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disp: msm: sde: add spinlocks to handle_frame_done call

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By adding spin locks around the handle frame done, a race
condition, between the wait for idle of one frame, and the pp
done of the next frame, is mitigated.

Change-Id: I78650fc9688b22db6d314b9bed023e0ddad20dbf
Signed-off-by: Nilaan Gunabalachandran <ngunabal@codeaurora.org>
This commit is contained in:
Nilaan Gunabalachandran
2019-10-02 17:44:50 -04:00
parent d8e9978b94
commit 47b493a29a
1 changed files with 21 additions and 3 deletions
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24
msm/sde/sde_encoder_phys_cmd.c
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@@ -186,8 +186,10 @@ static void sde_encoder_phys_cmd_pp_tx_done_irq(void *arg, int irq_idx)
atomic_add_unless(&phys_enc->pending_kickoff_cnt, -1, 0)) {
event = SDE_ENCODER_FRAME_EVENT_DONE |
SDE_ENCODER_FRAME_EVENT_SIGNAL_RELEASE_FENCE;
spin_lock(phys_enc->enc_spinlock);
phys_enc->parent_ops.handle_frame_done(phys_enc->parent,
phys_enc, event);
spin_unlock(phys_enc->enc_spinlock);
}
SDE_EVT32_IRQ(DRMID(phys_enc->parent),
@@ -285,9 +287,12 @@ static void sde_encoder_phys_cmd_wr_ptr_irq(void *arg, int irq_idx)
if (atomic_add_unless(&phys_enc->pending_retire_fence_cnt, -1, 0)) {
event = SDE_ENCODER_FRAME_EVENT_SIGNAL_RETIRE_FENCE;
if (phys_enc->parent_ops.handle_frame_done)
if (phys_enc->parent_ops.handle_frame_done) {
spin_lock(phys_enc->enc_spinlock);
phys_enc->parent_ops.handle_frame_done(
phys_enc->parent, phys_enc, event);
spin_unlock(phys_enc->enc_spinlock);
}
}
sde_encoder_helper_get_pp_line_count(phys_enc->parent, info);
@@ -467,6 +472,7 @@ static int _sde_encoder_phys_cmd_handle_ppdone_timeout(
struct drm_connector *conn;
int event;
u32 pending_kickoff_cnt;
unsigned long lock_flags;
if (!phys_enc || !phys_enc->hw_pp || !phys_enc->hw_ctl)
return -EINVAL;
@@ -523,9 +529,12 @@ static int _sde_encoder_phys_cmd_handle_ppdone_timeout(
phys_enc->enable_state = SDE_ENC_ERR_NEEDS_HW_RESET;
exit:
if (phys_enc->parent_ops.handle_frame_done)
if (phys_enc->parent_ops.handle_frame_done) {
spin_lock_irqsave(phys_enc->enc_spinlock, lock_flags);
phys_enc->parent_ops.handle_frame_done(
phys_enc->parent, phys_enc, frame_event);
spin_unlock_irqrestore(phys_enc->enc_spinlock, lock_flags);
}
return -ETIMEDOUT;
}
@@ -664,6 +673,7 @@ static int _sde_encoder_phys_cmd_wait_for_idle(
int ret;
struct sde_hw_ctl *ctl;
bool wr_ptr_wait_success = true;
unsigned long lock_flags;
if (!phys_enc) {
SDE_ERROR("invalid encoder\n");
@@ -682,10 +692,12 @@ static int _sde_encoder_phys_cmd_wait_for_idle(
atomic_add_unless(&phys_enc->pending_kickoff_cnt, -1, 0) &&
phys_enc->parent_ops.handle_frame_done) {
spin_lock_irqsave(phys_enc->enc_spinlock, lock_flags);
phys_enc->parent_ops.handle_frame_done(
phys_enc->parent, phys_enc,
SDE_ENCODER_FRAME_EVENT_DONE |
SDE_ENCODER_FRAME_EVENT_SIGNAL_RELEASE_FENCE);
spin_unlock_irqrestore(phys_enc->enc_spinlock, lock_flags);
return 0;
}
@@ -1466,6 +1478,7 @@ static int _sde_encoder_phys_cmd_handle_wr_ptr_timeout(
to_sde_encoder_phys_cmd(phys_enc);
bool switch_te;
int ret = -ETIMEDOUT;
unsigned long lock_flags;
switch_te = _sde_encoder_phys_cmd_needs_vsync_change(
phys_enc, profile_timestamp);
@@ -1495,10 +1508,15 @@ static int _sde_encoder_phys_cmd_handle_wr_ptr_timeout(
SDE_EVT32(DRMID(phys_enc->parent), switch_te, SDE_EVTLOG_ERROR);
if (sde_encoder_phys_cmd_is_master(phys_enc) &&
atomic_add_unless(&phys_enc->pending_retire_fence_cnt, -1, 0))
atomic_add_unless(
&phys_enc->pending_retire_fence_cnt, -1, 0)) {
spin_lock_irqsave(phys_enc->enc_spinlock, lock_flags);
phys_enc->parent_ops.handle_frame_done(
phys_enc->parent, phys_enc,
SDE_ENCODER_FRAME_EVENT_SIGNAL_RETIRE_FENCE);
spin_unlock_irqrestore(phys_enc->enc_spinlock,
lock_flags);
}
}
cmd_enc->wr_ptr_wait_success = (ret == 0) ? true : false;