Re: [PATCH] usb: dwc3: core: Don't try to get PHYs during suspend/resume

[Roger Quadros]

Felipe,

On 10/01/18 15:11, Roger Quadros wrote:
> The USB PHYs should be requested only once during the life cycle of
> this driver.
> 
> As dwc3_core_init() is called during system suspend/resume
> it will result in multiple calls to dwc3_core_get_phy() which is wrong.
> 
> To prevent that let's move dwc3_core_get_phy() call
> outside dwc3_core_init().
> 
> Fixes: 541768b08a4 ("usb: dwc3: core: Call dwc3_core_get_phy() before initializing phys")
> Cc: linux-stable <stable@xxxxxxxxxxxxxxx> # >= v4.13
> Signed-off-by: Roger Quadros <rogerq@xxxxxx>

FYI. this patch brings the code back to
revert 541768b08a40	("usb: dwc3: core: Call dwc3_core_get_phy() before initializing phys")
revert f54edb539c11	("usb: dwc3: core: initialize ULPI before trying to get the PHY")

So looks like this will break ULPI PHY case?

Where do we initialize ULPI PHY, in dwc3_phy_setup()?

if so then 541768b08a40 breaks the ULPI PHY case as well, right?

> ---
>  drivers/usb/dwc3/core.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 0783250..1274251 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -722,8 +722,6 @@ static void dwc3_core_setup_global_control(struct dwc3 *dwc)
>  	dwc3_writel(dwc->regs, DWC3_GCTL, reg);
>  }
>  
> -static int dwc3_core_get_phy(struct dwc3 *dwc);
> -
>  /**
>   * dwc3_core_init - Low-level initialization of DWC3 Core
>   * @dwc: Pointer to our controller context structure
> @@ -754,10 +752,6 @@ static int dwc3_core_init(struct dwc3 *dwc)
>  			dwc->maximum_speed = USB_SPEED_HIGH;
>  	}
>  
> -	ret = dwc3_core_get_phy(dwc);
> -	if (ret)
> -		goto err0;
> -
>  	ret = dwc3_core_soft_reset(dwc);
>  	if (ret)
>  		goto err0;
> @@ -1177,6 +1171,10 @@ static int dwc3_probe(struct platform_device *pdev)
>  	platform_set_drvdata(pdev, dwc);
>  	dwc3_cache_hwparams(dwc);
>  
> +	ret = dwc3_core_get_phy(dwc);
> +	if (ret)
> +		goto err0;
> +
>  	spin_lock_init(&dwc->lock);
>  
>  	pm_runtime_set_active(dev);
> 

-- 
cheers,
-roger

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