linux-kernel - Re: [PATCH v12 01/10] drm/msm/dpu: set DSC flush bit correctly at MDP CTL flush register

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Message-ID: <d5e232d6-b789-a8c3-4ec5-7af0b9d8b9ae@linaro.org>
Date:   Mon, 22 May 2023 23:18:02 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>,
        dri-devel@...ts.freedesktop.org, robdclark@...il.com,
        sean@...rly.run, swboyd@...omium.org, dianders@...omium.org,
        vkoul@...nel.org, daniel@...ll.ch, airlied@...il.com,
        agross@...nel.org, andersson@...nel.org
Cc:     quic_abhinavk@...cinc.com, quic_jesszhan@...cinc.com,
        quic_sbillaka@...cinc.com, marijn.suijten@...ainline.org,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 01/10] drm/msm/dpu: set DSC flush bit correctly at MDP
 CTL flush register

On 22/05/2023 22:30, Kuogee Hsieh wrote:
> DSC flush bit is the bit 22 of CTL flush register. BIT(22) is expected
> to be written to CTL flush register to indicates that DSC is ready for
> flush. However 0x22 (BIT(1) and BIT(5)) was written mistakenly at current

DSC_IDX is 22, not 0x22.

> implementation. Fix this problem by writing BIT(22) to CTL flush register
> for DSC to work properly.
> 
> Changes in V12:
> -- split this patch out of "separate DSC flush update out of interface"
> 
> 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 | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> 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 4f7cfa9..69d0ea2 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> @@ -525,7 +525,7 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
>   		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(&ctx->hw, CTL_FLUSH, BIT(DSC_IDX));
>   		DPU_REG_WRITE(c, CTL_DSC_ACTIVE, cfg->dsc);
>   	}
>   }

-- 
With best wishes
Dmitry