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Date:   Thu, 14 May 2020 10:40:18 +0300
From:   Roger Quadros <rogerq@...com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
CC:     <balbi@...nel.org>, <robh+dt@...nel.org>, <vigneshr@...com>,
        <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] usb: dwc3: keystone: Turn on USB3 PHY before
 controller



On 14/05/2020 04:37, Chunfeng Yun wrote:
> On Wed, 2020-05-13 at 16:07 +0300, Roger Quadros wrote:
>> The Local Power Sleep Controller (LPSC) dependency on AM65
>> requires SERDES0 to be powered on before USB.
>>
>> We need to power up SERDES0 power domain and hold it on
>> throughout the reset, init, power on sequence.
>>
>> Signed-off-by: Roger Quadros <rogerq@...com>
>> ---
>>   drivers/usb/dwc3/dwc3-keystone.c | 47 +++++++++++++++++++++++++++++++-
>>   1 file changed, 46 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/dwc3/dwc3-keystone.c b/drivers/usb/dwc3/dwc3-keystone.c
>> index 1e14a6f4884b..46d46f3507fc 100644
>> --- a/drivers/usb/dwc3/dwc3-keystone.c
>> +++ b/drivers/usb/dwc3/dwc3-keystone.c
>> @@ -14,6 +14,7 @@
>>   #include <linux/dma-mapping.h>
>>   #include <linux/io.h>
>>   #include <linux/of_platform.h>
>> +#include <linux/phy/phy.h>
>>   #include <linux/pm_runtime.h>
>>   
>>   /* USBSS register offsets */
>> @@ -34,6 +35,7 @@
>>   struct dwc3_keystone {
>>   	struct device			*dev;
>>   	void __iomem			*usbss;
>> +	struct phy			*usb3_phy;
>>   };
>>   
>>   static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
>> @@ -95,8 +97,44 @@ static int kdwc3_probe(struct platform_device *pdev)
>>   	if (IS_ERR(kdwc->usbss))
>>   		return PTR_ERR(kdwc->usbss);
>>   
>> -	pm_runtime_enable(kdwc->dev);
>> +	/* PSC dependency on AM65 needs SERDES0 to be powered before USB0 */
>> +	kdwc->usb3_phy = devm_phy_get(dev, "usb3-phy");
> Use devm_phy_optional_get() instead?

Indeed, it seems better suited.

cheers,
-roger

> 
>> +	if (IS_ERR(kdwc->usb3_phy)) {
>> +		error = PTR_ERR(kdwc->usb3_phy);
>> +		if (error == -ENOSYS || error == -ENODEV) {
>> +			kdwc->usb3_phy = NULL;
>> +		} else {
>> +			if (error != -EPROBE_DEFER) {
>> +				dev_err(dev, "couldn't get usb3 phy: %d\n",
>> +					error);
>> +			}
>> +
>> +			return error;
>> +		}
>> +	}
>> +
>> +	phy_pm_runtime_get_sync(kdwc->usb3_phy);
>> +
>> +	error = phy_reset(kdwc->usb3_phy);
>> +	if (error < 0) {
>> +		dev_err(dev, "usb3 phy reset failed: %d\n", error);
>> +		return error;
>> +	}
>> +
>> +	error = phy_init(kdwc->usb3_phy);
>> +	if (error < 0) {
>> +		dev_err(dev, "usb3 phy init failed: %d\n", error);
>> +		return error;
>> +	}
>>   
>> +	error = phy_power_on(kdwc->usb3_phy);
>> +	if (error < 0) {
>> +		dev_err(dev, "usb3 phy power on failed: %d\n", error);
>> +		phy_exit(kdwc->usb3_phy);
>> +		return error;
>> +	}
>> +
>> +	pm_runtime_enable(kdwc->dev);
>>   	error = pm_runtime_get_sync(kdwc->dev);
>>   	if (error < 0) {
>>   		dev_err(kdwc->dev, "pm_runtime_get_sync failed, error %d\n",
>> @@ -138,6 +176,9 @@ static int kdwc3_probe(struct platform_device *pdev)
>>   err_irq:
>>   	pm_runtime_put_sync(kdwc->dev);
>>   	pm_runtime_disable(kdwc->dev);
>> +	phy_power_off(kdwc->usb3_phy);
>> +	phy_exit(kdwc->usb3_phy);
>> +	phy_pm_runtime_put_sync(kdwc->usb3_phy);
>>   
>>   	return error;
>>   }
>> @@ -163,6 +204,10 @@ static int kdwc3_remove(struct platform_device *pdev)
>>   	pm_runtime_put_sync(kdwc->dev);
>>   	pm_runtime_disable(kdwc->dev);
>>   
>> +	phy_power_off(kdwc->usb3_phy);
>> +	phy_exit(kdwc->usb3_phy);
>> +	phy_pm_runtime_put_sync(kdwc->usb3_phy);
>> +
>>   	platform_set_drvdata(pdev, NULL);
>>   
>>   	return 0;
> 

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