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

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Date:   Tue, 14 Sep 2021 17:27:14 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        Philip Chen <philipchen@...omium.org>
Cc:     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@...ts.freedesktop.org
Subject: Re: [PATCH v3 1/3] drm/bridge: parade-ps8640: Improve logging at probing

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;