_work_func(struct work_struct *__work) up_read(&rdev->exclusive_lock); }
-static int radeon_crtc_page_flip(struct drm_crtc *crtc, - struct drm_framebuffer *fb, - struct drm_pending_vblank_event *event, - uint32_t page_flip_flags) +static int radeon_crtc_page_flip_target(struct drm_crtc *crtc, + struct drm_framebuffer *fb, + struct drm_pending_vblank_event *event, + uint32_t page_flip_flags, + uint32_t target) { struct drm_device *dev = crtc->dev; struct radeon_device *rdev = dev->dev_private; @@ -599,12 +565,8 @@ static int radeon_crtc_page_flip(struct drm_crtc *crtc, base &= ~7; } work->base = base; - - r = drm_crtc_vblank_get(crtc); - if (r) { - DRM_ERROR("failed to get vblank before flip\n"); - goto pflip_cleanup; - } + work->target_vblank = target - drm_crtc_vblank_count(crtc) + + dev->driver->get_vblank_counter(dev, work->crtc_id);
/* We borrow the event spin lock for protecting flip_work */ spin_lock_irqsave(&crtc->dev->event_lock, flags); @@ -613,7 +575,7 @@ static int radeon_crtc_page_flip(struct drm_crtc *crtc, DRM_DEBUG_DRIVER("flip queue: crtc already busy\n"); spin_unlock_irqrestore(&crtc->dev->event_lock, flags); r = -EBUSY; - goto vblank_cleanup; + goto pflip_cleanup; } radeon_crtc->flip_status = RADEON_FLIP_PENDING; radeon_crtc->flip_work = work; @@ -626,9 +588,6 @@ static int radeon_crtc_page_flip(struct drm_crtc *crtc, queue_work(radeon_crtc->flip_queue, &work->flip_work); return 0;
-vblank_cleanup: - drm_crtc_vblank_put(crtc); - pflip_cleanup: if (unlikely(radeon_bo_reserve(new_rbo, false) != 0)) { DRM_ERROR("failed to reserve new rbo in error path\n"); @@ -697,7 +656,7 @@ static const struct drm_crtc_funcs radeon_crtc_funcs = { .gamma_set = radeon_crtc_gamma_set, .set_config = radeon_crtc_set_config, .destroy = radeon_crtc_destroy, - .page_flip = radeon_crtc_page_flip, + .page_flip_target = radeon_crtc_page_flip_target, };
static void radeon_crtc_init(struct drm_device *dev, int index)