linux-kernel - Re: [PATCH v3 3/3] drm/panel-fannal-c3004: Add fannal c3004 DSI panel

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Message-ID: <CAO9szn3PyQQRKsxdsOrmVNMP2xuvN4_dHwb1_TWEqmhnr3TLPA@mail.gmail.com>
Date:   Wed, 7 Jun 2023 15:38:20 +0200
From:   Paulo Pavacic <pavacic.p@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     neil.armstrong@...aro.org, sam@...nborg.org, airlied@...il.com,
        daniel@...ll.ch, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 3/3] drm/panel-fannal-c3004: Add fannal c3004 DSI panel

Hello,

uto, 6. lip 2023. u 16:45 Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> napisao je:
>
> On 06/06/2023 16:07, Paulo Pavacic wrote:
> > Fannal C3004 is a 480x800 display made by fannal that requires
> > DCS initialization sequences.
> >
> > Signed-off-by: Paulo Pavacic <pavacic.p@...il.com>
> > ---
> > v4 changelog:
> >  - formatting and style changes
>
> Are you sure? I see other changes - removal of some code, handling
> errors and GPIO.
>
> >  - change community room
>
> What does it mean? Where is this change in this patch?
>
> ...
>
> > +
> > +static const struct drm_panel_funcs fannal_panel_funcs = {
> > +     .prepare = fannal_panel_prepare,
> > +     .unprepare = fannal_panel_unprepare,
> > +     .enable = fannal_panel_enable,
> > +     .disable = fannal_panel_disable,
> > +     .get_modes = fannal_panel_get_modes,
> > +};
> > +
> > +static int fannal_panel_probe(struct mipi_dsi_device *dsi)
> > +{
> > +     struct device *dev = &dsi->dev;
> > +     struct fannal_panel_data *panel_data;
> > +     int ret;
> > +
> > +     panel_data = devm_kzalloc(&dsi->dev, sizeof(*panel_data), GFP_KERNEL);
> > +
>
> Drop blank line.
>
> > +     if (!panel_data)
> > +             return -ENOMEM;
> > +
> > +     panel_data->reset =
>
> You have wrong wrapping here. devm_gpiod_get_optional() goes after =.

I'm not sure why, but clang-format makes it that way. I'm using this
style: https://raw.githubusercontent.com/torvalds/linux/master/.clang-format
Do you have some other style?

>
> > +             devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
> > +
>
> Drop blank line.
>
> > +     if (IS_ERR(panel_data->reset)) {
> > +             return dev_err_probe(
> > +                     dev, PTR_ERR(panel_data->reset),
> > +                     "error: probe: get reset GPIO: (%d) Check the fdt\n",
> > +                     ret);
> > +     }
> > +
> > +     mipi_dsi_set_drvdata(dsi, panel_data);
> > +
> > +     dsi->format = MIPI_DSI_FMT_RGB888;
> > +     dsi->mode_flags = MIPI_DSI_CLOCK_NON_CONTINUOUS |
> > +                       MIPI_DSI_MODE_VSYNC_FLUSH | MIPI_DSI_MODE_VIDEO_HSE |
> > +                       MIPI_DSI_MODE_NO_EOT_PACKET |
> > +                       MIPI_DSI_MODE_VIDEO_SYNC_PULSE | MIPI_DSI_MODE_VIDEO;
> > +     dsi->lanes = 2;
> > +
> > +     gpiod_set_value_cansleep(panel_data->reset, 1);
> > +
> > +     drm_panel_init(&panel_data->panel, dev, &fannal_panel_funcs,
> > +                    DRM_MODE_CONNECTOR_DSI);
> > +     dev_set_drvdata(dev, panel_data);
> > +
> > +     drm_panel_add(&panel_data->panel);
> > +
>
>
> Best regards,
> Krzysztof
>

Thanks,
Paulo