From: Michel D?nzer <michel.daen...@amd.com>
This is another line of defence against the panic fixed by the previous
change, and should make the life cycle of a page flip clearer.
Tested-by: Dieter N?tzel <Dieter at nuetzel-hh.de>
Signed-off-by: Michel D?nzer <michel.daenzer at amd.com>
---
drivers/gpu/drm/radeon/radeon_display.c | 19 ++++++++++++++-----
drivers/gpu/drm/radeon/radeon_mode.h | 7 +++++++
2 files changed, 21 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_display.c
b/drivers/gpu/drm/radeon/radeon_display.c
index 8b575a4..65882cd 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -284,7 +284,6 @@ static void radeon_unpin_work_func(struct work_struct
*__work)
void radeon_crtc_handle_vblank(struct radeon_device *rdev, int crtc_id)
{
struct radeon_crtc *radeon_crtc = rdev->mode_info.crtcs[crtc_id];
- struct radeon_flip_work *work;
unsigned long flags;
u32 update_pending;
int vpos, hpos;
@@ -294,8 +293,11 @@ void radeon_crtc_handle_vblank(struct radeon_device *rdev,
int crtc_id)
return;
spin_lock_irqsave(&rdev->ddev->event_lock, flags);
- work = radeon_crtc->flip_work;
- if (work == NULL) {
+ if (radeon_crtc->flip_status != RADEON_FLIP_SUBMITTED) {
+ DRM_DEBUG_DRIVER("radeon_crtc->flip_status = %d != "
+ "RADEON_FLIP_SUBMITTED(%d)\n",
+ radeon_crtc->flip_status,
+ RADEON_FLIP_SUBMITTED);
spin_unlock_irqrestore(&rdev->ddev->event_lock, flags);
return;
}
@@ -343,12 +345,17 @@ void radeon_crtc_handle_flip(struct radeon_device *rdev,
int crtc_id)
spin_lock_irqsave(&rdev->ddev->event_lock, flags);
work = radeon_crtc->flip_work;
- if (work == NULL) {
+ if (radeon_crtc->flip_status != RADEON_FLIP_SUBMITTED) {
+ DRM_DEBUG_DRIVER("radeon_crtc->flip_status = %d != "
+ "RADEON_FLIP_SUBMITTED(%d)\n",
+ radeon_crtc->flip_status,
+ RADEON_FLIP_SUBMITTED);
spin_unlock_irqrestore(&rdev->ddev->event_lock, flags);
return;
}
/* Pageflip completed. Clean up. */
+ radeon_crtc->flip_status = RADEON_FLIP_NONE;
radeon_crtc->flip_work = NULL;
/* wakeup userspace */
@@ -475,6 +482,7 @@ static void radeon_flip_work_func(struct work_struct
*__work)
/* do the flip (mmio) */
radeon_page_flip(rdev, radeon_crtc->crtc_id, base);
+ radeon_crtc->flip_status = RADEON_FLIP_SUBMITTED;
spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
up_read(&rdev->exclusive_lock);
@@ -543,7 +551,7 @@ static int radeon_crtc_page_flip(struct drm_crtc *crtc,
/* We borrow the event spin lock for protecting flip_work */
spin_lock_irqsave(&crtc->dev->event_lock, flags);
- if (radeon_crtc->flip_work) {
+ if (radeon_crtc->flip_status != RADEON_FLIP_NONE) {
DRM_DEBUG_DRIVER("flip queue: crtc already busy\n");
spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
drm_gem_object_unreference_unlocked(&work->old_rbo->gem_base);
@@ -551,6 +559,7 @@ static int radeon_crtc_page_flip(struct drm_crtc *crtc,
kfree(work);
return -EBUSY;
}
+ radeon_crtc->flip_status = RADEON_FLIP_PENDING;
radeon_crtc->flip_work = work;
/* update crtc fb */
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h
b/drivers/gpu/drm/radeon/radeon_mode.h
index b59096f..ed6b6e0 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -301,6 +301,12 @@ struct radeon_atom_ss {
uint16_t amount;
};
+enum radeon_flip_status {
+ RADEON_FLIP_NONE,
+ RADEON_FLIP_PENDING,
+ RADEON_FLIP_SUBMITTED
+};
+
struct radeon_crtc {
struct drm_crtc base;
int crtc_id;
@@ -326,6 +332,7 @@ struct radeon_crtc {
/* page flipping */
struct workqueue_struct *flip_queue;
struct radeon_flip_work *flip_work;
+ enum radeon_flip_status flip_status;
/* pll sharing */
struct radeon_atom_ss ss;
bool ss_enabled;
--
2.0.0
