[PATCH v2 19/24] drm/msm: dpu: Remove vblank_callback from encoder

Sean Paul
2018-11-16T18:42:29Z

The indirection of registering a callback and opaque pointer isn't reall
useful when there's only one callsite. So instead of having the
vblank_cb registration, just give encoder a crtc and let it directly
call the vblank handler.

In a later patch, we'll make use of this further.

Changes in v2:
- None

Cc: Jeykumar Sankaran <jsanka@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 8 +++----
drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h | 6 +++++
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 25 +++++++++++----------
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h | 10 ++++-----
4 files changed, 26 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 141ed1b0e90a..4d7f9ff1e9f4 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -293,9 +293,8 @@ enum dpu_intf_mode dpu_crtc_get_intf_mode(struct drm_crtc *crtc)
return INTF_MODE_NONE;
}

-static void dpu_crtc_vblank_cb(void *data)
+void dpu_crtc_vblank_callback(struct drm_crtc *crtc)
{
- struct drm_crtc *crtc = (struct drm_crtc *)data;
struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);

/* keep statistics on vblank callback - with auto reset via debugfs */
@@ -771,8 +770,7 @@ static void _dpu_crtc_vblank_enable_no_lock(
DRMID(enc), enable,
dpu_crtc);

- dpu_encoder_register_vblank_callback(enc,
- dpu_crtc_vblank_cb, (void *)crtc);
+ dpu_encoder_assign_crtc(enc, crtc);
}
} else {
list_for_each_entry(enc, &dev->mode_config.encoder_list, head) {
@@ -783,7 +781,7 @@ static void _dpu_crtc_vblank_enable_no_lock(
DRMID(enc), enable,
dpu_crtc);

- dpu_encoder_register_vblank_callback(enc, NULL, NULL);
+ dpu_encoder_assign_crtc(enc, NULL);
}
}
}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
index 93d21a61a040..54595cc29be5 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
@@ -270,6 +270,12 @@ static inline int dpu_crtc_frame_pending(struct drm_crtc *crtc)
*/
int dpu_crtc_vblank(struct drm_crtc *crtc, bool en);

+/**
+ * dpu_crtc_vblank_callback - called on vblank irq, issues completion events
+ * @crtc: Pointer to drm crtc object
+ */
+void dpu_crtc_vblank_callback(struct drm_crtc *crtc);
+
/**
* dpu_crtc_commit_kickoff - trigger kickoff of the commit for this crtc
* @crtc: Pointer to drm crtc object
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index d89ac520f7e6..fd6514f681ae 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -142,9 +142,11 @@ enum dpu_enc_rc_states {
* @intfs_swapped Whether or not the phys_enc interfaces have been swapped
* for partial update right-only cases, such as pingpong
* split where virtual pingpong does not generate IRQs
- * @crtc_vblank_cb: Callback into the upper layer / CRTC for
- * notification of the VBLANK
- * @crtc_vblank_cb_data: Data from upper layer for VBLANK notification
+ * @crtc: Pointer to the currently assigned crtc. Normally you
+ * would use crtc->state->encoder_mask to determine the
+ * link between encoder/crtc. However in this case we need
+ * to track crtc in the disable() hook which is called
+ * _after_ encoder_mask is cleared.
* @crtc_kickoff_cb: Callback into CRTC that will flush & start
* all CTL paths
* @crtc_kickoff_cb_data: Opaque user data given to crtc_kickoff_cb
@@ -186,8 +188,7 @@ struct dpu_encoder_virt {

bool intfs_swapped;

- void (*crtc_vblank_cb)(void *);
- void *crtc_vblank_cb_data;
+ struct drm_crtc *crtc;

struct dentry *debugfs_root;
struct mutex enc_lock;
@@ -1241,8 +1242,8 @@ static void dpu_encoder_vblank_callback(struct drm_encoder *drm_enc,
dpu_enc = to_dpu_encoder_virt(drm_enc);

spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
- if (dpu_enc->crtc_vblank_cb)
- dpu_enc->crtc_vblank_cb(dpu_enc->crtc_vblank_cb_data);
+ if (dpu_enc->crtc)
+ dpu_crtc_vblank_callback(dpu_enc->crtc);
spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);

atomic_inc(&phy_enc->vsync_cnt);
@@ -1262,15 +1263,14 @@ static void dpu_encoder_underrun_callback(struct drm_encoder *drm_enc,
DPU_ATRACE_END("encoder_underrun_callback");
}

-void dpu_encoder_register_vblank_callback(struct drm_encoder *drm_enc,
- void (*vbl_cb)(void *), void *vbl_data)
+void dpu_encoder_assign_crtc(struct drm_encoder *drm_enc, struct drm_crtc *crtc)
{
struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
unsigned long lock_flags;
bool enable;
int i;

- enable = vbl_cb ? true : false;
+ enable = crtc ? true : false;

if (!drm_enc) {
DPU_ERROR("invalid encoder\n");
@@ -1279,8 +1279,9 @@ void dpu_encoder_register_vblank_callback(struct drm_encoder *drm_enc,
trace_dpu_enc_vblank_cb(DRMID(drm_enc), enable);

spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
- dpu_enc->crtc_vblank_cb = vbl_cb;
- dpu_enc->crtc_vblank_cb_data = vbl_data;
+ /* crtc should always be cleared before re-assigning */
+ WARN_ON(crtc && dpu_enc->crtc);
+ dpu_enc->crtc = crtc;
spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);

for (i = 0; i < dpu_enc->num_phys_encs; i++) {
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
index aa4f135218fa..be1d80867834 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
@@ -55,14 +55,12 @@ void dpu_encoder_get_hw_resources(struct drm_encoder *encoder,
struct dpu_encoder_hw_resources *hw_res);

/**
- * dpu_encoder_register_vblank_callback - provide callback to encoder that
- * will be called on the next vblank.
+ * dpu_encoder_assign_crtc - Link the encoder to the crtc it's assigned to
* @encoder: encoder pointer
- * @cb: callback pointer, provide NULL to deregister and disable IRQs
- * @data: user data provided to callback
+ * @crtc: crtc pointer
*/
-void dpu_encoder_register_vblank_callback(struct drm_encoder *encoder,
- void (*cb)(void *), void *data);
+void dpu_encoder_assign_crtc(struct drm_encoder *encoder,
+ struct drm_crtc *crtc);

/**
* dpu_encoder_register_frame_event_callback - provide callback to encoder that
--
Sean Paul, Software Engineer, Google / Chromium OS

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