Hi Frank,
On 06/16/2016 11:43 PM, Frank Wang wrote:
> Hi Guenter,
>
> On 2016/6/17 12:59, Guenter Roeck wrote:
>> On 06/16/2016 07:09 PM, Frank Wang wrote:
>>> The newer SoCs (rk3366, rk3399) take a different usb-phy IP block
>>> than rk3288 and before, and most of phy-related registers are also
>>> different from the past, so a new phy driver is required necessarily.
>>>
>>> Signed-off-by: Frank Wang <frank.wang at rock-chips.com>
>>> Suggested-by: Guenter Roeck <linux at roeck-us.net>
>>> Suggested-by: Doug Anderson <dianders at chromium.org>
>>> Reviewed-by: Heiko Stuebner <heiko at sntech.de>
>>> Tested-by: Heiko Stuebner <heiko at sntech.de>
>>> ---
>>
>> [ ... ]
>>
>>> +
>>> +static int rockchip_usb2phy_resume(struct phy *phy)
>>> +{
>>> + struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
>>> + struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
>>> + int ret;
>>> +
>>> + dev_dbg(&rport->phy->dev, "port resume\n");
>>> +
>>> + ret = clk_prepare_enable(rphy->clk480m);
>>> + if (ret)
>>> + return ret;
>>> +
>> If suspend can be called multiple times, resume can be called
>> multiple times as well. Doesn't this cause a clock imbalance
>> if you call clk_prepare_enable() multiple times on resume,
>> but clk_disable_unprepare() only once on suspend ?
>>
>
> Well, what you said is reasonable, How does something like below?
>
> @@ -307,6 +307,9 @@ static int rockchip_usb2phy_resume(struct phy *phy)
>
> dev_dbg(&rport->phy->dev, "port resume\n");
>
> + if (!rport->suspended)
> + return 0;
> +
> ret = clk_prepare_enable(rphy->clk480m);
> if (ret)
> return ret;
> @@ -327,12 +330,16 @@ static int rockchip_usb2phy_suspend(struct phy *phy)
>
> dev_dbg(&rport->phy->dev, "port suspend\n");
>
> + if (rport->suspended)
> + return 0;
> +
> ret = property_enable(rphy, &rport->port_cfg->phy_sus, true);
> if (ret)
> return ret;
>
> rport->suspended = true;
> clk_disable_unprepare(rphy->clk480m);
> +
> return 0;
> }
>
> @@ -485,6 +492,7 @@ static int rockchip_usb2phy_host_port_init(struct rockchip_usb2phy *rphy,
>
> rport->port_id = USB2PHY_PORT_HOST;
> rport->port_cfg = &rphy->phy_cfg->port_cfgs[USB2PHY_PORT_HOST];
> + rport->suspended = true;
>
Why does it start in suspended mode ? That seems odd.
Guenter
> mutex_init(&rport->mutex);
> INIT_DELAYED_WORK(&rport->sm_work, rockchip_usb2phy_sm_work);
>
