linux-kernel - Re: [PATCH 2/3] scsi: ufs: Allow resetting the UFS device

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Message-ID: <5cf68d5b.1c69fb81.281cd.5f93@mx.google.com>
Date:   Tue, 04 Jun 2019 08:25:14 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Pedro Sousa <pedrom.sousa@...opsys.com>
Cc:     Andy Gross <agross@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH 2/3] scsi: ufs: Allow resetting the UFS device

Quoting Bjorn Andersson (2019-06-04 00:20:00)
> @@ -6104,6 +6105,25 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
>         return err;
>  }
>  
> +/**
> + ufshcd_device_reset() - toggle the (optional) device reset line
> + * @hba: per-adapter instance
> + *
> + * Toggles the (optional) reset line to reset the attached device.
> + */
> +static void ufshcd_device_reset(struct ufs_hba *hba)
> +{
> +       /*
> +        * The USB device shall detect reset pulses of 1us, sleep for 10us to

This isn't usb though. Can we have a gpio reset driver and then
implement this in the reset framework instead? Or did that not work out
for some reason?

> +        * be on the safe side.
> +        */
> +       gpiod_set_value_cansleep(hba->device_reset, 1);
> +       usleep_range(10, 15);
> +
> +       gpiod_set_value_cansleep(hba->device_reset, 0);
> +       usleep_range(10, 15);
> +}
> +
>  /**
>   * ufshcd_host_reset_and_restore - reset and restore host controller
>   * @hba: per-adapter instance