Messages in this thread | | | Date | Tue, 8 Sep 2020 19:44:25 +0000 | From | abhinavk@codeauro ... | Subject | Re: [PATCH 2/2] drm/msm/dpu: clean up some impossibilities |
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On 2020-09-07 10:04, Rob Clark wrote: > From: Rob Clark <robdclark@chromium.org> > > Signed-off-by: Rob Clark <robdclark@chromium.org> > --- > drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 81 ++++-------------------- > 1 file changed, 12 insertions(+), 69 deletions(-) > > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c > b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c > index 89c0245b5de5..ad49b0e17fcb 100644 > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c > @@ -265,11 +265,6 @@ enum dpu_intf_mode dpu_crtc_get_intf_mode(struct > drm_crtc *crtc) > { > struct drm_encoder *encoder; > > - if (!crtc) { > - DPU_ERROR("invalid crtc\n"); > - return INTF_MODE_NONE; > - } > - > /* > * TODO: This function is called from dpu debugfs and as part of > atomic > * check. When called from debugfs, the crtc->mutex must be held to > @@ -500,12 +495,6 @@ static void dpu_crtc_atomic_begin(struct drm_crtc > *crtc, > struct dpu_crtc_state *cstate; > struct drm_encoder *encoder; > struct drm_device *dev; > - unsigned long flags; > - > - if (!crtc) { > - DPU_ERROR("invalid crtc\n"); > - return; > - } > > if (!crtc->state->enable) { > DPU_DEBUG("crtc%d -> enable %d, skip atomic_begin\n", > @@ -521,15 +510,6 @@ static void dpu_crtc_atomic_begin(struct drm_crtc > *crtc, > > _dpu_crtc_setup_lm_bounds(crtc, crtc->state); > > - if (dpu_crtc->event) { > - WARN_ON(dpu_crtc->event); > - } else { > - spin_lock_irqsave(&dev->event_lock, flags); > - dpu_crtc->event = crtc->state->event; > - crtc->state->event = NULL; > - spin_unlock_irqrestore(&dev->event_lock, flags); > - } > - > /* encoder will trigger pending mask now */ > drm_for_each_encoder_mask(encoder, crtc->dev, > crtc->state->encoder_mask) > dpu_encoder_trigger_kickoff_pending(encoder); > @@ -583,14 +563,11 @@ static void dpu_crtc_atomic_flush(struct drm_crtc > *crtc, > return; > } > > - if (dpu_crtc->event) { > - DPU_DEBUG("already received dpu_crtc->event\n"); > - } else { > - spin_lock_irqsave(&dev->event_lock, flags); > - dpu_crtc->event = crtc->state->event; > - crtc->state->event = NULL; > - spin_unlock_irqrestore(&dev->event_lock, flags); > - } > + WARN_ON(dpu_crtc->event); before the patch "move vblank events to complete_commit()", the dpu_crtc events were consumed in the _dpu_crtc_complete_flip(). So there was a chance that if the vblank event did not come in time before the next commit, dpu_crtc->event will not be consumed.
But after the patch, _dpu_crtc_complete_flip() is being signaled in dpu_crtc_complete_commit() which will always happen, so is there any case where we will hit this warning at all or will this catch some other condition?
