[PATCH] drm/amd/pm: only poweron/off vcn/jpeg when they are valid.

[Quan, Evan]

[AMD Official Use Only - General]

> -----Original Message-----
> From: Zhang, Yifan <Yifan1.Zhang at amd.com>
> Sent: Thursday, August 31, 2023 2:10 PM
> To: amd-gfx at lists.freedesktop.org
> Cc: Quan, Evan <Evan.Quan at amd.com>; Ma, Li <Li.Ma at amd.com>; Zhang,
> Yifan <Yifan1.Zhang at amd.com>
> Subject: [PATCH] drm/amd/pm: only poweron/off vcn/jpeg when they are
> valid.
>
> If vcn is disabled in kernel parameters, don't touch vcn,
> otherwise it may cause vcn hang.
>
> Signed-off-by: Yifan Zhang <yifan1.zhang at amd.com>
> ---
>  drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 31
> ++++++++++++++++++++---
>  1 file changed, 27 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> index f005a90c35af..f5e7ce011cab 100644
> --- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> +++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> @@ -1454,6 +1454,21 @@ static int smu_start_smc_engine(struct
> smu_context *smu)
>       return ret;
>  }
>
> +static bool is_vcn_enabled(struct amdgpu_device *adev)
> +{
> +     int i;
> +
> +     for (i = 0; i < adev->num_ip_blocks; i++) {
> +             if ((adev->ip_blocks[i].version->type ==
> AMD_IP_BLOCK_TYPE_VCN ||
> +                     adev->ip_blocks[i].version->type ==
> AMD_IP_BLOCK_TYPE_JPEG) &&
> +                     !adev->ip_blocks[i].status.valid)
> +
> +                     return false;
> +     }
> +
> +     return true;
> +}
> +
>  static int smu_hw_init(void *handle)
>  {
>       int ret;
> @@ -1475,8 +1490,14 @@ static int smu_hw_init(void *handle)
>               ret = smu_set_gfx_imu_enable(smu);
>               if (ret)
>                       return ret;
> -             smu_dpm_set_vcn_enable(smu, true);
> -             smu_dpm_set_jpeg_enable(smu, true);
> +             /*
> +              * don't poweron vcn/jpeg when they are skipped.
> +              */
> +             if (is_vcn_enabled(adev)) {
> +                     dev_info(adev->dev, "yep, vcn are valid\n");
> +                     smu_dpm_set_vcn_enable(smu, true);
> +                     smu_dpm_set_jpeg_enable(smu, true);
> +             }
Better to move the "is_vcn_enabled" check into `smu_dpm_set_vcn/jpeg_enable`. That will make code more tidy.
Also, the "dev_info" here is obviously not needed.

Evan
>               smu_set_gfx_cgpg(smu, true);
>       }
>
> @@ -1651,8 +1672,10 @@ static int smu_hw_fini(void *handle)
>       if (amdgpu_sriov_vf(adev) && !amdgpu_sriov_is_pp_one_vf(adev))
>               return 0;
>
> -     smu_dpm_set_vcn_enable(smu, false);
> -     smu_dpm_set_jpeg_enable(smu, false);
> +     if (is_vcn_enabled(adev)) {
> +             smu_dpm_set_vcn_enable(smu, false);
> +             smu_dpm_set_jpeg_enable(smu, false);
> +     }
>
>       adev->vcn.cur_state = AMD_PG_STATE_GATE;
>       adev->jpeg.cur_state = AMD_PG_STATE_GATE;
> --
> 2.37.3