Update crtc retrieval from dpu_enc to dpu_enc connector state,
since new links get set as part of the dpu enc virt mode set.
The dpu_enc->crtc cache is no more needed, hence cleaning it as
part of this change.
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 4 ----
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 35 ++++++++++++-----------------
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h | 8 -------
3 files changed, 14 insertions(+), 33 deletions(-)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 13ce321..8ec9a13 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1029,7 +1029,6 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
*/
if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_VIDEO)
release_bandwidth = true;
- dpu_encoder_assign_crtc(encoder, NULL);
}
/* wait for frame_event_done completion */
@@ -1099,9 +1098,6 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
dpu_crtc->enabled = true;
- drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
- dpu_encoder_assign_crtc(encoder, crtc);
-
/* Enable/restore vblank irq handling */
drm_crtc_vblank_on(crtc);
}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 9c6817b..0c7d8b5 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -132,11 +132,6 @@ 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: 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.
* @connector: If a mode is set, cached pointer to the active connector
* @crtc_kickoff_cb: Callback into CRTC that will flush & start
* all CTL paths
@@ -181,7 +176,6 @@ struct dpu_encoder_virt {
bool intfs_swapped;
- struct drm_crtc *crtc;
struct drm_connector *connector;
struct dentry *debugfs_root;
@@ -1288,6 +1282,7 @@ static void dpu_encoder_vblank_callback(struct drm_encoder *drm_enc,
struct dpu_encoder_phys *phy_enc)
{
struct dpu_encoder_virt *dpu_enc = NULL;
+ struct drm_crtc *crtc;
unsigned long lock_flags;
if (!drm_enc || !phy_enc)
@@ -1298,9 +1293,14 @@ static void dpu_encoder_vblank_callback(struct drm_encoder *drm_enc,
atomic_inc(&phy_enc->vsync_cnt);
+ if (!dpu_enc->connector || !dpu_enc->connector->state)
+ return;
+
+ crtc = dpu_enc->connector->state->crtc;
+
spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
- if (dpu_enc->crtc)
- dpu_crtc_vblank_callback(dpu_enc->crtc);
+ if (crtc)
+ dpu_crtc_vblank_callback(crtc);
spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
DPU_ATRACE_END("encoder_vblank_callback");
@@ -1324,29 +1324,22 @@ static void dpu_encoder_underrun_callback(struct drm_encoder *drm_enc,
DPU_ATRACE_END("encoder_underrun_callback");
}
-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;
-
- spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
- /* 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);
-}
-
void dpu_encoder_toggle_vblank_for_crtc(struct drm_encoder *drm_enc,
struct drm_crtc *crtc, bool enable)
{
struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
+ struct drm_crtc *new_crtc;
unsigned long lock_flags;
int i;
trace_dpu_enc_vblank_cb(DRMID(drm_enc), enable);
+ if (!dpu_enc->connector || !dpu_enc->connector->state)
+ return;
+
+ new_crtc = dpu_enc->connector->state->crtc;
spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
- if (dpu_enc->crtc != crtc) {
+ if (!new_crtc || new_crtc != crtc) {
spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
return;
}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
index 9e7236e..eda5cd8 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
@@ -40,14 +40,6 @@ struct msm_display_info {
};
/**
- * dpu_encoder_assign_crtc - Link the encoder to the crtc it's assigned to
- * @encoder: encoder pointer
- * @crtc: crtc pointer
- */
-void dpu_encoder_assign_crtc(struct drm_encoder *encoder,
- struct drm_crtc *crtc);
-
-/**
* dpu_encoder_toggle_vblank_for_crtc - Toggles vblank interrupts on or off if
* the encoder is assigned to the given crtc
* @encoder: encoder pointer
--
2.7.4On 13/09/2022 17:51, Vinod Polimera wrote:
> Update crtc retrieval from dpu_enc to dpu_enc connector state,
> since new links get set as part of the dpu enc virt mode set.
> The dpu_enc->crtc cache is no more needed, hence cleaning it as
> part of this change.
