linux-kernel - Re: [v1 2/3] drm/msm/disp/dpu1: add dspps into reservation if there is a ctm request

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Date:   Wed, 1 Feb 2023 15:48:02 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>,
        Kalyan Thota <quic_kalyant@...cinc.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, robdclark@...omium.org,
        dianders@...omium.org, swboyd@...omium.org,
        quic_vpolimer@...cinc.com, quic_abhinavk@...cinc.com
Subject: Re: [v1 2/3] drm/msm/disp/dpu1: add dspps into reservation if there
 is a ctm request

On 01/02/2023 13:16, Marijn Suijten wrote:
> On 2023-01-30 07:21:31, Kalyan Thota wrote:
>> Add dspp blocks into the topology for reservation, if there is a ctm
>> request for that composition.
> 
> DSPP
> 
>> Changes in v1:
>> - Minor nits (Dmitry)
> 
> This should go below the triple dashes, so that it /does not/ become
> part of the patch/commit that is applied to the tree (where review
> history is irrelevant as it can be searched for separately).

This is one of DRM peculiarities which we have to live with.

> 
>> Signed-off-by: Kalyan Thota <quic_kalyant@...cinc.com>
>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>> ---
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 13 ++++++-------
>>   1 file changed, 6 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> index 9c6817b..3bd46b4 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
>> @@ -545,7 +545,8 @@ bool dpu_encoder_use_dsc_merge(struct drm_encoder *drm_enc)
>>   static struct msm_display_topology dpu_encoder_get_topology(
>>   			struct dpu_encoder_virt *dpu_enc,
>>   			struct dpu_kms *dpu_kms,
>> -			struct drm_display_mode *mode)
>> +			struct drm_display_mode *mode,
>> +			struct drm_crtc_state *crtc_state)
>>   {
>>   	struct msm_display_topology topology = {0};
>>   	int i, intf_count = 0;
>> @@ -573,11 +574,9 @@ static struct msm_display_topology dpu_encoder_get_topology(
>>   	else
>>   		topology.num_lm = (mode->hdisplay > MAX_HDISPLAY_SPLIT) ? 2 : 1;
>>   
>> -	if (dpu_enc->disp_info.intf_type == DRM_MODE_ENCODER_DSI) {
>> -		if (dpu_kms->catalog->dspp &&
>> -			(dpu_kms->catalog->dspp_count >= topology.num_lm))
>> -			topology.num_dspp = topology.num_lm;
>> -	}
>> +	if (dpu_kms->catalog->dspp &&
>> +	    crtc_state->ctm && (dpu_kms->catalog->dspp_count >= topology.num_lm))
> 
> Multiline-if-clause is typically indented with two tabs, not a half tab
> (4 spaces).

I tend to disagree here. Lately I have mostly seen it being indented to 
the opening parenthesis, so that nested statements also indent nicely.

> Nit: swap the && here?  dspp and dspp_count are related, so check ctm
> first or last but not in the middle - makes reading easier.

I think we can ignore dpu_kms->catalog->dspp completely. checking 
dspp_count should be enough for the purpose of the check (and note, the 
check for dspp/dspp_count is misleading and should be omitted).

> 
>> +		topology.num_dspp = topology.num_lm;
>>   
>>   	topology.num_enc = 0;
>>   	topology.num_intf = intf_count;
>> @@ -643,7 +642,7 @@ static int dpu_encoder_virt_atomic_check(
>>   		}
>>   	}
>>   
>> -	topology = dpu_encoder_get_topology(dpu_enc, dpu_kms, adj_mode);
>> +	topology = dpu_encoder_get_topology(dpu_enc, dpu_kms, adj_mode, crtc_state);
>>   
>>   	/* Reserve dynamic resources now. */
>>   	if (!ret) {
>> -- 
>> 2.7.4
>>

-- 
With best wishes
Dmitry