linux-kernel - Re: [PATCH v2 7/7] drm/mediatek: mtk

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Date:   Tue, 3 Aug 2021 07:21:49 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Collabora Kernel ML <kernel@...labora.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Eizan Miyamoto <eizan@...omium.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jitao Shi <jitao.shi@...iatek.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 7/7] drm/mediatek: mtk_dsi: Reset the dsi0 hardware

Hi, Enric:

Enric Balletbo i Serra <enric.balletbo@...labora.com> 於 2021年7月14日 週三 下午6:12寫道：
>
> Reset dsi0 HW to default when power on. This prevents to have different
> settingbetween the bootloader and the kernel.
>
> As not all Mediatek boards have the reset consumer configured in their
> board description, also is not needed on all of them, the reset is optional,
> so the change is compatible with all boards.

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

>
> Cc: Jitao Shi <jitao.shi@...iatek.com>
> Suggested-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
>
> (no changes since v1)
>
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index ae403c67cbd9..d8b81e2ab841 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -11,6 +11,7 @@
>  #include <linux/of_platform.h>
>  #include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
> +#include <linux/reset.h>
>
>  #include <video/mipi_display.h>
>  #include <video/videomode.h>
> @@ -980,8 +981,10 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
>         struct mtk_dsi *dsi = dev_get_drvdata(dev);
>
>         ret = mtk_dsi_encoder_init(drm, dsi);
> +       if (ret)
> +               return ret;
>
> -       return ret;
> +       return device_reset_optional(dev);
>  }
>
>  static void mtk_dsi_unbind(struct device *dev, struct device *master,
> --
> 2.30.2
>