linux-kernel - Re: [v2] drm/msm/disp/dpu1: set default group ID for CTL.

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Message-ID: <CAA8EJppXBC43=bWigTwQ-QkMsDVf829LRXokEBKcWJdHOoOezQ@mail.gmail.com>
Date:   Fri, 29 Oct 2021 16:07:32 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kalyan Thota <quic_kalyant@...cinc.com>
Cc:     y@...lcomm.com,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <dri-devel@...ts.freedesktop.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Rob Clark <robdclark@...il.com>,
        Douglas Anderson <dianders@...omium.org>,
        Krishna Manikandan <mkrishn@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>
Subject: Re: [v2] drm/msm/disp/dpu1: set default group ID for CTL.

On Fri, 29 Oct 2021 at 15:30, Kalyan Thota <quic_kalyant@...cinc.com> wrote:
>
> New required programming in CTL for SC7280. Group ID informs
> HW of which VM owns that CTL. Force this group ID to
> default/disabled until virtualization support is enabled in SW.
>
> Changes in v1:
>  - Fix documentation and add descritpion for the change (Stephen)
>
> Signed-off-by: Kalyan Thota <quic_kalyant@...cinc.com>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c | 2 +-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 5 ++++-
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c     | 8 ++++++++
>  3 files changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> index ce6f32a..283605c 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> @@ -45,7 +45,7 @@
>         (PINGPONG_SDM845_MASK | BIT(DPU_PINGPONG_TE2))
>
>  #define CTL_SC7280_MASK \
> -       (BIT(DPU_CTL_ACTIVE_CFG) | BIT(DPU_CTL_FETCH_ACTIVE))
> +       (BIT(DPU_CTL_ACTIVE_CFG) | BIT(DPU_CTL_FETCH_ACTIVE) | BIT(DPU_CTL_VM_CFG))
>
>  #define MERGE_3D_SM8150_MASK (0)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> index 4ade44b..31af04a 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> @@ -179,13 +179,16 @@ enum {
>
>  /**
>   * CTL sub-blocks
> - * @DPU_CTL_SPLIT_DISPLAY       CTL supports video mode split display
> + * @DPU_CTL_SPLIT_DISPLAY:     CTL supports video mode split display
> + * @DPU_CTL_FETCH_ACTIVE:      Active CTL for fetch HW (SSPPs)
> + * @DPU_CTL_VM_CFG:            CTL config to support multiple VMs
>   * @DPU_CTL_MAX
>   */
>  enum {
>         DPU_CTL_SPLIT_DISPLAY = 0x1,
>         DPU_CTL_ACTIVE_CFG,
>         DPU_CTL_FETCH_ACTIVE,
> +       DPU_CTL_VM_CFG,
>         DPU_CTL_MAX
>  };
>
> 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 64740ddb..02da9ec 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> @@ -36,6 +36,7 @@
>  #define  MERGE_3D_IDX   23
>  #define  INTF_IDX       31
>  #define CTL_INVALID_BIT                 0xffff
> +#define CTL_DEFAULT_GROUP_ID           0xf
>
>  static const u32 fetch_tbl[SSPP_MAX] = {CTL_INVALID_BIT, 16, 17, 18, 19,
>         CTL_INVALID_BIT, CTL_INVALID_BIT, CTL_INVALID_BIT, CTL_INVALID_BIT, 0,
> @@ -498,6 +499,13 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
>         u32 intf_active = 0;
>         u32 mode_sel = 0;
>
> +       /* CTL_TOP[31:28] carries group_id to collate CTL paths
> +        * per VM. Explicitly disable it until VM support is
> +        * added in SW. Power on reset value is not disable.
> +        */
> +       if ((test_bit(DPU_CTL_VM_CFG, &ctx->caps->features)))
> +               mode_sel = CTL_DEFAULT_GROUP_ID  << 28;
> +
>         if (cfg->intf_mode_sel == DPU_CTL_MODE_SEL_CMD)
>                 mode_sel |= BIT(17);
>
> --
> 2.7.4
>


-- 
With best wishes
Dmitry