linux-kernel - Re: [PATCH 06/11] drm/msm/disp/dpu1: Add DSC support in hw

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Date:   Fri, 30 Jul 2021 01:15:09 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
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>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org
Subject: Re: [PATCH 06/11] drm/msm/disp/dpu1: Add DSC support in hw_ctl

On 15/07/2021 09:51, Vinod Koul wrote:
> Later gens of hardware have DSC bits moved to hw_ctl, so configure these
> bits so that DSC would work there as well
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 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 2d4645e01ebf..aeea6add61ee 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> @@ -25,6 +25,8 @@
>   #define   CTL_MERGE_3D_ACTIVE           0x0E4
>   #define   CTL_INTF_ACTIVE               0x0F4
>   #define   CTL_MERGE_3D_FLUSH            0x100
> +#define   CTL_DSC_ACTIVE                0x0E8
> +#define   CTL_DSC_FLUSH                0x104
>   #define   CTL_INTF_FLUSH                0x110
>   #define   CTL_INTF_MASTER               0x134
>   #define   CTL_FETCH_PIPE_ACTIVE         0x0FC
> @@ -34,6 +36,7 @@
>   
>   #define DPU_REG_RESET_TIMEOUT_US        2000
>   #define  MERGE_3D_IDX   23
> +#define  DSC_IDX        22
>   #define  INTF_IDX       31
>   #define CTL_INVALID_BIT                 0xffff
>   
> @@ -120,6 +123,7 @@ static u32 dpu_hw_ctl_get_pending_flush(struct dpu_hw_ctl *ctx)
>   
>   static inline void dpu_hw_ctl_trigger_flush_v1(struct dpu_hw_ctl *ctx)
>   {
> +	DPU_REG_WRITE(&ctx->hw, CTL_DSC_FLUSH, BIT(0) | BIT(1) | BIT(2) | BIT(3));

Please pass DSC indices using intf cfg and use them to configure 
register writes.

>   
>   	if (ctx->pending_flush_mask & BIT(MERGE_3D_IDX))
>   		DPU_REG_WRITE(&ctx->hw, CTL_MERGE_3D_FLUSH,
> @@ -128,7 +132,7 @@ static inline void dpu_hw_ctl_trigger_flush_v1(struct dpu_hw_ctl *ctx)
>   		DPU_REG_WRITE(&ctx->hw, CTL_INTF_FLUSH,
>   				ctx->pending_intf_flush_mask);
>   
> -	DPU_REG_WRITE(&ctx->hw, CTL_FLUSH, ctx->pending_flush_mask);
> +	DPU_REG_WRITE(&ctx->hw, CTL_FLUSH, ctx->pending_flush_mask |  BIT(DSC_IDX));

Only if DSCs are used

>   }
>   
>   static inline void dpu_hw_ctl_trigger_flush(struct dpu_hw_ctl *ctx)
> @@ -507,6 +511,7 @@ 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));
> +	DPU_REG_WRITE(c, CTL_DSC_ACTIVE, BIT(0) | BIT(1) | BIT(2) | BIT(3));

And here

>   }
>   
>   static void dpu_hw_ctl_intf_cfg(struct dpu_hw_ctl *ctx,
> 


-- 
With best wishes
Dmitry