linux-kernel - Re: [PATCH] drm/msm/dpu: always program dsc active bits

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Date:   Tue, 11 Apr 2023 14:39:27 -0700
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>, <robdclark@...il.com>,
        <sean@...rly.run>, <swboyd@...omium.org>, <dianders@...omium.org>,
        <vkoul@...nel.org>, <daniel@...ll.ch>, <airlied@...il.com>,
        <agross@...nel.org>, <dmitry.baryshkov@...aro.org>,
        <andersson@...nel.org>
CC:     <quic_sbillaka@...cinc.com>, <freedreno@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm/dpu: always program dsc active bits



On 4/11/2023 2:04 PM, Kuogee Hsieh wrote:
> In current code, the dsc active bits are set only if the cfg->dsc is set.
> However, for displays which are hot-pluggable, there can be a use-case
> of disconnecting a DSC supported sink and connecting a non-DSC sink.
> 
> For those cases we need to clear DSC active bits during teardown.
> 
> Fixes: ede3c6bb00c ("drm/msm/disp/dpu1: Add DSC support in hw_ctl")

Again, wrong fixes tag,

Fixes: 77f6da90487c ("drm/msm/disp/dpu1: Add DSC support in hw_ctl")

> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 7 +++----
>   1 file changed, 3 insertions(+), 4 deletions(-)
> 
> 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 bbdc95c..88e4efe 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> @@ -541,10 +541,9 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
>   	if (cfg->merge_3d)
>   		DPU_REG_WRITE(c, CTL_MERGE_3D_ACTIVE,
>   			      BIT(cfg->merge_3d - MERGE_3D_0));
> -	if (cfg->dsc) {
> -		DPU_REG_WRITE(&ctx->hw, CTL_FLUSH, DSC_IDX);
> -		DPU_REG_WRITE(c, CTL_DSC_ACTIVE, cfg->dsc);
> -	}
> +
> +	DPU_REG_WRITE(&ctx->hw, CTL_FLUSH, DSC_IDX);
> +	DPU_REG_WRITE(c, CTL_DSC_ACTIVE, cfg->dsc);
>   }
>   
>   static void dpu_hw_ctl_intf_cfg(struct dpu_hw_ctl *ctx,

But, otherwise seems fine and a valid bug fix.

Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>