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authorLiviu Dudau <Liviu.Dudau@arm.com>2018-03-01 16:38:02 +0000
committerLiviu Dudau <Liviu.Dudau@arm.com>2018-03-14 11:38:02 +0000
commitd862b2d622530d14072f3ae417a0525fb7361410 (patch)
tree6ce41110c918b40d2cfab3ee41310c126d14f6ad /drivers/gpu/drm/arm/malidp_drv.c
parentf0437819ad82088d4a07732222912345b5b98767 (diff)
drm/mali-dp: Fix malidp_atomic_commit_hw_done() for event sending.
Mali DP hardware has a 'go' bit (config_valid) for making the new scene parameters active at the next page flip. The problem with the current code is that the driver first sets this bit and then proceeds to wait for confirmation from the hardware that the configuration has been updated before arming the vblank event. As config_valid is actually asserted by the hardware after the vblank event, during the prefetch phase, when we get to arming the vblank event we are going to send it at the next vblank, in effect halving the vblank rate from the userspace perspective. Fix it by sending the userspace event from the IRQ handler, when we handle the config_valid interrupt, which syncs with the time when the hardware is active with the new parameters. Reported-by: Alexandru-Cosmin Gheorghe <alexandru-cosmin.gheorghe@arm.com> Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Diffstat (limited to 'drivers/gpu/drm/arm/malidp_drv.c')
-rw-r--r--drivers/gpu/drm/arm/malidp_drv.c32
1 files changed, 17 insertions, 15 deletions
diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
index d88a3b9d59cc..3c628e43bf25 100644
--- a/drivers/gpu/drm/arm/malidp_drv.c
+++ b/drivers/gpu/drm/arm/malidp_drv.c
@@ -185,25 +185,29 @@ static int malidp_set_and_wait_config_valid(struct drm_device *drm)
static void malidp_atomic_commit_hw_done(struct drm_atomic_state *state)
{
- struct drm_pending_vblank_event *event;
struct drm_device *drm = state->dev;
struct malidp_drm *malidp = drm->dev_private;
- if (malidp->crtc.enabled) {
- /* only set config_valid if the CRTC is enabled */
- if (malidp_set_and_wait_config_valid(drm))
- DRM_DEBUG_DRIVER("timed out waiting for updated configuration\n");
- }
+ malidp->event = malidp->crtc.state->event;
+ malidp->crtc.state->event = NULL;
- event = malidp->crtc.state->event;
- if (event) {
- malidp->crtc.state->event = NULL;
+ if (malidp->crtc.state->active) {
+ /*
+ * if we have an event to deliver to userspace, make sure
+ * the vblank is enabled as we are sending it from the IRQ
+ * handler.
+ */
+ if (malidp->event)
+ drm_crtc_vblank_get(&malidp->crtc);
+ /* only set config_valid if the CRTC is enabled */
+ if (malidp_set_and_wait_config_valid(drm) < 0)
+ DRM_DEBUG_DRIVER("timed out waiting for updated configuration\n");
+ } else if (malidp->event) {
+ /* CRTC inactive means vblank IRQ is disabled, send event directly */
spin_lock_irq(&drm->event_lock);
- if (drm_crtc_vblank_get(&malidp->crtc) == 0)
- drm_crtc_arm_vblank_event(&malidp->crtc, event);
- else
- drm_crtc_send_vblank_event(&malidp->crtc, event);
+ drm_crtc_send_vblank_event(&malidp->crtc, malidp->event);
+ malidp->event = NULL;
spin_unlock_irq(&drm->event_lock);
}
drm_atomic_helper_commit_hw_done(state);
@@ -232,8 +236,6 @@ static void malidp_atomic_commit_tail(struct drm_atomic_state *state)
malidp_atomic_commit_hw_done(state);
- drm_atomic_helper_wait_for_vblanks(drm, state);
-
pm_runtime_put(drm->dev);
drm_atomic_helper_cleanup_planes(drm, state);