linux-kernel - Re: [PATCH 4/4] usb: chipidea: msm: Use USB PHY API to control PHY state

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Date:	Mon, 11 Nov 2013 21:59:32 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
CC:	<alexander.shishkin@...ux.intel.com>, <gregkh@...uxfoundation.org>,
	<rob.herring@...xeda.com>, <pawel.moll@....com>,
	<mark.rutland@....com>, <swarren@...dotorg.org>,
	<ijc+devicetree@...lion.org.uk>, <davidb@...eaurora.org>,
	<linux-usb@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] usb: chipidea: msm: Use USB PHY API to control PHY
 state

On Mon, Nov 11, 2013 at 03:35:37PM +0200, Ivan T. Ivanov wrote:
> From: "Ivan T. Ivanov" <iivanov@...sol.com>
> 
> PHY drivers keep track of the current state of the hardware,
> so don't change PHY settings under it.
> 
> Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
> ---
>  drivers/usb/chipidea/ci_hdrc_msm.c |    9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c
> index e9624f3..338b209 100644
> --- a/drivers/usb/chipidea/ci_hdrc_msm.c
> +++ b/drivers/usb/chipidea/ci_hdrc_msm.c
> @@ -20,13 +20,11 @@
>  static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
>  {
>  	struct device *dev = ci->gadget.dev.parent;
> -	int val;
>  
>  	switch (event) {
>  	case CI_HDRC_CONTROLLER_RESET_EVENT:
>  		dev_dbg(dev, "CI_HDRC_CONTROLLER_RESET_EVENT received\n");
> -		writel(0, USB_AHBBURST);
> -		writel(0, USB_AHBMODE);
> +		usb_phy_init(ci->transceiver);

It will reset the PHY,  but your comment is "don't change PHY settings under it"

>  		break;
>  	case CI_HDRC_CONTROLLER_STOPPED_EVENT:
>  		dev_dbg(dev, "CI_HDRC_CONTROLLER_STOPPED_EVENT received\n");
> @@ -34,10 +32,7 @@ static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
>  		 * Put the transceiver in non-driving mode. Otherwise host
>  		 * may not detect soft-disconnection.
>  		 */
> -		val = usb_phy_io_read(ci->transceiver, ULPI_FUNC_CTRL);
> -		val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
> -		val |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
> -		usb_phy_io_write(ci->transceiver, val, ULPI_FUNC_CTRL);
> +		usb_phy_notify_disconnect(ci->transceiver, USB_SPEED_UNKNOWN);

Where you have implemented .notify_disconnect?
I have not found it at your phy driver.


-- 

Best Regards,
Peter Chen

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