linux-kernel - Re: [v12] drm/msm/disp/dpu1: add support for dspp sub block flush in sc7280

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Date:   Mon, 13 Feb 2023 10:11:15 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     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,
        swboyd@...omium.org, quic_vpolimer@...cinc.com,
        dmitry.baryshkov@...aro.org, quic_abhinavk@...cinc.com,
        marijn.suijten@...ainline.org
Subject: Re: [v12] drm/msm/disp/dpu1: add support for dspp sub block flush in sc7280

Hi,

On Fri, Jan 27, 2023 at 2:15 AM Kalyan Thota <quic_kalyant@...cinc.com> wrote:
>
> Flush mechanism for DSPP blocks has changed in sc7280 family, it
> allows individual sub blocks to be flushed in coordination with
> master flush control.
>
> Representation: master_flush && (PCC_flush | IGC_flush .. etc )
>
> This change adds necessary support for the above design.
>
> Changes in v1:
> - Few nits (Doug, Dmitry)
> - Restrict sub-block flush programming to dpu_hw_ctl file (Dmitry)
>
> Changes in v2:
> - Move the address offset to flush macro (Dmitry)
> - Separate ops for the sub block flush (Dmitry)
>
> Changes in v3:
> - Reuse the DPU_DSPP_xx enum instead of a new one (Dmitry)
>
> Changes in v4:
> - Use shorter version for unsigned int (Stephen)
>
> Changes in v5:
> - Spurious patch please ignore.
>
> Changes in v6:
> - Add SOB tag (Doug, Dmitry)
>
> Changes in v7:
> - Cache flush mask per dspp (Dmitry)
> - Few nits (Marijn)
>
> Changes in v8:
> - Few nits (Marijn)
>
> Changes in v9:
> - Use DSPP enum while accessing flush mask to make it readable (Dmitry)
> - Few nits (Dmitry)
>
> Changes in v10:
> - Fix white spaces in a separate patch (Dmitry)
>
> Changes in v11:
> - Define a macro for dspp flush selection (Marijn)
> - Few nits (Marijn)
>
> Changes in v12:
> - Minor comments (reorder macros and a condition) (Marijn)
>
> Signed-off-by: Kalyan Thota <quic_kalyant@...cinc.com>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c       |  2 +-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c |  5 ++-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h |  4 +++
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c     | 49 +++++++++++++++++++++++---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h     |  5 ++-
>  5 files changed, 58 insertions(+), 7 deletions(-)

There's a (trivial to resolve) merge conflict when applying this patch
against msm-next. I dunno if that means you should send a v13?

In any case, when using this patch together with the DSPP series [1]
the internal night light works on sc7280-herobrine based boards. Thus:

Tested-by: Douglas Anderson <dianders@...omium.org>


[1] https://lore.kernel.org/r/1676286704-818-1-git-send-email-quic_kalyant@quicinc.com/