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

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Date:   Thu, 20 Jan 2022 02:12:51 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>,
        phone-devel@...r.kernel.org
Cc:     ~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>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Bernard <bernard@...o.com>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/dpu: Bind pingpong block to intf on active ctls
 in cmd encoder

On 22/12/2021 13:55, Marijn Suijten 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>

> ---
>   .../drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c  | 21 +++++++++++++++++++
>   1 file changed, 21 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..e0e08a874f07 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)

Nit: here we bind all interfaces, but later we unbind only master. Is 
this correct?

> +		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 +531,19 @@ 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 (dpu_encoder_phys_cmd_is_master(phys_enc)) {
> +		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;
>   }
>   


-- 
With best wishes
Dmitry