>
> Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 4 ----
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 35 ++++++++++++-----------------
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h | 8 -------
> 3 files changed, 14 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 13ce321..8ec9a13 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -1029,7 +1029,6 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
> */
> if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_VIDEO)
> release_bandwidth = true;
> - dpu_encoder_assign_crtc(encoder, NULL);
> }
>
> /* wait for frame_event_done completion */
> @@ -1099,9 +1098,6 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
> trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
> dpu_crtc->enabled = true;
>
> - drm_for_each_encoder_mask(encoder, crtc->dev, crtc->state->encoder_mask)
> - dpu_encoder_assign_crtc(encoder, crtc);
> -
> /* Enable/restore vblank irq handling */
> drm_crtc_vblank_on(crtc);
> }
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 9c6817b..0c7d8b5 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -132,11 +132,6 @@ 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: 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.
> * @connector: If a mode is set, cached pointer to the active connector
> * @crtc_kickoff_cb: Callback into CRTC that will flush & start
> * all CTL paths
> @@ -181,7 +176,6 @@ struct dpu_encoder_virt {
>
> bool intfs_swapped;
>
> - struct drm_crtc *crtc;
> struct drm_connector *connector;
>
> struct dentry *debugfs_root;
> @@ -1288,6 +1282,7 @@ static void dpu_encoder_vblank_callback(struct drm_encoder *drm_enc,
> struct dpu_encoder_phys *phy_enc)
> {
> struct dpu_encoder_virt *dpu_enc = NULL;
> + struct drm_crtc *crtc;
> unsigned long lock_flags;
>
> if (!drm_enc || !phy_enc)
> @@ -1298,9 +1293,14 @@ static void dpu_encoder_vblank_callback(struct drm_encoder *drm_enc,
>
> atomic_inc(&phy_enc->vsync_cnt);
>
> + if (!dpu_enc->connector || !dpu_enc->connector->state)
> + return;
> +
> + crtc = dpu_enc->connector->state->crtc;
> +
> spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
> - if (dpu_enc->crtc)
> - dpu_crtc_vblank_callback(dpu_enc->crtc);
> + if (crtc)
> + dpu_crtc_vblank_callback(crtc);
> spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
Stephen's comment about reading the state from outside of the lock and
then using local variable under spinlock is still valid. Moreover I'm
not sure that enc_spinlock protects connector's state. I'd say one has
to take the modesetting lock here.
>
> DPU_ATRACE_END("encoder_vblank_callback");
> @@ -1324,29 +1324,22 @@ static void dpu_encoder_underrun_callback(struct drm_encoder *drm_enc,
> DPU_ATRACE_END("encoder_underrun_callback");
> }
>
> -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;
> -
> - spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
> - /* 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);
> -}
> -
> void dpu_encoder_toggle_vblank_for_crtc(struct drm_encoder *drm_enc,
> struct drm_crtc *crtc, bool enable)
> {
> struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
> + struct drm_crtc *new_crtc;
> unsigned long lock_flags;
> int i;
>
> trace_dpu_enc_vblank_cb(DRMID(drm_enc), enable);
>
> + if (!dpu_enc->connector || !dpu_enc->connector->state)
> + return;
> +
> + new_crtc = dpu_enc->connector->state->crtc;
> spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
> - if (dpu_enc->crtc != crtc) {
> + if (!new_crtc || new_crtc != crtc) {
> spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
> return;
> }
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> index 9e7236e..eda5cd8 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
> @@ -40,14 +40,6 @@ struct msm_display_info {
> };
>
> /**
> - * dpu_encoder_assign_crtc - Link the encoder to the crtc it's assigned to
> - * @encoder: encoder pointer
> - * @crtc: crtc pointer
> - */
> -void dpu_encoder_assign_crtc(struct drm_encoder *encoder,
> - struct drm_crtc *crtc);
> -
> -/**
> * dpu_encoder_toggle_vblank_for_crtc - Toggles vblank interrupts on or off if
> * the encoder is assigned to the given crtc
> * @encoder: encoder pointer
--
With best wishes
Dmitry
On 13/09/2022 20:04, Dmitry Baryshkov wrote:
> On 13/09/2022 17:51, Vinod Polimera wrote:
>> Update crtc retrieval from dpu_enc to dpu_enc connector state,
>> since new links get set as part of the dpu enc virt mode set.
