From: Stefan Wahren <[email protected]> Sent: Thursday, June 09, 2016 4:43 
AM
> To: David Miller <[email protected]>; Fugang Duan
> <[email protected]>
> Cc: Fabio Estevam <[email protected]>; Lucas Stach
> <[email protected]>; [email protected]; [email protected]; Troy
> Kisky <[email protected]>; [email protected];
> [email protected]; Stefan Wahren <[email protected]>
> Subject: [PATCH net-next RFT] net: fec: handle small PHY reset durations more
> precisely
> 
> Since msleep is based on jiffies the PHY reset could take longer than 
> expected.
> So use msleep for values greater than 20 msec otherwise usleep_range.
> 
> Signed-off-by: Stefan Wahren <[email protected]>
> ---
>  drivers/net/ethernet/freescale/fec_main.c |    7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/freescale/fec_main.c
> b/drivers/net/ethernet/freescale/fec_main.c
> index 3c0255e..49f8055 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -3191,7 +3191,12 @@ static void fec_reset_phy(struct platform_device
> *pdev)
>               dev_err(&pdev->dev, "failed to get phy-reset-gpios: %d\n", err);
>               return;
>       }
> -     msleep(msec);
> +
> +     if (msec > 20)
> +             msleep(msec);
> +     else
> +             usleep_range(msec * 1000, msec * 1000 + 1000);
> +
>       gpio_set_value_cansleep(phy_reset, !active_high);  }  #else /*
> CONFIG_OF */
> --
> 1.7.9.5

Thanks. You are correct base on Documentation/timers/timers-howto.txt.

Acked-by: Fugang Duan <[email protected]>

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