linux-kernel - Re: [PATCH] drm/mediatek: Optimize functions which do not need to return

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Date:   Sat, 17 Oct 2020 10:50:58 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     Bernard Zhao <bernard@...o.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        opensource.kernel@...o.com
Subject: Re: [PATCH] drm/mediatek: Optimize functions which do not need to return

Bernard Zhao <bernard@...o.com> 於 2020年10月13日 週二 下午4:55寫道：
>
> Function mtk_hdmi_aud_set_input always return 0, no need to
> keep the return value. Functions mtk_hdmi_aud_enable_packet &
> mtk_hdmi_aud_on_off_hw_ncts are the same, these two functions
> just call next functions. Maybe it`s a bit better to just call
> the inner function.

Reviewed-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>

>
> Signed-off-by: Bernard Zhao <bernard@...o.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 27 +++++++--------------------
>  1 file changed, 7 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index a97725680d4e..f1d987df0550 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -870,19 +870,8 @@ static void mtk_hdmi_video_set_display_mode(struct mtk_hdmi *hdmi,
>         mtk_hdmi_hw_msic_setting(hdmi, mode);
>  }
>
> -static int mtk_hdmi_aud_enable_packet(struct mtk_hdmi *hdmi, bool enable)
> -{
> -       mtk_hdmi_hw_send_aud_packet(hdmi, enable);
> -       return 0;
> -}
>
> -static int mtk_hdmi_aud_on_off_hw_ncts(struct mtk_hdmi *hdmi, bool on)
> -{
> -       mtk_hdmi_hw_ncts_enable(hdmi, on);
> -       return 0;
> -}
> -
> -static int mtk_hdmi_aud_set_input(struct mtk_hdmi *hdmi)
> +static void mtk_hdmi_aud_set_input(struct mtk_hdmi *hdmi)
>  {
>         enum hdmi_aud_channel_type chan_type;
>         u8 chan_count;
> @@ -912,8 +901,6 @@ static int mtk_hdmi_aud_set_input(struct mtk_hdmi *hdmi)
>         chan_count = mtk_hdmi_aud_get_chnl_count(chan_type);
>         mtk_hdmi_hw_aud_set_i2s_chan_num(hdmi, chan_type, chan_count);
>         mtk_hdmi_hw_aud_set_input_type(hdmi, hdmi->aud_param.aud_input_type);
> -
> -       return 0;
>  }
>
>  static int mtk_hdmi_aud_set_src(struct mtk_hdmi *hdmi,
> @@ -921,7 +908,7 @@ static int mtk_hdmi_aud_set_src(struct mtk_hdmi *hdmi,
>  {
>         unsigned int sample_rate = hdmi->aud_param.codec_params.sample_rate;
>
> -       mtk_hdmi_aud_on_off_hw_ncts(hdmi, false);
> +       mtk_hdmi_hw_ncts_enable(hdmi, false);
>         mtk_hdmi_hw_aud_src_disable(hdmi);
>         mtk_hdmi_clear_bits(hdmi, GRL_CFG2, CFG2_ACLK_INV);
>
> @@ -959,7 +946,7 @@ static int mtk_hdmi_aud_output_config(struct mtk_hdmi *hdmi,
>                                       struct drm_display_mode *display_mode)
>  {
>         mtk_hdmi_hw_aud_mute(hdmi);
> -       mtk_hdmi_aud_enable_packet(hdmi, false);
> +       mtk_hdmi_hw_send_aud_packet(hdmi, false);
>
>         mtk_hdmi_aud_set_input(hdmi);
>         mtk_hdmi_aud_set_src(hdmi, display_mode);
> @@ -968,8 +955,8 @@ static int mtk_hdmi_aud_output_config(struct mtk_hdmi *hdmi,
>
>         usleep_range(50, 100);
>
> -       mtk_hdmi_aud_on_off_hw_ncts(hdmi, true);
> -       mtk_hdmi_aud_enable_packet(hdmi, true);
> +       mtk_hdmi_hw_ncts_enable(hdmi, true);
> +       mtk_hdmi_hw_send_aud_packet(hdmi, true);
>         mtk_hdmi_hw_aud_unmute(hdmi);
>         return 0;
>  }
> @@ -1097,13 +1084,13 @@ static int mtk_hdmi_output_init(struct mtk_hdmi *hdmi)
>
>  static void mtk_hdmi_audio_enable(struct mtk_hdmi *hdmi)
>  {
> -       mtk_hdmi_aud_enable_packet(hdmi, true);
> +       mtk_hdmi_hw_send_aud_packet(hdmi, true);
>         hdmi->audio_enable = true;
>  }
>
>  static void mtk_hdmi_audio_disable(struct mtk_hdmi *hdmi)
>  {
> -       mtk_hdmi_aud_enable_packet(hdmi, false);
> +       mtk_hdmi_hw_send_aud_packet(hdmi, false);
>         hdmi->audio_enable = false;
>  }
>
> --
> 2.28.0
>