RE: [PATCH v4 2/7] scsi: ufs-qcom: Add reset control support for host controller

[Avri Altman <Avri.Altman@wdc.com>]

Hi,

> 
> 
> Add reset control for host controller so that host controller can be reset as
> required in its power up sequence.
> 
> Signed-off-by: Can Guo <cang@codeaurora.org>
> +       ret = reset_control_assert(host->core_reset);
> +       if (ret) {
> +               dev_err(hba->dev, "%s: core_reset assert failed, err = %d\n",
> +                                __func__, ret);
> +               goto out;
> +       }
> +
> +       /*
> +        * The hardware requirement for delay between assert/deassert
> +        * is at least 3-4 sleep clock (32.7KHz) cycles, which comes to
> +        * ~125us (4/32768). To be on the safe side add 200us delay.
> +        */
> +       usleep_range(200, 210);
Aren't you sleeping anyway in your reset_control_ops?

> +
> +       ret = reset_control_deassert(host->core_reset);
> +       if (ret)
> +               dev_err(hba->dev, "%s: core_reset deassert failed, err = %d\n",
> +                                __func__, ret);
> +
> +       usleep_range(1000, 1100);
ditto