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From:   Peter Chen <peter.chen@nxp.com>
To:     Pawel Laszczak <pawell@cadence.com>
CC:     "balbi@kernel.org" <balbi@kernel.org>,
        "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
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        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
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        "dan.carpenter@oracle.com" <dan.carpenter@oracle.com>,
        "heikki.krogerus@linux.intel.com" <heikki.krogerus@linux.intel.com>,
        "colin.king@canonical.com" <colin.king@canonical.com>,
        "jpawar@cadence.com" <jpawar@cadence.com>,
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        "kurahul@cadence.com" <kurahul@cadence.com>,
        "sparmar@cadence.com" <sparmar@cadence.com>
Subject: Re: [PATCH 9/9] usb: cdns3: Impovement: simplify *switch_gadet and
 *switch_host
Thread-Topic: [PATCH 9/9] usb: cdns3: Impovement: simplify *switch_gadet and
 *switch_host
Thread-Index: AQHWT3AXFHF3xDPMa0+wH8koBQd7iaj7tFaA
Date:   Tue, 7 Jul 2020 06:41:04 +0000
Message-ID: <20200707064113.GH16073@b29397-desktop>
References: <20200701062004.29908-1-pawell@cadence.com>
 <20200701062004.29908-10-pawell@cadence.com>
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On 20-07-01 08:20:04, Pawel Laszczak wrote:
> Patch split function cdns3_drd_switch_gadget and
> cdns3_drd_switch_host into:
> - cdns3_drd_host_on
> - cdns3_drd_host_off
> - cdns3_drd_gadget_on
> - cdns3_drd_gadgett_off
>=20
> These functions don't have any shared code so it's better to
> have smaller, faster and easier functions.

Changes the patch title, otherwise:

