linux-kernel - Re: [PATCH -next] drm/amd/display: fix warning: ‘update_dsc_caps’ and ‘apply_dsc_policy_for

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Date:   Tue, 1 Jun 2021 22:10:27 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Baokun Li <libaokun1@...wei.com>
Cc:     "Wentland, Harry" <harry.wentland@....com>,
        "Leo (Sunpeng) Li" <sunpeng.li@....com>,
        "Deucher, Alexander" <alexander.deucher@....com>,
        Christian Koenig <christian.koenig@....com>,
        xinhui pan <Xinhui.Pan@....com>,
        Dave Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "Kazlauskas, Nicholas" <nicholas.kazlauskas@....com>,
        "Siqueira, Rodrigo" <Rodrigo.Siqueira@....com>,
        Aurabindo Pillai <aurabindo.pillai@....com>,
        Qingqing Zhuo <qingqing.zhuo@....com>,
        Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>,
        Nikola Cornij <nikola.cornij@....com>,
        Wayne Lin <Wayne.Lin@....com>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        YueHaibing <yuehaibing@...wei.com>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        yu kuai <yukuai3@...wei.com>, yangjihong1@...wei.com
Subject: Re: [PATCH -next] drm/amd/display: fix warning: ‘update_dsc_caps’ and ‘apply_dsc_policy_for_stream’ defined but not used

Applied.  Thanks!

On Tue, Jun 1, 2021 at 4:04 AM Baokun Li <libaokun1@...wei.com> wrote:
>
> Fixes gcc '-Wunused-function' warning:
>
> ‘update_dsc_caps’ and ‘apply_dsc_policy_for_stream’ are only used
> if 'CONFIG_DRM_AMD_DC_DCN' is defined,
>
> however, it's defined even if 'CONFIG_DRM_AMD_DC_DCN' is not defined.
> Thus gcc will report following warning
> if 'CONFIG_DRM_AMD_DC_DCN' is not defined:
>
> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:5572:13: warning:
> ‘apply_dsc_policy_for_stream’ defined but not used [-Wunused-function]
>
> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:5556:13: warning:
> ‘update_dsc_caps’ defined but not used [-Wunused-function]
>
> Thus move the definition of ‘update_dsc_caps’ and
> ‘apply_dsc_policy_for_stream’ inside define macro to fix it.
>
> Signed-off-by: Baokun Li <libaokun1@...wei.com>
> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index f0adfda32213..e0af394103aa 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -5553,6 +5553,7 @@ static void dm_enable_per_frame_crtc_master_sync(struct dc_state *context)
>         }
>  }
>
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
>  static void update_dsc_caps(struct amdgpu_dm_connector *aconnector,
>                                                         struct dc_sink *sink, struct dc_stream_state *stream,
>                                                         struct dsc_dec_dpcd_caps *dsc_caps)
> @@ -5560,12 +5561,10 @@ static void update_dsc_caps(struct amdgpu_dm_connector *aconnector,
>         stream->timing.flags.DSC = 0;
>
>         if (aconnector->dc_link && sink->sink_signal == SIGNAL_TYPE_DISPLAY_PORT) {
> -#if defined(CONFIG_DRM_AMD_DC_DCN)
>                 dc_dsc_parse_dsc_dpcd(aconnector->dc_link->ctx->dc,
>                                       aconnector->dc_link->dpcd_caps.dsc_caps.dsc_basic_caps.raw,
>                                       aconnector->dc_link->dpcd_caps.dsc_caps.dsc_branch_decoder_caps.raw,
>                                       dsc_caps);
> -#endif
>         }
>  }
>
> @@ -5578,7 +5577,6 @@ static void apply_dsc_policy_for_stream(struct amdgpu_dm_connector *aconnector,
>
>         link_bandwidth_kbps = dc_link_bandwidth_kbps(aconnector->dc_link,
>                                                         dc_link_get_link_cap(aconnector->dc_link));
> -#if defined(CONFIG_DRM_AMD_DC_DCN)
>         /* Set DSC policy according to dsc_clock_en */
>         dc_dsc_policy_set_enable_dsc_when_not_needed(
>                 aconnector->dsc_settings.dsc_force_enable == DSC_CLK_FORCE_ENABLE);
> @@ -5609,8 +5607,8 @@ static void apply_dsc_policy_for_stream(struct amdgpu_dm_connector *aconnector,
>
>         if (stream->timing.flags.DSC && aconnector->dsc_settings.dsc_bits_per_pixel)
>                 stream->timing.dsc_cfg.bits_per_pixel = aconnector->dsc_settings.dsc_bits_per_pixel;
> -#endif
>  }
> +#endif
>
>  static struct drm_display_mode *
>  get_highest_refresh_rate_mode(struct amdgpu_dm_connector *aconnector,
> --
> 2.31.1
>