linux-kernel - Re: [PATCH 3/3] drm/panel-edp: Fix variable typo when saving hpd absent delay from DT

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Date:   Tue, 19 Jul 2022 15:45:39 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, kernel@...labora.com,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Linus Walleij <linus.walleij@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] drm/panel-edp: Fix variable typo when saving hpd
 absent delay from DT

Hi,

On Tue, Jul 19, 2022 at 1:39 PM Nícolas F. R. A. Prado
<nfraprado@...labora.com> wrote:
>
> The value read from the "hpd-absent-delay-ms" property in DT was being
> saved to the wrong variable, overriding the hpd_reliable delay. Fix the
> typo.
>
> Fixes: 5540cf8f3e8d ("drm/panel-edp: Implement generic "edp-panel"s probed by EDID")
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> ---
>
>  drivers/gpu/drm/panel/panel-edp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-edp.c b/drivers/gpu/drm/panel/panel-edp.c
> index 152e00eb846f..b3536d8600f4 100644
> --- a/drivers/gpu/drm/panel/panel-edp.c
> +++ b/drivers/gpu/drm/panel/panel-edp.c
> @@ -738,7 +738,7 @@ static int generic_edp_panel_probe(struct device *dev, struct panel_edp *panel)
>         of_property_read_u32(dev->of_node, "hpd-reliable-delay-ms", &reliable_ms);
>         desc->delay.hpd_reliable = reliable_ms;
>         of_property_read_u32(dev->of_node, "hpd-absent-delay-ms", &absent_ms);
> -       desc->delay.hpd_reliable = absent_ms;
> +       desc->delay.hpd_absent = absent_ms;

Well that's embarrassing. In the end I never used any of these
properties for anything shipping since HPD was always hooked up on
later boards and the only board that needed "hpd_reliable" never ended
up switching to the generic "edp-panel".

Reviewed-by: Douglas Anderson <dianders@...omium.org>

I'll apply this right away to drm-misc-fixes.