linux-kernel - Re: [PATCH v11 11/12] drm/mediatek: dpi: Only enable dpi after the bridge is enabled

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Message-ID: <9adfb4b98e505c10469395bf3038010024ab86fd.camel@mediatek.com>
Date:   Tue, 14 Jun 2022 14:24:29 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Bo-Chen Chen <rex-bc.chen@...iatek.com>, <chunkuang.hu@...nel.org>,
        <p.zabel@...gutronix.de>, <daniel@...ll.ch>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <matthias.bgg@...il.com>,
        <airlied@...ux.ie>
CC:     <msp@...libre.com>, <granquet@...libre.com>,
        <jitao.shi@...iatek.com>, <wenst@...omium.org>,
        <angelogioacchino.delregno@...labora.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v11 11/12] drm/mediatek: dpi: Only enable dpi after the
 bridge is enabled

Hi, Bo-Chen:

On Mon, 2022-06-13 at 14:48 +0800, Bo-Chen Chen wrote:
> From: Guillaume Ranquet <granquet@...libre.com>
> 
> Enabling the dpi too early causes glitches on screen.
> 
> Move the call to mtk_dpi_enable() at the end of the bridge_enable
> callback to ensure everything is setup properly before enabling dpi.

This seems a bug fix, so add Fixes tag on this patch.

Regards,
CK

> 
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 08c8f21b4421..9668bd5dd14a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -480,7 +480,6 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
>  	if (dpi->pinctrl && dpi->pins_dpi)
>  		pinctrl_select_state(dpi->pinctrl, dpi->pins_dpi);
>  
> -	mtk_dpi_enable(dpi);
>  	return 0;
>  
>  err_pixel:
> @@ -726,6 +725,7 @@ static void mtk_dpi_bridge_enable(struct
> drm_bridge *bridge)
>  
>  	mtk_dpi_power_on(dpi);
>  	mtk_dpi_set_display_mode(dpi, &dpi->mode);
> +	mtk_dpi_enable(dpi);
>  }
>  
>  static enum drm_mode_status