linux-kernel - RE: [PATCH v1 2/2] usb:cdns3 Add Cadence USB3 DRD Driver

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Date:   Mon, 17 Dec 2018 11:25:58 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Felipe Balbi <balbi@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Kishon Vijay Abraham I <kishon@...com>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "rogerq@...com" <rogerq@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alan Douglas <adouglas@...ence.com>,
        "jbergsagel@...com" <jbergsagel@...com>,
        "nsekhar@...com" <nsekhar@...com>, "nm@...com" <nm@...com>,
        Suresh Punnoose <sureshp@...ence.com>,
        "peter.chen@....com" <peter.chen@....com>,
        Pawel Jez <pjez@...ence.com>, Rahul Kumar <kurahul@...ence.com>
Subject: RE: [PATCH v1 2/2] usb:cdns3 Add Cadence USB3 DRD Driver

Hi Felipe
>
>Pawel Laszczak <pawell@...ence.com> writes:
><snip>
>
>>>> +	case USB_REQ_SET_ISOCH_DELAY:
>>>> +		sprintf(str, "Set Isochronous Delay Delay: %d ns", wValue);
>>>> +		break;
>>>> +	default:
>>>> +		sprintf(str,
>>>> +			"SETUP BRT: %02x BR: %02x V: %04x I: %04x L: %04x\n",
>>>> +			bRequestType, bRequest,
>>>> +			wValue, wIndex, wLength);
>>>> +	}
>>>> +
>>>> +	return str;
>>>> +}
>>>
>>>All of these are a flat out copy of dwc3's implementation. It's much,
>>>much better to turn dwc3's implementation into a generic, reusable
>>>library function then spinning your own as a duplicated effort.
>> I agree,
>> It would be nice to have a set of decoding function  in some generic library. It could be used
>> also by other drivers.
>> Who should do this ?
>
>since you're the first to reuse it, then it should be you :-)

So I can prepare debug.h  in drivers/usb/gadget directory. 

Function form drivers/usb/dwc3/debug.h that could be common are: 

static inline void dwc3_decode_get_status(__u8 t, __u16 i, __u16 l, char *str)
static inline void dwc3_decode_get_set_descriptor(__u8 t, __u8 b, __u16 v,
						  __u16 i, __u16 l, char *str)
static inline void dwc3_decode_set_clear_feature(__u8 t, __u8 b, __u16 v, __u16 i, char *str)												
static inline void dwc3_decode_set_address(__u16 v, char *str)
static inline void dwc3_decode_get_set_descriptor(__u8 t, __u8 b, __u16 v, __u16 i, __u16 l, char *str)						  
static inline void dwc3_decode_get_configuration(__u16 l, char *str)
static inline void dwc3_decode_set_configuration(__u8 v, char *str)
static inline void dwc3_decode_get_intf(__u16 i, __u16 l, char *str)
static inline void dwc3_decode_set_intf(__u8 v, __u16 i, char *str)
static inline void dwc3_decode_synch_frame(__u16 i, __u16 l, char *str)
static inline const char *dwc3_decode_ctrl(char *str, __u8 bRequestType, __u8 bRequest, __u16 wValue, __u16 wIndex, __u16 wLength)

After changed it could looks like: 
static inline void usb_decode_get_status(__u8 bRequestType, __u16 wIndex, __u16 wLength, char *str)
static inline void usb _decode_get_set_descriptor(__u8 bRequestType, __u8 bRequest, __u16 wValue,
						  __u16 wIndex, __u16 wLength, char *str)
static inline void usb_decode_set_clear_feature(__u8 bRequestType, __u8 bRequest, __u16 wValue, __u16 wIndex, char *str)												
static inline void usb_decode_set_address(__u16 v, char *str)
static inline void usb_decode_get_set_descriptor(__u8 bRequestType, __u8 bRequest, __u16 wValue, __u16 wIndex, __u16 wLength, char *str)						  
static inline void usb_decode_get_configuration(__u16 wLength, char *str)
static inline void usb_decode_set_configuration(__u8 wValue, char *str)
static inline void usb_decode_get_intf(__u16 wIndex, __u16 wLength, char *str)
static inline void usb_decode_set_intf(__u8 wValue, __u16 wIndex, char *str)
static inline void usb_decode_synch_frame(__u16 wIndex, __u16 wLength, char *str)
static inline const char * usb _decode_ctrl(char *str, __u8 bRequestType, __u8 bRequest, __u16 wValue, __u16 wIndex, __u16 wLength)

Sorry but I prefer some more significant names :)

For me functions in drivers/usb/dwc3/debug.h looks ok, but I think that could be better to
add additional usb_decode_test_mode and usb_decode_device_feature and little simplify usb_decode_get_set_descriptor. 

What do you think about this?

One more question. 
Can I add drivers/usb/gadget/debug.h file  as part of my  set patches, or this should be done as separate, new patch ? 

Cheers,
Pawel