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Message-ID: <cc537736-a555-dc3e-2e53-f1d4479eab21@quicinc.com>
Date:   Tue, 25 Apr 2023 09:47:30 -0700
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Subject: Re: [Freedreno] [PATCH v2 04/17] drm/msm/dpu: Fix PP_BLK_DIPHER ->
 DITHER typo
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To:     Marijn Suijten <marijn.suijten@somainline.org>
CC:     <dri-devel@lists.freedesktop.org>,
        Jordan Crouse <jordan@cosmicpenguin.net>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@somainline.org>,
        David Airlie <airlied@gmail.com>,
        Chandan Uddaraju <chandanu@codeaurora.org>,
        Archit Taneja <architt@codeaurora.org>,
        Robert Foss <rfoss@kernel.org>, Vinod Koul <vkoul@kernel.org>,
        Kuogee Hsieh <quic_khsieh@quicinc.com>,
        Rajesh Yadav <ryadav@codeaurora.org>,
        <linux-arm-msm@vger.kernel.org>,
        Adam Skladowski <a39.skl@gmail.com>,
        Martin Botka <martin.botka@somainline.org>,
        <~postmarketos/upstreaming@lists.sr.ht>,
        Jeykumar Sankaran <jsanka@codeaurora.org>,
        Sean Paul <sean@poorly.run>,
        Neil Armstrong <neil.armstrong@linaro.org>,
        Loic Poulain <loic.poulain@linaro.org>,
        "Jami Kettunen" <jami.kettunen@somainline.org>,
        Bjorn Andersson <andersson@kernel.org>,
        <linux-kernel@vger.kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Rob Clark <robdclark@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        <freedreno@lists.freedesktop.org>,
        Sravanthi Kollukuduru <skolluku@codeaurora.org>
References: <20230411-dpu-intf-te-v2-0-ef76c877eb97@somainline.org>
 <20230411-dpu-intf-te-v2-4-ef76c877eb97@somainline.org>
 <a0a0b8fb-0d6b-d11b-5596-d61c41aabe7f@quicinc.com>
 <bhatfkgdkjt2bih4lcwa5cxcp3w2tkjrqmbdhqhzqa2cizrmxs@py3gr5vifsoc>
 <65bb4d8a-c607-4152-0ae3-bf3134955925@quicinc.com>
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 <7541b780-482e-ea92-f788-18c8fbf45d77@quicinc.com>
 <o536qdkbrqob5wux7jvmo7expwn4bdlj7vy7egjfsyydxp5myb@xjhmolci5jzl>
From:   Abhinav Kumar <quic_abhinavk@quicinc.com>
In-Reply-To: <o536qdkbrqob5wux7jvmo7expwn4bdlj7vy7egjfsyydxp5myb@xjhmolci5jzl>
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On 4/25/2023 9:33 AM, Marijn Suijten wrote:
> On 2023-04-25 09:18:58, Abhinav Kumar wrote:
>>
>>
>> On 4/24/2023 11:54 PM, Marijn Suijten wrote:
>>> On 2023-04-24 16:09:45, Abhinav Kumar wrote:
>>> <snip>
>>>>>> dither block should be present on many other chipsets too but looks like
>>>>>> on sm8550 was enabling it. Not sure how it was validated there. But we
>>>>>> are enabling dither, even other chipsets have this block.
>>>>>
>>>>> Correct, they all seem to have it starting at sdm845.  My patch message
>>>>> seems to lack the word "exclusively" as the PP on sm8550 appears to
>>>>> exclusively contain a DITHER subblock (unless other blocks are available
>>>>> that simply aren't supported within this driver yet) and no other
>>>>> registers.  Hence this aptly named macro exist to emit just the feature
>>>>> bitflag for that and a .len of zero.
>>>>>
>>>>
>>>> I think after the TE blocks were moved to INTF, dither is the only
>>>> sub-block for all Ping-Pongs not just in sm8550.
>>>
>>> So you are asking / leaving context to make all >= 5.0.0 pingpong blocks
>>> use this macro with only a single DITHER sblk in PP?
>>>
>>> As far as I recall SM8550 is the first SoC to use zero registers in PP,
>>> which is specifically what this macro takes care of too.  Then, there
>>> are only a few SoCs downstream still (erroneously?) referencing TE2 as
>>> the only other sub-blk, those SoCs still use sdm845_pp_sblk_te.
>>>
>>
>> So, what I didnt follow is why should sm8450 use PP_BLK_TE Vs sm8550
>> should use PP_BLK_DIPHER?
>>
>> Atleast for those two, both should be using PP_BLK_DIPHER.
>>
>> Thats what I was trying to note here.
>>
>> This isnt even right as there is no PP_BLK_TE in sm8450.
> 
> SM8450 doesn't use PP_BLK_TE (TE2) anymore since the second patch in
> this series.  If you think it should use the DITHER (not DIPHER!) macro
> instead of the regular PP_BLK with a size of 0xd4, we can do that in
> another patch as that's not strictly related to this series.
> 

Yes, thanks for pointing the TE2 was removed in the prev patch of this 
series for sm8450. I was just focusing too much on this patch.

And Yes, I think we should use the DIPHER ..... oh sorry .... DITHER ;)

Yes, it can go as a different series, like I already wrote many times in 
this.

But atleast now, someone will remember to do it.

> Note that that's the only difference between these macros.  The size
> becomes 0 but the .features mask is the same (SM8450 uses
> PINGPONG_SM8150_MASK).
> 
> These patches are anyway already distracting from my series, but were
> easier to do in one go as I was touching the PP and INTF catalog blocks
> regardless.
> 
> While at it, perhaps we should check if the version and offset for the
> DITHER block are correct?  SM8450 uses SDM845 sblk definitions.
> 

Yes I already checked. the version and offset of dither are same between 
sm8450 and sm8550.

> - Marijn
> 
>>>>> Now, whether we should have the features contain subblock flags rather
>>>>> than just scanning for their id's or presence in the subblocks is a
>>>>> different discussion / cleanup we should have.
>>>>>
>>>>
>>>> Yes, separate patch and hence I gave R-b on this one. But had to leave
>>>> this comment to not lose context.
>>>
>>> Fwiw this is a different suggestion: we already have these flags in the
>>> sub-block `.id` field so there seems to be no reason to duplicate info
>>> in the top-level `.features` field, deduplicating some info and
>>> simplifying some defines.
>>>
>>> - Marijn
>>>
>>>>> - Marijn
>>>>>
>>>>>>> -	PP_BLK_DIPHER("pingpong_0", PINGPONG_0, 0x69000, MERGE_3D_0, sc7280_pp_sblk,
>>>>>>> +	PP_BLK_DITHER("pingpong_0", PINGPONG_0, 0x69000, MERGE_3D_0, sc7280_pp_sblk,
>>>>>>>      			DPU_IRQ_IDX(MDP_SSPP_TOP0_INTR, 8),
>>>>>>>      			-1),
>>>>>>> -	PP_BLK_DIPHER("pingpong_1", PINGPONG_1, 0x6a000, MERGE_3D_0, sc7280_pp_sblk,
>>>>>>> +	PP_BLK_DITHER("pingpong_1", PINGPONG_1, 0x6a000, MERGE_3D_0, sc7280_pp_sblk,
>>>>>>>      			DPU_IRQ_IDX(MDP_SSPP_TOP0_INTR, 9),
>>>>>>>      			-1),
>>>>>>> -	PP_BLK_DIPHER("pingpong_2", PINGPONG_2, 0x6b000, MERGE_3D_1, sc7280_pp_sblk,
>>>>>>> +	PP_BLK_DITHER("pingpong_2", PINGPONG_2, 0x6b000, MERGE_3D_1, sc7280_pp_sblk,
>>>>>>>      			DPU_IRQ_IDX(MDP_SSPP_TOP0_INTR, 10),
>>>>>>>      			-1),
>>>>>>> -	PP_BLK_DIPHER("pingpong_3", PINGPONG_3, 0x6c000, MERGE_3D_1, sc7280_pp_sblk,
>>>>>>> +	PP_BLK_DITHER("pingpong_3", PINGPONG_3, 0x6c000, MERGE_3D_1, sc7280_pp_sblk,
>>>>>>>      			DPU_IRQ_IDX(MDP_SSPP_TOP0_INTR, 11),
>>>>>>>      			-1),
>>>>>>> -	PP_BLK_DIPHER("pingpong_4", PINGPONG_4, 0x6d000, MERGE_3D_2, sc7280_pp_sblk,
>>>>>>> +	PP_BLK_DITHER("pingpong_4", PINGPONG_4, 0x6d000, MERGE_3D_2, sc7280_pp_sblk,
>>>>>>>      			DPU_IRQ_IDX(MDP_SSPP_TOP0_INTR2, 30),
>>>>>>>      			-1),
>>>>>>> -	PP_BLK_DIPHER("pingpong_5", PINGPONG_5, 0x6e000, MERGE_3D_2, sc7280_pp_sblk,
>>>>>>> +	PP_BLK_DITHER("pingpong_5", PINGPONG_5, 0x6e000, MERGE_3D_2, sc7280_pp_sblk,
>>>>>>>      			DPU_IRQ_IDX(MDP_SSPP_TOP0_INTR2, 31),
>>>>>>>      			-1),
>>>>>>> -	PP_BLK_DIPHER("pingpong_6", PINGPONG_6, 0x66000, MERGE_3D_3, sc7280_pp_sblk,
>>>>>>> +	PP_BLK_DITHER("pingpong_6", PINGPONG_6, 0x66000, MERGE_3D_3, sc7280_pp_sblk,
>>>>>>>      			-1,
>>>>>>>      			-1),
>>>>>>> -	PP_BLK_DIPHER("pingpong_7", PINGPONG_7, 0x66400, MERGE_3D_3, sc7280_pp_sblk,
>>>>>>> +	PP_BLK_DITHER("pingpong_7", PINGPONG_7, 0x66400, MERGE_3D_3, sc7280_pp_sblk,
>>>>>>>      			-1,
>>>>>>>      			-1),
>>>>>>>      };
>>>>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
>>>>>>> index 03f162af1a50..ca8a02debda9 100644
>>>>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
>>>>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
>>>>>>> @@ -491,7 +491,7 @@ static const struct dpu_pingpong_sub_blks sc7280_pp_sblk = {
>>>>>>>      	.len = 0x20, .version = 0x20000},
>>>>>>>      };
>>>>>>>      
>>>>>>> -#define PP_BLK_DIPHER(_name, _id, _base, _merge_3d, _sblk, _done, _rdptr) \
>>>>>>> +#define PP_BLK_DITHER(_name, _id, _base, _merge_3d, _sblk, _done, _rdptr) \
>>>>>>>      	{\
>>>>>>>      	.name = _name, .id = _id, \
>>>>>>>      	.base = _base, .len = 0, \
>>>>>>>