>> The dpu_enc->crtc cache is no more needed, hence cleaning it as
>> part of this change.
>>
>> Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
>> ---
>> drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 4 ----
>> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 35
>> ++++++++++++-----------------
>> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h | 8 -------
>> 3 files changed, 14 insertions(+), 33 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
>> index 13ce321..8ec9a13 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
>> @@ -1029,7 +1029,6 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
>> */
>> if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_VIDEO)
>> release_bandwidth = true;
>> - dpu_encoder_assign_crtc(encoder, NULL);
>> }
>> /* wait for frame_event_done completion */
>> @@ -1099,9 +1098,6 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
>> trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
>> dpu_crtc->enabled = true;
>> - drm_for_each_encoder_mask(encoder, crtc->dev,
>> crtc->state->encoder_mask)
>> - dpu_encoder_assign_crtc(encoder, crtc);
>> -
>> /* Enable/restore vblank irq handling */
>> drm_crtc_vblank_on(crtc);
>> }
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> index 9c6817b..0c7d8b5 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> @@ -132,11 +132,6 @@ 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: 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.
>> * @connector: If a mode is set, cached pointer to the active
>> connector
>> * @crtc_kickoff_cb: Callback into CRTC that will flush & start
>> * all CTL paths
>> @@ -181,7 +176,6 @@ struct dpu_encoder_virt {
>> bool intfs_swapped;
>> - struct drm_crtc *crtc;
>> struct drm_connector *connector;
>> struct dentry *debugfs_root;
>> @@ -1288,6 +1282,7 @@ static void dpu_encoder_vblank_callback(struct
>> drm_encoder *drm_enc,
>> struct dpu_encoder_phys *phy_enc)
>> {
>> struct dpu_encoder_virt *dpu_enc = NULL;
>> + struct drm_crtc *crtc;
>> unsigned long lock_flags;
>> if (!drm_enc || !phy_enc)
>> @@ -1298,9 +1293,14 @@ static void dpu_encoder_vblank_callback(struct
>> drm_encoder *drm_enc,
>> atomic_inc(&phy_enc->vsync_cnt);
>> + if (!dpu_enc->connector || !dpu_enc->connector->state)
>> + return;
>> +
>> + crtc = dpu_enc->connector->state->crtc;
>> +
>> spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
>> - if (dpu_enc->crtc)
>> - dpu_crtc_vblank_callback(dpu_enc->crtc);
>> + if (crtc)
>> + dpu_crtc_vblank_callback(crtc);
>> spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
>
> Stephen's comment about reading the state from outside of the lock and
> then using local variable under spinlock is still valid. Moreover I'm
> not sure that enc_spinlock protects connector's state. I'd say one has
> to take the modesetting lock here.
s/Stephen's/Doug's/
--
With best wishes
Dmitry
> -----Original Message-----
> From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> Sent: Tuesday, September 13, 2022 10:36 PM
> To: Vinod Polimera (QUIC) <quic_vpolimer@quicinc.com>; dri-
> devel@lists.freedesktop.org; linux-arm-msm@vger.kernel.org;
> freedreno@lists.freedesktop.org; devicetree@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org; robdclark@gmail.com;
> dianders@chromium.org; swboyd@chromium.org; Kalyan Thota (QUIC)
> <quic_kalyant@quicinc.com>; Kuogee Hsieh (QUIC)
> <quic_khsieh@quicinc.com>; Vishnuvardhan Prodduturi (QUIC)
> <quic_vproddut@quicinc.com>; Bjorn Andersson (QUIC)
> <quic_bjorande@quicinc.com>; Aravind Venkateswaran (QUIC)
> <quic_aravindh@quicinc.com>; Abhinav Kumar (QUIC)
> <quic_abhinavk@quicinc.com>; Sankeerth Billakanti (QUIC)
> <quic_sbillaka@quicinc.com>
> Subject: Re: [PATCH v7 01/15] drm/msm/disp/dpu: clear dpu_assign_crtc and
> get crtc from connector state instead of dpu_enc
>
> WARNING: This email originated from outside of Qualcomm. Please be wary
> of any links or attachments, and do not enable macros.
