mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-29 23:53:32 +00:00
Code Issues Releases Wiki Activity

drm/amdgpu: Fix dead lock issue for vblank

Browse source 
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>
This commit is contained in:
Emily.Deng 2020-09-14 17:57:01 +08:00 committed by Alex Deucher
parent 9de9a54aba
commit 36499e4c77
1 changed files with 17 additions and 18 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

31
drivers/gpu/drm/amd/amdgpu/dce_virtual.c
View file

@ -47,6 +47,9 @@ static void dce_virtual_set_display_funcs(struct amdgpu_device *adev);
static void dce_virtual_set_irq_funcs(struct amdgpu_device *adev); static void dce_virtual_set_irq_funcs(struct amdgpu_device *adev);
static int dce_virtual_connector_encoder_init(struct amdgpu_device *adev, static int dce_virtual_connector_encoder_init(struct amdgpu_device *adev,
int index); int index);
static int dce_virtual_pageflip(struct amdgpu_device *adev,
unsigned crtc_id);
static enum hrtimer_restart dce_virtual_vblank_timer_handle(struct hrtimer *vblank_timer);
static void dce_virtual_set_crtc_vblank_interrupt_state(struct amdgpu_device *adev, static void dce_virtual_set_crtc_vblank_interrupt_state(struct amdgpu_device *adev,
int crtc, int crtc,
enum amdgpu_interrupt_state state); enum amdgpu_interrupt_state state);
@ -247,6 +250,11 @@ static int dce_virtual_crtc_init(struct amdgpu_device *adev, int index)
amdgpu_crtc->vsync_timer_enabled = AMDGPU_IRQ_STATE_DISABLE; amdgpu_crtc->vsync_timer_enabled = AMDGPU_IRQ_STATE_DISABLE;
drm_crtc_helper_add(&amdgpu_crtc->base, &dce_virtual_crtc_helper_funcs); drm_crtc_helper_add(&amdgpu_crtc->base, &dce_virtual_crtc_helper_funcs);
hrtimer_init(&amdgpu_crtc->vblank_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hrtimer_set_expires(&amdgpu_crtc->vblank_timer, DCE_VIRTUAL_VBLANK_PERIOD);
amdgpu_crtc->vblank_timer.function = dce_virtual_vblank_timer_handle;
hrtimer_start(&amdgpu_crtc->vblank_timer,
DCE_VIRTUAL_VBLANK_PERIOD, HRTIMER_MODE_REL);
return 0; return 0;
} }
@ -476,7 +484,7 @@ static int dce_virtual_hw_fini(void *handle)
for (i = 0; i<adev->mode_info.num_crtc; i++) for (i = 0; i<adev->mode_info.num_crtc; i++)
if (adev->mode_info.crtcs[i]) if (adev->mode_info.crtcs[i])
dce_virtual_set_crtc_vblank_interrupt_state(adev, i, AMDGPU_IRQ_STATE_DISABLE); hrtimer_cancel(&adev->mode_info.crtcs[i]->vblank_timer);
return 0; return 0;
} }
@ -698,9 +706,15 @@ static enum hrtimer_restart dce_virtual_vblank_timer_handle(struct hrtimer *vbla
struct amdgpu_crtc, vblank_timer); struct amdgpu_crtc, vblank_timer);
struct drm_device *ddev = amdgpu_crtc->base.dev; struct drm_device *ddev = amdgpu_crtc->base.dev;
struct amdgpu_device *adev = drm_to_adev(ddev); struct amdgpu_device *adev = drm_to_adev(ddev);
struct amdgpu_irq_src *source = adev->irq.client[AMDGPU_IRQ_CLIENTID_LEGACY].sources
[VISLANDS30_IV_SRCID_SMU_DISP_TIMER2_TRIGGER];
int irq_type = amdgpu_display_crtc_idx_to_irq_type(adev,
amdgpu_crtc->crtc_id);
if (amdgpu_irq_enabled(adev, source, irq_type)) {
drm_handle_vblank(ddev, amdgpu_crtc->crtc_id); drm_handle_vblank(ddev, amdgpu_crtc->crtc_id);
dce_virtual_pageflip(adev, amdgpu_crtc->crtc_id); dce_virtual_pageflip(adev, amdgpu_crtc->crtc_id);
}
hrtimer_start(vblank_timer, DCE_VIRTUAL_VBLANK_PERIOD, hrtimer_start(vblank_timer, DCE_VIRTUAL_VBLANK_PERIOD,
HRTIMER_MODE_REL); HRTIMER_MODE_REL);
@ -716,21 +730,6 @@ static void dce_virtual_set_crtc_vblank_interrupt_state(struct amdgpu_device *ad
return; return;
} }
if (state && !adev->mode_info.crtcs[crtc]->vsync_timer_enabled) {
DRM_DEBUG("Enable software vsync timer\n");
hrtimer_init(&adev->mode_info.crtcs[crtc]->vblank_timer,
CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hrtimer_set_expires(&adev->mode_info.crtcs[crtc]->vblank_timer,
DCE_VIRTUAL_VBLANK_PERIOD);
adev->mode_info.crtcs[crtc]->vblank_timer.function =
dce_virtual_vblank_timer_handle;
hrtimer_start(&adev->mode_info.crtcs[crtc]->vblank_timer,
DCE_VIRTUAL_VBLANK_PERIOD, HRTIMER_MODE_REL);
} else if (!state && adev->mode_info.crtcs[crtc]->vsync_timer_enabled) {
DRM_DEBUG("Disable software vsync timer\n");
hrtimer_cancel(&adev->mode_info.crtcs[crtc]->vblank_timer);
}
adev->mode_info.crtcs[crtc]->vsync_timer_enabled = state; adev->mode_info.crtcs[crtc]->vsync_timer_enabled = state;
DRM_DEBUG("[FM]set crtc %d vblank interrupt state %d\n", crtc, state); DRM_DEBUG("[FM]set crtc %d vblank interrupt state %d\n", crtc, state);
} }