Re: [PATCH v15 15/16] drm/mediatek: dpi: Only enable dpi after the bridge is enabled

[CK Hu <ck.hu@mediatek.com>]

Hi, Bo-Chen:

On Fri, 2022-07-01 at 11:58 +0800, Bo-Chen Chen wrote:
> From: Guillaume Ranquet <granquet@baylibre.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.

Applied to mediatek-drm-next [1], thanks.

[1]

https://urldefense.com/v3/__https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next__;!!CTRNKA9wMg0ARbw!zWEwCacmscK6lKiUsSJg-EhOk-w28LbLdjhkF_xNfenUSrdS0RCxyNYy1_Rq5Q$
 

Regards,
CK

> 
> Fixes: 9e629c17aa8d ("drm/mediatek: Add DPI sub driver")
> Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
> Tested-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@collabora.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 a65b85c4c8d5..be039474cf26 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -513,7 +513,6 @@ 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:
> @@ -734,6 +733,7 @@ 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