linux-kernel - Re: [PATCH v5 2/6] usb: dwc3: adapt dwc3 core to use Generic PHY Framework

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Message-ID: <53173809.2060303@ti.com>
Date:	Wed, 5 Mar 2014 16:43:21 +0200
From:	Roger Quadros <rogerq@...com>
To:	Kishon Vijay Abraham I <kishon@...com>, <bcousson@...libre.com>,
	<balbi@...com>, <devicetree@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, <george.cherian@...com>,
	<heikki.krogerus@...ux.intel.com>
CC:	<rob.herring@...xeda.com>, <pawel.moll@....com>,
	<mark.rutland@....com>, <swarren@...dotorg.org>,
	<ijc+devicetree@...lion.org.uk>, <rob@...dley.net>,
	<tony@...mide.com>, <linux@....linux.org.uk>,
	<gregkh@...uxfoundation.org>, <grant.likely@...aro.org>,
	<s.nawrocki@...sung.com>, <galak@...eaurora.org>
Subject: Re: [PATCH v5 2/6] usb: dwc3: adapt dwc3 core to use Generic PHY
 Framework

Hi Kishon,

On 03/03/2014 01:38 PM, Kishon Vijay Abraham I wrote:
> Adapted dwc3 core to use the Generic PHY Framework. So for init, exit,
> power_on and power_off the following APIs are used phy_init(), phy_exit(),
> phy_power_on() and phy_power_off().
> 
> However using the old USB phy library wont be removed till the PHYs of all
> other SoC's using dwc3 core is adapted to the Generic PHY Framework.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  Documentation/devicetree/bindings/usb/dwc3.txt |    6 +-
>  drivers/usb/dwc3/core.c                        |   86 +++++++++++++++++++++---
>  drivers/usb/dwc3/core.h                        |    7 ++
>  3 files changed, 89 insertions(+), 10 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
> index e807635..471366d 100644
> --- a/Documentation/devicetree/bindings/usb/dwc3.txt
> +++ b/Documentation/devicetree/bindings/usb/dwc3.txt
> @@ -6,11 +6,13 @@ Required properties:
>   - compatible: must be "snps,dwc3"
>   - reg : Address and length of the register set for the device
>   - interrupts: Interrupts used by the dwc3 controller.
> +
> +Optional properties:
>   - usb-phy : array of phandle for the PHY device.  The first element
>     in the array is expected to be a handle to the USB2/HS PHY and
>     the second element is expected to be a handle to the USB3/SS PHY
> -
> -Optional properties:
> + - phys: from the *Generic PHY* bindings
> + - phy-names: from the *Generic PHY* bindings
>   - tx-fifo-resize: determines if the FIFO *has* to be reallocated.
>  
>  This is usually a subnode to DWC3 glue to which it is connected.
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 225a4d6..497234a 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -61,9 +61,10 @@ void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
>   * dwc3_core_soft_reset - Issues core soft reset and PHY reset
>   * @dwc: pointer to our context structure
>   */
> -static void dwc3_core_soft_reset(struct dwc3 *dwc)
> +static int dwc3_core_soft_reset(struct dwc3 *dwc)
>  {
>  	u32		reg;
> +	int		ret;
>  
>  	/* Before Resetting PHY, put Core in Reset */
>  	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
> @@ -82,6 +83,15 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
>  
>  	usb_phy_init(dwc->usb2_phy);
>  	usb_phy_init(dwc->usb3_phy);
> +	ret = phy_init(dwc->usb2_generic_phy);

you need to check if dwc->usb?_generic_phy is not NULL before using any of the PHY APIs
throughout this patch.

> +	if (ret < 0)
> +		return ret;
> +
> +	ret = phy_init(dwc->usb3_generic_phy);
> +	if (ret < 0) {
> +		phy_exit(dwc->usb2_generic_phy);
> +		return ret;
> +	}
>  	mdelay(100);
>  
>  	/* Clear USB3 PHY reset */
> @@ -100,6 +110,8 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
>  	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
>  	reg &= ~DWC3_GCTL_CORESOFTRESET;
>  	dwc3_writel(dwc->regs, DWC3_GCTL, reg);
> +
> +	return 0;
>  }
>  

cheers,
-roger

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