linux-kernel - Re: [REPOST PATCH v4 08/13] drm/msm/disp/dpu1: Don't use DSC with mode

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Date:   Wed, 16 Feb 2022 19:11:27 -0800
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Vinod Koul <vkoul@...nel.org>, Rob Clark <robdclark@...il.com>
CC:     <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Marek <jonathan@...ek.ca>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>
Subject: Re: [REPOST PATCH v4 08/13] drm/msm/disp/dpu1: Don't use DSC with
 mode_3d



On 2/10/2022 2:34 AM, Vinod Koul wrote:
> We cannot enable mode_3d when we are using the DSC. So pass
> configuration to detect DSC is enabled and not enable mode_3d
> when we are using DSC
> 
> We add a helper dpu_encoder_helper_get_dsc() to detect dsc
> enabled and pass this to .setup_intf_cfg()
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>

We should not use 3D mux only when we use DSC merge topology.
I agree that today we use only 2-2-1 topology for DSC which means its 
using DSC merge.

But generalizing that 3D mux should not be used for DSC is not right.

You can detect DSC merge by checking if there are two encoders and one 
interface in the topology and if so, you can disable 3D mux.

> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c | 4 ++++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 4 ++++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c           | 7 ++++++-
>   3 files changed, 14 insertions(+), 1 deletion(-)
> 
> 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 34a6940d12c5..ed37a4c21596 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
> @@ -70,6 +70,10 @@ static void _dpu_encoder_phys_cmd_update_intf_cfg(
>   	intf_cfg.intf_mode_sel = DPU_CTL_MODE_SEL_CMD;
>   	intf_cfg.stream_sel = cmd_enc->stream_sel;
>   	intf_cfg.mode_3d = dpu_encoder_helper_get_3d_blend_mode(phys_enc);
> +	intf_cfg.dsc = dpu_encoder_helper_get_dsc(phys_enc);
> +	if (intf_cfg.dsc)
> +		intf_cfg.mode_3d = 0;
> +
>   	ctl->ops.setup_intf_cfg(ctl, &intf_cfg);
>   }
>   
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> index ddd9d89cd456..218009855fca 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> @@ -284,6 +284,10 @@ static void dpu_encoder_phys_vid_setup_timing_engine(
>   	intf_cfg.intf_mode_sel = DPU_CTL_MODE_SEL_VID;
>   	intf_cfg.stream_sel = 0; /* Don't care value for video mode */
>   	intf_cfg.mode_3d = dpu_encoder_helper_get_3d_blend_mode(phys_enc);
> +	intf_cfg.dsc = dpu_encoder_helper_get_dsc(phys_enc);
> +	if (intf_cfg.dsc)
> +		intf_cfg.mode_3d = 0;
> +
>   	if (phys_enc->hw_pp->merge_3d)
>   		intf_cfg.merge_3d = phys_enc->hw_pp->merge_3d->idx;
>   
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> index 49659165cea8..6d5268b7da90 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> @@ -536,7 +536,12 @@ static void dpu_hw_ctl_intf_cfg(struct dpu_hw_ctl *ctx,
>   
>   	intf_cfg |= (cfg->intf & 0xF) << 4;
>   
> -	if (cfg->mode_3d) {
> +	/* In DSC we can't set merge, so check for dsc and complain */
> +	if (cfg->mode_3d && cfg->dsc)
> +		pr_err("DPU1: DSC and Merge 3D both are set!! it may not work\n");
> +
> +	/* set merge only when dsc is not set */
> +	if (cfg->mode_3d && !cfg->dsc) {
>   		intf_cfg |= BIT(19);
>   		intf_cfg |= (cfg->mode_3d - 0x1) << 20;
>   	}