linux-kernel - Re: [PATCH] drm/bridge: anx7625: Fix power on delay

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Date:   Tue, 27 Apr 2021 16:18:35 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Hsin-Yi Wang <hsinyi@...omium.org>,
        Robert Foss <robert.foss@...aro.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Xin Ji <xji@...logixsemi.com>,
        Sam Ravnborg <sam@...nborg.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: anx7625: Fix power on delay

On 27/04/2021 07:53, Hsin-Yi Wang wrote:
> From anx7625 spec, the delay between powering on power supplies and gpio
> should be larger than 10ms.
> 
> Fixes: 6c744983004e ("drm/bridge: anx7625: disable regulators when power off")
> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> ---
>  drivers/gpu/drm/bridge/analogix/anx7625.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
> index 23283ba0c4f9..0a8db745cfd5 100644
> --- a/drivers/gpu/drm/bridge/analogix/anx7625.c
> +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
> @@ -893,7 +893,7 @@ static void anx7625_power_on(struct anx7625_data *ctx)
>  		usleep_range(2000, 2100);
>  	}
>  
> -	usleep_range(4000, 4100);
> +	usleep_range(10000, 11000);
>  
>  	/* Power on pin enable */
>  	gpiod_set_value(ctx->pdata.gpio_p_on, 1);
> 

Reviewed-by: Neil Armstrong <narmstrong@...libre.com>