linux-kernel - Re: [PATCH v4 1/2] media: i2c: adv748x: add adv748x driver

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Date:   Tue, 13 Jun 2017 11:24:00 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Kieran Bingham <kbingham@...nel.org>
Cc:     Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sakari Ailus <sakari.ailus@....fi>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Subject: Re: [PATCH v4 1/2] media: i2c: adv748x: add adv748x driver

Hi Kieran,

On Tue, Jun 13, 2017 at 2:35 AM, Kieran Bingham <kbingham@...nel.org> wrote:
> From: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
>
> Provide support for the ADV7481 and ADV7482.
>
> The driver is modelled with 4 subdevices to allow simultaneous streaming
> from the AFE (Analog front end) and HDMI inputs though two CSI TX
> entities.
>
> The HDMI entity is linked to the TXA CSI bus, whilst the AFE is linked
> to the TXB CSI bus.
>
> The driver is based on a prototype by Koji Matsuoka in the Renesas BSP,
> and an earlier rework by Niklas Söderlund.
>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>

> --- /dev/null
> +++ b/drivers/media/i2c/adv748x/adv748x-hdmi.c

> +static int adv748x_hdmi_set_pixelrate(struct adv748x_hdmi *hdmi)
> +{
> +       struct v4l2_subdev *tx;
> +       struct v4l2_dv_timings timings;
> +       struct v4l2_bt_timings *bt = &timings.bt;
> +       unsigned int fps;
> +
> +       tx = adv748x_get_remote_sd(&hdmi->pads[ADV748X_HDMI_SOURCE]);
> +       if (!tx)
> +               return -ENOLINK;
> +
> +       adv748x_hdmi_query_dv_timings(&hdmi->sd, &timings);
> +
> +       fps = DIV_ROUND_CLOSEST(bt->pixelclock,
> +                               V4L2_DV_BT_FRAME_WIDTH(bt) *
> +                               V4L2_DV_BT_FRAME_HEIGHT(bt));

On arm32:

    drivers/built-in.o: In function `adv748x_hdmi_set_pixelrate':
    :(.text+0x1b8b1c): undefined reference to `__aeabi_uldivmod'

v4l2_bt_timings.pixelclock is u64, so you should use DIV_ROUND_CLOSEST_ULL()
instead.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds