linux-kernel - Re: [PATCH v2] drm/amd/display: fix DSC related non-x86/PPC64 compilation issue

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Date:   Thu, 11 Aug 2022 14:34:25 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Hamza Mahfooz <hamza.mahfooz@....com>
Cc:     linux-kernel@...r.kernel.org,
        Anders Roxell <anders.roxell@...aro.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Leo Li <sunpeng.li@....com>, dri-devel@...ts.freedesktop.org,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Roman Li <Roman.Li@....com>, amd-gfx@...ts.freedesktop.org,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Fangzhi Zuo <Jerry.Zuo@....com>,
        hersen wu <hersenxs.wu@....com>,
        Daniel Vetter <daniel@...ll.ch>, Wayne Lin <Wayne.Lin@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Harry Wentland <harry.wentland@....com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: Re: [PATCH v2] drm/amd/display: fix DSC related non-x86/PPC64
 compilation issue

On Thu, Aug 11, 2022 at 2:00 PM Hamza Mahfooz <hamza.mahfooz@....com> wrote:
>
> Need to protect DSC code with CONFIG_DRM_AMD_DC_DCN.
> Fixes the following build errors on arm64:
> ERROR: modpost: "dc_dsc_get_policy_for_timing" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
> ERROR: modpost: "dc_dsc_compute_bandwidth_range" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
>
> Fixes: 0087990a9f57 ("drm/amd/display: consider DSC pass-through during mode validation")
> Reported-by: Anders Roxell <anders.roxell@...aro.org>
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@....com>

Reviewed-by: Alex Deucher <alexander.deucher@....com>

> ---
> v2: Fix WERROR build failure by guarding unused variables
> ---
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c  | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> index ef6c94cd852b..ce6929224a6e 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> @@ -1387,8 +1387,6 @@ bool pre_validate_dsc(struct drm_atomic_state *state,
>         return (ret == 0);
>  }
>
> -#endif
> -
>  static unsigned int kbps_from_pbn(unsigned int pbn)
>  {
>         unsigned int kbps = pbn;
> @@ -1416,17 +1414,19 @@ static bool is_dsc_common_config_possible(struct dc_stream_state *stream,
>
>         return bw_range->max_target_bpp_x16 && bw_range->min_target_bpp_x16;
>  }
> +#endif /* CONFIG_DRM_AMD_DC_DCN */
>
>  enum dc_status dm_dp_mst_is_port_support_mode(
>         struct amdgpu_dm_connector *aconnector,
>         struct dc_stream_state *stream)
>  {
> +       int bpp, pbn, branch_max_throughput_mps = 0;
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
>         struct dc_link_settings cur_link_settings;
>         unsigned int end_to_end_bw_in_kbps = 0;
>         unsigned int upper_link_bw_in_kbps = 0, down_link_bw_in_kbps = 0;
>         unsigned int max_compressed_bw_in_kbps = 0;
>         struct dc_dsc_bw_range bw_range = {0};
> -       int bpp, pbn, branch_max_throughput_mps = 0;
>
>         /*
>          * check if the mode could be supported if DSC pass-through is supported
> @@ -1461,13 +1461,16 @@ enum dc_status dm_dp_mst_is_port_support_mode(
>                         return DC_FAIL_BANDWIDTH_VALIDATE;
>                 }
>         } else {
> +#endif
>                 /* check if mode could be supported within full_pbn */
>                 bpp = convert_dc_color_depth_into_bpc(stream->timing.display_color_depth) * 3;
>                 pbn = drm_dp_calc_pbn_mode(stream->timing.pix_clk_100hz / 10, bpp, false);
>
>                 if (pbn > aconnector->port->full_pbn)
>                         return DC_FAIL_BANDWIDTH_VALIDATE;
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
>         }
> +#endif
>
>         /* check is mst dsc output bandwidth branch_overall_throughput_0_mps */
>         switch (stream->timing.pixel_encoding) {
> --
> 2.37.1
>