Reviewed-by: Peter Chen <peter.chen@nxp.com>

Peter
>=20
> Signed-off-by: Pawel Laszczak <pawell@cadence.com>
> ---
>  drivers/usb/cdns3/drd.c    | 124 ++++++++++++++++++++-----------------
>  drivers/usb/cdns3/drd.h    |   6 +-
>  drivers/usb/cdns3/gadget.c |   4 +-
>  drivers/usb/cdns3/host.c   |   4 +-
>  4 files changed, 76 insertions(+), 62 deletions(-)
>=20
> diff --git a/drivers/usb/cdns3/drd.c b/drivers/usb/cdns3/drd.c
> index 8e7673da905e..6234bcd6158a 100644
> --- a/drivers/usb/cdns3/drd.c
> +++ b/drivers/usb/cdns3/drd.c
> @@ -124,85 +124,97 @@ static void cdns3_otg_enable_irq(struct cdns3 *cdns=
)
>  }
> =20
>  /**
> - * cdns3_drd_switch_host - start/stop host
> - * @cdns: Pointer to controller context structure
> - * @on: 1 for start, 0 for stop
> + * cdns3_drd_host_on - start host.
> + * @cdns: Pointer to controller context structure.
>   *
> - * Returns 0 on success otherwise negative errno
> + * Returns 0 on success otherwise negative errno.
>   */
> -int cdns3_drd_switch_host(struct cdns3 *cdns, int on)
> +int cdns3_drd_host_on(struct cdns3 *cdns)
>  {
> -	int ret, val;
> +	u32 val;
> +	int ret;
> =20
> -	/* switch OTG core */
> -	if (on) {
> -		writel(OTGCMD_HOST_BUS_REQ | OTGCMD_OTG_DIS,
> -		       &cdns->otg_regs->cmd);
> -
> -		dev_dbg(cdns->dev, "Waiting till Host mode is turned on\n");
> -		ret =3D readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
> -						val & OTGSTS_XHCI_READY,
> -						1, 100000);
> -		if (ret) {
> -			dev_err(cdns->dev, "timeout waiting for xhci_ready\n");
> -			return ret;
> -		}
> -	} else {
> -		writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
> -		       OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
> -		       &cdns->otg_regs->cmd);
> -		/* Waiting till H_IDLE state.*/
> -		readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
> -					  !(val & OTGSTATE_HOST_STATE_MASK),
> -					  1, 2000000);
> -	}
> +	/* Enable host mode. */
> +	writel(OTGCMD_HOST_BUS_REQ | OTGCMD_OTG_DIS,
> +	       &cdns->otg_regs->cmd);
> =20
> -	return 0;
> +	dev_dbg(cdns->dev, "Waiting till Host mode is turned on\n");
> +	ret =3D readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
> +					val & OTGSTS_XHCI_READY, 1, 100000);
> +
> +	if (ret)
> +		dev_err(cdns->dev, "timeout waiting for xhci_ready\n");
> +
> +	return ret;
>  }
> =20
>  /**
> - * cdns3_drd_switch_gadget - start/stop gadget
> - * @cdns: Pointer to controller context structure
> - * @on: 1 for start, 0 for stop
> + * cdns3_drd_host_off - stop host.
> + * @cdns: Pointer to controller context structure.
> + */
> +void cdns3_drd_host_off(struct cdns3 *cdns)
> +{
> +	u32 val;
> +
> +	writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
> +	       OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
> +	       &cdns->otg_regs->cmd);
> +
> +	/* Waiting till H_IDLE state.*/
> +	readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
> +				  !(val & OTGSTATE_HOST_STATE_MASK),
> +				  1, 2000000);
> +}
> +
> +/**
> + * cdns3_drd_gadget_on - start gadget.
> + * @cdns: Pointer to controller context structure.
>   *
>   * Returns 0 on success otherwise negative errno
>   */
> -int cdns3_drd_switch_gadget(struct cdns3 *cdns, int on)
> +int cdns3_drd_gadget_on(struct cdns3 *cdns)
>  {
>  	int ret, val;
>  	u32 reg =3D OTGCMD_OTG_DIS;
> =20
>  	/* switch OTG core */
> -	if (on) {
> -		writel(OTGCMD_DEV_BUS_REQ | reg, &cdns->otg_regs->cmd);
> +	writel(OTGCMD_DEV_BUS_REQ | reg, &cdns->otg_regs->cmd);
> =20
> -		dev_dbg(cdns->dev, "Waiting till Device mode is turned on\n");
> +	dev_dbg(cdns->dev, "Waiting till Device mode is turned on\n");
> =20
> -		ret =3D readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
> -						val & OTGSTS_DEV_READY,
> -						1, 100000);
> -		if (ret) {
> -			dev_err(cdns->dev, "timeout waiting for dev_ready\n");
