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Message-ID: <3dd62c7e-e419-9ea2-b383-4c1c0959fecf@quicinc.com>
Date: Sun, 25 Feb 2024 17:35:56 -0800
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Rob Clark
<robdclark@...il.com>, Sean Paul <sean@...rly.run>,
Marijn Suijten
<marijn.suijten@...ainline.org>,
David Airlie <airlied@...il.com>, Daniel
Vetter <daniel@...ll.ch>
CC: Steev Klimaszewski <steev@...i.org>, <linux-arm-msm@...r.kernel.org>,
<dri-devel@...ts.freedesktop.org>, <freedreno@...ts.freedesktop.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] drm/msm/dpu: capture snapshot on the first
commit_done timeout
On 2/25/2024 11:57 AM, Abhinav Kumar wrote:
>
>
> On 2/25/2024 6:12 AM, Dmitry Baryshkov wrote:
>> In order to debug commit_done timeouts, capture the devcoredump state
>> when the first timeout occurs after the encoder has been enabled.
>>
>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>> ---
>> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 9 +++++++++
>> 1 file changed, 9 insertions(+)
>>
>
> This looks fine now. Once we discuss patch 2, I can ack this.
>
Not entirely onboard with patch 2, but lets see how that code evolves
Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> index 30f349c8a1e5..3cae07bf0b9b 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> @@ -126,6 +126,8 @@ enum dpu_enc_rc_states {
>> * @base: drm_encoder base class for registration with DRM
>> * @enc_spinlock: Virtual-Encoder-Wide Spin Lock for IRQ purposes
>> * @enabled: True if the encoder is active, protected by
>> enc_lock
>> + * @commit_done_timedout: True if there has been a timeout on commit
>> after
>> + * enabling the encoder.
>> * @num_phys_encs: Actual number of physical encoders contained.
>> * @phys_encs: Container of physical encoders managed.
>> * @cur_master: Pointer to the current master in this mode.
>> Optimization
>> @@ -172,6 +174,7 @@ struct dpu_encoder_virt {
>> spinlock_t enc_spinlock;
>> bool enabled;
>> + bool commit_done_timedout;
>> unsigned int num_phys_encs;
>> struct dpu_encoder_phys *phys_encs[MAX_PHYS_ENCODERS_PER_VIRTUAL];
>> @@ -1226,6 +1229,8 @@ static void
>> dpu_encoder_virt_atomic_enable(struct drm_encoder *drm_enc,
>> else if (disp_info->intf_type == INTF_DSI)
>> dpu_enc->wide_bus_en =
>> msm_dsi_wide_bus_enabled(priv->dsi[index]);
>> + dpu_enc->commit_done_timedout = false;
>> +
>> mutex_lock(&dpu_enc->enc_lock);
>> cur_mode = &dpu_enc->base.crtc->state->adjusted_mode;
>> @@ -2436,6 +2441,10 @@ int dpu_encoder_wait_for_commit_done(struct
>> drm_encoder *drm_enc)
>> DPU_ATRACE_BEGIN("wait_for_commit_done");
>> ret = phys->ops.wait_for_commit_done(phys);
>> DPU_ATRACE_END("wait_for_commit_done");
>> + if (ret == -ETIMEDOUT && !dpu_enc->commit_done_timedout) {
>> + dpu_enc->commit_done_timedout = true;
>> + msm_disp_snapshot_state(drm_enc->dev);
>> + }
>> if (ret)
>> return ret;
>> }
>>
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