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From: Pawel Laszczak <pawell@cadence.com>
To: Joe Perches <joe@perches.com>,
	"felipe.balbi@linux.intel.com" <felipe.balbi@linux.intel.com>
Cc: "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
	"rogerq@ti.com" <rogerq@ti.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"jbergsagel@ti.com" <jbergsagel@ti.com>,
	"nsekhar@ti.com" <nsekhar@ti.com>, "nm@ti.com" <nm@ti.com>,
	Suresh Punnoose <sureshp@cadence.com>,
	Jayshri Dajiram Pawar <jpawar@cadence.com>,
	Rahul Kumar <kurahul@cadence.com>,
	Anil Joy Varughese <aniljoy@cadence.com>
Subject: RE: [PATCH v10 2/6] usb:common Separated decoding functions from dwc3 driver.
Date: Mon, 22 Jul 2019 10:06:38 +0000
Message-ID: <BYAPR07MB4709115020BE99B5EB34D232DDC40@BYAPR07MB4709.namprd07.prod.outlook.com> (raw)
In-Reply-To: <4d4a8a02e4ec7fad9213302d17a6acd17851d8da.camel@perches.com>

Hi,

>
>On Sun, 2019-07-21 at 19:32 +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:
>[]
>> diff --git a/drivers/usb/common/debug.c b/drivers/usb/common/debug.c
>[]
>> +static void usb_decode_set_clear_feature(__u8 bRequestType, __u8 bRequest,
>> +					 __u16 wValue, __u16 wIndex,
>> +					 char *str, size_t size)
>
>It's probably not necessary to use Hungarian
>when moving these functions into generic code.

In my opinion it's ok in this place. It's consistence with USB specification ch9 and with
https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/usb/ch9.h. (look at usb_ctrlrequest). 

>
>> +{
>> +	switch (bRequestType & USB_RECIP_MASK) {
>> +	case USB_RECIP_DEVICE:
>> +		snprintf(str, size, "%s Device Feature(%s%s)",
>> +			 bRequest == USB_REQ_CLEAR_FEATURE ? "Clear" : "Set",
>> +			 ({char *s;
>> +				switch (wValue) {
>> +				case USB_DEVICE_SELF_POWERED:
>> +					s = "Self Powered";
>> +					break;
>> +				case USB_DEVICE_REMOTE_WAKEUP:
>> +					s = "Remote Wakeup";
>> +					break;
>> +				case USB_DEVICE_TEST_MODE:
>> +					s = "Test Mode";
>> +					break;
>> +				case USB_DEVICE_U1_ENABLE:
>> +					s = "U1 Enable";
>> +					break;
>> +				case USB_DEVICE_U2_ENABLE:
>> +					s = "U2 Enable";
>> +					break;
>> +				case USB_DEVICE_LTM_ENABLE:
>> +					s = "LTM Enable";
>> +					break;
>> +				default:
>> +					s = "UNKNOWN";
>> +				} s; }),
>> +			 wValue == USB_DEVICE_TEST_MODE ?
>> +			 ({ char *s;
>> +				switch (wIndex) {
>> +				case TEST_J:
>> +					s = ": TEST_J";
>> +					break;
>> +				case TEST_K:
>> +					s = ": TEST_K";
>> +					break;
>> +				case TEST_SE0_NAK:
>> +					s = ": TEST_SE0_NAK";
>> +					break;
>> +				case TEST_PACKET:
>> +					s = ": TEST_PACKET";
>> +					break;
>> +				case TEST_FORCE_EN:
>> +					s = ": TEST_FORCE_EN";
>> +					break;
>> +				default:
>> +					s = ": UNKNOWN";
>> +				} s; }) : "");
>
>I always find this sort of embedded switch/case char *
>statement expressions difficult to read and think it's
>better to use separate lookup functions.
>

It has been changed in next patch in the series.