> -			return ret;
> -		}
> -	} else {
> -		/*
> -		 * driver should wait at least 10us after disabling Device
> -		 * before turning-off Device (DEV_BUS_DROP)
> -		 */
> -		usleep_range(20, 30);
> -		writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
> -		       OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
> -		       &cdns->otg_regs->cmd);
> -		/* Waiting till DEV_IDLE state.*/
> -		readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
> -					  !(val & OTGSTATE_DEV_STATE_MASK),
> -					  1, 2000000);
> +	ret =3D readl_poll_timeout_atomic(&cdns->otg_regs->sts, val,
> +					val & OTGSTS_DEV_READY,
> +					1, 100000);
> +	if (ret) {
> +		dev_err(cdns->dev, "timeout waiting for dev_ready\n");
> +		return ret;
>  	}
> =20
>  	return 0;
>  }
> =20
> +/**
> + * cdns3_drd_gadget_off - stop gadget.
> + * @cdns: Pointer to controller context structure.
> + */
> +void cdns3_drd_gadget_off(struct cdns3 *cdns)
> +{
> +	u32 val;
> +
> +	/*
> +	 * Driver should wait at least 10us after disabling Device
> +	 * before turning-off Device (DEV_BUS_DROP).
> +	 */
> +	usleep_range(20, 30);
> +	writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP |
> +	       OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF,
> +	       &cdns->otg_regs->cmd);
> +	/* Waiting till DEV_IDLE state.*/
> +	readl_poll_timeout_atomic(&cdns->otg_regs->state, val,
> +				  !(val & OTGSTATE_DEV_STATE_MASK),
> +				  1, 2000000);
> +}
> +
>  /**
>   * cdns3_init_otg_mode - initialize drd controller
>   * @cdns: Pointer to controller context structure
> diff --git a/drivers/usb/cdns3/drd.h b/drivers/usb/cdns3/drd.h
> index 3889fead9df1..7e7cf7fa2dd3 100644
> --- a/drivers/usb/cdns3/drd.h
> +++ b/drivers/usb/cdns3/drd.h
> @@ -163,8 +163,10 @@ int cdns3_get_vbus(struct cdns3 *cdns);
>  int cdns3_drd_init(struct cdns3 *cdns);
>  int cdns3_drd_exit(struct cdns3 *cdns);
>  int cdns3_drd_update_mode(struct cdns3 *cdns);
> -int cdns3_drd_switch_gadget(struct cdns3 *cdns, int on);
> -int cdns3_drd_switch_host(struct cdns3 *cdns, int on);
> +int cdns3_drd_gadget_on(struct cdns3 *cdns);
> +void cdns3_drd_gadget_off(struct cdns3 *cdns);
> +int cdns3_drd_host_on(struct cdns3 *cdns);
> +void cdns3_drd_host_off(struct cdns3 *cdns);
>  int cdns3_set_mode(struct cdns3 *cdns, enum usb_dr_mode mode);
> =20
>  #endif /* __LINUX_CDNS3_DRD */
> diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
> index c303ab7c62d1..6ea6839a2a8c 100644
> --- a/drivers/usb/cdns3/gadget.c
> +++ b/drivers/usb/cdns3/gadget.c
> @@ -3014,7 +3014,7 @@ void cdns3_gadget_exit(struct cdns3 *cdns)
>  	kfree(priv_dev->zlp_buf);
>  	kfree(priv_dev);
>  	cdns->gadget_dev =3D NULL;
> -	cdns3_drd_switch_gadget(cdns, 0);
> +	cdns3_drd_gadget_off(cdns);
>  }
> =20
>  static int cdns3_gadget_start(struct cdns3 *cdns)
> @@ -3145,7 +3145,7 @@ static int __cdns3_gadget_init(struct cdns3 *cdns)
>  		return ret;
>  	}
> =20
> -	cdns3_drd_switch_gadget(cdns, 1);
> +	cdns3_drd_gadget_on(cdns);
>  	pm_runtime_get_sync(cdns->dev);
> =20
>  	ret =3D cdns3_gadget_start(cdns);
> diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c
> index ad788bf3fe4f..36c63d9ecd37 100644
> --- a/drivers/usb/cdns3/host.c
> +++ b/drivers/usb/cdns3/host.c
> @@ -19,7 +19,7 @@ static int __cdns3_host_init(struct cdns3 *cdns)
>  	struct platform_device *xhci;
>  	int ret;
> =20
> -	cdns3_drd_switch_host(cdns, 1);
> +	cdns3_drd_host_on(cdns);
> =20
>  	xhci =3D platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
>  	if (!xhci) {
> @@ -53,7 +53,7 @@ static void cdns3_host_exit(struct cdns3 *cdns)
>  {
>  	platform_device_unregister(cdns->host_dev);
>  	cdns->host_dev =3D NULL;
> -	cdns3_drd_switch_host(cdns, 0);
> +	cdns3_drd_host_off(cdns);
>  }
> =20
>  int cdns3_host_init(struct cdns3 *cdns)
> --=20
> 2.17.1
>=20

--=20

Thanks,
Peter Chen=