linux-kernel - Re: [PATCH] usb: dwc3: dwc3-am62: Re-initialize controller if lost power in PM suspend

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Message-ID: <1abbedd9-f34d-40be-9d3f-f33fcd012cb3@kernel.org>
Date: Wed, 27 Nov 2024 16:35:19 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Siddharth Vadapalli <s-vadapalli@...com>, "srk@...com" <srk@...com>,
 "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: dwc3: dwc3-am62: Re-initialize controller if lost
 power in PM suspend

Hi Thinh,

On 27/11/2024 00:15, Thinh Nguyen wrote:
> On Mon, Nov 25, 2024, Roger Quadros wrote:
>>
>>
>> On 25/11/2024 20:23, Thinh Nguyen wrote:
>>> On Fri, Nov 22, 2024, Roger Quadros wrote:
>>>> If controller looses power during PM suspend then re-initialize
>>>> it. We use the DEBUG_CFG register to track if controller lost power
>>>> or was reset in PM suspend.
>>>>
>>>> Move all initialization code into dwc3_ti_init() so it can be re-used.
>>>>
>>>> Signed-off-by: Roger Quadros <rogerq@...nel.org>
>>>> ---
>>>>  drivers/usb/dwc3/dwc3-am62.c | 82 +++++++++++++++++++++++++++++---------------
>>>>  1 file changed, 55 insertions(+), 27 deletions(-)
>>>>
>>>> diff --git a/drivers/usb/dwc3/dwc3-am62.c b/drivers/usb/dwc3/dwc3-am62.c
>>>> index fad151e78fd6..2192222faf4f 100644
>>>> --- a/drivers/usb/dwc3/dwc3-am62.c
>>>> +++ b/drivers/usb/dwc3/dwc3-am62.c
>>>> @@ -108,6 +108,9 @@
>>>>  
>>>>  #define DWC3_AM62_AUTOSUSPEND_DELAY	100
>>>>  
>>>> +#define USBSS_DEBUG_CFG_OFF		0x7
>>>> +#define USBSS_DEBUG_CFG_DISABLED	0x7
>>>
>>> Do we need 2 different macros with the same value of the same register
>>> for this?
>>
>> Oops. This is a mistake. The second one should be 0.
>>
> 
> Ok. Please send a fix.

Yes I will send a v2.

I have a query regarding this. Even though we restore the USB wrapper context
the XHCI driver still complains with below message.

[   68.235111] xhci-hcd xhci-hcd.0.auto: xHC error in resume, USBSTS 0x401, Reinit

Clearly the Save/restore failed and so SRE bit is set.
Is this something to be concerned about or needs addressing?

the host controller functions fine as it is re-initialized by the
XHCI driver.

-- 
cheers,
-roger