> + spin_lock_irqsave(&dev->event_lock, flags); > + dpu_crtc->event = crtc->state->event; > + crtc->state->event = NULL; > + spin_unlock_irqrestore(&dev->event_lock, flags); > > /* > * If no mixers has been allocated in dpu_crtc_atomic_check(), > @@ -635,14 +612,7 @@ static void dpu_crtc_atomic_flush(struct drm_crtc > *crtc, > static void dpu_crtc_destroy_state(struct drm_crtc *crtc, > struct drm_crtc_state *state) > { > - struct dpu_crtc_state *cstate; > - > - if (!crtc || !state) { > - DPU_ERROR("invalid argument(s)\n"); > - return; > - } > - > - cstate = to_dpu_crtc_state(state); > + struct dpu_crtc_state *cstate = to_dpu_crtc_state(state); > > DPU_DEBUG("crtc%d\n", crtc->base.id); > > @@ -731,14 +701,8 @@ static void dpu_crtc_reset(struct drm_crtc *crtc) > */ > static struct drm_crtc_state *dpu_crtc_duplicate_state(struct drm_crtc > *crtc) > { > - struct dpu_crtc_state *cstate, *old_cstate; > - > - if (!crtc || !crtc->state) { > - DPU_ERROR("invalid argument(s)\n"); > - return NULL; > - } > + struct dpu_crtc_state *cstate, *old_cstate = > to_dpu_crtc_state(crtc->state); > > - old_cstate = to_dpu_crtc_state(crtc->state); > cstate = kmemdup(old_cstate, sizeof(*old_cstate), GFP_KERNEL); > if (!cstate) { > DPU_ERROR("failed to allocate state\n"); > @@ -754,19 +718,12 @@ static struct drm_crtc_state > *dpu_crtc_duplicate_state(struct drm_crtc *crtc) > static void dpu_crtc_disable(struct drm_crtc *crtc, > struct drm_crtc_state *old_crtc_state) > { > - struct dpu_crtc *dpu_crtc; > - struct dpu_crtc_state *cstate; > + struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc); > + struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc->state); > struct drm_encoder *encoder; > unsigned long flags; > bool release_bandwidth = false; > > - if (!crtc || !crtc->state) { > - DPU_ERROR("invalid crtc\n"); > - return; > - } > - dpu_crtc = to_dpu_crtc(crtc); > - cstate = to_dpu_crtc_state(crtc->state); > - > DRM_DEBUG_KMS("crtc%d\n", crtc->base.id); > > /* Disable/save vblank irq handling */ > @@ -825,19 +782,13 @@ static void dpu_crtc_disable(struct drm_crtc > *crtc, > static void dpu_crtc_enable(struct drm_crtc *crtc, > struct drm_crtc_state *old_crtc_state) > { > - struct dpu_crtc *dpu_crtc; > + struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc); > struct drm_encoder *encoder; > bool request_bandwidth = false; > > - if (!crtc) { > - DPU_ERROR("invalid crtc\n"); > - return; > - } > - > pm_runtime_get_sync(crtc->dev->dev); > > DRM_DEBUG_KMS("crtc%d\n", crtc->base.id); > - dpu_crtc = to_dpu_crtc(crtc); > > drm_for_each_encoder_mask(encoder, crtc->dev, > crtc->state->encoder_mask) { > /* in video mode, we hold an extra bandwidth reference > @@ -873,9 +824,9 @@ struct plane_state { > static int dpu_crtc_atomic_check(struct drm_crtc *crtc, > struct drm_crtc_state *state) > { > - struct dpu_crtc *dpu_crtc; > + struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc); > + struct dpu_crtc_state *cstate = to_dpu_crtc_state(state); > struct plane_state *pstates; > - struct dpu_crtc_state *cstate; > > const struct drm_plane_state *pstate; > struct drm_plane *plane; > @@ -889,16 +840,8 @@ static int dpu_crtc_atomic_check(struct drm_crtc > *crtc, > int left_zpos_cnt = 0, right_zpos_cnt = 0; > struct drm_rect crtc_rect = { 0 }; > > - if (!crtc) { > - DPU_ERROR("invalid crtc\n"); > - return -EINVAL; > - } > - > pstates = kzalloc(sizeof(*pstates) * DPU_STAGE_MAX * 4, GFP_KERNEL); > > - dpu_crtc = to_dpu_crtc(crtc); > - cstate = to_dpu_crtc_state(state); > - > if (!state->enable || !state->active) { > DPU_DEBUG("crtc%d -> enable %d, active %d, skip atomic_check\n", > crtc->base.id, state->enable, state->active);
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