linux-kernel - Re: [PATCH v3 1/3] drm/bridge: parade-ps8640: Improve logging at probing

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Date:   Fri, 17 Sep 2021 15:43:31 -0700
From:   Philip Chen <philipchen@...omium.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v3 1/3] drm/bridge: parade-ps8640: Improve logging at probing

Hi Stephen,

Based on the discussion in [1], this patch is not really needed for now.
So I'll just remove this patch from v4.
Thanks.

[1] https://patchwork.kernel.org/project/dri-devel/patch/20210914162825.v3.2.Ib06997ddd73e2ac29e185f039d85cfa8e760d641@changeid/

On Tue, Sep 14, 2021 at 5:27 PM Stephen Boyd <swboyd@...omium.org> wrote:
>
> Quoting Philip Chen (2021-09-14 16:28:43)
> > Use dev_err_probe() to add logs for error cases at probing time.
> >
> > Signed-off-by: Philip Chen <philipchen@...omium.org>
> > ---
> >
>
> Can you use a cover-letter for more than one patch series?
>
> > (no changes since v1)
> >
> >  drivers/gpu/drm/bridge/parade-ps8640.c | 22 ++++++++++++++--------
> >  1 file changed, 14 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> > index 685e9c38b2db..e340af381e05 100644
> > --- a/drivers/gpu/drm/bridge/parade-ps8640.c
> > +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
> > @@ -332,8 +332,10 @@ static int ps8640_probe(struct i2c_client *client)
> >                 return -ENODEV;
> >
> >         ps_bridge->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
> > -       if (IS_ERR(ps_bridge->panel_bridge))
> > -               return PTR_ERR(ps_bridge->panel_bridge);
> > +       if (IS_ERR(ps_bridge->panel_bridge)) {
> > +               return dev_err_probe(dev, PTR_ERR(ps_bridge->panel_bridge),
> > +                                    "Error creating bridge device\n");
>
> From what I can tell it never returns -EPROBE_DEFER? So this isn't
> useful.
>
> > +       }
> >
> >         ps_bridge->supplies[0].supply = "vdd33";
> >         ps_bridge->supplies[1].supply = "vdd12";
> > @@ -344,16 +346,20 @@ static int ps8640_probe(struct i2c_client *client)
> >
> >         ps_bridge->gpio_powerdown = devm_gpiod_get(&client->dev, "powerdown",
> >                                                    GPIOD_OUT_HIGH);
> > -       if (IS_ERR(ps_bridge->gpio_powerdown))
> > -               return PTR_ERR(ps_bridge->gpio_powerdown);
> > +       if (IS_ERR(ps_bridge->gpio_powerdown)) {
> > +               return dev_err_probe(dev, PTR_ERR(ps_bridge->gpio_powerdown),
> > +                                    "Error getting gpio_powerdown\n");
>
> This looks ok, except we don't want braces on single statement ifs.
>
> > +       }
> >
> >         /*
> >          * Assert the reset to avoid the bridge being initialized prematurely
> >          */
> >         ps_bridge->gpio_reset = devm_gpiod_get(&client->dev, "reset",
> >                                                GPIOD_OUT_HIGH);
> > -       if (IS_ERR(ps_bridge->gpio_reset))
> > -               return PTR_ERR(ps_bridge->gpio_reset);
> > +       if (IS_ERR(ps_bridge->gpio_reset)) {
> > +               return dev_err_probe(dev, PTR_ERR(ps_bridge->gpio_reset),
> > +                                    "Error getting gpio_reset\n");
>
> Same.
>
> > +       }
> >
> >         ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
> >         ps_bridge->bridge.of_node = dev->of_node;