linux-kernel - Re: [PATCH 05/24] thunderbolt: Rework capability handling

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Date:   Thu, 18 May 2017 19:38:29 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <yehezkel.bernat@...el.com>,
        Lukas Wunner <lukas@...ner.de>,
        Amir Levy <amir.jer.levy@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Mario Limonciello <Mario.Limonciello@...l.com>,
        Jared.Dominguez@...l.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/24] thunderbolt: Rework capability handling

On Thu, May 18, 2017 at 5:38 PM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:
> Organization of the capabilities in switches and ports is not so random
> after all. Rework the capability handling functionality so that it
> follows how capabilities are organized and provide two new functions
> (tb_switch_find_vsec_cap() and tb_port_find_cap()) which can be used to
> extract capabilities for ports and switches. Then convert the current
> users over these.

One nit here.

> +int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap)
>  {

> +       u32 offset;
>

> +       /*
> +        * DP out adapters claim to implement TMU capability but in
> +        * reality they do not so we hard code the adapter specific
> +        * capability offset here.
> +        */
> +       if (port->config.type == TB_TYPE_DP_HDMI_OUT)
> +               offset = 0x39;
>         else

> +               offset = 0x1;
> +
> +       do {
> +               struct tb_cap_any header;
> +               int ret;
> +
> +               ret = tb_port_read(port, &header, TB_CFG_PORT, offset, 1);
> +               if (ret)
> +                       return ret;
> +
> +               if (header.basic.cap == cap)
> +                       return offset;
> +
> +               offset = header.basic.next;
> +       } while (offset);
> +
> +       return -ENOENT;
>  }

> +static int tb_switch_find_cap(struct tb_switch *sw, enum tb_switch_cap cap)
>  {

> +       int offset = sw->config.first_cap_offset;
> +
> +       while (offset > 0 && offset < CAP_OFFSET_MAX) {
> +               struct tb_cap_any header;
> +               int ret;
> +
> +               ret = tb_sw_read(sw, &header, TB_CFG_SWITCH, offset, 1);
> +               if (ret)
> +                       return ret;
> +
> +               if (header.basic.cap == cap)
> +                       return offset;
> +
> +               offset = header.basic.next;
>         }

> +
> +       return -ENOENT;
>  }

Both has quite similar bodies.
Wouldn't be nice to split out a helper which takes initial offset and
type as parameters?


-- 
With Best Regards,
Andy Shevchenko