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Date:   Tue, 25 Apr 2023 08:54:35 +0200
From:   Marijn Suijten <marijn.suijten@somainline.org>
To:     Abhinav Kumar <quic_abhinavk@quicinc.com>
Cc:     dri-devel@lists.freedesktop.org,
        Jordan Crouse <jordan@cosmicpenguin.net>,
        AngeloGioacchino Del Regno 
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        Chandan Uddaraju <chandanu@codeaurora.org>,
        Archit Taneja <architt@codeaurora.org>,
        Robert Foss <rfoss@kernel.org>,
        Rob Clark <robdclark@gmail.com>,
        Kuogee Hsieh <quic_khsieh@quicinc.com>,
        Rajesh Yadav <ryadav@codeaurora.org>,
        linux-arm-msm@vger.kernel.org, Adam Skladowski <a39.skl@gmail.com>,
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        Jeykumar Sankaran <jsanka@codeaurora.org>,
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        Sravanthi Kollukuduru <skolluku@codeaurora.org>
Subject: Re: [Freedreno] [PATCH v2 04/17] drm/msm/dpu: Fix PP_BLK_DIPHER ->
 DITHER typo
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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.

> > 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, \
> >>>