linux-kernel - Re: [PATCH v2] drm/msm/dpu: Bind pingpong block to intf on active ctls in cmd encoder

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Date:   Wed, 23 Feb 2022 14:57:02 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
Cc:     phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Pavel Dubrova <pashadubrova@...il.com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Bernard <bernard@...o.com>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/msm/dpu: Bind pingpong block to intf on active
 ctls in cmd encoder

On Wed, 23 Feb 2022 at 14:40, Marijn Suijten
<marijn.suijten@...ainline.org> wrote:
>
> As per the specification of DPU_CTL_ACTIVE_CFG the configuration of
> active blocks should be proactively specified, and the pingpong block is
> no different.
>
> The downstream display driver [1] confirms this by also calling
> bind_pingpong_blk on CTL_ACTIVE_CFG.  Note that this else-if is always
> entered, as setup_intf_cfg - unlike this mainline dpu driver that
> combines both behind the same function pointer - is left NULL in favour
> of using setup_intf_cfg_v1 when CTL_ACTIVE_CFG is set.
>
> This solves continuous timeouts on at least the Qualcomm sm6125 SoC:
>
>     [drm:dpu_encoder_frame_done_timeout:2091] [dpu error]enc31 frame done timeout
>     [drm:_dpu_encoder_phys_cmd_handle_ppdone_timeout.isra.0] *ERROR* id:31 pp:0 kickoff timeout 0 cnt 1 koff_cnt 1
>     [drm:dpu_encoder_phys_cmd_prepare_for_kickoff] *ERROR* failed wait_for_idle: id:31 ret:-110 pp:0
>
> In the same way this pingpong block should also be unbound followed by
> an interface flush when the encoder is disabled, according to the
> downstream display driver [2].
>
> [1]: https://source.codeaurora.org/quic/la/platform/vendor/opensource/display-drivers/tree/msm/sde/sde_encoder_phys_cmd.c?h=LA.UM.9.16.r1-08500-MANNAR.0#n167
> [2]: https://source.codeaurora.org/quic/la/platform/vendor/opensource/display-drivers/tree/msm/sde/sde_encoder.c?h=LA.UM.9.16.r1-08500-MANNAR.0#n2986
>
> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

As we are quite late in the development cycle, I'd delay this into the
next release, if you don't mind.

> ---
>
> Changes since v1:
> - Always unbind the pingpong block in dpu_encoder_phys_cmd_disable,
>   instead of only if this encoder is the master.
>
> v1: https://lore.kernel.org/lkml/20211222105513.44860-1-marijn.suijten@somainline.org/
>
>  .../drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c  | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> index 8e433af7aea4..1be01cbd960e 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> @@ -71,6 +71,13 @@ static void _dpu_encoder_phys_cmd_update_intf_cfg(
>         intf_cfg.stream_sel = cmd_enc->stream_sel;
>         intf_cfg.mode_3d = dpu_encoder_helper_get_3d_blend_mode(phys_enc);
>         ctl->ops.setup_intf_cfg(ctl, &intf_cfg);
> +
> +       /* setup which pp blk will connect to this intf */
> +       if (test_bit(DPU_CTL_ACTIVE_CFG, &ctl->caps->features) && phys_enc->hw_intf->ops.bind_pingpong_blk)
> +               phys_enc->hw_intf->ops.bind_pingpong_blk(
> +                               phys_enc->hw_intf,
> +                               true,
> +                               phys_enc->hw_pp->idx);
>  }
>
>  static void dpu_encoder_phys_cmd_pp_tx_done_irq(void *arg, int irq_idx)
> @@ -507,6 +514,7 @@ static void dpu_encoder_phys_cmd_disable(struct dpu_encoder_phys *phys_enc)
>  {
>         struct dpu_encoder_phys_cmd *cmd_enc =
>                 to_dpu_encoder_phys_cmd(phys_enc);
> +       struct dpu_hw_ctl *ctl;
>
>         if (!phys_enc->hw_pp) {
>                 DPU_ERROR("invalid encoder\n");
> @@ -523,6 +531,17 @@ static void dpu_encoder_phys_cmd_disable(struct dpu_encoder_phys *phys_enc)
>
>         if (phys_enc->hw_pp->ops.enable_tearcheck)
>                 phys_enc->hw_pp->ops.enable_tearcheck(phys_enc->hw_pp, false);
> +
> +       if (phys_enc->hw_intf->ops.bind_pingpong_blk) {
> +               phys_enc->hw_intf->ops.bind_pingpong_blk(
> +                               phys_enc->hw_intf,
> +                               false,
> +                               phys_enc->hw_pp->idx);
> +
> +               ctl = phys_enc->hw_ctl;
> +               ctl->ops.update_pending_flush_intf(ctl, phys_enc->intf_idx);
> +       }
> +
>         phys_enc->enable_state = DPU_ENC_DISABLED;
>  }
>
>
> base-commit: 3c30cf91b5ecc7272b3d2942ae0505dd8320b81c
> --
> 2.35.1
>


-- 
With best wishes
Dmitry