linux-kernel - Re: [PATCH 10/16] drm/msm/dpu: add support to disable CDM block during encoder cleanup

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Message-ID: <5c16e398-4010-718b-d91d-5fc3781b9c0a@quicinc.com>
Date:   Thu, 30 Nov 2023 15:58:24 -0800
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC:     <freedreno@...ts.freedesktop.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>,
        <dri-devel@...ts.freedesktop.org>, <quic_jesszhan@...cinc.com>,
        <quic_parellan@...cinc.com>, <quic_khsieh@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/16] drm/msm/dpu: add support to disable CDM block
 during encoder cleanup



On 8/30/2023 5:14 PM, Dmitry Baryshkov wrote:
> On Thu, 31 Aug 2023 at 01:50, Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
>>
>> In preparation of setting up CDM block, add the logic to disable it
>> properly during encoder cleanup.
>>
>> Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
>> ---
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c      | 8 ++++++++
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h | 2 ++
>>   2 files changed, 10 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> index 582680804016..1b1e07292a9e 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> @@ -26,6 +26,7 @@
>>   #include "dpu_hw_dspp.h"
>>   #include "dpu_hw_dsc.h"
>>   #include "dpu_hw_merge3d.h"
>> +#include "dpu_hw_cdm.h"
>>   #include "dpu_formats.h"
>>   #include "dpu_encoder_phys.h"
>>   #include "dpu_crtc.h"
>> @@ -2097,6 +2098,13 @@ void dpu_encoder_helper_phys_cleanup(struct dpu_encoder_phys *phys_enc)
>>                                          phys_enc->hw_pp->merge_3d->idx);
>>          }
>>
>> +       if (phys_enc->hw_cdm && phys_enc->hw_cdm->ops.bind_pingpong_blk && phys_enc->hw_pp) {
>> +               phys_enc->hw_cdm->ops.bind_pingpong_blk(phys_enc->hw_cdm,
>> +                                                       false, phys_enc->hw_pp->idx);
> 
> But it was already bound in the cdm->enable, wasn't it?
> 

This is disable. I think you missed the "false" parameter.

> Also the update_pending_flush_cdm should be called even for DPU < 5.0,
> where there should be no bind_pingpong_blk callback.
> 

Ack. This is a good catch!

>> +               if (phys_enc->hw_ctl->ops.update_pending_flush_cdm)
>> +                       phys_enc->hw_ctl->ops.update_pending_flush_cdm(phys_enc->hw_ctl);
>> +       }
>> +
>>          if (dpu_enc->dsc) {
>>                  dpu_encoder_unprep_dsc(dpu_enc);
>>                  dpu_enc->dsc = NULL;
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
>> index 24dbc28be4f8..510c1c41ddbc 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
>> @@ -150,6 +150,7 @@ enum dpu_intr_idx {
>>    * @hw_pp:             Hardware interface to the ping pong registers
>>    * @hw_intf:           Hardware interface to the intf registers
>>    * @hw_wb:             Hardware interface to the wb registers
>> + * @hw_cdm:            Hardware interface to the CDM registers
>>    * @dpu_kms:           Pointer to the dpu_kms top level
>>    * @cached_mode:       DRM mode cached at mode_set time, acted on in enable
>>    * @enabled:           Whether the encoder has enabled and running a mode
>> @@ -178,6 +179,7 @@ struct dpu_encoder_phys {
>>          struct dpu_hw_pingpong *hw_pp;
>>          struct dpu_hw_intf *hw_intf;
>>          struct dpu_hw_wb *hw_wb;
>> +       struct dpu_hw_cdm *hw_cdm;
>>          struct dpu_kms *dpu_kms;
>>          struct drm_display_mode cached_mode;
>>          enum dpu_enc_split_role split_role;
>> --
>> 2.40.1
>>
> 
>