linux-kernel - Re: [PATCH net-next v4 1/4] phylib: Add device reset delay support

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Date:   Thu, 7 Dec 2017 16:01:11 +0100
From:   Richard Leitner <richard.leitner@...data.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Richard Leitner <dev@...l1n.net>
CC:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Fugang Duan <fugang.duan@....com>,
        Andrew Lunn <andrew@...n.ch>,
        "Florian Fainelli" <f.fainelli@...il.com>,
        Frank Rowand <frowand.list@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Baruch Siach <baruch@...s.co.il>,
        "David Wu" <david.wu@...k-chips.com>, <lukma@...x.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v4 1/4] phylib: Add device reset delay support

Hi Geert,

On 12/07/2017 03:52 PM, Geert Uytterhoeven wrote:
> Hi Richard,
> 
> On Thu, Dec 7, 2017 at 3:43 PM, Richard Leitner <dev@...l1n.net> wrote:
>> --- a/drivers/net/phy/mdio_device.c
>> +++ b/drivers/net/phy/mdio_device.c
>> @@ -24,6 +24,7 @@
>>  #include <linux/slab.h>
>>  #include <linux/string.h>
>>  #include <linux/unistd.h>
>> +#include <linux/delay.h>
>>
>>  void mdio_device_free(struct mdio_device *mdiodev)
>>  {
>> @@ -118,8 +119,16 @@ EXPORT_SYMBOL(mdio_device_remove);
>>
>>  void mdio_device_reset(struct mdio_device *mdiodev, int value)
>>  {
>> -       if (mdiodev->reset)
>> -               gpiod_set_value(mdiodev->reset, value);
>> +       unsigned int d;
>> +
>> +       if (!mdiodev->reset)
>> +               return;
>> +
>> +       gpiod_set_value(mdiodev->reset, value);
>> +
>> +       d = value ? mdiodev->reset_delay : mdiodev->reset_post_delay;
>> +       if (d)
>> +               usleep_range(d, d + min_t(unsigned int, d / 10, 100));
> 
> Oops, I meant "max_t", not "min_t", else the upper limit can be "d + 0",
> which is not what we want.

You're right...

> Sorry, my fault.

I just copied it over from you suggestion without thinking about it...
So it's definitely my fault too ;-)

I'll wait for some more comments and send a new version next week.

regards;Richard.L