>I would much prefer something like:
>
>static const char *usb_device_mode_desc(u16 mode)
>{
>	switch (mode) {
>	case USB_DEVICE_SELF_POWERED:
>		return "Self Powered";
>	case USB_DEVICE_REMOTE_WAKEUP:
>		return "Remote Wakeup";
>	case USB_DEVICE_TEST_MODE:
>		return "Test Mode";
>	case USB_DEVICE_U1_ENABLE:
>		return "U1 Enable";
>	case USB_DEVICE_U2_ENABLE:
>		return "U2 Enable";
>	case USB_DEVICE_LTM_ENABLE:
>		return "LTM Enable";
>	}
>	return "UNKNOWN";
>}
>
>		snprintf(str, size, "%s Device Feature(%s%s)",
>> 			 bRequest == USB_REQ_CLEAR_FEATURE ? "Clear" : "Set",
>			 usb_device_mode_desc(wValue),
>			 etc...);
>
>
>etc...
>
Cheers,
Pawell



  parent reply index

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-21 18:32 [PATCH v10 0/6] Introduced new Cadence USBSS DRD Driver Pawel Laszczak
2019-07-21 18:32 ` [PATCH v10 1/6] dt-bindings: add binding for USBSS-DRD controller Pawel Laszczak
2019-07-21 18:32 ` [PATCH v10 2/6] usb:common Separated decoding functions from dwc3 driver Pawel Laszczak
2019-07-21 19:05   ` Joe Perches
2019-07-21 20:45     ` Alan Stern
2019-07-21 20:54       ` Joe Perches
2019-07-22 10:06     ` Pawel Laszczak [this message]
2019-07-22 11:49       ` gregkh
2019-07-21 18:32 ` [PATCH v10 3/6] usb:common Patch simplify usb_decode_set_clear_feature function Pawel Laszczak
2019-07-21 19:07   ` Joe Perches
2019-07-22 10:12     ` Pawel Laszczak
2019-07-21 18:32 ` [PATCH v10 4/6] usb:common Simplify usb_decode_get_set_descriptor function Pawel Laszczak
2019-07-21 18:32 ` [PATCH v10 5/6] usb:cdns3 Add Cadence USB3 DRD Driver Pawel Laszczak
2019-07-31  3:36   ` Pawel Laszczak
2019-08-07 12:08   ` Roger Quadros
2019-08-11 11:59     ` Pawel Laszczak
2019-08-12  8:45       ` Roger Quadros
2019-08-12  9:43         ` Pawel Laszczak
2019-08-12 10:31           ` Heikki Krogerus
2019-08-12 11:05             ` Roger Quadros
2019-08-12 12:46               ` Felipe Balbi
2019-08-12 13:04                 ` Roger Quadros
2019-08-13  5:15                   ` Felipe Balbi
2019-08-13  7:30                   ` Chunfeng Yun
2019-08-13  7:48                     ` Roger Quadros
2019-08-13  8:50                       ` Chunfeng Yun
2019-08-12 10:05       ` Roger Quadros
2019-08-12 11:10         ` Pawel Laszczak
2019-08-14 13:32   ` Roger Quadros
2019-08-15  6:10     ` Felipe Balbi
2019-08-19  8:20     ` Pawel Laszczak
2019-08-14 13:38   ` Roger Quadros
2019-08-14 14:30     ` Pawel Laszczak
2019-08-15 11:22   ` Roger Quadros
2019-08-19 10:30     ` Pawel Laszczak
2019-08-19 10:59       ` Roger Quadros
2019-08-23  8:53   ` Vignesh Raghavendra
2019-08-23  9:39     ` Pawel Laszczak
2019-08-26  2:16   ` Peter Chen
2019-08-26  7:53     ` Pawel Laszczak
2019-07-21 18:32 ` [PATCH v10 6/6] usb:cdns3 Fix for stuck packets in on-chip OUT buffer Pawel Laszczak
2019-07-21 19:03 ` [PATCH v10 0/6] Introduced new Cadence USBSS DRD Driver Pavel Machek
2019-07-22  9:58   ` Pawel Laszczak
2019-07-22 11:48     ` gregkh
2019-07-22 11:56       ` Pavel Machek
2019-07-22 12:11         ` gregkh
2019-07-22 12:11         ` Pawel Laszczak
2019-07-22 21:00         ` Pavel Machek
2019-07-23  4:32           ` Pawel Laszczak
2019-08-07 11:05             ` Roger Quadros
2019-08-08  4:12               ` Pawel Laszczak
2019-08-09 10:36                 ` Roger Quadros
2019-08-09 10:44                   ` Felipe Balbi
2019-08-13  8:22                 ` Pavel Machek
2019-08-15 12:12 ` Roger Quadros
2019-08-15 14:39   ` Alan Stern
2019-08-19 12:08     ` Roger Quadros
2019-08-19 14:19       ` Alan Stern
2019-08-21  9:54         ` Roger Quadros

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