linux-kernel - Re: [PATCH v2 3/6] drm/panel: simple: Add "no-hpd" delay for Innolux TV123WAM

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Date:   Fri, 26 Oct 2018 10:41:39 -0400
From:   Sean Paul <sean@...rly.run>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Sean Paul <seanpaul@...omium.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Sandeep Panda <spanda@...eaurora.org>,
        linux-arm-msm@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        jsanka@...eaurora.org, ryandcase@...omium.org,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/6] drm/panel: simple: Add "no-hpd" delay for Innolux
 TV123WAM

On Thu, Oct 25, 2018 at 03:21:31PM -0700, Douglas Anderson wrote:
> If the HPD signal isn't hooked up to this panel we need a 200 ms
> delay.  In the datasheet this is shown as the maximum time that HPD
> will take to be asserted after power is given to the panel.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

Reviewed-by: Sean Paul <sean@...rly.run>

> ---
> 
> Changes in v2:
> - Use "hpd_absent_delay" property instead of a bool + prepare delay
> 
>  drivers/gpu/drm/panel/panel-simple.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 687fd087b9fc..88592f9a0018 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -1396,6 +1396,7 @@ static const struct panel_desc innolux_tv123wam = {
>  		.height = 173,
>  	},
>  	.delay = {
> +		.hpd_absent_delay = 200,
>  		.unprepare = 500,
>  	},
>  };
> -- 
> 2.19.1.568.g152ad8e336-goog
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS