linux-kernel - Re: [PATCH v10 7/8] drm/msm/dpu: add DSC 1.2 hw blocks for relevant chipsets

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Date:   Thu, 18 May 2023 12:00:22 -0700
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
CC:     Kuogee Hsieh <quic_khsieh@...cinc.com>,
        <freedreno@...ts.freedesktop.org>, <quic_sbillaka@...cinc.com>,
        <andersson@...nel.org>, <dri-devel@...ts.freedesktop.org>,
        <dianders@...omium.org>, <vkoul@...nel.org>, <agross@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <dmitry.baryshkov@...aro.org>,
        <quic_jesszhan@...cinc.com>, <swboyd@...omium.org>,
        <sean@...rly.run>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v10 7/8] drm/msm/dpu: add DSC 1.2 hw blocks for relevant
 chipsets



On 5/18/2023 12:05 AM, Marijn Suijten wrote:
> On 2023-05-17 16:22:37, Abhinav Kumar wrote:
> <snip>
>>>> @@ -529,6 +539,19 @@ static const struct dpu_pingpong_sub_blks sc7280_pp_sblk = {
>>>>    	.features = _features, \
>>>>    	}
>>>>    
>>>> +/*
>>>> + * NOTE: Each display compression engine (DCE) contains dual hard
>>>> + * slice DSC encoders so both share same base address but with
>>>> + * its own different sub block address.
>>>> + */
>>>
>>> I still think this comment is superfluous (and doesn't even apply
>>> generically, see i.e. sc7280) and should best be kept exclusively in the
>>> SoC-specific catalog files.
>>>
>>> - Marijn
>>>
>>
>> sc7280 is the only exception as it has only one encoder. But, by and
>> large, for all other chipsets this is true and hence kept here.
>>
>> The main reason for this comment is people should not get confused that
>> how come two DSC encoders have the same base address.
> 
> And that's why the comment is already placed in the SoC-specific catalog
> files where a duplicate base address is visible.  It is not visible
> here.
> 
> - Marijn
> 

ok, if kuogee pushes a v11, we can drop it.

>>>> +#define DSC_BLK_1_2(_name, _id, _base, _len, _features, _sblk) \
>>>> +	{\
>>>> +	.name = _name, .id = _id, \
>>>> +	.base = _base, .len = _len, \
>>>> +	.features = BIT(DPU_DSC_HW_REV_1_2) | _features, \
>>>> +	.sblk = &_sblk, \
>>>> +	}
>>>> +
>>>>    /*************************************************************
>>>>     * INTF sub blocks config
>>>>     *************************************************************/
>>>> -- 
>>>> 2.7.4
>>>>