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drm/amdgpu: Fix dead lock issue for vblank
Always start vblank timer, but only calls vblank function when vblank is enabled. This is used to fix the dead lock issue. When drm_crtc_vblank_off want to disable vblank, it first get event_lock, and then call hrtimer_cancel, but hrtimer_cancel want to wait timer handler function finished. Timer handler also want to aquire event_lock in drm_handle_vblank. Signed-off-by: Emily.Deng <Emily.Deng@amd.com> Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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9de9a54aba
commit
36499e4c77
1 changed files with 17 additions and 18 deletions
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@ -47,6 +47,9 @@ static void dce_virtual_set_display_funcs(struct amdgpu_device *adev);
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static void dce_virtual_set_irq_funcs(struct amdgpu_device *adev);
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static int dce_virtual_connector_encoder_init(struct amdgpu_device *adev,
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int index);
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static int dce_virtual_pageflip(struct amdgpu_device *adev,
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unsigned crtc_id);
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static enum hrtimer_restart dce_virtual_vblank_timer_handle(struct hrtimer *vblank_timer);
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static void dce_virtual_set_crtc_vblank_interrupt_state(struct amdgpu_device *adev,
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int crtc,
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enum amdgpu_interrupt_state state);
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@ -247,6 +250,11 @@ static int dce_virtual_crtc_init(struct amdgpu_device *adev, int index)
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amdgpu_crtc->vsync_timer_enabled = AMDGPU_IRQ_STATE_DISABLE;
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drm_crtc_helper_add(&amdgpu_crtc->base, &dce_virtual_crtc_helper_funcs);
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hrtimer_init(&amdgpu_crtc->vblank_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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hrtimer_set_expires(&amdgpu_crtc->vblank_timer, DCE_VIRTUAL_VBLANK_PERIOD);
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amdgpu_crtc->vblank_timer.function = dce_virtual_vblank_timer_handle;
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hrtimer_start(&amdgpu_crtc->vblank_timer,
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DCE_VIRTUAL_VBLANK_PERIOD, HRTIMER_MODE_REL);
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return 0;
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}
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@ -476,7 +484,7 @@ static int dce_virtual_hw_fini(void *handle)
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for (i = 0; i<adev->mode_info.num_crtc; i++)
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if (adev->mode_info.crtcs[i])
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dce_virtual_set_crtc_vblank_interrupt_state(adev, i, AMDGPU_IRQ_STATE_DISABLE);
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hrtimer_cancel(&adev->mode_info.crtcs[i]->vblank_timer);
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return 0;
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}
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@ -698,9 +706,15 @@ static enum hrtimer_restart dce_virtual_vblank_timer_handle(struct hrtimer *vbla
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struct amdgpu_crtc, vblank_timer);
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struct drm_device *ddev = amdgpu_crtc->base.dev;
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struct amdgpu_device *adev = drm_to_adev(ddev);
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struct amdgpu_irq_src *source = adev->irq.client[AMDGPU_IRQ_CLIENTID_LEGACY].sources
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[VISLANDS30_IV_SRCID_SMU_DISP_TIMER2_TRIGGER];
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int irq_type = amdgpu_display_crtc_idx_to_irq_type(adev,
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amdgpu_crtc->crtc_id);
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if (amdgpu_irq_enabled(adev, source, irq_type)) {
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drm_handle_vblank(ddev, amdgpu_crtc->crtc_id);
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dce_virtual_pageflip(adev, amdgpu_crtc->crtc_id);
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}
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hrtimer_start(vblank_timer, DCE_VIRTUAL_VBLANK_PERIOD,
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HRTIMER_MODE_REL);
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@ -716,21 +730,6 @@ static void dce_virtual_set_crtc_vblank_interrupt_state(struct amdgpu_device *ad
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return;
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}
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if (state && !adev->mode_info.crtcs[crtc]->vsync_timer_enabled) {
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DRM_DEBUG("Enable software vsync timer\n");
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hrtimer_init(&adev->mode_info.crtcs[crtc]->vblank_timer,
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CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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hrtimer_set_expires(&adev->mode_info.crtcs[crtc]->vblank_timer,
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DCE_VIRTUAL_VBLANK_PERIOD);
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adev->mode_info.crtcs[crtc]->vblank_timer.function =
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dce_virtual_vblank_timer_handle;
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hrtimer_start(&adev->mode_info.crtcs[crtc]->vblank_timer,
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DCE_VIRTUAL_VBLANK_PERIOD, HRTIMER_MODE_REL);
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} else if (!state && adev->mode_info.crtcs[crtc]->vsync_timer_enabled) {
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DRM_DEBUG("Disable software vsync timer\n");
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hrtimer_cancel(&adev->mode_info.crtcs[crtc]->vblank_timer);
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}
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adev->mode_info.crtcs[crtc]->vsync_timer_enabled = state;
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DRM_DEBUG("[FM]set crtc %d vblank interrupt state %d\n", crtc, state);
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}
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