drm/msm/sde: fix race condition in vblank control interrupts
In Dual display concurrencies there are certain cases where irq_idx and vblank_refcount state mismatch can occur. To avoid it, during setup of irq_hw_idx, reset the vblank_refcount and unregister read ptr irq if not yet done by then along with maintaining global mutex lock for vblank_refcount. Also, if register IRQ fails, correct vblank_refcount so that IRQ registration can be tried again. Change-Id: I06bcbf71c6a43bd161ff61093d9f6063a292d6bc Signed-off-by: Raviteja Tamatam <travitej@codeaurora.org> Signed-off-by: Samantha Tran <samtran@codeaurora.org>
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@ -320,6 +320,8 @@ static void _sde_encoder_phys_cmd_setup_irq_hw_idx(
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struct sde_encoder_phys *phys_enc)
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{
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struct sde_encoder_irq *irq;
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struct sde_kms *sde_kms = phys_enc->sde_kms;
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int ret = 0;
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if (!phys_enc || !phys_enc->hw_pp || !phys_enc->hw_ctl) {
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SDE_ERROR("invalid args %d %d\n", !phys_enc,
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@ -332,6 +334,21 @@ static void _sde_encoder_phys_cmd_setup_irq_hw_idx(
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return;
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}
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mutex_lock(&sde_kms->vblank_ctl_global_lock);
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if (atomic_read(&phys_enc->vblank_refcount)) {
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SDE_ERROR(
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"vblank_refcount mismatch detected, try to reset %d\n",
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atomic_read(&phys_enc->vblank_refcount));
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ret = sde_encoder_helper_unregister_irq(phys_enc,
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INTR_IDX_RDPTR);
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if (ret)
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SDE_ERROR(
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"control vblank irq registration error %d\n",
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ret);
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}
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atomic_set(&phys_enc->vblank_refcount, 0);
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irq = &phys_enc->irq[INTR_IDX_CTL_START];
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irq->hw_idx = phys_enc->hw_ctl->idx;
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irq->irq_idx = -EINVAL;
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@ -365,6 +382,8 @@ static void _sde_encoder_phys_cmd_setup_irq_hw_idx(
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else
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irq->hw_idx = phys_enc->hw_pp->idx;
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mutex_unlock(&sde_kms->vblank_ctl_global_lock);
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}
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static void sde_encoder_phys_cmd_cont_splash_mode_set(
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@ -800,13 +819,15 @@ static int sde_encoder_phys_cmd_control_vblank_irq(
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to_sde_encoder_phys_cmd(phys_enc);
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int ret = 0;
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int refcount;
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struct sde_kms *sde_kms;
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if (!phys_enc || !phys_enc->hw_pp) {
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SDE_ERROR("invalid encoder\n");
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return -EINVAL;
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}
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sde_kms = phys_enc->sde_kms;
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mutex_lock(phys_enc->vblank_ctl_lock);
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mutex_lock(&sde_kms->vblank_ctl_global_lock);
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refcount = atomic_read(&phys_enc->vblank_refcount);
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/* Slave encoders don't report vblank */
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@ -824,11 +845,17 @@ static int sde_encoder_phys_cmd_control_vblank_irq(
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SDE_EVT32(DRMID(phys_enc->parent), phys_enc->hw_pp->idx - PINGPONG_0,
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enable, refcount);
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if (enable && atomic_inc_return(&phys_enc->vblank_refcount) == 1)
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if (enable && atomic_inc_return(&phys_enc->vblank_refcount) == 1) {
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ret = sde_encoder_helper_register_irq(phys_enc, INTR_IDX_RDPTR);
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else if (!enable && atomic_dec_return(&phys_enc->vblank_refcount) == 0)
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if (ret)
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atomic_dec_return(&phys_enc->vblank_refcount);
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} else if (!enable &&
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atomic_dec_return(&phys_enc->vblank_refcount) == 0) {
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ret = sde_encoder_helper_unregister_irq(phys_enc,
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INTR_IDX_RDPTR);
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if (ret)
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atomic_inc_return(&phys_enc->vblank_refcount);
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}
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end:
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if (ret) {
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@ -840,7 +867,7 @@ end:
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enable, refcount, SDE_EVTLOG_ERROR);
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}
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mutex_unlock(phys_enc->vblank_ctl_lock);
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mutex_unlock(&sde_kms->vblank_ctl_global_lock);
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return ret;
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}
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@ -3418,6 +3418,8 @@ static int sde_kms_hw_init(struct msm_kms *kms)
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dev->mode_config.max_height = sde_kms->catalog->max_display_height;
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mutex_init(&sde_kms->secure_transition_lock);
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mutex_init(&sde_kms->vblank_ctl_global_lock);
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atomic_set(&sde_kms->detach_sec_cb, 0);
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atomic_set(&sde_kms->detach_all_cb, 0);
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@ -299,6 +299,7 @@ struct sde_kms {
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atomic_t detach_sec_cb;
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atomic_t detach_all_cb;
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struct mutex secure_transition_lock;
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struct mutex vblank_ctl_global_lock;
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bool first_kickoff;
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bool qdss_enabled;
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