linux-kernel - RE: [PATCH v7 2/6] usb:common Separated decoding functions from dwc3 driver.

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Date:   Mon, 10 Jun 2019 06:29:24 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "felipe.balbi@...ux.intel.com" <felipe.balbi@...ux.intel.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "heikki.krogerus@...ux.intel.com" <heikki.krogerus@...ux.intel.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "rogerq@...com" <rogerq@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jbergsagel@...com" <jbergsagel@...com>,
        "nsekhar@...com" <nsekhar@...com>, "nm@...com" <nm@...com>,
        Suresh Punnoose <sureshp@...ence.com>,
        "peter.chen@....com" <peter.chen@....com>,
        Jayshri Dajiram Pawar <jpawar@...ence.com>,
        Rahul Kumar <kurahul@...ence.com>
Subject: RE: [PATCH v7 2/6] usb:common Separated decoding functions from dwc3
 driver.


>On Wed, Jun 05, 2019 at 11:03:46AM +0100, Pawel Laszczak wrote:
>
>> Patch moves some decoding functions from driver/usb/dwc3/debug.h driver
>
>> to driver/usb/common/debug.c file. These moved functions include:
>
>>     dwc3_decode_get_status
>
>>     dwc3_decode_set_clear_feature
>
>>     dwc3_decode_set_address
>
>>     dwc3_decode_get_set_descriptor
>
>>     dwc3_decode_get_configuration
>
>>     dwc3_decode_set_configuration
>
>>     dwc3_decode_get_intf
>
>>     dwc3_decode_set_intf
>
>>     dwc3_decode_synch_frame
>
>>     dwc3_decode_set_sel
>
>>     dwc3_decode_set_isoch_delay
>
>>     dwc3_decode_ctrl
>
>>
>
>> These functions are used also in inroduced cdns3 driver.
>
>>
>
>> All functions prefixes were changed from dwc3 to usb.
>
>> Also, function's parameters has been extended according to the name
>
>> of fields in standard SETUP packet.
>
>> Additionally, patch adds usb_decode_ctrl function to
>
>> include/linux/usb/ch9.h file.i
>
>>
>
>> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
>
>> ---
>
>>  drivers/usb/common/Makefile |   2 +-
>
>>  drivers/usb/common/debug.c  | 273 ++++++++++++++++++++++++++++++++++++
>
>>  drivers/usb/dwc3/debug.h    | 252 ---------------------------------
>
>>  drivers/usb/dwc3/trace.h    |   2 +-
>
>>  include/linux/usb/ch9.h     |  25 ++++
>
>>  5 files changed, 300 insertions(+), 254 deletions(-)
>
>>  create mode 100644 drivers/usb/common/debug.c
>
>>
>
>> diff --git a/drivers/usb/common/Makefile b/drivers/usb/common/Makefile
>
>> index 0a7c45e85481..02eb01666289 100644
>
>> --- a/drivers/usb/common/Makefile
>
>> +++ b/drivers/usb/common/Makefile
>
>> @@ -4,7 +4,7 @@
>
>>  #
>
>>
>
>>  obj-$(CONFIG_USB_COMMON)	  += usb-common.o
>
>> -usb-common-y			  += common.o
>
>> +usb-common-y			  += common.o debug.o
>
>>  usb-common-$(CONFIG_USB_LED_TRIG) += led.o
>
>>
>
>>  obj-$(CONFIG_USB_OTG_FSM) += usb-otg-fsm.o
>
>> diff --git a/drivers/usb/common/debug.c b/drivers/usb/common/debug.c
>
>> new file mode 100644
>
>> index 000000000000..f7218d794aa6
>
>> --- /dev/null
>
>> +++ b/drivers/usb/common/debug.c
>
>> @@ -0,0 +1,273 @@
>
>> +// SPDX-License-Identifier: GPL-2.0
>
>> +/**
>
>> + * Common USB debugging functions
>
>> + *
>
>> + * Copyright (C) 2010-2011 Texas Instruments Incorporated - https://urldefense.proofpoint.com/v2/url?u=http-
>3A__www.ti.com&d=DwIBAg&c=aUq983L2pue2FqKFoP6PGHMJQyoJ7kl3s3GZ-_haXqY&r=e1OgxfvkL0qo9XO6fX1gscva-
>w03uSYC1nIyxl89-rI&m=hCAftKt20FnC6KiCwNbVrg7WoY-WnCtUjVuast3iJSw&s=Q4qhFXl4s1P2u0s65WgkulIRgV4KZtGphj7Xjr4t6yA&e=
>
>> + *
>
>> + * Authors: Felipe Balbi <balbi@...com>,
>
>> + *	    Sebastian Andrzej Siewior <bigeasy@...utronix.de>
>
>> + */
>
>> +
>
>> +#ifndef __LINUX_USB_COMMON_DEBUG
>
>> +#define __LINUX_USB_COMMON_DEBUG
>
>
>
>Why are you doing thsi in a .c file?
>
Good question, I don't know :). 
Was removed 

Also I remember that you complained about placing it in 
drivers/usb/common. 
Currently this file is used only by two drivers dwc3 and cdns3.
Both are USB controller drivers. Maybe it could be better to move it to:
drivers/gadget/udc/debug.c
drivers/gadget/debug.c 
drivers/gadget/common/debug.c
or
drivers/gadget/debug/debug.c 

What do you think Roger? 

Felipe it's also question for you. 
 

Thanks,
Pawel

>
>
>thanks,
>
>
>
>greg k-h