linux-kernel - Re: [linux-sunxi] [PATCH v2 3/7] phy: usb: sunxi: Introduce Allwinner A31 USB PHY support

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Message-ID: <5370BD76.2060908@ti.com>
Date:	Mon, 12 May 2014 17:54:22 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Hans de Goede <hdegoede@...hat.com>, Chen-Yu Tsai <wens@...e.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>
CC:	Emilio Lopez <emilio@...pez.com.ar>,
	Mike Turquette <mturquette@...aro.org>,
	<stern@...land.harvard.edu>,
	Boris Brezillon <boris@...e-electrons.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-usb <linux-usb@...r.kernel.org>, <kevin.z.m.zh@...il.com>,
	<sunny@...winnertech.com>, Shuge <shuge@...winnertech.com>,
	<zhuzhenhua@...winnertech.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: Re: [linux-sunxi] [PATCH v2 3/7] phy: usb: sunxi: Introduce Allwinner
 A31 USB PHY support

Hi,

On Monday 12 May 2014 05:29 PM, Hans de Goede wrote:
> Hi,
> 
> On 05/12/2014 11:14 AM, Chen-Yu Tsai wrote:
>> Hi,
>>
>> On Sat, May 10, 2014 at 8:56 PM, Maxime Ripard
>> <maxime.ripard@...e-electrons.com> wrote:
>>> The USB phy controller in the A31 differs mostly from the older controllers
>>> because it has a clock dedicated for each phy, while the older ones were having
>>> a single clock for all the phys.
>>>
>>> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
>>> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
>>> ---
>>>  drivers/phy/phy-sun4i-usb.c | 35 ++++++++++++++++++++++++++---------
>>>  1 file changed, 26 insertions(+), 9 deletions(-)
>>>
>>> diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
>>> index e6e6c4ba7145..8bd89430d945 100644
>>> --- a/drivers/phy/phy-sun4i-usb.c
>>> +++ b/drivers/phy/phy-sun4i-usb.c
>>> @@ -61,7 +61,6 @@
>>>  #define MAX_PHYS                       3
>>>
>>>  struct sun4i_usb_phy_data {
>>> -       struct clk *clk;
>>>         void __iomem *base;
>>>         struct mutex mutex;
>>>         int num_phys;
>>> @@ -71,6 +70,7 @@ struct sun4i_usb_phy_data {
>>>                 void __iomem *pmu;
>>>                 struct regulator *vbus;
>>>                 struct reset_control *reset;
>>> +               struct clk *clk;
>>>                 int index;
>>>         } phys[MAX_PHYS];
>>>  };
>>> @@ -146,13 +146,13 @@ static int sun4i_usb_phy_init(struct phy *_phy)
>>>         struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
>>>         int ret;
>>>
>>> -       ret = clk_prepare_enable(data->clk);
>>> +       ret = clk_prepare_enable(phy->clk);
>>>         if (ret)
>>>                 return ret;
>>>
>>>         ret = reset_control_deassert(phy->reset);
>>>         if (ret) {
>>> -               clk_disable_unprepare(data->clk);
>>> +               clk_disable_unprepare(phy->clk);
>>>                 return ret;
>>>         }
>>>
>>> @@ -170,11 +170,10 @@ static int sun4i_usb_phy_init(struct phy *_phy)
>>>  static int sun4i_usb_phy_exit(struct phy *_phy)
>>>  {
>>>         struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
>>> -       struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
>>>
>>>         sun4i_usb_phy_passby(phy, 0);
>>>         reset_control_assert(phy->reset);
>>> -       clk_disable_unprepare(data->clk);
>>> +       clk_disable_unprepare(phy->clk);
>>>
>>>         return 0;
>>>  }
>>> @@ -228,8 +227,10 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
>>>         struct phy_provider *phy_provider;
>>>         struct reset_control *reset;
>>>         struct regulator *vbus;
>>> +       bool dedicated_clocks;
>>
>> No default?
>>
>>>         struct resource *res;
>>>         struct phy *phy;
>>> +       struct clk *clk;
>>>         char name[16];
>>>         int i;
>>>
>>> @@ -249,15 +250,20 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
>>>         else
>>>                 data->disc_thresh = 2;
>>>
>>> +       if (of_device_is_compatible(np, "allwinner,sun6i-a31-usb-phy"))
>>> +               dedicated_clocks = true;
>>> +
>>
>> dedicated_clocks is more than likely to be true from leftover data
>> on the stack. This results in the usb phy driver probe failing, and
>> the usb host drivers left in perpetual probe deferral on my Cubietruck.
>>
>> Adding an else section fixes this.
> 
> Good catch, fixed this in the sunxi-devel branch for now (until Maxime sends a new version).

so I wont be taking this patch in my tree. Anyway FWIW
Acked-by: Kishon Vijay Abraham I <kishon@...com>
> 
> Regards,
> 
> Hans
> 
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