>
> On 13/09/2022 20:04, Dmitry Baryshkov wrote:
> > On 13/09/2022 17:51, Vinod Polimera wrote:
> >> Update crtc retrieval from dpu_enc to dpu_enc connector state,
> >> since new links get set as part of the dpu enc virt mode set.
> >> The dpu_enc->crtc cache is no more needed, hence cleaning it as
> >> part of this change.
> >>
> >> Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
> >> ---
> >> drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 4 ----
> >> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 35
> >> ++++++++++++-----------------
> >> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h | 8 -------
> >> 3 files changed, 14 insertions(+), 33 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> >> b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> >> index 13ce321..8ec9a13 100644
> >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> >> @@ -1029,7 +1029,6 @@ static void dpu_crtc_disable(struct drm_crtc
> *crtc,
> >> */
> >> if (dpu_encoder_get_intf_mode(encoder) == INTF_MODE_VIDEO)
> >> release_bandwidth = true;
> >> - dpu_encoder_assign_crtc(encoder, NULL);
> >> }
> >> /* wait for frame_event_done completion */
> >> @@ -1099,9 +1098,6 @@ static void dpu_crtc_enable(struct drm_crtc
> *crtc,
> >> trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
> >> dpu_crtc->enabled = true;
> >> - drm_for_each_encoder_mask(encoder, crtc->dev,
> >> crtc->state->encoder_mask)
> >> - dpu_encoder_assign_crtc(encoder, crtc);
> >> -
> >> /* Enable/restore vblank irq handling */
> >> drm_crtc_vblank_on(crtc);
> >> }
> >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >> index 9c6817b..0c7d8b5 100644
> >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >> @@ -132,11 +132,6 @@ 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: 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.
> >> * @connector: If a mode is set, cached pointer to the active
> >> connector
> >> * @crtc_kickoff_cb: Callback into CRTC that will flush & start
> >> * all CTL paths
> >> @@ -181,7 +176,6 @@ struct dpu_encoder_virt {
> >> bool intfs_swapped;
> >> - struct drm_crtc *crtc;
> >> struct drm_connector *connector;
> >> struct dentry *debugfs_root;
> >> @@ -1288,6 +1282,7 @@ static void dpu_encoder_vblank_callback(struct
> >> drm_encoder *drm_enc,
> >> struct dpu_encoder_phys *phy_enc)
> >> {
> >> struct dpu_encoder_virt *dpu_enc = NULL;
> >> + struct drm_crtc *crtc;
> >> unsigned long lock_flags;
> >> if (!drm_enc || !phy_enc)
> >> @@ -1298,9 +1293,14 @@ static void
> dpu_encoder_vblank_callback(struct
> >> drm_encoder *drm_enc,
> >> atomic_inc(&phy_enc->vsync_cnt);
> >> + if (!dpu_enc->connector || !dpu_enc->connector->state)
> >> + return;
> >> +
> >> + crtc = dpu_enc->connector->state->crtc;
> >> +
> >> spin_lock_irqsave(&dpu_enc->enc_spinlock, lock_flags);
> >> - if (dpu_enc->crtc)
> >> - dpu_crtc_vblank_callback(dpu_enc->crtc);
> >> + if (crtc)
> >> + dpu_crtc_vblank_callback(crtc);
> >> spin_unlock_irqrestore(&dpu_enc->enc_spinlock, lock_flags);
> >
> > Stephen's comment about reading the state from outside of the lock and
> > then using local variable under spinlock is still valid. Moreover I'm
> > not sure that enc_spinlock protects connector's state. I'd say one has
> > to take the modesetting lock here.
>
> s/Stephen's/Doug's/
As this is in interrupt context , we cannot use modeset lock here and connector does not have the spinlock to protect state.
since state swap happens after commit to hw done, which is after vblank processing, i was thinking it should be okay to drop the spinlock while accessing connector state.
I have updated the patch with the changes in v8, please do review.
>
> --
> With best wishes
> Dmitry
Thanks
Vinod P.
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