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disp: msm: sde: add VM guard checks for vblank control

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Check against the HW ownership before servicing vblank
control requests from clients.

Change-Id: I22544817fde72afa7f668fbc08caa28abe0330ee
Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>
This commit is contained in:
Jeykumar Sankaran
2020-05-22 15:08:58 -07:00
committed by Gerrit - the friendly Code Review server
parent ce532fb486
commit f53b6a06ec
1 changed files with 51 additions and 0 deletions
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51
msm/sde/sde_kms.c
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@@ -200,22 +200,73 @@ static int _sde_kms_dump_clks_state(struct sde_kms *sde_kms)
} }
#endif #endif
static bool _sde_kms_skip_vblank_op(struct sde_kms *sde_kms)
{
struct sde_vm_ops *vm_ops = NULL;
if (!sde_kms->vm)
return false;
vm_ops = &sde_kms->vm->vm_ops;
if (!vm_ops->vm_owns_hw(sde_kms))
return true;
return false;
}
static int sde_kms_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc) static int sde_kms_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
{ {
int ret = 0; int ret = 0;
struct sde_kms *sde_kms;
if (!kms)
return -EINVAL;
sde_kms = to_sde_kms(kms);
if (sde_kms->vm)
mutex_lock(&sde_kms->vm->vm_res_lock);
if (_sde_kms_skip_vblank_op(sde_kms)) {
SDE_DEBUG("skipping vblank enable due to HW unavailablity\n");
mutex_unlock(&sde_kms->vm->vm_res_lock);
return 0;
}
SDE_ATRACE_BEGIN("sde_kms_enable_vblank"); SDE_ATRACE_BEGIN("sde_kms_enable_vblank");
ret = sde_crtc_vblank(crtc, true); ret = sde_crtc_vblank(crtc, true);
SDE_ATRACE_END("sde_kms_enable_vblank"); SDE_ATRACE_END("sde_kms_enable_vblank");
if (sde_kms->vm)
mutex_unlock(&sde_kms->vm->vm_res_lock);
return ret; return ret;
} }
static void sde_kms_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc) static void sde_kms_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
{ {
struct sde_kms *sde_kms;
if (!kms)
return;
sde_kms = to_sde_kms(kms);
if (sde_kms->vm)
mutex_lock(&sde_kms->vm->vm_res_lock);
if (_sde_kms_skip_vblank_op(sde_kms)) {
SDE_DEBUG("skipping vblank disable due to HW unavailablity\n");
mutex_unlock(&sde_kms->vm->vm_res_lock);
return;
}
SDE_ATRACE_BEGIN("sde_kms_disable_vblank"); SDE_ATRACE_BEGIN("sde_kms_disable_vblank");
sde_crtc_vblank(crtc, false); sde_crtc_vblank(crtc, false);
SDE_ATRACE_END("sde_kms_disable_vblank"); SDE_ATRACE_END("sde_kms_disable_vblank");
if (sde_kms->vm)
mutex_unlock(&sde_kms->vm->vm_res_lock);
} }
static void sde_kms_wait_for_frame_transfer_complete(struct msm_kms *kms, static void sde_kms_wait_for_frame_transfer_complete(struct msm_kms *kms,